ADP5037 데이터 시트보기 (PDF) - Analog Devices
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ADP5037 Datasheet PDF : 28 Pages
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Data Sheet
Dual 3 MHz, 800 mA Buck
Regulators with Two 300 mA LDOs
ADP5037
FEATURES
load is above a predefined threshold, the buck regulators
Main input voltage range: 2.3 V to 5.5 V
Two 800 mA buck regulators and two 300 mA LDOs
24-lead, 4 mm × 4 mm LFCSP package
operate in PWM mode. When the load current falls below a
predefined threshold, the regulator operates in power save
mode (PSM), improving the light-load efficiency.
Regulator accuracy: ±1.8%
Table 1. Family Models
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
LDO1/LDO2: output voltage range from 0.8 V to 5.2 V
LDO1/LDO2: input supply voltage from 1.7 V to 5.5 V
LDO1/LDO2: high PSRR and low output noise
APPLICATIONS
Model Channels
ADP5023 2 Buck, 1 LDO
ADP5024 2 Buck, 1 LDO
ADP5034 2 Buck, 2 LDOs
ADP5037 2 Buck, 2 LDOs
Maximum
Current
800 mA,
300 mA
1.2 A,
300 mA
1.2 A,
300 mA
800 mA,
300 mA
Package
LFCSP (CP-24-10)
LFCSP (CP-24-10)
LFCSP (CP-24-10),
TSSOP (RE-28-1)
LFCSP (CP-24-10)
Power for processors, ASICS, FPGAs, and RF chipsets
Portable instrumentation and medical devices
Space constrained devices
GENERAL DESCRIPTION
ADP5033 2 Buck, 2 LDOs with 800 mA,
2 EN pins
300 mA
WLCSP (CB-16-8)
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 ADP5037 LDOs extend the
The ADP5037 combines two high performance buck regulators
battery life of portable devices. The ADP5037 LDOs maintain
and two low dropout (LDO) regulators in a small, 24-lead 4 mm ×
power supply rejection greater than 60 dB for frequencies as
4 mm LFCSP to meet demanding performance and board space
high as 10 kHz while operating with a low headroom voltage.
requirements.
Regulators in the ADP5037 are activated though dedicated
The high switching frequency of the buck regulators enables tiny
enable pins. The default output voltages can be externally set in
multilayer external components and minimizes the board space.
the adjustable version or factory programmable to a wide range
When the MODE pin is set high, the buck regulators operate in
of preset values in the fixed voltage version.
forced PWM mode. When the MODE pin is set low and the
TYPICAL APPLICATION CIRCUIT
2.3V TO
5.5V
1.7V TO
5.5V
CAVIN
0.1µF
C1
4.7µF
ON
OFF
AVIN
VIN1
EN1
HOUSEKEEPING
BUCK1
EN1 MODE
C2
4.7µF
VIN2
EN2
C3
1µF
ON
OFF
C4
1µF
EN3
VIN3
EN4
VIN4
MODE
BUCK2
EN2
EN3 LDO1
(ANALOG)
EN4
LDO2
(DIGITAL)
ADP5037
AGND
VOUT1
SW1
FB1
PGND1
MODE
VOUT2
SW2
FB2
PGND2
VOUT3
FB3
VOUT4
FB4
L1 1µH
R1
R2
VOUT1 AT
800mA
C5
10µF
PWM
PSM/PWM
L2 1µH
R3
R4
R5
R6
VOUT2 AT
800mA
C6
10µF
VOUT3 AT
300mA
C7
1µF
R7
R8
VOUT4 AT
300mA
C8
1µF
Figure 1.
Rev. D
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