I

With TPS62730

BAT

15

17

19

21

23

25

27

29

2

2.2

2.4

2.6

2.8

3

3.2

3.4

3.6

3.8

Battery Voltage - V

BAT

Battery Current

Reduction @

CC2540

0dBm CW TX

Power

Battery Current Reduction of CC2540

2.4GHz Bluetooth Low Energy

System-On-Chip Solution

I

NO TPS62730

BAT

TPS62730

VIN

ON/BYP

STAT

GND

VOUT

SW

V

2.1V

OUT

V

2.2V - 3.9V*

IN

C

2.2

IN

µF

C

2.2

OUT

µF

L 2.2 H

m

ON

BYP

* At V < 2.2V, V

tracks V

IN

OUT

IN

R

pullup

TPS62732, TPS62733

TPS62730

www.ti.com

SLVSAC3C – MAY 2011 – REVISED DECEMBER 2012

Step Down Converter with Bypass Mode for Ultra Low Power Wireless Applications

Check for Samples: TPS62732, TPS62733, TPS62730

1

FEATURES

DESCRIPTION

The TPS62730 is a high frequency synchronous step

2

•

down DC-DC converter optimized for ultra low power

•

Typ. 30 nA Ultra Low Power Bypass Mode

wireless applications. The device is optimized to

•

Typ. 25

μA DC/DC Quiescent Current

supply TI's Low Power Wireless sub 1GHz and

2.4GHz

RF

transceivers

and

System-On-Chip-

•

Internal Feedback Divider Disconnect

solutions.

The

TPS62730

reduces

the

current

•

Typ. 2.1

consumption drawn from the battery during TX and

•

Automatic Transition from DC/DC to Bypass

RX mode by a high efficient step down voltage

Mode

conversion. It provides up to 100mA output current

and allows the use of tiny and low cost chip inductors

•

Up To 3MHz switch frequency

and capacitors. With an input voltage range of 1.9V to

•

Up to 95% DC/DC Efficiency

3.9V

the

device

supports

Li-primary

battery

•

Open Drain Status Output STAT

chemistries such as Li-SOCl2, Li-SO2, Li-MnO2 and

also two cell alkaline batteries.

•

Output Peak Current up to 100mA

•

Fixed Output Voltages 1.9V, 2.05V, 2.1V, 2.3V

The TPS62730 features an Ultra Low Power bypass

mode with typical 30nA current consumption to

•

Small External Output Filter Components

support sleep and low power modes of TI's CC2540

2.2

μH/ 2.2μF

Bluetooth Low Energy and CC430 System-On-Chip

•

Optimized For Low Output Ripple Voltage

solutions. In this bypass mode, the output capacitor

•

of

the

DC/DC

converter

is

connected

via

an

integrated typ. 2.1

Ω Bypass switch to the battery.

•

In DC/DC operation mode the device provides a fixed

APPLICATIONS

output voltage to the system. With a switch frequency

up to 3MHz, the TPS62730 features low output ripple

•

CC2540 Bluetooth™ Low Energy

voltage and low noise even with a small 2.2uF output

System-On-Chip Solution

capacitor. The automatic transition into bypass mode

•

Low Power Wireless Applications

during DC/DC operation prevents an increase of

output ripple voltage and noise once the DC/DC

•

RF4CE, Metering

converter operates close to 100% duty cycle. The

device automatically enters bypass mode once the

battery voltage falls below the transition threshold

2

6 pin QFN package.

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

Bluetooth is a trademark of Bluetooth SIG.

UNLESS

OTHERWISE

NOTED

this

document

contains

Copyright © 2011–2012, Texas Instruments Incorporated

PRODUCTION DATA information current as of publication date.

Products conform to specifications per the terms of Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.