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參數(shù)資料
| 型號(hào)： | US1261CM |
| 廠商： | Unisem Group |
| 英文描述： | DUAL 6A AND 1A LOW DROPOUT POSITIVE FIXED OUTPUT REGULATOR |
| 中文描述： | 雙6A和1A低壓差型正，固定輸出穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 3/6頁(yè) |
| 文件大?。?/td> | 41K |
| 代理商： | US1261CM |
US1261
3-3
Rev. 1.7
3/22/99
BLOCK DIAGRAM
PIN DESCRIPTIONS
PIN #
2
PIN SYMBOL PIN DESCRIPTION
Vout2
The output #2 (high current) of the regulator. A minimum of 100uF capacitor
must be connected from this pin to ground to insure stability.
The output #1 (low current) of the regulator. A minimum of 100uF capacitor
must be connected from this pin to ground to insure stability.
The power input pin of the regulator. Typically a large storage capacitor is
connected from this pin to ground to insure that the input voltage does not sag
below the minimum drop out voltage during the load transient response. This
pin must always be higher than both Vout pins by the amount of the dropout
voltage(see datasheet) in order for the device to regulate properly.
This pin is connected to GND. It is also the TAB of the package.
The control input pin of the regulator. This pin via a 10
resistor is connected
to the 5V supply to provide the base current for the pass transistor of both
regulators. This allows the regulator to have very low dropout voltage
which allows one to generate a well regulated 2.5V supply from the 3.3V input.
A high frequency, 1 uF capacitor is connected between this pin and Vin pin to
insure stability.
5
Vout1
4
Vin
3
1
Gnd
Vctrl
Figure 1 - Simplified block diagram of the US1261
Vctrl
Vin
Gnd
4
1
3
1261blk1-1.1
2
Vout2
5 Vout1
THERMAL
SHUTDOWN
1.20V
+
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