ADP1715-100 - Analog Devices, Inc.

Rev. PrA | Page 1 of 9

500mA Low-Dropout Linear

Regulator in MSOP Package

Preliminary Technical Data ADP1715/ADP1716

FEATURES

16 Fixed Output Voltage Options from 0.75V to 3.3V

Adjustable Output Voltage from 0.8V to 5V

Wide 2.5V to 5.5V Input Voltage Range

Low Dropout Voltage:

 250 mV @500mA

±±

±1% Initial Accuracy

High PSRR (60dB @1kHz)

1µ

µµ

µA Shutdown Current

Adjustable Soft-Start Option Available

Output Voltage Tracking Option Available

Optimized for Small Ceramic Capacitors

Thermal Overload Protection

Short Circuit Protection

Small Thermally-Enhanced MSOP Package

APPLICATIONS

Telecom Equipment

Network Equipment

DSP/FPGA/Microprocessor Supplies

Instrumentation Equipment/Data Acquisition Systems

TYPICAL APPLICATION CIRCUIT

Figure 1. ADP1715/16 typical operation circuit

GENERAL DESCRIPTION

The ADP1715/16 is a 500mA low-dropout linear r egulator

that uses an advanced, proprietary architecture to provide high

power supply rejection ratio (PSRR) and excellent line and

load transient response with just a small 2.2µF ceramic output

capacitor. Supply current in shutdown mode is reduced to less

than 1µA.

Three versions of this part are available: one with fixed output

voltage and variable soft-start, one with fixed output voltage

and output voltage tracking, and one with adjustable output

voltage and fixed soft start. The fixed output voltage is

internally set to one of sixteen values between 0.75V and

3.3V while the adjustable output voltage can be set between

0.8V and 5.0V by an external voltage divider from OUT to

ADJ. The variable soft-start uses an external capacitor at SS

to control the output voltage ramp while the internal soft-start

uses a 3pF capacitor to give a constant 24µs ramp. Tracking

limits the output voltage to the at-or-below voltage at the TRK

pin.

The ADP1715/16 is available in a thermally-enhanced MSOP

package, making it a very compact solution for applications

requiring up to 500mA of output current in a small, low-

profile footprint.

PIN CONFIGURATION

Rev.

PrA

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reliable. However, no responsibility is assumed by Analog Devices for its use,

nor for any infringements of patents or other rights of third parties that may

result from its use. Specifications subject to change without notice. No license

is granted by implication or otherwise under any patent or patent rights of

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their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106,

U.S.A.

Tel: 781.329.4700 www.analog.com

Fax: 781.461.3113

PRELIMINARY TECHNICAL DATA

ADP1715/ADP1716

Rev. PrA | Page 2 of 9

ADP1715/16 TARGET SPECIFICATIONS

Table 1. Electrical Characteristics

= 5V, I

OUT

= 100mA, C

LOAD

= 2.2µF, T

= 25°C, BOLD values indicate spec applies over T

=-40°C to 125°C,

unless otherwise noted.

