Dual 2 MHz, 800 mA, Synchronous, Low

Quiescent Current Buck Regulator

Data Sheet

ADP2230

FEATURES

Input voltage range: 2.3 V to 6.5 V

Fixed and adjustable output voltage options

Fixed output voltage pair options: 1.2 V/1.8 V, 1.2 V/3.3 V,

1.8 V/3.3 V

Adjustable output voltage range: 0.8 V to 6 V

Minimum guaranteed continuous output current: 800 mA

Up to 94% efficiency

Low quiescent current of 15 µA for both channels in power

saving mode (PSM)

Low shutdown current: 0.1 μA (typical)

100% duty cycle for low dropout operation

SYNC pin switching frequency options

2 MHz fixed pulse-width modulation (PWM) mode

2 MHz PSM/PWM automatic transitioning mode

External clock synchronization from 1.5 MHz to 2.5 MHz

Enable input with precision thresholds for each output

Current-limit and thermal shutdown (TSD) protection

Quick output discharge (QOD)

10-lead, 3 mm × 3 mm × 0.75 mm LFCSP package

APPLICATIONS

Portable and battery-powered equipment

Automatic meter readers (WSN)

Point of sales and transaction processing instruments

Mobile phones

Digital cameras and audio devices

Medical instruments

Medium format display tablets and pads

GENERAL DESCRIPTION

The ADP2230 includes two high efficiency, low quiescent current,

800 mA, step-down, dc-to-dc converters in a small, 10-lead,

3 mm × 3 mm, LFCSP package. The total solution requires only

five tiny external components. When the ADP2230 is used with

three 0603 capacitors and two 2 mm × 2 mm inductors, the

footprint solution to meet a variety of portable applications.

The ADP2230 buck regulator uses a proprietary, high speed,

current mode, constant frequency, PWM control scheme for

excellent stability and transient response. The buck outputs

operate out of phase to reduce the input current ripple.

To ensure the longest battery life in portable applications, the

ADP2230 has a power saving variable frequency mode that

reduces the switching frequency under light load conditions.

TYPICAL APPLICATION CIRCUIT

Figure 1. Fixed Output Voltage Typical Application Circuit

During logic controlled shutdown, the input is disconnected

from the output, and it draws less than 0.1 μA from the input

source. The ADP2230 operates from input voltages from 2.3 V

to 6.5 V, allowing the use of multiple alkaline, NiMH, or lithium

cells and other standard power sources.

The ADP2230 offers multiple options for setting the operating

frequency. To maximize light load efficiency, the ADP2230 can

operate at a reduced switching frequency in PSM and switch

automatically to PWM as the load increases. The ADP2230 can

be forced to operate at 2 MHz in PWM only mode when noise

considerations are more important than efficiency. The

ADP2230 can also be synchronized with a 1.5 MHz to 2.5 MHz

external clock via the SYNC pin. When using the external clock

synchronization control, both buck outputs operate in phase

with the applied clock signal.

The ADP2230 includes an internal power switch, synchronous

rectifier, and compensation to minimize external part count

and maximize efficiency. Other key protection features include

undervoltage lockout to prevent deep battery discharge, internal

soft start to prevent input current overshoot at startup, and an

integrated, switched resistor, QOD function that automatically

discharges the output when the device is disabled. Short-circuit

protection and thermal overload protection circuits prevent

damage in adverse conditions.

EN1

EN2

PGND

(EPAD)

SYNC

SW1

VIN2

VIN1

AGND

10µF

10µF

L1

2

9

ADP2230

1

SW2

10µF

L2

10

5

11

ON

OFF

4

7

6

ON

OFF

PWM

PSM/PWM

Rev. A

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