Internal

compensated

Error Amp.

Sawtooth

Generator

Skip Comp.Low

PWM

Comp.

Average

CurrentDetector

Skip ModeEntry

VREF

Control

Stage

GateDriver

PMOSCurrent

LimitComparator

NMOSCurrent

LimitComparator

LoadComparator

VREF-1%

FB

VOUT1

FB_VOUT

Undervoltage

Lockout

Thermal

Shutdown

Softstart

VIN

GND

MODE

Error Amp.

Sawtooth

Generator

PWM

Comp.

VREF

Control

Stage

GateDriver

PMOSCurrent

LimitComparator

NMOSCurrent

LimitComparator

LoadComparator

FB_VOUT2

Thermal

Shutdown

Softstart

VIN

GND

MODE

CLK180°

Easy Scale

Interface

CLK0°

CLK180°

2.25MHz

Oscillator

Converter1

Converter2

SW1

SW2

ADJ2

FB1

DEF1

Mode/

DATA

EN1

EN2

VIN

GND

Ext. res. network

Reference

Average

CurrentDetector

Skip ModeEntry

ACK

MOSFET

Opendrain

Internal

compensated

Skip Comp.

VREF+1%

FB_VOUT

Skip Comp.Low

VREF-1%

FB_VOUT

Skip Comp.

VREF+1%

FB_VOUT

Note1

RI1

RI..N

Int.Resistor

Network

C

ff

25pF

Register

DEF1_High

DEF1_Low

RI1

RI..N

Int.Resistor

Network

C

Register

DEF2

Note2

TPS62400-Q1, TPS62401-Q1

TPS62402-Q1, TPS62403-Q1

TPS62404-Q1

SLVSA67 – FEBRUARY 2010

www.ti.com

FUNCTIONAL BLOCK DIAGRAM

(1)

In fixed output voltage version, the PIN DEF_1 is connected to an internal digital input and disconnected from the

error amplifier

(2)

To set the output voltage of Converter 2 via EasyScale™ Interface, ADJ2 pin must be directly connected to VOUT2

6

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Product Folder Link(s) :TPS62404-Q1