TPS61170_08 Datasheet, PDF (1/27 Pages) Texas Instruments – 1.2A High Voltage Boost Converter in 2x2mm2 QFN Package

TPS61170
www.ti.com
SLVS789A – NOVEMBER 2007 – REVISED FEBRUARY 2008
1.2A High Voltage Boost Converter in 2x2mm² QFN Package
FEATURES
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• 3-V to 18-V Input Voltage Range
• High Output Voltage: Up to 38 V
• 1.2-A integrated Switch
• 1.2-MHz Fixed Switching Frequency
• 12 V at 300 mA and 24 V at 150 mA from 5-V
Input (Typical)
• Up to 93% Efficiency
• On-The-Fly Output Voltage Reprogramming
• Skip-Switching Cycle for Output Regulation at
Light Load
• Built-in Soft Start
• 6-Pin, 2 mm × 2 mm QFN Package
APPLICATIONS
• 5-V to 12-V and 24-V, 12-V to 24-V Boost
Converter
• Buck Boost Regulation Using SEPIC Topology
• ADSL Modems
VIN 5 V
L1
10 mH
DESCRIPTION
The TPS61170 is a monolithic high voltage switching
regulator with integrated 1.2-A, 40-V power MOSFET.
It can be configured in several standard
switching-regulator topologies, including boost and
SEPIC. The device has a wide input-voltage range to
support applications with input voltage from multi-cell
batteries or regulated 5-V, 12-V power rails.
The TPS61170 uses a 1.2-MHz switching frequency,
allowing the use low-profile inductors and low-value
ceramic input and output capacitors. The external
loop compensation gives the user flexibility to
optimize loop compensation and transient response.
The device has built-in protection features, such as
pulse-by-pulse overcurrent limit, soft start and thermal
shutdown.
The feedback reference voltage of the FB pin is
1.229V. It can be lowered using a 1-wire digital
interface (Easyscale™ protocol) through the CTRL
pin. Alternatively, a pulse width-modulation (PWM)
signal can be applied to the CTRL pin. The duty cycle
of the signal reduces the feedback reference voltage
proportionally.
The TPS61170 is available in a 6-pin 2 mm × 2 mm
QFN package, allowing a compact power-supply
solution.
D1
VOUT 12 V/ 300 mA
C1
4.7 mF
C3
680 pF
R3
10 kW
TPS 61170
VIN
SW
CTRL
FB
COMP GND
R1
87.6 kW
C2
4.7 mF
R2
10 kW
L1: TOKO#A915_Y-100M
C1: Murata GRM188R61A475K
C2: Murata GRM21BR61E475K
D1: ONsemi MBR0540T1
*R3, C3: Compensation RC network
Figure 1. Typical Application
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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 © 2007–2008, Texas Instruments Incorporated