AS1375-BTDT-33 - Austriamicrosystems

AS1375

1µA Quiescent Current, 200mA LDO

www.austriamicrosystems.com/LDOs/AS1375 Revision 1.02 1 - 10

Datasheet

1 General Description

The AS1375 low-power, positive voltage regulator is

designed to deliver up to 200mA, while cons uming only

1µA (typ.) of quiescent current. The device is available

in fixed output voltages between 1.2V and 5.0V

(programmable in 50mV steps). The input voltage

ranges from 2V to 5.5V. Operation with large input to

output differential voltages is limited by the maximum

power dissipation available from package and

environment.

The very-low dropout voltage prolongs battery life and

allows high current in small applicati ons when operated

with minimum input-to-output voltage differentials. The

device features very stable output voltage, strict output

voltage regulation tolerances (±1%), and excellent line-

and load-regulation.

The device features integrated short-circuit and over

current protection. Under-Voltage lockout prevents

erratic operation when the input voltage is slowly

decaying. Thermal Protection shuts down the device

when die temperature reaches 160°C. This is a useful

protection when the device is under sustained short

circuit conditions.

The AS1375 is available in an 6-pin TDFN 2x2mm

package and is qualified for -40°C to +85°C operation.

2 Key Features

! Input Voltage: 2V to 5.5V

! Low Dropout V oltage: 120mV @ 200mA load

! Output Vo ltage Range: 1.2V to 5.0V (50mV steps)

! Max. Output Current: 200mA

! Very Low Quiescent Current: 1µA

! Output Vo ltage Accuracy: ±1%

! Low Shutdown Current: 10nA (typ.)

! Integrated Overtemperature/Overcurrent Protection

! Under-Voltage Lockout Feature

! Enable Input

! Minimal External Components Required

! Operating Temperature Range: -40°C to +85°C

! 6-pin TDFN 2x2mm Package

3 Applications

The device is perfectly suited for wireless handsets,

smartphones, PDAs, MP3 players, and other battery-

operated handheld devices, where the regulators have

to be always on.

Figure 1. AS1375 - Typical Application Diagram

Input

2V to 5.5V

CIN

1µF

ON /

OFF

COUT

1µF

Output

1.2V to 5V

EN GND

OUT

AS1375

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AS1375

Datasheet - Pin A s s i g n m e n t s

4 Pin Assignments

Figure 2. Pin Assignments (Top View)

Pin Descriptions

Table 1. Pin Descriptions

Pin Name Pin Number Description

IN 1Input Supply

EN 3Enable Input. A logic low disables the regulator. Connect to pin IN for

normal operation.

GND 2, 4, 5 Ground

OUT 6Regulate d Output Voltage. Current flowing out of this pin is equivalent DC

load current.

Exposed Pad 7Ground. This pin also functions as a heat sink. Solder to a large pad or the

circuit-board ground plane to maximize power dissipation.

3EN

2GND

1IN 6OUT

AS1375 5GND

4GND

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AS1375

Datasheet - Ab so lu te Ma xi mu m Ratin gs

5 Absolute Maximum Ratings

Stresses beyond those listed in Table 2 may cause permanent damage to the device. These are stress ratings only,

and functional op eration of the device at these or any other conditions beyond those in dicated in Section 6 Electrical

Characteristics on page 4 is not implied. Exposure to absolute maximum rating conditions for extended periods may

affect device reliability.

Table 2. Absolute Maximum Ratings

Parameter Min Max Units Notes

Input Voltage +7 V

Output Short-Circuit Duration Indefinite V

Electrostatic Discharge 2 kV HBM MIL-Std. 883E 3015.7 method s

Latch-Up 100 mA @85°C, JEDEC 78

Thermal Resistance θJA +140 ºC/W

Junction Temperature +150 ºC Internally limited

Operating Temperature Range -40 +85 ºC

Storage Temperature Range -65 +150 ºC

Package Body Temperature +260 ºC

The reflow peak soldering temperature

(body temperature) specified is in

accordance with IPC/JEDEC J-STD-

020D “Moisture/Reflow Sensitivity

Classification for Non-Hermetic So lid

State Surfa c e Mo un t D ev ice s”.

The lead finish for Pb-free leaded

packages is matte tin (100% Sn).

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AS1375

Datasheet - Ele c t r i c a l C h a r a c t e r i s t i c s

6 Electrical Characteristics

VIN = VOUT + 500mV or VIN = +2V (whichever is greater),CIN = COUT = 1µF, EN = IN, TAMB = -40°C to +85ºC (unless

otherwise specified). Typical values are at TAMB = +25ºC.

