Analog Devices ADP5037CP Evaluation Board ADP5037CP-EVALZ ADP5037CP-EVALZ データシート
製品コード
ADP5037CP-EVALZ
Dual 3 MHz, 800 mA Buck
Regulators with Two 300 mA LDOs
Data Sheet
Rev. D
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Trademarks and registered trademarks are the property of their respective owners.
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FEATURES
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
Regulator accuracy: ±1.8%
Factory programmable or external adjustable VOUTx
3 MHz buck operation with forced PWM and auto PWM/PSM
Two 800 mA buck regulators and two 300 mA LDOs
24-lead, 4 mm × 4 mm LFCSP package
Regulator accuracy: ±1.8%
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
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
Power for processors, ASICS, FPGAs, and RF chipsets
Portable instrumentation and medical devices
Space constrained devices
Portable instrumentation and medical devices
Space constrained devices
GENERAL DESCRIPTION
combines two high performance buck regulators
and two low dropout (LDO) regulators in a small, 24-lead 4 mm ×
4 mm LFCSP to meet demanding performance and board space
requirements.
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 and the
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 and the
load is above a predefined threshold, the buck regulators
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.
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.
Table 1. Family Models
Model Channels
Maximum
Current Package
Current Package
2 Buck, 1 LDO
800 mA,
300 mA
300 mA
LFCSP (CP-24-10)
2 Buck, 1 LDO
1.2 A,
300 mA
300 mA
LFCSP (CP-24-10)
2 Buck, 2 LDOs
1.2 A,
300 mA
300 mA
LFCSP (CP-24-10),
TSSOP (RE-28-1)
TSSOP (RE-28-1)
2 Buck, 2 LDOs
800 mA,
300 mA
300 mA
LFCSP (CP-24-10)
2 Buck, 2 LDOs with
2 EN pins
2 EN pins
800 mA,
300 mA
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
tor requirement. The low quiescent current, low dropout voltage,
and wide input voltage range of the
LDOs extend the
battery life of portable devices. The
LDOs maintain
power supply rejection greater than 60 dB for frequencies as
high as 10 kHz while operating with a low headroom voltage.
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 externally set in
the adjustable version or factory programmable to a wide range
of preset values in the fixed voltage version.
the adjustable version or factory programmable to a wide range
of preset values in the fixed voltage version.
TYPICAL APPLICATION CIRCUIT
AGND
VIN3
EN2
EN3
EN4
VIN4
EN1
VIN1
PWM
PSM/PWM
2.3V TO
5.5V
SW1
FB1
R2
R1
VOUT1
PGND1
MODE
C5
10µF
10µF
V
OUT1
AT
800mA
V
OUT2
AT
800mA
V
OUT3
AT
300mA
V
OUT4
AT
300mA
L1 1µH
EN1
BUCK1
MODE
C3
1µF
C2
4.7µF
C1
4.7µF
AVIN
C
AVIN
0.1µF
C4
1µF
VIN2
EN2
BUCK2
MODE
1.7V TO
5.5V
ON
OFF
ON
OFF
EN3
LDO1
(ANALOG)
ADP5037
HOUSEKEEPING
SW2
FB2
R4
R3
VOUT2
PGND2
C6
10µF
10µF
L2 1µH
FB3
R6
R5
VOUT3
C7
1µF
1µF
FB4
R8
R7
VOUT4
C8
1µF
1µF
EN4
LDO2
(DIGITAL)
0988
7-
00
1
Figure 1.