Parameter Conditions Min Typ Max Unit

Input Voltage 2.5 5.5 V

100uA 80 90 µA

100mA

Operating Supply Current

500mA

Shutdown Supply Current EN = GND 0.1 1.0 µA

IOUT = 10mA -1 +1 %

10mA < IOUT < 500mA -2 +2 %

Fixed Output Voltage Accuracy

10mA < IOUT < 500mA, TA = -40°C to 85°C -3 +3 %

ADJ Regulation Votlage IOUT = 10mA 792 800 808 mV

10mA < IOUT < 500mA 784 816 mV

ADJ Inupt Bias Current VADJ=VOUT nA

Line Regulation VIN = (VOUT + 0.5V) to 5.5V, IOUT = 1mA -0.15 0 +0.15 %/V

Load Regulation 10mA < IOUT < 500mA 0.01 0.04 %/A

IOUT = 100mA 125 250 mV

Dropout Voltage (Note 1) IOUT = 500mA 250

Current Limit Threshold VOUT = 0.9 x VOUT(NOM) 550 TBD 850 mA

Thermal Shutdown Temperature Typical Thermal Hysteresis = 15°C 150 °C

SS Source Current ADP1715 Only, SS =GND 0.8 1 1.2 µA

SS Pull Up Voltage ADP1715, (Not to be inlduced in final data

sheet, design spec only) 1.0 1.5 V

SS Pull Down Resistance ADP1715, EN = GND (Not to be included on

final data sheet, design spec only) 12 Ω

TRK to OUT Accuracy ADP1716-XX Only, VTRK = 0.5 x VOUT(NOM) -50 0 50 mV

EN Input High 2.5V ≤ VIN ≤ 5.5V 1.8 V

EN Input Low 2.5V ≤ VIN ≤ 5.5V 0.8 V

EN Input Leakage Current EN = IN or GND -0.1 0 +0.1 µA

PSRR 1kHz, Iout = 500mA 60 dB

Output Noise TBD uVrms

Notes:

1. Dropout voltage is defined as the input to output voltage differential when the input voltage is set to the nominal outp ut voltage. Applies for output

voltages above 2.5V only.

PRELIMINARY TECHNICAL DATA ADP1715/ADP1716

Rev. PrA | Page 3 of 9

ABSOLUTE MAXIMUM RATINGS

Table 2 Absolute Maximum Ratings (at 25°C, unless

otherwise noted)

Parameter Rating

IN, OUT, EN, TRK, ADJ, SS to GND 6 V

OUT to IN -0.3V to (VIN +

0.3V)

Maximum Output Current TBD

Storage Temperature Range –65°C to +150°C

Operating Junction Temperature Range –40°C to +125° C

Maximum Junction Temperature 150°C

Lead Temperature Range (Soldering,

10sec) 300°C

Table 3 Thermal Resistance

Package Type θ

θθ

θJA1 Unit

8-lead Thermally Enhanced

MSOP TBD °C/W

1 θJA is specified for the worst-case conditions, i.e., θJA is specified for

device soldered in circuit board for surface mount packages.

ESD CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily

accumulate on the human body and test equipment and can discharge without detection. Although these

products feature proprietary ESD protection circuitry, permanent damage may occur on devices

subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended

to avoid performance degradation or loss of functionality.

PRELIMINARY TECHNICAL DATA ADP1715/ADP1716

Rev. PrA | Page 4 of 9

PIN DESCRIPTION

Table 4. Pin numbers are Preliminary and Subject To Change)

ADP1715

Number -XXX -ADJ

ADP1716 Description

2 IN IN IN Power Source Input. IN is the source input to the LDO. Connect the input

voltage to IN. Bypass IN to GND with a 2.2µF or greater capacitor.

3 OUT OUT OUT Regulated Votlage Output. OUT is the output voltage of the LDO. Bypass

OUT to GND with a 2.2µF or greater capacitor

1 EN EN EN Enable Input. The ADP1715/16 is turned on/off by the state of EN. Drive

EN high to turn on the LDO, drive it low to turn it off. For automatic startup,

connecte EN to IN.

SS Soft-Start Control Input. Connect a capacitor from SS to GND to set the soft-

start period. A 10nF capacitor sets the soft-start period to 8ms. If not used,

the part will have a fixed startup ramp of 24µs.

ADJ Adjustable Output Voltage Control Input. A resistive voltage divider from

OUT to ADJ sets the output voltage for adjustable output voltage versions.

These parts will have a fixed startup ramp of 24µs.

TRK Tracking Input. A voltage applied to TRK limits the output voltage. To force

the output votlage to track an external signal, drive TRK with that signal. If

not used, connect TRK to IN.

5, 6, 7, 8 GND GND GND Ground.

PIN CONFIGURATIONS:

