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參數資料
| 型號： | TPS2421-1DDAR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | PLATSIC, SOP-8 |
| 文件頁數： | 22/24頁 |
| 文件大?。?/td> | 1297K |
| 代理商： | TPS2421-1DDAR |
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www.ti.com
SLUS907D – JANUARY 2009 – REVISED AUGUST 2010
EN: When this pin is pulled low, the device is enabled. The input threshold is hysteretic, allowing the user to
program a startup delay with an external RC circuit. EN is pulled to VIN by a 10-M resistor, pulled to GND by
16.8 M
and is clamped to ground by a 7-V Zener diode. Because high impedance pullup/down resistors are
used to reduce current draw, any external FET controlling this pin should be low leakage.
If EN is tied to GND at startup and VIN does not ramp quickly the TPS2421 may momentarily turn off then on
during startup. This can happen if a capacitive load momentarily pulls down the input voltage below the UV
threshold. If necessary, this can be avoided by delaying EN assertion until VIN is fully up.
VIN: Input voltage to the TPS2421. The recommended operating voltage range is 3 V to 20 V. All VIN pins should
be connected together and to the power source.
VOUT: Output connection for the TPS2421. When switched on the output voltage will be approximately:
(4)
All VOUT pins should be connected together and to the load.
PG: Active low, Open Drain output, Power Good indicates that there is no fault condition and the output voltage
is within 0.5 V of the input voltage. PG becomes operational before UV, whenever VIN is greater than 1 V.
Copyright 2009–2010, Texas Instruments Incorporated
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