TPS61260 Datasheet, PDF (1/21 Pages) Texas Instruments – TINY LOW INPUT VOLTAGE BOOST CONVERTER

TPS61260, TPS61261
www.ti.com
TINY LOW INPUT VOLTAGE BOOST CONVERTER
SLVSA99 – MAY 2011
FEATURES
1
•2 Up to 95% Efficiency
• More than 50 mA Output Current at 3.3 V (VIN
> 0.9 V)
• Input Voltage Range from 0.8 V to 4.0 V
• Fixed and Adjustable Output Voltage Options
from 1.8 V to 4.0 V
• Programmable Average Output Current from
10 mA to 100 mA
• Up to 700 mA Switch Current Rating
• Power Save Mode for Improved Efficiency at
Low Output Power
• Low Quiescent Current
• Dynamic Switch Current Limit
• Advanced Softstart
• Quasi Fixed Frequency Operation at 2.5 MHz
• Output Overvoltage Protection
• Load Disconnect During Shutdown
• Undervoltage Lockout
• Available in a 2 × 2 mm, 6-pin SON Package
APPLICATIONS
• All single or dual cell Alkaline, NiCd or NiMH
Battery Powered Products
• High Output Impedance Battery (Coin Cells)
Powered Products
• Personal Medical Products
• High Power LED's
• Wireless Pointing Devices
• Wireless Headsets
• Industrial Metering Equipment
DESCRIPTION
The TPS6126x devices provide a power supply solution for products powered by either single or dual cell
alkaline, NiCd or NiMH battery. Its unique advanced softstart makes it also suitable for products powered by high
output impedance battery types, like coin cells. Output currents can go as high as 100 mA while using a single
cell alkaline battery, and discharge it down to 0.8 V or lower. The boost converter is based on a quasi fixed
frequency, pulse-width-modulation (PWM) controller using synchronous rectification to obtain maximum
efficiency. At low load currents, the converter enters Power Save Mode to ensure high efficiency over a wide
load current range. The maximum average current in the switches is limited to a programmable value which can
go as high as 700 mA. The output voltage is programmable using an external resistor divider, or is fixed
internally on the chip. In addition to that the average output current can be programmed as well. The converter
will then regulate the programmed output voltage or the programmed output current which ever demands lower
output power. The converter can be disabled to minimize battery drain. During shutdown, the load is
disconnected from the battery. The device is packaged in a 6-pin SON PowerPAD™ package measuring 2 × 2
mm (DRV).
V_IN
0.8 V to 4.0 V
L₁
4.7 µH
C₁
10 µF
L
VOUT
R₁
VIN
FB
R₂
EN
GND
RI
R₃
TPS61260
C₂
10 µ F
V_OUT
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.
PowerPAD is a trademark of Texas Instruments.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2011, Texas Instruments Incorporated