PRELIMINARY TECHNICAL DATA ADP1715/ADP1716

Rev. PrA | Page 5 of 9

TYPICAL PERFORMANCE CHARACTERISTICS

TEMPERATURE – oC85 125

0–40

VOUT – V

10.010

10.005

10.000

9.995

9.990

9.985

Figure 1. Output Voltage vs. Load Current

TEMPERATURE – oC85 125

0–40

VOUT – V

5.008

5.004

5.000

4.996

4.992

Figure 2.Ground Current vs. Input Voltage

TEMPERATURE – oC

–40

VOUT – V

2.502

2.501

–25 –10 520 35 50 65 80 95 110 125

2.500

2.499

2.498

Figure 3. Output Voltage vs. Temperature

12 2816 20 24 32 36 40

SUPPLY CURRENT – mA

0.8

0.7

0.6

0.5

0.4

INPUT VOLTAGE – V

+125oC

+25oC

–40oC

Figure 4.Ground Current vs. Load Current

PRELIMINARY TECHNICAL DATA ADP1715/ADP1716

Rev. PrA | Page 6 of 9

12 2816 20 24 32 36 40

INPUT CURRENT – mA

+125oC

0.8

0.7

0.6

0.5

0.4

INPUT VOLTAGE – V

+25oC

–40oC

Figure 5. Ground Current vs., Temperature

INPUT VOLTAGE – V

SUPPLY CURRENT – mA

10 15 20 25 30 35 40

0.40

0.45

0.50

0.55

0.60

0.65

0.70

0.75

0.80

0.85

+125

–40

+25

Figure 6. PSRR vs. Frequency

85 125

= 0 TO 10mA

LOAD REGULATION – ppm/mA

TEMPERATURE –

= 40V

= 14V

500–40

–40

–30

–20

–10

Figure 7. Dropout Voltage vs. Load Current

85 125

= 0 TO 5mA

LOAD REGULATION – ppm/mA

TEMPERATURE –

= 40V

= 8V

0–40

–20

–10

Figure 8.Load Transient Response

PRELIMINARY TECHNICAL DATA ADP1715/ADP1716

Rev. PrA | Page 7 of 9

THEORY OF OPERATION

Introduction

The ADP1715/16 is a low-dropout linear regulator that uses

an advanced, proprietary architecture to provide high power

supply rejection ratio (PSRR) and excellent line and load

transient response with just a small 2.2µF ceramic output

capacitor. Supply current in shutdown mode is reduced to

1µA.

Three versions are available: one with fixed output voltage

and soft-start, one with fixed output voltage and output

voltage tracking, and one with adjustable output voltage. The

fixed output voltage is internally set to one of sixteen values

between 0.75V and 3.3V. The adjustable output voltage is set

between 0.8V and 5.0V by an external voltage divider from

OUT to ADJ. The soft-start uses an external capacitor at SS

to control the output voltage ramp. In the case of the

adjustable version, ADP1715-ADJ, the soft-start is controlled

by an internal 3pF capacitor, limiting the output voltage ramp-

up period to approximately 24µs. Tracking limits the output

voltage to the at-or-below the voltage at TRK.

The ADP1715/16 is available in a thermally-enhanced MSOP

package, making it a very compact solution for applications

requiring up to 500mA in a small, low-profile footprint.

Soft-start Function (ADP1715)

For applications that require a controlled startup, the ADP1715

provides a programmable soft-start function. Programmable

soft-start is useful for reducing inrush current upon startup and

for providing voltage sequencing. To implement soft-start,

connect a capacitor from SS to GND. Upon startup, a 1µA

current source charges the capacitor. The ADP1715 startup

output voltage is limited by the voltage at SS, providing a

smooth ramp up to the nominal output voltage. The soft-start

time is calculated by TSS= VREF x (CSS/ISS), where TSS is the

soft-start period, VREF is the 0.8V reference voltage, CSS is the

soft-start capacitance from SS to GND, and ISS is the current

sourced from SS (1µA). Note that when the ADP1715 is

disabled, the soft-start capacitor is discharged to GND through

an internal 100Ω resistor.

In the case of the adjustable output version, there is no pin for

soft-start, so the function is switched to an internal 3pF

capacitor. This sets the soft-start ramp-up period to

approximately 24µs. Using the suggested 2.2µF output

capacitor, the resulting input inrush current is approximately

460mA, which is less than the maximum 500mA load current.

Voltage Tracking Function (ADP1716)

For applications that require voltage tracking, the ADP1716

provides a TRK pin. The ADP1716’s output voltage is not

allowed to exceed the voltage on the TRK pin, allowing control

of the output voltage of the ADP1716 by another voltage rail in

the system. The ADP1716’s tracking function is always

enabled, hence if the voltage applied to TRK pin drops below

the output voltage at any time, the ADP1716’s output tracks it

down. This ensures that the ADP1716 provides proper voltage

tracking under startup and shutdown as well as under fault

conditions.

