TPS65266_16 Datasheet, PDF (12/41 Pages) Texas Instruments – 2.7- to 6.5-V Input Voltage, 3-A/2-A/2-A Output Current Triple Synchronous Step-Down Converter

TPS65266
SLVSCT9B – NOVEMBER 2014 – REVISED JANUARY 2015
7 Detailed Description
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7.1 Overview
The TPS65266 is a triple 3-A/2-A/2-A output current, synchronous step-down (buck) converter for applications
operating off the adaptor or battery with input voltage lower than 6.5 V. The feedback voltage reference for each
buck is 0.6 V. Each buck is independent with dedicated enable, soft-start, and loop compensation. The
TPS65266 implements a constant frequency, peak current mode control that simplifies external loop
compensation. The switch clock of buck1 is 180° out-of-phase operation from the clock of buck2 and buck3
channels to reduce input current ripple, input capacitor size and power-supply-induced noise.
The TPS65266 has been designed for safe monotonic startup into prebiased loads. The default start-up is when
VIN is typically 2.45 V. The ENx pin has an internal pullup current source that can be used to adjust the input
voltage undervoltage lockout (UVLO) with two external resistors. In addition, the EN pin can be floating for
automatically starting up the converters with the internal pullup current.
The TPS65266 features PGOOD pin to supervise output voltages of buck converter. The TPS65266 has power-
good comparators with hysteresis, which monitor the output voltages through internal feedback voltages. When
all bucks are in regulation range and power sequence is done, PGOOD is asserted high.
The SS (soft-start/tracking) pin is used to minimize inrush currents or provide power-supply sequencing during
power up. A small-value capacitor or resistor divider should be coupled to the pin for soft start or critical power-
supply sequencing requirements.
The TPS65266 is protected from overload and thermal fault conditions.
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