Data Sheet
FEATURES
Main input voltage range: 2.3 V to 5.5 V
Two 1200 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 automatic
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
Dual 3 MHz, 1200 mA Buck
Regulators with One 300 mA LDO
ADP5024
GENERAL DESCRIPTION
The
combines two high performance buck regula-
tors 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 pre-
defined 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 capacitor
requirement. The low quiescent current, low dropout voltage, and
wide input voltage range of the 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.
Regulators in the
are activated though dedicated
enable pins. The default output voltages can be either externally
set in the adjustable version or factory programmable to a wide
range of preset values in the fixed voltage version.
APPLICATIONS
Power for processors, ASICS, FPGAs, and RF chipsets
Portable instrumentation and medical devices
Space constrained devices
TYPICAL APPLICATION CIRCUIT
AVIN
C
AVIN
0.1µF
2.3V TO
5.5V
VIN1
C1
4.7µF
ON
OFF
EN1
EN1
BUCK1
HOUSEKEEPING
VOUT1
SW1
FB1
PGND1
MODE
MODE
VIN2
C2
4.7µF
EN2
ON
OFF
1.7V TO
5.5V
EN3
VIN3
C3
1µF
EN2
EN3
VOUT2
MODE
SW2
BUCK2
FB2
PGND2
VOUT3
LDO
(ANALOG)
FB3
R5
R6
C7
1µF
09888-001
L1 1µH
R1
R2
PWM
C5
10µF
V
OUT1
AT
1200mA
PSM/PWM
L2 1µH
R3
R4
C6
10µF
V
OUT3
AT
300mA
V
OUT2
AT
1200mA
ADP5024
AGND
Figure 1.
Rev. A
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