TPS657051_15 Datasheet, PDF (12/26 Pages) Texas Instruments – PMU for Embedded Camera Module

TPS657051, TPS657052
SLVSA08A – FEBRUARY 2010 – REVISED SEPTEMBER 2015
8 Detailed Description
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8.1 Overview
The TPS65705x integrates fixed-output voltage, two highly efficient step-down converters, along with an LDO.
Each regulator has dedicated input pins for easy control.
8.2 Functional Block Diagram
10 mF
VCC
VIN1
MODE
EN1
PGND
VIN2
EN2
PGND
TPS657051/52
DCDC1
400 mA
2. 2 mH
L1
FB 1
2 .25 MHz
Oscillator
CLK 0°
CLK 180 °
L2 ^{2. 2 mH}
DCDC2
400 mA
FB 2
10 mF
Vout1
10 mF
Vout2
VINLDO
ENLDO
AGND
LDO
200 mA
VLDO
Vout3
2 .2 mF
8.3 Feature Description
8.3.1 DC-DC Converter
The TPS65705x step-down converter operates with typically 2.25-MHz fixed-frequency pulse width modulation
(PWM) at moderate to heavy load currents. With MODE pin set to low, at light load currents the converter can
automatically enter Power Save Mode and operates then in PFM mode.
During PWM operation the converter use a unique fast response voltage mode control scheme with input voltage
feed-forward to achieve good line and load regulation allowing the use of small ceramic input and output
capacitors. At the beginning of each clock cycle initiated by the clock signal, the high-side MOSFET switch is
turned on. The current flows now from the input capacitor through the high-side MOSFET switch through the
inductor to the output capacitor and load. During this phase, the current ramps up until the PWM comparator trips
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