Triple 1800 mA Buck Regulator with
Precision Enables and Power-Good Outputs
ADP5135
Data Sheet
FEATURES
TYPICAL APPLICATION CIRCUIT
Input voltage range: 3.0 V to 5.5 V
ADP5135
Three 1800 mA buck regulators
24-lead, 4 mm × 4 mm LFCSP package
Regulator accuracy: 1.8ꢀ
Factory programmable or external adjustable VOUTx pins
Precision enables for easier power sequencing
Power-good pins for monitoring each regulator
3 MHz buck operation with forced PWM and auto PWM/PSM
modes
3.0V
TO
5.5V
HOUSE-
AVIN
17
18
KEEPING
V
DDIO
C7
AGND
VOUT1
0.1µF
10
L1 1µH
VIN1
SW1
FB1
16
14
15
11
C1
10µF
R1
R2
PWM
PGND1
BUCK1
1.8A
C2
22µF
ON
EN1
12
OFF
MODE
AUTO
13
9
VIN2
VOUT2
3
5
BUCK1/BUCK2/BUCK3: output voltage range from 0.8 V to 3.8 V
C3
10µF
PGND2
L2 1µH
SW2
FB2
BUCK2
1.8A
4
8
APPLICATIONS
R3
R4
ON
EN2
C4
22µF
7
OFF
Power for processors, application specific integrated circuits
(ASICs), field-programmable gate arrays (FPGAs), and
radio frequency (RF) chipsets
Portable instrumentation and medical devices
Space constrained devices
VOUT3
VIN3
21
19
22
C5
10µF
L3 1µH
PGND3
SW3
FB3
BUCK3
1.8A
20
23
R5
R6
C6
22µF
ON
EN3
24
OFF
V
DDIO
R7
100Ω
PG1
PG2
PG3
R8
100Ω
POWER
GOOD
6
2
1
R9
100Ω
Figure 1.
Table 1. Family Devices
GENERAL DESCRIPTION
Max
Current
The ADP5135 combines three high performance buck regulators
(BUCK1, BUCK2, and BUCK3). It is available in a 24-lead,
4 mm × 4 mm LFCSP.
Device
Channels
Package
ADP5023 2 buck regulators, 1 LDO
ADP5024 2 buck regulators, 1 LDO
ADP5034 2 buck regulators, 2 LDOs
ADP5037 2 buck regulators, 2 LDOs
800 mA,
300 mA
LFCSP (CP-24-10)
1.2 A,
300 mA
LFCSP (CP-24-10)
The high switching frequency of the buck regulators enables tiny
multilayer external components and minimizes the board space.
When the MODE pin is set to high, the buck regulators operate in
forced pulse-width modulation (PWM) mode. When the
MODE pin is set to low, the buck regulators operate in PWM
mode only when the load is above a predefined threshold. When
the load current falls below this predefined threshold, the
regulator operates in power save mode (PSM), improving the
light load efficiency.
1.2 A,
300 mA
LFCSP (CP-24-10),
TSSOP (RE-28-1)
800 mA,
300 mA
LFCSP (CP-24-10)
WLCSP (CB-16-8)
LFCSP (CP-20-10)
LFCSP (CP-20-10)
ADP5033 2 buck regulators, 2 LDOs
with 2 ENx pins
800 mA,
300 mA
ADP5040 1 buck regulator, 2 LDOs
1.2 A,
300 mA
ADP5041 1 buck regulator, 2 LDOs
with supervisory circuit,
watchdog function, and
manual reset
1.2 A,
300 mA
BUCK1 and BUCK2 operate in synchronization, and BUCK3
operates out of phase to reduce the input capacitor requirement.
ADP5133 2 buck regulators with
2 ENx pins
800 mA
WLCSP (CB-16-8)
LFCSP (CP-24-7)
Regulators in the ADP5135 are activated through 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.
ADP5134 2 buck regulators, 2 LDOs
with precision enable and
power good
1.2 A,
300 mA
Rev. 0
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