3-Channel, Integrated Ultralow Power Solution
with Dual Buck Regulators and Load Switch
Data Sheet
ADP5310
FEATURES
TYPICAL APPLICATION CIRCUIT
Wide input voltage range: 2.7 V to 15.0 V
700 nA quiescent current when EN1 = SYNC/MODE = low
1.5% output accuracy over full temperature range in PWM mode
600 kHz (or 1.2 MHz) switching frequency with optional
synchronization input from 400 kHz to 1.4 MHz
Channel 1: 800 mA buck regulator
Automatic PSM/PWM or forced PWM mode via factory fuse
100% duty cycle operation mode
Adjustable/fixed output options via factory fuse
Power-good flag
Channel 2: ultralow power buck regulator
Selectable hysteresis or PWM operation mode
Output current up to 50 mA in hysteresis mode, 300 mA in
PWM mode with 100% duty cycle operation mode
Low noise at 0.8 V reference in PWM mode
Adjustable/fixed output voltage options via factory fuse
Channel 3: high-side load switch
L1
4.7µH
ADP5310
V
V
V
OUT1
OUT2
OUT3
EN1
SW1
FROM MCU
TO MCU
CHANNEL 1
C3
PWRGD
PVIN1
BUCK
REGULATOR
(800mA)
PGND1
FB1
10µF
MLCC
V
=
IN
R1
R2
2.7V TO 15V
L2
4.7µH
PVIN2
NC
CHANNEL 2
SW2
ULTRALOW
C1
10µF
C4
10µF
MLCC
POWER
PGND2
FB2
BUCK
MLCC SYNC/
MODE
REGULATOR
(50mA/300mA)
CHANNEL 3
LOAD
SWITCH
EN3
VOUT3
FROM MCU
C5
220nF
MLCC
VREG
AGND
C6
1µF
Figure 1.
Low RDS(ON) of 494 mΩ at VOUT3 = 2.5 V
Quick output discharge (QOD) option
UVLO, OCP, and TSD protection
16-lead TSSOP_EP package
−40°C to +125°C operational junction temperature
APPLICATIONS
Energy (gas and water) metering
Portable and battery-powered equipment
Medical applications
Keep-alive power supplies
mode, which draws only 700 nA of quiescent current to regulate
the output under zero load and provides up to 50 mA of output
current. Hysteresis mode helps achieve excellent efficiency at less
than 1 mW and can work as a keep-alive power supply in a battery-
powered system. When the SYNC/MODE pin is set to high, the
buck regulator switches to a traditional constant frequency PWM
control scheme to provide low output ripple for noise sensitive
applications, and the buck regulator provides up to 300 mA of
output current in PWM mode.
GENERAL DESCRIPTION
The ADP5310 combines dual buck regulators and one load switch
in a 16-lead TSSOP_EP package that meets demanding perfor-
mance and board space requirements. The device enables direct
connection to a wide input voltage range of 2.7 V to 15.0 V, allowing
the use of multiple alkaline/NiMH or lithium cells and other
power sources.
The buck regulator in Channel 1 uses a current mode, constant
frequency pulse-width modulation (PWM) control scheme for
excellent stability and transient performance, which provides up
to 800 mA of output current. The automatic PWM/pulse skipping
mode (PSM) control scheme achieves excellent efficiency in light
output current. A power-good signal indicates that the output
of Channel 1 is within 92% of its nominal value.
Channel 3 integrates a high-side load switch that operates from
1.65 V to 5.5 V with its input connected to the output of Channel 2.
The load switch provides power domain isolation and extends
battery operation time.
Other key safety features of the ADP5310 include overcurrent
protection (OCP), thermal shutdown (TSD), and input under-
voltage lockout (UVLO). The ADP5310 is rated for the −40°C
to +125°C junction temperature range.
An ultralow power buck regulator is integrated in Channel 2 with
the SYNC/MODE pin to control its operation mode. When
SYNC/MODE is set to low, the buck regulator operates in hysteresis
Rev.
A
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www.analog.com
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