TPS61085_17 Datasheet, PDF (1/30 Pages) Texas Instruments – 650-kHz,1.2-MHz, 18.5-V Step-Up DC-DC Converter

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TPS61085
SLVS859B – JUNE 2008 – REVISED DECEMBER 2014
TPS61085 650-kHz,1.2-MHz, 18.5-V Step-Up DC-DC Converter
1 Features
•1 2.3 V to 6 V Input Voltage Range
• 18.5-V Boost Converter With 2.0-A Switch Current
• 650-kHz/1.2-MHz Selectable Switching Frequency
• Adjustable Soft-Start
• Thermal Shutdown
• Undervoltage Lockout
• 8-Pin VSSOP Package
• 8-Pin TSSOP Package
2 Applications
• Handheld Devices
• GPS Receivers
• Digital Still Cameras
• Portable Applications
• DSL Modems
• PCMCIA Cards
• TFT LCD Bias Supply
3 Description
The TPS61085 is a high frequency, high efficiency
DC-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 selectable frequency of 650 kHz or
1.2 MHz allows the use of small external inductors
and capacitors and provides fast transient response.
The external compensation allows optimizing the
application for specific conditions. A capacitor
connected to the soft-start pin minimizes inrush
current at startup.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS61085
VSSOP (8)
TSSOP (8)
3.00 mm × 3.00 mm
3.00 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Simplified Schematic
L
3.3 mH
V_IN
2.3 V to 6 V
C_IN
10 µF
16 V
C_BY
1 µF
16 V
6
IN
3
EN
5
SW
2
FB
7
FREQ
1
COMP
4
GND
8
SS
TPS61085
D
PMEG2010AEH
R1
158 kΩ
R2
18.2 kΩ
V_S
12 V/300 mA
C_OUT
2* 10 µF
25 V
R_COMP
51 kΩ
C_SS
100 nF
C_COMP
1.1 nF
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.