參數(shù)資料
型號(hào)： TPS77615PWPRG4
廠商： Texas Instruments, Inc.
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： FAST-TRANSIENT-RESPONSE 500mA LOW-DROPOUT VOLTAGE REGULATORS
中文描述： 快速瞬態(tài)響應(yīng)500mA的低壓差電壓調(diào)節(jié)器
文件頁(yè)數(shù)： 13/28頁(yè)
文件大?。?/td> 791K
代理商： TPS77615PWPRG4
www.ti.com
APPLICATION INFORMATION
Minimum Load Requirements
The TPS775xx and TPS776xx families are stable at zero load; no minimum load is required for operation.
FB—Pin Connection (Adjustable Version Only)
The FB pin is an input pin to sense the output voltage and close the loop for the adjustable option. The output
voltage is sensed through a resistor divider network to close the loop as it is shown in
Figure 25
. Normally, this
connection should be as short as possible; however, the connection can be made near a critical circuit to
improve performance at that point. Internally, FB connects to a high-impedance wide-bandwidth amplifier and
noise pickup feeds through to the regulator output. Routing the FB connection to minimize/avoid noise pickup is
essential.
External Capacitor Requirements
An input capacitor is not usually required; however, a ceramic bypass capacitor (0.047
μ
F or larger) improves
load transient response and noise rejection if the TPS775xx or TPS776xx are located more than a few inches
from the power supply. A higher-capacitance electrolytic capacitor may be necessary if large (hundreds of
milliamps) load transients with fast rise times are anticipated.
IN
IN
EN
GND
OUT
OUT
RESET/
PG
6
7
5
16
14
13
3
+10 F
m
C
OUT
RESET/PG
V
OUT
V
IN
C
0.1 F
m
1
250k
W
TPS775xx, TPS776xx
SLVS232I–SEPTEMBER 1999–REVISED AUGUST 2007
The TPS775xx and TPS776xx feature very low quiescent current, which remains virtually constant even with
varying loads. Conventional LDO regulators use a pnp pass element, the base current of which is directly
proportional to the load current through the regulator (I
B
= I
C
/
β
). The TPS775xx and TPS776xx use a PMOS
transistor to pass current; because the gate of the PMOS is voltage driven, operating current is low and
invariable over the full load range.
Another pitfall associated with the pnp-pass element is its tendency to saturate when the device goes into
dropout. The resulting drop in
β
forces an increase in I
B
to maintain the load. During power up, this I
B
increase
translates to large start-up currents. Systems with limited supply current may fail to start up. In battery-powered
systems, it means rapid battery discharge when the voltage decays below the minimum required for regulation.
The TPS775xx and TPS776xx quiescent currents remain low even when the regulator drops out, eliminating
both problems.
The TPS775xx and TPS776xx families also feature a shutdown mode that places the output in the
high-impedance state (essentially equal to the feedback-divider resistance) and reduces quiescent current to
2
μ
A. If the shutdown feature is not used, EN should be tied to ground.
Like all low dropout regulators, the TPS775xx and TPS776xx require an output capacitor connected between
OUT and GND to stabilize the internal control loop. The minimum recommended capacitance value is 10
μ
F and
the ESR (equivalent series resistance) must be between 50m
and 1.5
. Capacitor values 10
μ
F or larger are
acceptable, provided the ESR is less than 1.5
. Solid tantalum electrolytic, aluminum electrolytic, and multilayer
ceramic capacitors are all suitable, provided they meet the requirements described previously.
Figure 24. Typical Application Circuit (Fixed Versions)
13
Submit Documentation Feedback
相關(guān)PDF資料
PDF描述
TPS77525PWPRG4 FAST-TRANSIENT-RESPONSE 500mA LOW-DROPOUT VOLTAGE REGULATORS
TPS775XX FAST-TRANSIENT-RESPONSE 500mA LOW-DROPOUT VOLTAGE REGULATORS
TPS77628DRG4 FAST-TRANSIENT-RESPONSE 500mA LOW-DROPOUT VOLTAGE REGULATORS
TPS77628PWPRG4 FAST-TRANSIENT-RESPONSE 500mA LOW-DROPOUT VOLTAGE REGULATORS
TPS776XX FAST-TRANSIENT-RESPONSE 500mA LOW-DROPOUT VOLTAGE REGULATORS
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS77615QPWPREP 功能描述:低壓差穩(wěn)壓器 - LDO Mil Enh Fast-Trans Resp 500mA 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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TPS77615QPWPRQ1 功能描述:低壓差穩(wěn)壓器 - LDO Fast Trans-Resp 500 mA LDO Vltg Reg 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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TPS77618D 功能描述:低壓差穩(wěn)壓器 - LDO Fast-Tran-Res 500-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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TPS77618DG4 功能描述:低壓差穩(wěn)壓器 - LDO Fast-Tran-Res 500-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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TPS77618DR 功能描述:低壓差穩(wěn)壓器 - LDO Fast-Tran-Res 500-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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*