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參數(shù)資料
| 型號： | TPS79028DBVR |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | THREE-TERMINAL POSITIVE FIXED VOLTAGE REGULATORS |
| 中文描述： | 三端固定電壓調(diào)節(jié)器 |
| 文件頁數(shù)： | 3/16頁 |
| 文件大小： | 280K |
| 代理商： | TPS79028DBVR |
TPS79015, TPS79018, TPS79025, TPS79028, TPS79030
ULTRALOW-POWER LOW-NOISE 50 mA
LOW-DROPOUT LINEAR REGULATORS
SLVS299A – SEPTEMBER 2000 – REVISED SEPTEMBER 2000
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detail description
The TPS790xx 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 TPS790xx is essentially constant from no load to maximum load.
The TPS790xx family of low-dropout (LDO) regulators have been optimized for use in battery-operated
equipment. They feature extremely low dropout voltages, low output noise, low quiescent current (17
μ
A
typically), and enable inputs to reduce supply currents to 1
μ
A when the regulators are turned off.
The internal voltage reference is a key source of noise in a LDO regulator. The TPS790xx has a BYPASS pin
which is connected to the voltage reference through a 150-k
internal resistor. The 150-k
internal resistor,
in conjunction with an external bypass capacitor connected to the BYPASS pin, creates a low pass filter to
reduce the voltage reference noise and, therefore, the noise at the regulator output. Note that the output will
start up slower as the bypass capacitance increases due to the RC time constant at the bypass pin that is created
by the internal 150-k
resistor and external capacitor.
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 TPS790xx 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 TPS790xx 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.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Input voltage range
Voltage range at EN
Voltage on OUT, FB
Peak output current
ESD rating, HBM
Continuous total power dissipation
Operating virtual junction temperature range, T
J
Storage temperature range, T
stg
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: All voltage values are with respect to network ground terminal.
–0.3 V to 13.5 V
–0.3 V to V
I
+ 0.3 V
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7 V
Internally limited
2 kV
See Dissipation Rating Table
–40
°
C to 150
°
C
–65
°
C to 150
°
C
DISSIPATION RATING TABLE
TA
≤
25
°
C
POWER RATING
PACKAGE
DERATING FACTOR
ABOVE TA = 25
°
C
3.5 mW/
°
C
3.5 mW/
°
C
TA = 70
°
C
POWER RATING
TA = 85
°
C
POWER RATING
Recommended
DBV
350 mW
192 mW
140 mW
Absolute maximum
DBV
437 mW
280 mW
227 mW
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS79028DBVRG4 | 功能描述:低壓差穩(wěn)壓器 - LDO Low-Noise 50-mA 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(diào)節(jié):0.3 % 輸出端數(shù)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 |
| TPS79028DBVT | 功能描述:低壓差穩(wěn)壓器 - LDO Low-Noise 50-mA 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(diào)節(jié):0.3 % 輸出端數(shù)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 |
| TPS79028DBVT | 制造商:Texas Instruments 功能描述:IC LDO REG 2.8V 50MA SOT-23-5 制造商:Texas Instruments 功能描述:IC, LDO REG 2.8V 50MA SOT-23-5 制造商:Texas Instruments 功能描述:IC, LDO REG 2.8V 50MA SOT-23-5; Primary Input Voltage:10V; Output Voltage Fixed:2.8V; Dropout Voltage Vdo:60mV; Voltage Regulator Case Style:SOT-23; No. of Pins:5; Output Current:50mA; Operating Temperature Min:-40C; Operating ;RoHS Compliant: Yes |
| TPS79028DBVTG4 | 功能描述:低壓差穩(wěn)壓器 - LDO Low-Noise 50-mA 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(diào)節(jié):0.3 % 輸出端數(shù)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 |
| TPS79030DBVR | 功能描述:低壓差穩(wěn)壓器 - LDO 50mA 3V 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(diào)節(jié):0.3 % 輸出端數(shù)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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