0.001

0.01

0.1

1

10

100

1000

50%

55%

60%

65%

70%

75%

80%

85%

90%

95%

100%

D006

VIN = 3.6 V

VIN = 4.2 V

VIN = 5.0 V

VIN

EN

VSEL

SW

VOS

L 2.2 PH

4.7 PF

2.0V to 5.5V

Low Power

MCU & RF

TPS62748

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LOAD

10 PF

GND

Sensor

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TPS62748

SLVSD37A – SEPTEMBER 2015 – REVISED OCTOBER 2015

TPS62748 300 mA High Efficiency Buck Converter with Ultra-low Quiescent Current and

Load Switch

1 Features

3 Description

The TPS62748 is a high efficiency step down

1

•

converter with ultra low quiescent current of typical

•

Input Voltage Range Down to 2.0 V Once Started

360 nA. The device is optimized to operate with a

•

300 mA Output Current

2.2-µH inductor and 10µF output capacitor. The

device uses DCS-Control™ and operates with a

•

360 nA Operational Quiescent Current

typical switching frequency of 1.2 MHz. In Power

•

Up to 90% Efficiency at 10-µA Output Current

Save Mode the device extends the light load

•

Power Save Mode Operation

efficiency down to a load current range of 10-µA and

below. TPS62748 provides an output current of 300

•

Selectable Output Voltages

mA. Once started the device operates down to an

–

1.2 V and 1.8 V

input voltage range of 2.0 V. This allows to operate

•

Output Voltage Discharge

•

100 mA/2.2

Ω Integrated Load Switch

The TPS62748 provides two programmable output

•

Low Output Voltage Ripple

voltages of 1.2V and 1.8V selectable by one voltage

•

Automatic Transition to No Ripple 100% Mode

select pin. The TPS62748 is optimized to provide a

low output voltage ripple and low noise using a small

•

RF Friendly DCS-Control™

output capacitor. Once the input voltage comes close

•

to the output voltage the device enters the No Ripple

•

Small 1.6 mm × 0.9 mm, 8 Ball WCSP Package

100% mode to prevent an increase of output ripple

voltage. In this operation mode the device stops

2 Applications

switching and turns the high side MOSFET switch on.

•

Wearables

The TPS62748 has a 100 mA load switch between

pins VOS and LOAD with a typical ON-resistance of

•

Fitness Tracker

0.6 Ohm. The load switch is typically used to

•

Smart Watch

distribute the buck converter output voltage to the

•

Health Monitoring

sub-system.

•

Device Information(1)

•

High-efficiency, Ultra Low Power Applications

PART NUMBER

PACKAGE

BODY SIZE (NOM)

•

Energy Harvesting

TPS62748

DSBGA (8)

1.6 mm × 0.9 mm

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

the end of the datasheet.

4 Typical Application

1

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.