ADP5023(RevA) Просмотр технического описания (PDF) - Analog Devices
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ADP5023 Datasheet PDF : 28 Pages
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Data Sheet
Dual 3 MHz, 800 mA Buck
Regulators with One 300 mA LDO
ADP5023
FEATURES
Main input voltage range: 2.3 V to 5.5 V
Two 800 mA buck regulators and one 300 mA LDO
24-lead, 4 mm × 4 mm LFCSP package
Regulator accuracy: ±3%
Factory programmable or external adjustable VOUTx
3 MHz buck operation with forced PWM and auto PWM/PSM
modes
BUCK1/BUCK2: output voltage range from 0.8 V to 3.8 V
LDO: output voltage range from 0.8 V to 5.2 V
LDO: input supply voltage from 1.7 V to 5.5 V
LDO: high PSRR and low output noise
APPLICATIONS
Power for processors, ASIC, FPGAs, and RF chipsets
Portable instrumentation and medical devices
Space constrained devices
GENERAL DESCRIPTION
The ADP5023 combines two high performance buck regulators
and one low dropout (LDO) regulator in a small, 24-lead 4 mm ×
4 mm LFCSP 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.
When the MODE pin is set high, the buck regulators operate in
forced PWM mode. When the MODE pin is set low, the buck
regulators operate in PWM mode when the load current is
above a predefined threshold. When the load current falls below
a predefined threshold, the regulator operates in power save
mode (PSM) improving the light-load efficiency.
The two bucks operate out of phase to reduce the input capaci-
tor requirement. The low quiescent current, low dropout voltage,
and wide input voltage range of the ADP5023 LDO extends the
battery life of portable devices. The ADP5023 LDO maintains
power supply rejection greater than 60 dB for frequencies as
high as 10 kHz while operating with a low headroom voltage.
Regulators in the ADP5023 are activated though dedicated
enable pins. The default output voltages can be externally set in
the adjustable version or factory programmable to a wide range
of preset values in the fixed voltage version.
2.3V TO
5.5V
1.7V TO
5.5V
TYPICAL APPLICATION CIRCUIT
CFILT
0.1µF
C1
4.7µF
ON
OFF
AVIN
VIN1
EN1
HOUSEKEEPING
BUCK1
EN1 MODE
C2
4.7µF
ON
OFF
C3
1µF
VIN2
EN2
EN3
VIN3
MODE
BUCK2
EN2
EN3
LDO
ADP5023
AGND
VOUT1
SW1
FB1
PGND1
MODE
VOUT2
SW2
FB2
PGND2
L1 1µH
R1
R2
VOUT1 AT
800mA
C5
10µF
PWM
PSM/PWM
L2 1µH
R3
R4
VOUT2 AT
800mA
C6
10µF
VOUT3
FB3
R5
R6
VOUT3 AT
300mA
C7
1µF
Figure 1.
Rev. A
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Fax: 781.461.3113 ©2011-2012 Analog Devices, Inc. All rights reserved.
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