Analog Devices ADP1610 Datasheet

1.2 MHz DC-DC Step-Up Switching Converter

FEATURES

Fully integrated 1.2 A , 0.2 Ω, power switch
Pin-selectable 700 kHz or 1.2 MHz PWM frequency
92% efficiency
Adjustable output voltage up to 12 V
3% output regulation accuracy
Adjustable soft start
Input undervoltage lockout
MSOP 8-lead package

APPLICATIONS

TFT LC bias supplies
Portable applications
Industrial/instrumentation equipment

FUNCTIONAL BLOCK DIAGRAM

REF

FB

2

RAMP

GEN

7

RT

OSC

ERROR

g

m

COMP

1 6

AMP

COMPARATOR

ADP1610

GENERAL DESCRIPTION

The ADP1610 is a dc-to-dc step-up switching converter with an
integrated 1.2 A, 0.2 Ω power switch capable of providing an
output voltage as high as 12 V. With a package height of less that

1.1 mm, the ADP1610 is optimal for space-constrained
applications such as portable devices or thin film transistor
(TFT) liquid crystal displays (LCDs).

The ADP1610 operates in pulse-width modulation (PWM)
current mode with up to 92% efficiency. Adjustable soft start
prevents inrush currents at startup. The pin-selectable switching
frequency and PWM current-mode architecture allow excellent
transient response, easy noise filtering, and the use of small,
cost-saving external inductors and capacitors.

The ADP1610 is offered in the Pb-free 8-lead MSOP and
operates over the temperature range of −40°C to +85°C.

IN

ADP1610

BIAS

SW

F/F

QSR

DRIVER

5

8

SOFT START

SS

3

SD

Rev. 0

Information furnished by Analog Devices is believed to be accurate and 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 Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.

Figure 1.

CURRENT

SENSE

AMPLIFIER

4

GND

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Tel: [phone]
Fax: [phone] © 2004 Analog Devices, Inc. All rights reserved.

www.analog.com

04472-001

ADP1610

TABLE OF CONTENTS

Specifications..................................................................................... 3

Choosing the Input and Output Capacitors ........................... 11

Absolute Maximum Ratings............................................................ 4

ESD Caution.................................................................................. 4

Pin Configuration and Function Descriptions............................. 5

Typical Performance Characteristics ............................................. 6

Theory of Operation ...................................................................... 10

Current-Mode PWM Operation.............................................. 10

Frequency Selection ................................................................... 10

Soft Start ......................................................................................10

On/Off Control........................................................................... 10

Setting the Output Voltage........................................................ 10

REVISION HISTORY

10/04—Revision 0: Initial Version

Diode Selection........................................................................... 12

Loop Compensation .................................................................. 12

Soft Start Capacitor.................................................................... 13

Application Circuits................................................................... 13

DC-DC Step-Up Switching Converter with True Shutdown14

TFT LCD Bias Supply................................................................ 14

Sepic Power Supply .................................................................... 14

Layout Procedure ........................................................................... 15

Outline Dimensions....................................................................... 16

Ordering Guide .......................................................................... 16

Rev. 0 | Page 2 of 16

ADP1610

SPECIFICATIONS

VIN = 3.3 V, TA = −40°C to +85°C, unless otherwise noted.
All limits at temperature extremes are guaranteed by correlation and characterization using standard statistical quality control (SQC),
unless otherwise noted.

Table 1.

Parameter Symbol Conditions Min Typ Max Unit
SUPPLY

Input Voltage V

IN

Quiescent Current

Nonswitching State I
Shutdown I

Switching State

1

Q

SD

Q

IQ

SW

OUTPUT

Output Voltage V

OUT

Load Regulation I
Overall Regulation Line, load, temperature

REFERENCE

Feedback Voltage V

FB

Line Regulation VIN = 2.5 V to 5.5 V −0.15 +0.15 %/V

ERROR AMPLIFIER

Transconductance g
Voltage Gain A

m

V

FB Input Bias Current V

SWITCH

SW On Resistance R

ON

SW Leakage Current VSW = 12 V 0.01 20 µA
Peak Current Limit

2

I

CLSET

OSCILLATOR

Oscillator Frequency f

RT = GND 0.49 0.7 0.885 MHz

OSC

RT = IN 0.89 1.23 1.6 MHz
Maximum Duty Cycle D

MAX

SHUTDOWN

Shutdown Input Voltage Low V
Shutdown Input Voltage High V
Shutdown Input Bias Current I

