TPS61086 Datasheet, PDF (1/26 Pages) Texas Instruments – 18.5 V PFM/PWM STEP-UP DC-DC CONVERTER WITH 2.0 A SWITCH

TPS61086
Actual Size
3 mm x 3 mm
www.ti.com ................................................................................................................................................................................................ SLVSA05 – AUGUST 2009
18.5 V PFM/PWM STEP-UP DC-DC CONVERTER WITH 2.0 A SWITCH
FEATURES
1
• 2.3 V to 6.0 V Input Voltage Range
• 18.5 V Boost Converter With 2.0 A Switch
Current
• 1.2 MHz Switching Frequency
• Power Save Mode for improved Efficiency at
Low Output Power or Forced PWM
• Adjustable Soft-Start
• Thermal Shutdown
• Undervoltage Lockout
• 10-Pin QFN Package
APPLICATIONS
• Handheld Devices
• GPS Receiver
• Digital Still Camera
• Portable Applications
• DSL Modem
• PCMCIA Card
• TFT LCD Bias Supply
DESCRIPTION
The TPS61086 is a high frequency, high efficiency DC to DC converter with an integrated 2.0 A, 0.13 Ω power
switch capable of providing an output voltage up to 18.5 V. The implemented boost converter is based on a fixed
frequency of 1.2MHz, pulse-width-modulation (PWM) controller that allows the use of small external inductors
and capacitors and provides fast transient response.
At light load, the device can operate in Power Save Mode with pulse-frequency-modulation (PFM) to improve the
efficiency while keeping a low output voltage ripple. For very noise sensitive applications, the device can be
forced to PWM Mode operation over the entire load range by pulling the MODE pin high. The external
compensation allows optimizing the application for specific conditions. A capacitor connected to the soft-start pin
minimizes inrush current at startup.
L
3.3 mH
V_IN
2.5 V to 6 V
Cin
10 mF
16 V
Cby
1 mF
16 V
8
IN
3 _EN
SW ⁶
7
SW
9 _MODE
4 _AGND
5 _PGND
2
FB
COMP ¹
SS ¹⁰
TPS61086
D
PMEG2010AEH
R1
156 kW
Css
100 nF
Rcomp
68 kW
Ccomp
820 pF
R2
18 kW
V_S
12 V
Cout
2* 10 mF
25 V
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 © 2009, Texas Instruments Incorporated