TPS2836, TPS2837

SYNCHRONOUSBUCK MOSFET DRIVER

WITH DEADTIME CONTROL

SLVS224B − NOVEMBER 1999 − REVISED AUGUST 2002

10

POST OFFICE BOX 655303

APPLICATION INFORMATION

Figure 17 shows the circuit schematic of a 100-kHz synchronous-buck converter implemented with a TL5001A

pulse-width-modulation (PWM) controller and a TPS2837 driver. The converter operates over an input range from

4.5 V to 12 V and has a 3.3-V output. The circuit can supply 3 A continuous load and the transient load is 5 A. The

C14

1

µF

R9

90.9 k

Ω

R8

121 k

Ω

C9

0.22

µF

VCC

RT

FB

COMP

GND

OUT

DTC

SCP

U2

TL5001A

1

2

6

5

8

3

4

7

C1

1

µF

R10

1.0 k

Ω

R2

1.6 k

Ω

C2

0.033

µF

C3

0.0022

µF

C8

0.1

µF

C4

0.022

µF

R3

180

Ω

R4

2.32 k

Ω

GND

Q2

Si4410

R7

3.3

Ω

C6

1000 pF

VIN

C5

100

µF

C10

100

µF

C11

0.47

µF

3.3 V

C13

10

µF

C7

100

µF

C12

100

µF

Q1

Si4410

L1

27

µH

U1

TPS2837

R1

1 k

Ω

C15

1.0

µF

R5

0

Ω

R11

4.7

Ω

RTN

PGND

LOWDR

BOOTLO

HIGHDR

BOOT

IN

DT

VCC

1

2

3

4

8

7

6

5

+

+

+

+

R6

1 M

Ω

Figure 17. 3.3 V 3 A Synchronous-Buck Converter Circuit