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參數資料
| 型號： | TPS776XX |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | FAST-TRANSIENT-RESPONSE 500mA LOW-DROPOUT VOLTAGE REGULATORS |
| 中文描述： | 快速瞬態響應500mA的低壓差電壓調節器 |
| 文件頁數： | 13/28頁 |
| 文件大小： | 791K |
| 代理商： | TPS776XX |
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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
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| TPS77701D | 功能描述:低壓差穩壓器 - LDO Fast-Tran-Res 750-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 |
| TPS77701DG4 | 功能描述:低壓差穩壓器 - LDO Fast-Tran-Res 750-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 |
| TPS77701DR | 功能描述:低壓差穩壓器 - LDO Fast-Tran-Res 750-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 |
| TPS77701DRG4 | 功能描述:低壓差穩壓器 - LDO Fast-Tran-Res 750-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 |
| TPS77701PWP | 功能描述:低壓差穩壓器 - LDO Fast-Tran-Res 750-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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