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TPS61170_08

更新时间: 2024-09-09 04:48:47
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德州仪器 - TI 转换器升压转换器
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描述
1.2A High Voltage Boost Converter in 2x2mm2 QFN Package

TPS61170_08 数据手册

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TPS61170  
www.ti.com  
SLVS789ANOVEMBER 2007REVISED FEBRUARY 2008  
2
1.2A High Voltage Boost Converter in 2x2mm QFN Package  
1
FEATURES  
DESCRIPTION  
3-V to 18-V Input Voltage Range  
High Output Voltage: Up to 38 V  
1.2-A integrated Switch  
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.  
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  
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.  
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  
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.  
L1  
10 mH  
VIN 5 V  
VOUT 12 V/ 300 mA  
D1  
C2  
4.7 mF  
C1  
4.7 mF  
TPS 61170  
R1  
87.6 kW  
VIN  
SW  
FB  
CTRL  
R3  
10 kW  
R2  
10 kW  
GND  
COMP  
C3  
680 pF  
L1: TOKO#A915_Y-100M  
C1: Murata GRM188R61A475K  
C2: Murata GRM21BR61E475K  
D1: ONsemi MBR0540T1  
*R3, C3: Compensation RC network  
Figure 1. Typical Application  
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.  
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  

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