EN5337QI - ALTERA - Product.Network

02638 September 12, 2012 Rev: E

EN5337QI

3A Voltage Mode Synchronous Buck PWM

DC-DC Converter with Integrated Inductor

www.enpirion.com

Description

The EN5337QI is a Power Supply on a Chip

(PwrSoC) DC-DC converter. It integrates

MOSFET switches, all small-signal circuits,

compensation, and the inductor in an advanced

4mm x 7mm QFN package.

The EN5337QI is specifically designed to meet

the precise voltage and fast transient

requirements of present and future high-

performance, low-power processor, DSP, FPGA,

memory boards, and system level applications in

distributed power architectures. Advanced circuit

techniques, ultra high switching frequency, and

very advanced, high-density, integrated circuit

and proprietary inductor technology deliver high-

quality, ultra compact, non-isolated DC-DC

conversion.

The Enpirion solution significantly helps in

system design and productivity by offering greatly

simplified board design, layout and

manufacturing requirements. In addition, a

reduction in the number of vendors required for

the complete power solution helps to enable an

overall system cost savings.

All Enpirion products are RoHS compliant and

lead-free manufacturing environment compatible.

Figure 1: Total Solution Footprint (Not to scale)

Total Area ≈ 75 mm2

Features

• Integrated Inductor, MOSFETS, Controller

• Total Power Solution ≈ 75mm2

• Minimal external components.

• 3A Continuous Output Current Capability

• 5MHz operating frequency. Switching

frequency can be phase locked to an external

clock.

• High efficiency, up to 92%.

• Wide input voltage range of 2.375V to 5.5V.

• Output Enable pin and Power OK signal.

• Programmable soft-start time.

• Under Voltage Lockout, Over Current, Short

Circuit and Thermal Protection.

• RoHS compliant, MSL level 3, 260C reflow.

Applications

• Point of load regulation for low-power

processors, network processors, DSPs,

FPGAs, and ASICs

• Noise sensitive applications such as A/V, RF

and Gbit I/O

• Low voltage, distributed power architectures

with 2.5V, 3.3V or 5V rails

• Computing, Networking, DSL, STB, DVR,

DTV, iPC

• Ripple sensitive applications

• Beat frequency sensitive applications

OUT

47μF

1206

22μF

1206

VOUT

ENA

AGND

PVIN

AVIN

PGND

XFB

EN5337QI

Figure 2: Typical Application Schematic

EN5337QI

Output Cap

47uF/1206

0402

Input Cap

22uF/1206

RA 0402

CA 0402 RB 0402 Soft Start Cap

02638 September 12, 2012 Rev: E

EN5337QI

Ordering Information

Part Number

Temp Rating

(°C) Package

EN5337QI -40 to +85 38-pin QFN T&R

EN5337QI-E QFN Evaluation Board

Pin Assignments (Top View)

NC(SW)

VOUT

NC(SW)

PGND

PVIN

NC(SW)

AVIN

AGND

XFB

EAOUT

POK

ENABLE

SYNC

EN5337QI

38 37 36 35 34 33 28

30 26

2729

3132

78910

11 12 17

15 1913 14 16 18

PVIN

Figure 3: Pinout Diagram (Top View)

NOTE: All perimeter pins must be soldered to PCB.

Pin Description

PIN NAME FUNCTION

1-2, 12,

34-38 NC(SW)

NO CONNECT – These pins are internally connected to the common switching node of the

internal MOSFETs. They are not to be electrically connected to any external signal, ground,

or voltage. Failure to follow this guideline may result in damage to the device.

3-4,

22-25 NC

NO CONNECT – These pins may be internally connected. Do not connect them to each

other or to any other electrical signal. Failure to follow this guideline may result in device

damage.

5-11 VOUT

Regulated converter output. Connect these pins to the load, and place output capacitor

from these pins and PGND pins 13-15

13-18 PGND

Input/Output power ground. Connect these pins to the ground electrode of the Input and

output filter capacitors. See VOUT and PVIN pin descriptions for more details.

19-21 PVIN

Input power supply. Connect to input power supply. Decouple with input capacitor to

PGND pins 16-18.

26 SYNC External Clock Input to synchronize internal switching clock to an external signal

27 ENABLE

Input Enable. Applying logic high enables the output and initiates a soft-start. Applying a

logic low disables the output.

28 POK

Power OK is an open drain transistor for power system state indication. POK will be logic

high when VOUT is with -10% to +20% of VOUT nominal.

