參數(shù)資料
型號(hào): TPS2204APWPG4
廠商: TEXAS INSTRUMENTS INC
元件分類: 電源管理
英文描述: 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO24
封裝: GREEN, PLASTIC, HTSSOP-24
文件頁(yè)數(shù): 18/37頁(yè)
文件大?。?/td> 1004K
代理商: TPS2204APWPG4
TPS2204A
TPS2206A
TPS2210A
SLVS449A DECEMBER 2002 REVISED MAY 2003
www.ti.com
25
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 in2 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
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-
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).
NOTE A:
The enable terminal can be tied to a general-purpose I/O terminal on the PCMCIA controller or tied high.
TPS2206A
BVPP
BVCC
AVPP
AVCC
LATCH
CLOCK
DATA
OC
RESET
3.3 V
5 V
12 V
3.3 V
5 V
12 V
3.3 V
5 V
SHDN
0.1
F
0.1
F
1
F
0.1
F
4.7
F
EN
REF
SS
COMP
TPS6734
VCC
FB
OUT
GND
1
2
3
4
L1
18
H
8
7
6
5
R1
10 k
Enable
(see Note A)
C1
33
F
20 V
C2
0.01
F
12 V
D1
33
F, 20 V
C4
0.001
F
3.3 V or 5 V
+
C1
+
Figure 38. TPS2206A With TPS6734 12-V, 120-mA Supply
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