Ordering Information appears at end of data sheet.

Features

●

2.1MHz Switching Frequency

●

Low VCESAT Switch: 330mV at 1.1A

●

High Output Voltage: Up to 24V

●

Wide Input Range: 2.7V to 12V

●

Dedicated Soft-Start Pin

● Uses Small Surface Mount Components

● Low Shutdown Current: <1µA

● Low Profile (1mm) ThinSOT™ Package

● Low Profile (0.75mm) 8-Lead (3mm × 2mm) Dual

Flat No Lead (DFN) Package

Applications

● Digital Cameras

● White LED Power Supplies

● Cellular Phones

● Medical Diagnostic Equipment

● Local 5V or 12V Supplies

● Thin Film Transistor (TFT)-Liquid Crystal Display

(LCD) Bias Supplies

● xDigital Subscriber Line (xDSL) Power Supplies

Description

The

ADPL21210 switching regulators combine a 26V,

1.1A switch with a soft-start function. The ADPL21210

switches at 2.1MHz, allowing the use of even smaller

components. High inrush current at start-up is eliminated

using the programmable soft-start function. A single

external capacitor sets the current ramp rate. A constant-

frequency current mode pulse-width modulator (PWM)

architecture results in low, predictable output noise that

is easy to filter.

The high-voltage switch on the ADPL21210 is rated

at 26V, making the devices ideal for boost converters

up to 24V, as well as SEPIC and flyback designs. The

ADPL21210 is available in a low-profile (1mm) 6-lead

Small outline transistor (SOT)-23 package and tiny 3mm

× 2mm DFN package.

Rev 0; 1/26

Figure 1. Single Li-Ion Cell to 5V Boost Converter

Figure 2. Efficiency vs. Load Current

1.1A Step-Up DC/DC

Converter with Integrated Soft-Start

ADPL21210

One Analog Way, Wilmington, MA 01887 U.S.A. |

Tel: 781.329.4700

|

© 2026 Analog Devices, Inc. All rights reserved.

© 2026 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners.

GND

VIN

SW

SHDN

FB

VIN

2.7V TO 4.2V

D1

L1

0.9µH

R1

8.06kΩ

ADPL21210

C2*

22µF

C4*

75pF

C1

4.7µF

R2

2.67kΩ

VOUT

5V

600mA AT VIN = 4.2V

360mA AT VIN = 3.3V

250mA AT VIN = 2.7V

C1, C2: X5R OR X7R, 6.3V

D1: PHILIPS PMEG 2010

L1: FDK MIPW3226D0R9M

*C2 CAN BE 10µF IN A 1210 OR LARGER PACKAGE WITH

THE ADDITION OF C4, OTHERWISE C4 IS OPTIONAL

SS

C3

0.047µF

OFF ON

Typical Application

IOUT (mA)

50

100

150

200

250

300

350

450

400

500

50

70

65

60

55

75

80

85

90

95

VIN = 4.2V

VIN = 3.3V

VIN = 2.7V