29 EAOUT Optional Error Amplifier output. Allows for customization of the control loop response.

30 SS

Soft-Start node. The soft-start capacitor is connected between this pin and AGND. The

value of this capacitor determines the startup time.

31 XFB

External Feedback Input. The feedback loop is closed through this pin. A voltage divider at

VOUT is used to set the output voltage. The mid point of the divider is connected to XFB. A

phase lead capacitor from this pin to VOUT is also required to stabilize the loop.

32 AGND

Analog Ground. This is the Ground return for the controller. Needs to be connected to a

quiet ground.

33 AVIN

Input power supply for the controller. Needs to be connected to input voltage at a quiet

point.

02638 September 12, 2012 Rev: E

EN5337QI

Absolute Maximum Ratings

CAUTION: Absolute Maximum ratings are stress ratings only. Functional operation beyond the

recommended operating conditions is not implied. Stress beyond the absolute maximum ratings may

impair device life. Exposure to absolute maximum rated conditions for extended periods may affect

device reliability.

PARAMETER SYMBOL MIN MAX UNITS

Voltages on PVIN, AVIN, VOUT VIN -0.5 6.0 V

Voltages on Enable, POK -0.5 VIN V

Voltages on XFB, EAOUT, SYNC, SS -0.5 2.5 V

Storage Temperature Range TSTG -65 150 °C

Maximum Operating Junction Temperature TJ-ABS Max 150 °C

Reflow Temp, 10 Sec, MSL3 JEDEC J-STD-020A 260 °C

ESD Rating – User pins (based on HBM) 2000 V

ESD Rating - NC pins (based on HBM) 1000 V

ESD Rating (based on CDM) 500 V

Recommended Operating Conditions

PARAMETER SYMBOL MIN MAX UNIT

Input Voltage Range VIN 2.375 5.5 V

Output Voltage Range VOUT 0.60 VIN – VDO

† V

Output Current ILOAD 0 3 A

Operating Junction Temperature TJ-OP - 40 125 °C

Operating Ambient Temperature TAMB - 40 85 °C

† VDO (drop-out voltage) is defined as (ILOAD x Dropout Resistance). Please see Electrical Characteristics table.

Thermal Characteristics

PARAMETER SYMBOL MIN TYP MAX UNITS

Thermal Shutdown TSD 150 °C

Thermal Shutdown Hysteresis TSDH 20 °C

Thermal Resistance: Junction to Ambient (Note 1) θJA 30 °C/W

Thermal Resistance: Junction to Case θJC 3 °C/W

Note 1: Based on a four layer copper board and proper thermal design in line with JEDEC EIJ/JESD51 standards

02638 September 12, 2012 Rev: E

EN5337QI

Electrical Characteristics

NOTE: VIN=5.5V over operating temperature range unless otherwise noted. Typical values are at TA = 25°C.

PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS

Operating Input Voltage VIN 2.375 5.5 V

Under Voltage Lock-out –

VIN Rising VUVLOR Voltage above which UVLO is not

asserted 2.2 V

Under Voltage Lock-out –

VIN Falling VUVLOF Voltage below which UVLO is

asserted 2.1 V

Shut-Down Supply Current IS ENABLE=0V 100

μA

Feedback Pin Voltage VXFB Feedback node voltage – factory

setting – TA = 25°C 0.735 0.75 0.765 V

Feedback pin Input

Leakage Current 1 IXFB XFB pin input leakage current -5 5 nA

Line Regulation ΔVOUT_LINE 2.375V ≤ VIN ≤ 5.5V 0.02 %/V

Load Regulation ΔVOUT_LOAD 0A ≤ ILOAD ≤ 3A -0.03 %/A

Temperature Regulation ΔVOUT_TEMP -40°C ≤ TEMP ≤ 85°C 0.003 %/°C

VOUT Rise Time tRISE

Measured from when VIN ≥ VUVLOR &

ENABLE pin voltage crosses logic

high threshold. (4.7nF ≤ CSS ≤ 100nF)

