TPS43060_15 datasheet(11/43 Pages) TI

Part #	TPS43060

Description	TPS4306x Low Quiescent Current Synchronous Boost DC-DC Controller With Wide VIN Range

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Manufacturer	TI [Texas Instruments]

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TPS43060, TPS43061

www.ti.com

SLVSBP4D – DECEMBER 2012 – REVISED SEPTEMBER 2014

8 Detailed Description

8.1 Overview

The TPS4306x is a high-performance, wide-input range synchronous boost controller that accepts a 4.5 to 38 V

(40-V absolute max) input and support output voltages up to 58 V. The devices have gate drivers for both the

low-side N-channel MOSFET and the high-side synchronous rectifier N-channel MOSFET. Voltage regulation is

achieved employing constant frequency current mode pulse-duration modulation (PWM) control. The switching

frequency is set either by an external timing resistor or by synchronizing to an external clock signal. The

switching frequency is programmable from 50 kHz to 1 MHz in the resistor programmed mode or can be

synchronized to an external clock between 300 kHz to 1 MHz.

The PWM control circuitry turns on the low-side MOSFET at the beginning of each oscillator clock cycle, as the

error amplifier compares the output voltage feedback signal at the FB pin to the internal 1.22-V reference

voltage. The low-side MOSFET is turned-off when the inductor current reaches a threshold level set by the error

amplifier output. After the low-side MOSFET is turned off, the high-side synchronous MOSFET is turned on until

the beginning of the next oscillator clock cycle or until the inductor current reaches the reverse current sense

threshold. The input voltage is applied across the inductor and stores the energy as inductor current ramps up

during the portion of the switching cycle when the low-side MOSFET is on. Meanwhile, the output capacitor

supplies load current. When the low-side MOSFET is turned off by the PWM controller, the inductor transfers

stored energy with the synchronous MOSFET to replenish the output capacitor and supply the load current. This

operation repeats every switching cycle.

The devices feature internal slope compensation to avoid subharmonic oscillation that is intrinsic to peak current

mode control at duty cycles higher than 50%. They also feature adjustable soft-start time, optional lossless

inductor DCR current sensing, an output power good indicator, cycle-by-cycle current limit, and overtemperature

protection.

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