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參數資料
| 型號： | TPS77028DBV |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS |
| 中文描述： | 超低功耗50 mA的低壓降線性穩壓器 |
| 文件頁數： | 11/16頁 |
| 文件大小： | 230K |
| 代理商： | TPS77028DBV |
TPS77001, TPS77012, TPS77015, TPS77018, TPS77025
TPS77027, TPS77028, TPS77030, TPS77033, TPS77050
ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS
SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999
11
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
The TPS770xx family of low-dropout (LDO) regulators have been optimized for use in battery-operated
equipment. They feature extremely low dropout voltages, low quiescent current (17
μ
A nominally), and enable
inputs to reduce supply currents to less than 1
μ
A when the regulators are turned off.
device operation
The TPS770xx uses a PMOS pass element to dramatically reduce both dropout voltage and supply current over
more conventional PNP-pass-element LDO designs. The PMOS pass element is a voltage-controlled device
and, unlike a PNP transistor, it does not require increased drive current as output current increases. Supply
current in the TPS770xx is essentially constant from no load to maximum load.
Current limiting and thermal protection prevent damage by excessive output current and/or power dissipation.
The device switches into a constant-current mode at approximately 350 mA; further load reduces the output
voltage instead of increasing the output current. The thermal protection shuts the regulator off if the junction
temperature rises above approximately 165
°
C. Recovery is automatic when the junction temperature drops
approximately 25
°
C below the high temperature trip point. The PMOS pass element includes a back gate diode
that conducts reverse current when the input voltage level drops below the output voltage level.
A voltage of 1.7 V or greater on the EN input will disable the TPS770xx internal circuitry, reducing the supply
current to 1
μ
A. A voltage of less than 0.9 V on the EN input will enable the TPS770xx and will enable normal
operation to resume. The EN input does not include any deliberate hysteresis, and it exhibits an actual switching
threshold of approximately 1.5 V.
A typical application circuit is shown in Figure 21.
C1
1
μ
F
TPS77012,
TPS77028, TPS77030, TPS77033, TPS77050 (fixed-voltage options).
TPS77015,
TPS77018,
TPS77025,
TPS77027,
NC/FB
OUT
1
3
IN
EN
GND
2
4
5
VI
ESR = 0.2
VO
4.7
μ
F
+
TPS770xx
Figure 21. Typical Application Circuit
相關PDF資料 |
PDF描述 |
|---|---|
| TPS77025DBV | ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS |
| TPS77027DBV | ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS |
| TPS77001DBV | ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS |
| TPS77012DBV | ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS |
| TPS77015DBV | ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS |
相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS77028DBVR | 功能描述:低壓差穩壓器 - LDO 2.8V 50mA LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS77028DBVRG4 | 功能描述:低壓差穩壓器 - LDO Ultra Low-Power 50-mA LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS77028DBVT | 功能描述:低壓差穩壓器 - LDO 2.8V 50mA LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS77028DBVTG4 | 功能描述:低壓差穩壓器 - LDO Ultra Low-Power 50-mA LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS77030DBVR | 功能描述:低壓差穩壓器 - LDO 3.0V 50mA LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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