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TPS2220A Datasheet

  • TPS2220A

  • 具有串行接口的 1A 单槽 PC 卡电源开关

  • 735.73KB

  • 31页

  • TI

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TPS2220A, TPS2223A
TPS2224A, TPS2226A
SLVS428B 鈥?MAY 2002 鈥?REVISED SEPTEMBER 2004
www.ti.com
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 36, the only external
components required are: an inductor, a Schottky rectifier, an output filter capacitor, an input filter capacitor, and
a small capacitor for loop compensation. The entire converter occupies less than 0.7 in
2
of PCB space when
implemented with surface-mount components. An enable input is provided to shut the converter down and
reduce the supply current to 3 碌A 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-鈩?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 of TPS6734, is brought out for
external use. For additional information, see the TPS6734 data sheet (SLVS127).
3.3 V or 5 V
Enable
(see Note A)
R1
10 k鈩?/div>
TPS6734
EN
REF
SS
COMP
VCC
FB
OUT
GND
TPS2226A
or
TPS2224A
1
2
C1
33
碌F
20 V
+
3
4
C2
0.01
碌F
8
7
6
5
D1
33
碌F,
20 V
+
C1
L1
18
碌H
AVCC
鈥?/div>
AVCC
AVCC
AVPP
12 V
0.1
碌F
12 V
12 V
BVCC
鈥?/div>
BVCC
C4
0.001
碌F
5V
1
碌F
0.1
碌F
5V
5V
5V
BVCC
BVPP
3.3 V
4.7
碌F
0.1
碌F
3.3 V
鈥?/div>
3.3 V
3.3 V
DATA
CLOCK
LATCH
SHDN
RESET
OC
鈥?/div>
Not on TPS2224A
NOTE A: The enable terminal can be tied to a general-purpose I/O terminal on the PCMCIA controller or tied high.
Figure 36. TPS2224A and TPS2226A with TPS6734 12-V, 120-mA Supply
26

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