TPS2214A, TPS2216A

LOW-COST DUAL-SLOT PC CARD POWER SWITCH

FOR SERIAL PCMCIA CONTROLLERS

SLVS267 – DECEMBER 1999

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 33, 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).

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

TPS2216A

BVPP

BVCC

BVCC

BVCC

AVPP

AVCC

AVCC

AVCC

RESET

LATCH

CLOCK

DATA

OC

RESET

3.3 V

5 V

12V

3.3V

5V

12V

3.3V

3.3V

5V

5V

MODE

STBY

0.1

µF

0.1

µF

1

µF

0.1

µF

1

µF

EN

REF

SS

COMP

TPS6734

VCC

FB

OUT

GND

1

2

3

4

L1

18

µH

8

7

6

5

R1

10 k

Ω

ENABLE

(see Note A)

C1

33

µF

20V

C2

0.01

µF

12 V

D1

33

µF, 20 V

C4

0.001

µF

3.3V or 5V

+

C1

+

Figure 33. TPS2216A with TPS6734 12-V, 120-mA Supply