The ADP1716 is only available in the fixed output voltage

version. A voltage divider is present from TRK to the error

amplifier input whose divider ratio is equal to the divider from

OUT to the error amplifier. This sets the output voltage equal

to the tracking voltage. Both divider ratios are set by post-

package trim depending on the desired output voltage.

Output Capacitor Selection

The ADP1715/16 is optimized for operation with small ceramic

capacitors. For output voltages, VOUT ≥ 2V, the ADP1715/16

operates with just 2.2µF of output capacitance. For output

voltages below 1.8V, additional output capacitance may be

required. Ceramic capacitors are manufactured with a variety of

dielectrics, each with different behavior over temperature and

applied voltage. When choosing your capacitor be sure to

choose a dielectric adequate to ensure the minimum

capacitance over the necessary temperature range.

Thermal Protection and Current Limit

The ADP1715/16 contains internal current limiting to protect

itself and it’s loads during overload and short-circuit

conditions. In addition to current limiting, this device contains

automatic thermal overload protection circuitry to provide

additional protection under continuous short-cir cuit conditions.

Adjustable Output Voltage

The ADP1715-ADJ’s output voltage is adjustable over a 0.8V

to 5.0V range. The output voltage is set by connecting a

resistive voltage divider from OUT to ADJ. The output voltage

is calculated using the equation VOUT=0.8V(1+RTOP/RBOTTOM)

where RTOP is the resistor from OUT to ADJ and RBOTTOM is the

resistor from ADJ to GND. The maximum bias current into

ADJ is 100nA, so for less than 0.1% error due to the bias

current, use values less than 12kΩ for RBOTTOM.

Shutdown

The ADP1715/16 includes a low power shutdown state entered

by driving EN to GND. In shutdown, power consumption is

1µA. When the ADP1715-XX is disabled, the soft-start

capacitor CSS is discharged to GND with a 100Ω resistance.

Package and Power Dissipation

The ADP1715/16 use a thermally-enhanced MSOP package,

which achieves a respectable TBD°C/W for such a small

footprint.

PRELIMINARY TECHNICAL DATA ADP1715/ADP1716

Rev. PrA | Page 8 of 9

OUTLINE DIMENSIONS

PRELIMINARY TECHNICAL DATA ADP1715/ADP1716

Rev. PrA | Page 9 of 9

ORDERING GUIDE

TABLE 5

Output

Voltage Temperature

Range

ADP1715/16

(V)

Variable

Soft-

start

Option

Tracking

Option Package

Description Package

Option Top

Mark

No. of

Parts

per

Reel (°C)

ADP1715-075 0.75V Yes No 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1715-080 0.80V Yes No 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1715-085 0.85V Yes No 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1715-090 0.90V Yes No 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1715-095 0.95V Yes No 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1715-100 1.00V Yes No 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1715-105 1.05V Yes No 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1715-110 1.10V Yes No 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1715-115 1.15V Yes No 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1715-120 1.20V Yes No 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1715-130 1.30V Yes No 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1715-150 1.50V Yes No 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1715-180 1.80V Yes No 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1715-250 2.50V Yes No 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1715-300 3.00V Yes No 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1715-330 3.30V Yes No 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1715-ADJ 0.8V to 5.0V No No 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1716-075 0.75V No Yes 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1716-080 0.80V No Yes 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1716-085 0.85V No Yes 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1716-090 0.90V No Yes 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1716-095 0.95V No Yes 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1716-100 1.00V No Yes 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1716-105 1.05V No Yes 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1716-110 1.10V No Yes 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1716-115 1.15V No Yes 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1716-120 1.20V No Yes 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1716-130 1.30V No Yes 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1716-150 1.50V No Yes 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1716-180 1.80V No Yes 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1716-250 2.50V No Yes 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1716-300 3.00V No Yes 8-lead MSOP RN TBD TBD -40°C to +125°C

ADP1716-330 3.30V No Yes 8-lead MSOP RN TBD TBD -40°C to +125°C

PR06110-0-4/06(PrA)