TPS61120 Datasheet, PDF (1/25 Pages) Texas Instruments – SYNCHRONOUS BOOST CONVERTER WITH 1.1A SWITCH AND INTEGRATED LDO

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Actual Size
(5,0 mm x 6,4 mm)
Actual Size
(4,15 mm x 4,15 mm)
TPS61120
TPS61122, TPS61121
SLVS427C – JUNE 2002 – REVISED APRIL 2004
SYNCHRONOUS BOOST CONVERTER WITH 1.1A SWITCH AND INTEGRATED LDO
FEATURES
• Synchronous, 95% Efficient, Boost Converter
With 500-mA Output Current From 1.8-V Input
• Integrated 200-mA Reverse Voltage Protected
LDO for DC/DC Output Voltage Post Regu-
lation or Second Output Voltage
• 40-µA (Typical) Total Device Quiescent Cur-
rent
• Input Voltage Range: 1.8-V to 5.5-V
• Fixed and Adjustable Output Voltage Options
up to 5.5-V
• Power Save Mode for Improved Efficiency at
Low Output Power
• Low Battery Comparator
• Power Good Output
• Low EMI-Converter (Integrated Antiringing
Switch)
• Load Disconnect During Shutdown
• Overtemperature Protection
• Available in a Small 4mm x 4mm QFN-16 or in
a TSSOP-16 Package
APPLICATIONS
• All Single Cell Li or Dual Cell Battery or USB
Powered Products as MP-3 Player, PDAs, and
Other Portable Equipment
• Dual Input or Dual Output Mode
• Simple Li-Ion to 3.3-V Conversion
10 mH
Battery
10 mF
VBAT
LBI
SWN
SWP
VOUT
TPS61120
FB
V_out1
100 mF
Control
Inputs
OFF
OFF
OFF
ON
SKIPEN
ON
EN
ON
LDOEN
PGOOD
LBO
LDOIN
LDOOUT
LDOSENSE
GND PGND
Control
Outputs
V_out2
2.2 mF
DESCRIPTION
The TPS6112x devices provide a complete power
supply solution for products powered by either a
one-cell Li-Ion or Li-Polymer or a two up to 4 cells
Alkaline, NiCd or NiMH batteries. The devices can
generate two stable output voltages that are either
adjusted by an external resistor divider or fixed
internally on the chip. It also provides a simple
solution for generating 3.3 V out of a one-cell Li-Ion
or Li-Polymer battery at a maximum output current of
at least 200 mA with supply voltages down to 1.8 V.
The implemented boost converter is based on a fixed
frequency, pulse-width-modulation (PWM) controller
using a synchronous rectifier to obtain maximum
efficiency. The maximum peak current in the boost
switch is limited to a value of 1600 mA.
The converter can be disabled to minimize battery
drain. During shutdown, the load is completely dis-
connected from the battery. A low-EMI mode is
implemented to reduce ringing and in effect lower
radiated electromagnetic energy when the converter
enters the discontinuous conduction mode. A power
good output at the boost stage simplifies control of
any connected circuits like cascaded power supply
stages or microprocessors.
The built-in LDO can be used for a second output
voltage derived either from the boost output or
directly from the battery. The LDO can be enabled
separately i.e., using the power good of the boost
stage. The device is packaged in a 16-pin QFN
package measuring 4 mm x 4 mm (RSA) or in a
16-pin TSSOP (PW) package.
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.
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 © 2002–2004, Texas Instruments Incorporated