Dual 3 MHz, 600 mA Buck
Regulator with 150 mA LDO
ADP5022
FEATURES
GENERAL DESCRIPTION
Input voltage range: 2.4 V to 5.5 V
Tiny 16-ball, 2 mm × 2 mm WLCSP package
Overcurrent and thermal protection
Soft start
Factory programmable undervoltage lockout on VDDA
system supply of either 2.2 V or 3.9 V
Factory programmable default output voltages for all
3 channels
Buck1 and Buck2 key specifications
Current mode architecture for excellent transient response
3 MHz operating frequency
Uses tiny multilayer inductors and capacitors
Forced PWM and auto PWM/PSM modes
Out-of-phase operation for reduced input filtering
100% duty cycle low dropout mode
24 μA typical quiescent current per channel, no switching
LDO key specifications
The ADP5022 is a micro power management unit (micro PMU)
that combines two high performance buck regulators and a low
dropout regulator (LDO) in a tiny 16-ball 2.08 mm × 2.08 mm
WLCSP to meet demanding performance and board space
requirements.
The high switching frequency of the buck regulators enables
tiny multilayer external components and minimizes the board
space required. When the MODE pin is set high, the buck reg-
ulators operate in forced PWM mode. When the MODE pin is
set low, the buck regulators automatically switch operating
modes, depending on the load current level. At higher output
loads, the buck regulators operate in PWM mode. When the
load current falls below a predefined threshold, the regulators
operate in power save mode (PSM), improving the light-load
efficiency.
The two bucks operate out-of-phase to reduce the input
capacitor requirement and noise.
Stable with 1 μF ceramic output capacitors
High PSRR
60 dB up to 10 KHz
The low quiescent current, low dropout voltage, and wide input
voltage range of the ADP5022 LDO extends the battery life of
portable devices. The LDO maintains power supply rejection
greater than 60 dB for frequencies as high as 10 kHz while
operating with a low headroom voltage.
Low output noise
65 μV rms output noise at VOUT3 = 3.3 V
Low dropout voltage: 150 mV @ 150 mA load
11 μA typical ground current at no load
Each regulator in the ADP5022 has a dedicated, independent
enable pin. A high voltage level applied to the enable pin activates
the respective regulator. The default output voltages are factory
programmable and can be set to a wide range of options.
APPLICATIONS
USB devices
Handheld products
Multivoltage power for processors, ASICS, FPGAs,
and RF chipsets
ADP5022
L1
COUT_3
1µH
SW1
V
@
OUT1
600mA
VIN1
EN1
V
= 2.4V
IN
TO 5.5V
VOUT1
PGND1
BUCK1
C4
C3
C4
ON
C2
4.7µF
10µF
OFF
EN_BK1
MODE
PWM
C1
C2
MODE
PWM/PSM
VIN2
L2
1µH
C3
4.7µF
SW2
MODE
V
@
OUT2
600mA
VOUT2
PGND2
ON
ON
BUCK2
C5
5.0mm
EN2
VDDA
VIN3
10µF
OFF
OFF
EN_BK2
C1
1µF
VOUT3
V
@
LDO1
EN_LDO1
OUT3
150mA
EN3
C6
1µF
L1
COUT_1 COUT_2
4.7mm
AGND
Figure 1. Typical Applications Circuit
Figure 2. Typical PCB Layout
Rev. A
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 registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2009 Analog Devices, Inc. All rights reserved.
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