SW2

VIN

EN2/PWM

VO2

L2 = 10 H

m

C

OUT2

10 F

m

C

10

IN

mF

TPS62770

GND1

DC/DC 2

Step up converter

EN1

SW1

VO1

L1 = 2.2 H

m

C

10 F

OUT1

m

VOUT1 = 1.8V/300mA

DC/DC 1

Step Down Converter

CTRL

LOAD

Load Output = 1.8V

Load Switch

GND2

VSEL1

VSEL2

VSEL3

BM

ON/OFF

MCU / BLE

Sensors

FB

VOUT2 = 12V / 30mA

PMOLED

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

Reference

Design

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

TPS62770

SLVSCX0A – FEBRUARY 2016 – REVISED MARCH 2016

TPS62770 Multi-Rail DC/DC Converter For Wearable Applications

1

1 Features

1

•

VIN Range 2.5 V to 5.5 V

•

370 nA Iq Step-Down Converter

–

8 Selectable Output Voltages (1.0V to 3.0V)

–

300 mA Output Current

–

Output Discharge Function

•

Slew Rate Controlled Load Switch with Discharge

Function

•

Dual Mode Step-Up Converter

–

Load Disconnect

–

Constant Output Voltage Adjustable up to 15 V

–

LED Current Driver with PWM to Current

100%)

•

Tiny 16pin 1.58 x 1.58mm WCSP Package 0.4mm

pitch

2 Applications

•

Wearable and Personal Electronics

•

Fitness Accessories

•

Health Monitoring and Medical Accessories

3 Description

The TPS62770 is a tiny power solution for wearable

applications including a 370nA ultra low Iq step-down

converter, a slew rate controlled load switch and a

dual mode step-up converter. The output voltage of

the step-down converter can be selected with three

VSEL pins between 1.0 V, 1.05 V, 1.1 V, 1.2 V, 1.8

V, 1.9 V, 2.0 V and 3.0 V. The output voltage can be

changed during operation. In shutdown mode, the

output of the step-down converter is pulled to GND.

The integrated load switch is internally connected to

the output of the step-down converter and features

slew rate control during turn on phase. Once turned

off, its output is connected to GND.

The dual mode step-up converter can generate a

constant output voltage up to 15 V, such as PMOLED

supply; or, a constant output current, such as LED

back light supply. The output voltage can be adjusted

up to 15 V with external resistors, or set to fixed 12 V

by connecting the FB pin to VIN. The device features

an internal over voltage protection of 17.7 V in case

the FB node is left open or tight to GND. It includes

an internal rectifier and load disconnect function.

When used as constant output current driver, the

device offers a PWM to analog converter to scale

down the reference voltage according to the duty

cycle of the PWM signal.

The device is available in a small 16pin 0.4mm pitch

WCSP package.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

TPS62770

DSBGA (16)

1.58mm x 1.58mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Typical Application Schematic