TPS61086 Datasheet, PDF (9/26 Pages) Texas Instruments – 18.5 V PFM/PWM STEP-UP DC-DC CONVERTER WITH 2.0 A SWITCH

TPS61086
www.ti.com ................................................................................................................................................................................................ SLVSA05 – AUGUST 2009
DETAILED DESCRIPTION
V_IN
V_S
EN
IN
MODE
SW
SW
SS
Current limit
and
Soft Start
AGND
Bias Vref = 1.24 V
UVLO
Thermal Shutdown
Ton
COMP
Toff Generator
PWM
Generator
Gate Driver of
Power
Transistor
GM Amplifier
FB
Vref
PGND
Figure 17. Block Diagram
The boost converter is designed for output voltages up to 18.5 V with a switch peak current limit of 2.0 A
minimum. The device, which operates in a current mode scheme with quasi-constant frequency, is externally
compensated for maximum flexibility and stability. The switching frequency is fixed to 1.2 MHz and the minimum
input voltage is 2.3 V. To limit the inrush current at start-up a soft-start pin is available.
TPS61086 boost converter’s novel topology using adaptive off-time provides superior load and line transient
responses and operates also over a wider range of applications than conventional converters.
Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS61086
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