XCON

VBST1

DRVH1

SW1

DRVL1

GND

VREG5

VREG5

GND

Control

Logic

PGOOD1

GND

Delay

+

+

+

+

1V +5%/ 10%

1V - 5%/ 10%

1V -30%

1V +15%

+

PWM

Skip

Ramp

Comp

+

+

VFB1

COMP1

EN1

Enable/

Soft-start

1V

+

CSN1

CSP1

TRIP

Discharge

Control

GND

100mV

+

V5SW

4.7V/ 4.5V

GND

VREG5

+

VREF2

GND

GND

1.25V

GND

1.25V

GND

+

VREG3

+

4.7V/ 4.5V

VIN

EN

+

4.2V/ 3.8V

150/ 140

Deg-C

V5OK

THOK

Ready

+

SKIPSEL1

FUNC

OSC

RF

CLK1

CLK2

Fault1

SDN1

UVP

OVP

Fault2

SDN2

Ready

GND

Channel-1 Switcher shown

+

VREF2

D-CAP

CUR

CLK1

VREF2

+

OCP

Ramp

Comp

+

N-OCP

100mV

OOA

Ctrl

+

VFB-AMP

CS-AMP

Clamp (+)

Clamp (-)

AZC

TPS51220A

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

FUNCTIONAL BLOCK DIAGRAM

2

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