CSS X

67 kΩ

Rise Time Accuracy 1 ΔTRISE 4.7nF ≤ CSS ≤ 100nF -25 +25 %

Output Drop Out

Voltage

Resistance

VDO

RDO

VINMIN - VOUT at Full load

Input to Output Resistance

250

500

167

mΩ

Maximum Continuous

Output Current IOUT_Max_Cont 3 A

Over Current Trip Level IOCP 4.5 A

Disable Threshold VDISABLE ENABLE pin logic low. 0.0 0.8 V

ENABLE Threshold VENABLE ENABLE pin logic high

2.375V ≤ VIN ≤ 5.5V 1.8 VIN V

ENABLE Lock-out time TENLO Time for device to re-enable after a

falling edge on ENABLE pin 700 µS

ENABLE pin Input Current1 I

ENABLE ENABLE pin has ~80kΩ pull down 70

μA

Switching Frequency (Free

Running) FSW Free Running frequency of

oscillator 5 MHz

External SYNC Clock

Frequency Lock Range FPLL_LOCK Range of SYNC clock frequency 4.5 5.5 MHz

SYNC Input Threshold –

Low VSYNC_LO SYNC Clock Logic Level 0.8 V

SYNC Input Threshold –

High VSYNC_HI SYNC Clock Logic Level 1.8 2.5 V

POK Threshold POKTH Output voltage as a fraction of expected

output voltage 90 %

POK Output Low Voltage VPOKL With 4mA current sink into POK 0.4 V

POK Output Hi Voltage VPOKH 2.375V ≤ VIN ≤ 5.5V VIN V

POK pin VOH Leakage

Current1 IPOKL POK high 1 µA

Note 1: Parameter guaranteed by design

02638 September 12, 2012 Rev: E

EN5337QI

Typical Performance Characteristics

= 3.3V

00.511.522.53

Load (Amps)

Efficiency (%)

Efficiency VIN = 3.3V

VOUT (From top to bottom) = 2.5, 1.8, 1.2, 1.0, 0.75V

= 5V

0 0.5 1 1.5 2 2.5 3

Load (Amps)

Efficiency (%)

Efficiency VIN = 5.0V

VOUT (From top to bottom) = 3.3, 2.5, 1.8, 1.2, 1.0, 0.75V

Output Ripple: VIN = 3.3V, VOUT = 1.2V, Iout = 3A

CIN = 22μF, COUT = 47μF/1206 + 10uF/0805

Output Ripple: VIN = 3.3V, VOUT = 1.2V, Iout = 3A

CIN = 22μF, COUT = 47μF/1206 + 10uF/0805

Output Ripple: VIN = 5V, VOUT = 1.2V, Iout = 3A

CIN = 22μF, COUT = 47μF/1206 + 10uF/0805

Output Ripple: VIN = 5V, VOUT = 1.2V, Iout = 3A

CIN = 22μF, COUT = 47μF/1206 + 10uF/0805

20 MHz BW limit

500 MHz BW

02638 September 12, 2012 Rev: E

EN5337QI

Load Transient: VIN = 5.0V, VOUT = 1.2V

Ch.1: VOUT, Ch.4: ILOAD (slew rate ≥ 10A/µS)

CIN = 22μF, COUT ≈ 50μF

Load Transient: VIN = 3.3V, VOUT = 1.2V

Ch.1: VOUT, Ch.4: ILOAD (slew rate ≥ 10A/µS)

CIN = 22μF, COUT ≈ 50μF

Power Up/Down at No Load: VIN/VOUT = 5.0V/1.2V,

15nF soft-start capacitor,

Ch.1: ENABLE, Ch.3: VOUT, Ch.4; POK

Power Up/Down into 0.4Ω load: VIN/VOUT = 5.0V/1.2V,

15nF soft-start capacitor,

Ch.1: ENABLE, Ch.3: VOUT, Ch.4; POK

0.000

0.050

0.100

0.150

0.200

0.250

0.300

00.511.522.53

Load (Amps)

INMIN

- V

OUT

)

Drop-Out Voltage

Enable Lock-out Time,

Ch.1: ENABLE, Ch. 2: VOUT

02638 September 12, 2012 Rev: E

EN5337QI

Functional Block Diagram

(+)

(-)

Error

Amp

VOUT

P-Drive

N-Drive

UVLO

Thermal Limit

Current Limit

Soft Start

PLL / Sawtooth

Generator

(+)

(-)

PWM

Comp

PVIN

ENABLE

Compensation

Network

Voltage

Reference

PGND

XFB

EAOUT

Over Voltage

power

Good

Logic

POK

EAOUT

SYNC

EN5337QI

NC(SW)

AGND

Regulated

Voltage

AVIN

Figure 4: Functional Block Diagram

Functional Description

Synchronous Buck Converter

The EN5337QI is a synchronous,

programmable power supply with integrated

power MOSFET switches and integrated

inductor. The nominal input voltage range is

2.375V to 5.5V. The output voltage is

programmed using an external resistor divider

network. The control loop is voltage-mode with

a type III compensation network. Much of the

compensation circuitry is internal to the device.

