Dual 2 MHz, 800 mA, Synchronous, Low
Quiescent Current Buck Regulator
Data Sheet
ADP2230
FEATURES
TYPICAL APPLICATION CIRCUIT
Input voltage range: 2.3 V to 6.5 V
ADP2230
L1
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
2.2µH
V
2
9
VIN1
IN
V
1
OUT1
SW1
FB1
C
IN
VIN2
10µF
C
10µF
3
OUT1
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
ON
ON
4
7
EN1
EN2
OFF
L2
2.2µH
10
8
V
SW2
FB2
OFF
OUT2
PWM
C
10µF
OUT2
6
SYNC
PSM/PWM
PGND
(EPAD)
11
AGND
5
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
180° phase shifted PWM outputs for minimum VIN ripple
Current-limit and thermal shutdown (TSD) protection
Quick output discharge (QOD)
Figure 1. Fixed Output Voltage Typical Application Circuit
10-lead, 3 mm × 3 mm × 0.75 mm LFCSP package
APPLICATIONS
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.
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
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.
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
total solution size is about 48 mm2, resulting in the smallest
footprint solution to meet a variety of portable applications.
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.
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.
Rev. A
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