TPS2206

DUALSLOT PC CARD POWERINTERFACE SWITCH

WITH RESET FOR SERIAL PCMCIA CONTROLLER

SLVS138D − MAY 1996 − REVISED JANUARY 2001

24

POST OFFICE BOX 655303

APPLICATION INFORMATION

12-V flash memory supply

The TPS6734 is a fixed 12-V output boost converter capable of delivering 120 mA from inputs as low as

2.7 V. The device is pin-for-pin compatible with the MAX734 regulator and offers the following advantages: lower

supply current, wider operating input-voltage range, and higher output currents. As shown in Figure 1, the only

external components required are: an inductor, a Schottky rectifier, an output filter capacitor, an input filter

space when implemented with surface-mount components. An enable input is provided to shut the converter

down and reduce the supply current to 3

µA when 12 V is not needed.

The TPS6734 is a 170-kHz current-mode PWM ( pulse-width modulation) controller with an n-channel MOSFET

power switch. Gate drive for the switch is derived from the 12-V output after start-up to minimize the die area

needed to realize the 0.7-

Ω MOSFET and improve efficiency at input voltages below 5 V. Soft start is

accomplished with the addition of one small capacitor. A 1.22-V reference (pin 2) is brought out for external use.

For additional information, see the TPS6734 data sheet (SLVS127).

DATA

CLOCK

LATCH

AVCC

AVCC

AVCC

BVCC

BVCC

BVCC

AVPP

AVPP

BVPP

BVPP

3.3V

3.3 V

To CPU

OC

5V

5 V

GND

3.3V

5V

3.3V

5V

12V

12V

TPS2206

RESET

RESET

33

µF

33

µF

0.1

µF

0.1

µF

VCC

FB

OUT

GND

EN

REF

SS

COMP

1

2

3

4

8

7

6

5

TPS6734

3.3 V or 5 V

ENABLE

(see Note A)

+

33

µF, 20 V

L1

18

µH

12 V

C5

D1

U1

C4 0.001

µF

+

C1

C2

0.01

µF

R1

10 k

Ω

33

µF, 20 V

NOTE A: The enable terminal can be tied to a generall purpose I/O terminal on the PCMCIA controller or tied high.

Figure 34. TPS2206 with TPS6734 12-V, 120-mA Supply