However, a phase lead capacitor is required

along with the output voltage feedback resistor

divider to complete the type III compensation

network. The device uses a low-noise PWM

topology. Up to 3A of continuous output current

can be drawn from this converter. The 5MHz

switching frequency allows the use of small

size input / output capacitors, and realizes a

wide loop bandwidth within a small foot print.

Protection Features:

The power supply has the following protection

features:

• Over-current protection (to protect the IC

from excessive load current)

• Thermal shutdown with hysteresis.

• Under-voltage lockout circuit to disable the

converter output when the input voltage is

less than approximately 2.2V

Additional Features:

• The switching frequency can be phase-

locked to an external clock to eliminate or

move beat frequency tones out of band.

• Soft-start circuit, limiting the in-rush current

when the converter is initially powered up.

The soft start time is programmable with

appropriate choice of soft start capacitor

value.

02638 September 12, 2012 Rev: E

EN5337QI

• Power good circuit indicating the output

voltage is between 90% and 120% of

programmed value as long as the feedback

loop is closed.

Power-Up/Down Sequencing

During power-up, ENABLE should not be

asserted before PVIN, and PVIN should not be

asserted before AVIN. The PVIN should never

be powered when AVIN is off. During power

down, the AVIN should not be powered down

before the PVIN. Tying PVIN and AVIN or all

three pins (AVIN, PVIN, ENABLE) together

during power up or power down meets these

requirements.

Enable Operation

The ENABLE pin provides a means to enable

normal operation or to shut down the device.

Applying logic high will enable the converter

into normal operation. When the ENABLE pin

is asserted (high) the device will undergo a

normal soft start. A logic low will disable the

converter. A logic low will power down the

device in a controlled manner and the device is

subsequently shut down. The device will

remain shut-down for the duration of the

ENABLE lockout time (see Electrical

Characteristics Table). If the ENABLE signal is

re-asserted during this time, the device will

power up with a normal soft-start at the end of

the ENABLE lockout time.

Pre-Bias Start-up

The EN5337QI does not support startup into a

pre-biased condition. Be sure the output

capacitors are not charged or the output of the

EN5337QI is not pre-biased when the

EN5337QI is first enabled.

Frequency Synchronization

The switching frequency of the DC/DC

converter can be phase-locked to an external

clock source to move unwanted beat

frequencies out of band. To avail this feature,

the clock source should be connected to the

SYNC pin. An activity detector recognizes the

presence of an external clock signal and

automatically phase-locks the internal oscillator

to this external clock. Phase-lock will occur as

long as the input clock frequency is in the

range of 4.5 to 5.5 MHz. When no clock signal

is present, the device reverts to the free

running frequency of the internal oscillator.

Spread Spectrum Mode

The external clock frequency may be swept

between 4.5 MHz and 5.5 MHz at repetition

rates of up to 10 kHz in order to reduce EMI

frequency components.

Soft-Start Operation

Soft start is a means to reduce the in-rush

current when the device is enabled. The output

voltage is ramped up gradually upon start-up.

The output rise time is controlled by the choice

of soft-start capacitor, which is placed between

the SS pin (pin 30) and the AGND pin (pin 32).

Rise Time: TR ≈ (Css* 67kΩ) ± 25%

During start-up of the converter, the reference

voltage to the error amplifier is linearly

increased to its final level by an internal current

source of approximately 10uA. The soft start

capacitor should be between 4.7nF and 100nf.

Typical soft-start rise time is ~1mS with SS

capacitor value of 15nF. The rise time is

measured from when VIN ≥ V

UVLOR and

ENABLE pin voltage crosses its logic high

threshold to when VOUT reaches its

programmed value.

POK Operation

The POK signal is an open drain signal

(requires a pull up resistor to VIN or similar

voltage) from the converter indicating the

output voltage is within the specified range.

The POK signal will be logic high (VIN) when

the output voltage is above 90% of

programmed VOUT. If the output voltage goes

below this threshold, the POK signal will be at

logic low.