Table 3. Electrical Characte ristics

Symbol Parameter Condition Min Typ Max Unit

VIN Input Voltage 2 5.5 V

Output Voltage Accuracy

IOUT = 10mA -1 +1 %

IOUT = 1 to 200mA, VOUT > 1.5V 1

1. Guaranteed by production test of load regu lation.

-1.5 +1.5 %

IOUT = 1 to 200mA, VOUT < 1.5V1-2 +2 %

VOUT Output Voltage Range 1.2 5.0 V

IOUT Guaranteed Output Current

(RMS) 200 mA

ILIMIT Short-Circuit Current Limit VOUT = 0 250 330 450 mA

In-Regulation Current Limit VOUT > 96% of nominal value 330 mA

IQGround-Pin Current

IOUT = 0 1.2 2

µAIOUT = 100µA 1

IOUT = 200mA 1.7

VIN -

VOUT Dropout Voltage2

2. Dropout voltage is defined as VIN - VOUT, when VOUT is 100mV below the value of VOUT measured for VIN =

(VOUT(NOM) + 500mV). Since the minimum input voltage is 2V, this specification is only valid when VOUT(NOM) >

2V.

IOUT = 200mA, VOUT ≥ 2.8V 120 200 mV

IOUT = 200mA, 2V < VOUT < 2.8V 170 350

ΔVLNR Line Regulation VIN from (VOUT + 500mV) to 5.5V,

ILOAD = 10mA -0.125 +0.125 %/V

ΔVLDR Load Regulation IOUT = 1mA to 200mA 0.003 %/mA

Shutdown

IOFF Shutdown Supply Current EN = GND 10 100 nA

VIH EN Input Threshold 2V < VIN < 5. 5V 1.2 V

VIL 2V < VIN < 5. 5V 0.4 V

IEN EN Input Bias Current EN = IN or GND 1 403

3. Guaranteed by design.

Note: All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or

SQC (Statistical Quality Control) methods.

Startup Time from EN to 90% of VOUT(NOM) 750 µs

Shutdown Time from EN to 10% of VOUT(NOM) 500

Thermal Protection

TSHDNN Thermal Shutdown

Temperature 160 ºC

ΔTSHDNN Thermal Shutdo w n Hyst ere si s 20 ºC

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AS1375

Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s

7 Typical Operating Characteristics

VIN = 3.5V, VOUT = 3.0V, TAMB = +25°C (unless otherwise specified).

Figure 3. Line Regulation Figure 4. Load Regulation

2.95

2.975

3.025

3.05

3.5 3.75 4 4.25 4.5 4.75 5 5.25 5.5

I n put Volt ag e ( V)

Out put Voltage ( V )

Iou t = 0.1mA

Iou t = 10mA

Iou t 0 100mA

Iout = 200mA 2.95

2.975

3.025

3.05

0 25 50 75 100 125 150 175 200

Output Current (mA )

Out put Voltage ( V )

Figure 5. Ground Pin Current vs. Output Current Figure 6. Ground Pin Current vs. Input Voltage

1.25

1.5

1.75

2.25

2.5

0 25 50 75 100 125 150 175 200

Output Current (mA)

Ground Pi n Cur r ent (µ A )

1.25

1.5

1.75

2.25

2.5

3.5 3.75 4 4.25 4.5 4.75 5 5.25 5.5

Input Volt age ( V)

Ground Pi n Cur r ent (µ A )

Iou t = 0.1mA

Iou t = 100m A

Iout = 200mA

Figure 7. Output Voltage vs. Input Voltage - Dropout

2.9

2.92

2.94

2.96

2.98

3.02

3.04

3.06

2.9 3 3.1 3.2 3.3 3.4 3.5

Input Volt age ( V)

Out put Voltage ( V )

Iload = 100mA

Iload = 200mA

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AS1375

Datasheet - D et a i l e d De s c r i p t i o n

8 Detailed Description

The AS1375 is an low-power and low-quiescent current linear-regulator specifically designed for space-limited applica-

tions. These device can supply loads up to 200mA. As shown in Figure 8, the AS1375 consist of an integrated voltage

reference, error amplifier, P-channel MOSFET pass transistor.

Additional blocks include a current limiter, thermal sensor, and enable logic.

Internal Voltage Reference

The bandgap reference is connected to the error amplifier’ s inverting input. The error amplifier compares this reference

with the feedback voltage and amplifies the difference. If the feedback voltage is lower than the reference voltage, the

pass-transistor gate is pulled low. Th is allo ws more current to pass to the output and increases the output voltage. If

the feedback voltage is too high, the pass transistor gate is pulled high, allowing less current to pass to the output.

Figure 8. AS1375 - Block Diagram

Current Limit

The AS1375 include a current limiting circui try to monitor and control the P-ch annel MOSFET pass transistor’s gate

voltage, thus limiting the device output current to 300mA.