IL

IH

SD

SOFT START

SS Charging Current VSS = 0 V 3 µA

UNDERVOLTAGE LOCKOUT

3

UVLO Threshold VIN rising 2.2 2.4 2.5 V
UVLO Hysteresis 220 mV

1

This parameter specifies the average current while switching internally and with SW (Pin 5) floating.

2

Guaranteed by design and not fully production tested.

3

Guaranteed by characterization.

2.5 5.5 V

VFB = 1.3 V, RT = V

IN

390 600 µA

VSD = 0 V 0.01 10 µA

fSW = 1.23 MHz, no load 1 2 mA

V

= 10 mA to 150 mA, V

LOAD

= 10 V 0.05 mV/mA

OUT

IN

12 V

±3

%

1.212 1.230 1.248 V

∆I = 1 µA

100 µA/V

60 dB

= 1.23 V

FB

10 nA

ISW = 1.0 A 200 400 mΩ

2.0 A

COMP = open, VFB = 1 V, RT = GND 78 83 90 %

Nonswitching state 0.6 V
Switching state 2.2 V
VSD = 3.3 V 0.01 1 µA

Rev. 0 | Page 3 of 16

ADP1610

ABSOLUTE MAXIMUM RATINGS

Table 2.

Parameter Rating
IN, COMP, SD, SS, RT, FB to GND
SW to GND 14 V
RMS SW Pin Current 1.2 A
Operating Ambient Temperature Range −40°C to +85°C
Operating Junction Temperature Range −40°C to +125°C
Storage Temperature Range −65°C to +150°C
θJA, Two Layers 206°C/W
θJA, Four Layers 142°C/W
Lead Temperature Range (Soldering, 60 s) 300°C

V

OUT

R1

FB

2

R2

V

IN

1.2MHz

700kHz

RT

7

3

SD
SS

C

SS

8

−0.3 V to +6 V

R

C

C

C

COMP

1 6

ERROR

REF

RAMP

AMP

g

m

GEN

OSC

SOFT START

COMPARATOR

Figure 2. Block Diagram and Typical Application Circuit

Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or
any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability. Absolute maximum ratings apply individually
only, not in combination. Unless otherwise specified, all other
voltages are referenced to GND.

IN

C

IN

L1

D1

V

OUT

C

OUT

04472-002

F/F

QSR

IN

BIAS

CURRENT

SENSE

AMPLIFIER

ADP1610

DRIVER

SW

5

4

GND

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 this product features
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.

Rev. 0 | Page 4 of 16

ADP1610

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

1

COMP

GND

FB
SD

ADP1610

2

TOP VIEW

3

(Not to Scale)

4

Figure 3. Pin Configuration

Table 3. Pin Function Descriptions

Pin No. Mnemonic Description

1 COMP

Compensation Input. Connect a series resistor-capacitor network from COMP to GND to compensate the
regulator.

2 FB

Output Voltage Feedback Input. Connect a resistive voltage divider from the output voltage to FB to set the
regulator output voltage.

3

SD Shutdown Input. Drive SD low to shut down the regulator; drive SD high to turn it on.
4 GND Ground.
5 SW

Switching Output. Connect the power inductor from the input voltage to SW and connect the external rectifier
from SW to the output voltage to complete the step-up converter.

6 IN

Main Power Supply Input. IN powers the ADP1610 internal circuitry. Connect IN to the input source voltage.
Bypass IN to GND with a 10 µF or greater capacitor as close to the ADP1610 as possible.

7 RT

Frequency Setting Input. RT controls the switching frequency. Connect RT to GND to program the oscillator to
700 kHz, or connect RT to IN to program it to 1.2 MHz.

8 SS Soft Start Timing Capacitor Input. A capacitor from SS to GND brings up the output slowly at power-up.

8

SS

RT

7

IN

6

5

SW

04472-003

Rev. 0 | Page 5 of 16