Over-Current Protection

The current limit function is achieved by

sensing the current flowing through the Power

PFET. When the sensed current exceeds the

over current trip point, both power FETs are

turned off for the remainder of the switching

cycle. If the over-current condition is removed,

02638 September 12, 2012 Rev: E

EN5337QI

the over-current protection circuit will enable

normal PWM operation. If the over-current

condition persists, the soft start capacitor will

gradually discharge causing the output voltage

to fall. When the OCP fault is removed, the

output voltage will ramp back up to the desired

voltage. This circuit is designed to provide high

noise immunity.

Thermal Overload Protection

Thermal shutdown circuit will disable device

operation when the Junction temperature

exceeds approximately 150ºC. After a thermal

shutdown event, when the junction

temperature drops by approx 20ºC, the

converter will re-start with a normal soft-start.

Input Under-Voltage Lock-Out

Internal circuits ensure that the converter will

not start switching until the input voltage is

above the specified minimum voltage.

Hysteresis, input de-glitch, and output leading

edge blanking ensure high noise immunity and

prevent false UVLO triggers.

Compensation

The EN5337QI uses a type 3 compensation

network. A piece of the compensation circuit is

the phase lead capacitor CA in Figure 5. This

network will provide wide loop bandwidth and

excellent transient performance for most

applications. It is optimized for use with about

50μF of output filter capacitance at the voltage

sensing point. Additional load decoupling

capacitance may be placed beyond the voltage

sensing point outside the control loop. Voltage

mode operation provides high noise immunity

at light load, and low output impedance.

In some applications modifications to the

compensation may be required. For more

information, contact Enpirion Applications

Engineering support.

Application Information

The EN5337QI output voltage is determined by

the voltage presented at the XFB pin. This

voltage is set by way of a resistor divider

between VOUT and AGND with the midpoint

going to XFB. A phase lead capacitor CA is

also required for stabilizing the loop. Figure 5

shows the required components and the

equations to calculate the values.

XFB

OUT

)75.0( *75.0

22,150

VVOUT RA

pFCAkRA

−

=Ω=

Figure 5: VOUT Resistor Divider Network and

Compensation Capacitor CA

Input Capacitor Selection

The EN5337QI requires between 10uF and

20uF of input capacitance. Low-cost, low-ESR

ceramic capacitors should be used as input

capacitors for this converter. The dielectric

must be X5R or X7R rated. Y5V or equivalent

dielectric formulations must not be used as

these lose too much capacitance with

frequency, temperature and bias voltage. In

some applications, lower value capacitors are

needed in parallel with the larger, capacitors in

order to provide high frequency decoupling.

Recommended Input Capacitors

Description MFG P/N

10uF, 10V, 10%

X7R, 1206

(1-2 capacitors needed)

Murata GRM31CR71A106KA01L

Taiyo Yuden LMK316B7106KL-T

22uF, 10V, 20%

X5R, 1206

(1 capacitor needed)

Murata GRM31CR61A226ME19L

Taiyo Yuden LMK316BJ226ML-T

Output Capacitor Selection

The EN5337QI has been optimized for use

with approximately 50μF of output filter

capacitance at the voltage sensing point

02638 September 12, 2012 Rev: E

EN5337QI

Additional load decoupling capacitance may be

placed beyond the voltage sensing point

outside the control loop. Low ESR ceramic

capacitors are required with X5R or X7R rated

dielectric formulation. Y5V or equivalent

dielectric formulations must not be used as

these lose too much capacitance with

frequency, temperature and bias voltage.

Output ripple voltage is determined by the

aggregate output capacitor impedance. Output

impedance, denoted as Z, is comprised of

effective series resistance, ESR, and effective

series inductance, ESL:

Z = ESR + ESL

Placing output capacitors in parallel reduces

the impedance and will hence result in lower

ripple voltage.

nTotal ZZZZ 1

...

111

+++=

Typical Ripple Voltages

Output Capacitor

Configuration

Typical Output Ripple (mVp-p)

(as measured on EN5335QI

Evaluation Board)

1 x 47 uF 30

47 uF + 10 uF 15

Recommended Output Capacitors

Description MFG P/N

47uF, 6.3V, 20%

X5R, 1206

(1 capacitor needed)

Murata GRM31CR60J476ME19L

Taiyo Yuden JMK212BJ476ML-T

10uF, 6.3V, 10%

X5R, 0805

(Optional 1 capacitor in

parallel with 47uF above)

Murata GRM21BR60J106KE19L

Taiyo Yuden JMK212BJ106KG-T

Power-Up Sequencing

During power-up, ENABLE should not be

asserted before PVIN, and PVIN should not be

asserted before AVIN. Tying all three pins

together meets these requirements.