Note: See Table 3 on page 4 for the min and max current limits. The output can be shorted to ground indefinitely

without causing damage to the device.

Thermal Protection

Integrated thermal protection circuitry limits total power dissipation in the AS1375. When the junction temperature (TJ)

exceeds +160ºC, the thermal sensor signals the shutdown logic, turning off the P-channel MOSFET pass transistor

and allowing the device to cool down. The thermal sensor turns the pass transistor on again after the device’ s junction

temperature drops by 20ºC, resulting in a pulsed output during continuous thermal-overload conditions.

Note: Thermal pr otection i s designed to protect th e devices in the event of fault conditions. For continuous operation,

do not exceed the absolute maximum junction temperature rating of +150ºC.

GND

OUT

AS1375

Overcurrent

Protection

Voltage

and

Current Reference

Enable Con-

trol Logic

Thermal

Protection

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AS1375

Datasheet - App l i c a t i o n I n f o r m a t i o n

9 Application Information

Capacitor Selection and Regulator Stability

For normal operation, use a 1µF capacitor at pin IN and a 1µF capacitor at pin OUT. Larger input capacitor values and

lower ESR provide better noise rejection and line-transient response. Reduce output noise and improve load-transient

response, stability, and power-supply rejection by using la rge output capacitors.

Note: Some ceramic dielectrics exhibit large capacitance and ESR variation with temperature. Wi th dielectrics such

as Z5U and Y5V, it may be necessary to use a 2.2µF or larger output capacitor to ensure stability at tempera-

tures below -10°C. With X7R or X5R dielectrics, 1µF is sufficient at all operating temperatures.

Noise, PSRR, and Transient Response

The AS1375 is designed to deliver low dropout and low quiescent currents in battery-powered systems. The power-

supply rejection is 85dB at 1kHz and 50dB at 100kHz.

When operating from sources other than batteries, improved supp ly-noise rejection and transient response can be

achieved by increasing the values of the input and output capacitors, and through passive filtering techniques.

Dropout Voltage

The AS1375 minimum dropout voltage determines the lowest usable supply voltage. In battery-powered systems, this

determines the useful end-of-life battery voltage.

Since the AS1375 use a P-channel MOSFET pass transistor, the dropout voltage is a function of drain-to-source on-

resistance (RDS(ON)) multiplied by ILOAD.

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AS1375

Datasheet - Pa ck ag e D ra wings a nd Ma rk in gs

10 Package Drawings and Markings

The device is available in a 6-pin TDFN 2x2mm package.

Figure 9. 6-pin TDFN 2x2mm Package Diagram

Note:

1. All dimensions are in millimeters, angle is in degrees (°).

2. N is the total number of terminals.

3. The location of the terminal #1 identifier and terminal numbering convention conforms to JEDEC publication 95

SPP-002.

4. ND and NE refer to the number of terminals on ea ch D and E side respectively.

5. NJR refer to non jedec registered.

6. Dimension b applies to metallized terminal and is measured between 0.15mm and 0.30mm from the terminal

tip. If the terminal has the optional radius on the other end of the terminal, the dimension B should not be mea-

sured in that radius area.

7. Coplanarity applies to the terminals and all other bottom surface metallization.

Table 4. 4-bumps WL-CSP package Dimensions

Symbol Min Typ Max Symbol Min Typ Max

A 0.51 0.55 0.60 D BSC 1.95 2.00 2.05

A1 0.00 0.02 0.05 E BSC 1.95 2.00 2.05

A3 0.15 REF D2 1.30 1.45 1.55

b0.20 0.25 0.32 E2 0.85 1.00 1.10

e0.50 L 0.15 0.25 0.35

aaa 0.15 k 0.20

bbb 0.10 ND 3

ccc 0.10 N 6

D/2

E/2

aaa C

INDEX AREA

D/2 x E/2

TOP VIEW

SEATING

PLANE

SIDE V IEW

bbb C A B

INDEX AREA

(D/2 x E /2)

BOTTOM VIEW

eTerminal Tip

EXPOSED PAD

0.08 C

ccc C

PIN#1 ID

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AS1375

Datasheet - O r d e r i n g I n f o r m a t i o n

11 Ordering Information

The devices are available as the standard products shown in Table 5.

Non-standard devices from 1.2V to 5.0V are available in 50mV steps. For more informati on and inquiries contact

http://www.austriamicrosystems.com/contact

Note: All products are RoHS compliant.

Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect

Technical Support is found at http://www.austriamicrosystems.com/Technical-Support

For further information and requests, please contact us mailto:sales@austriamicrosystems.com

or find your local distributor at http://www.austriamicrosystems.com/distributor

Table 5. Ordering Information

Ordering Code Marking Output Description Delivery Form Package

AS1375-BTDT-12 ABD 1.2V 1µA Quiescent Current,