3-Channel, Integrated Ultralow Power Solution

with Dual Buck Regulators and Load Switch

Data Sheet

ADP5310

FEATURES

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

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

TYPICAL APPLICATION CIRCUIT

SW1

PGND1

FB1

R1

R2

C3

10µF

MLCC

L1

4.7µH

SW2

PGND2

FB2

C4

10µF

MLCC

L2

4.7µH

VOUT3

ADP5310

EN1

FROM MCU

PWRGD

TO MCU

FROM MCU

PVIN1

PVIN2

NC

EN3

SYNC/

MODE

CHANNEL 1

BUCK

REGULATOR

(800mA)

CHANNEL 3

LOAD

SWITCH

CHANNEL 2

ULTRALOW

POWER

BUCK

REGULATOR

(50mA/300mA)

C1

10µF

MLCC

2.7V TO 15V

AGND

VREG

C6

1µF

C5

220nF

MLCC

Figure 1.

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.

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

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.

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.

Rev. A

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