Thermal Considerations

The Enpirion EN5337QI DC-DC converter is

packaged in a 7 x 4 x 1.85mm 38-pin QFN

package. The QFN package is constructed

with copper lead frames that have exposed

thermal pads. The recommended maximum

junction temperature for continuous operation

is 125°C. Continuous operation above 125°C

will reduce long-term reliability. The device has

a thermal overload protection circuit designed

to shut it off at an approximate junction

temperature value of 150°C.

The silicon is mounted on a copper thermal

pad that is exposed at the bottom of the

package. The thermal resistance from the

silicon to the exposed thermal pad is very low.

In order to take advantage of this low

resistance, the exposed thermal pad on the

package should be soldered directly on to a

copper ground pad on the printed circuit board

(PCB). The PCB then acts as a heat sink. In

order for the PCB to be an effective heat sink,

the device thermal pad should be coupled to

copper ground planes or special heat sink

structures designed into the PCB (refer to the

recommendations at the end of this note).

The junction temperature, TJ, is calculated from

the ambient temperature, TA, the device power

dissipation, PD, and the device junction-to-

ambient thermal resistance, θJA in °C/W::

TJ = TA + (PD)(θJA)

The junction temperature, TJ, can also be

expressed in terms of the device case

temperature, TC, and the device junction-to-

case thermal resistance, θJC in °C/W, as

follows:

02638 September 12, 2012 Rev: E

EN5337QI

TJ = TC + (PD)(θJC)

The device case temperature, TC, is the

temperature at the center of the exposed

thermal pad at the bottom of the package.

The device junction-to-ambient and junction-to-

case thermal resistances, θJA and θJC, are

shown in the Thermal Characteristics table on

page 3. The θJC is a function of the device and

the 38-pin QFN package design. The θJA is a

function of θJC and the user’s system design

parameters that include the thermal

effectiveness of the customer PCB and airflow.

The θJA value shown in the Thermal

Characteristics table on page 3 is for free

convection with the device heat sunk (through

the thermal pad) to a copper plated four-layer

PC board with a full ground and a full power

plane following JEDEC EIJ/JESD 51

Standards. The θJA can be reduced with the

use of forced air convection. Because of the

strong dependence on the thermal

effectiveness of the PCB and the system

design, the actual θJA value will be a function of

the specific application.

02638 September 12, 2012 Rev: E

EN5337QI

Design Considerations

Exposed Metal on Bottom of Package

Lead frames offers many advantages in

thermal performance, in reduced electrical lead

resistance, and in overall foot print. However,

they do require some special considerations.

In the assembly process lead frame

construction requires that, for mechanical

support, some of the lead-frame cantilevers be

exposed at the point where wire-bond or

internal passives are attached. This results in

several small pads being exposed on the

bottom of the package.

Only the large thermal pad and the perimeter

pads are to be mechanically or electrically

connected to the PC board. The PCB top layer

under the EN5337QI should be clear of any

metal except for the large thermal pad and the

perimeter pads. The “grayed-out” area in

Figure 6 represents the area that should be

clear of any metal (traces, vias, or planes), on

the top layer of the PCB.

Figure 6: Lead-Frame Exposed Metal (package bottom view). Grey area highlights exposed metal

below which there should not be any metal (traces, vias, or planes) on the top layer of PCB.

Recommended PCB Footprint

Figure 7: EN5337QI Package PCB Footprint

02638 September 12, 2012 Rev: E

EN5337QI

Package and Mechanical

Figure 8: EN5337QI Package Dimensions

Contact Information

Enpirion, Inc.

Perryville III

53 Frontage Road, Suite 210

Hampton, NJ 08827

USA

Phone: +1-908-894-6000

Fax: +1-908-894-6090

www.enpirion.com

Enpirion reserves the right to make changes in circuit design and/or specifications at any time without notice. Information furnished by Enpirion is

believed to be accurate and reliable. Enpirion assumes no responsibility for its use or for infringement of patents or other third party rights, which may

result from its use. Enpirion products are not authorized for use in nuclear control systems, as critical components in life support systems or equipment

used in hazardous environment without the express written authority from Enpirion.