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參數(shù)資料
| 型號： | TPS77418DGKRG4 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 250-mA LDO REGULATORS WITH 8-PIN MSOP PACKAGING |
| 中文描述： | 250毫安LDO穩(wěn)壓器有8引腳MSOP封裝 |
| 文件頁數(shù)： | 15/24頁 |
| 文件大?。?/td> | 347K |
| 代理商： | TPS77418DGKRG4 |
TPS77301/315/316/318/327/328/333/350 WITH RESET OUTPUT
TPS77401
/
415
/
418
/
427
/
428
/
433
/
450 WITH POWER GOOD OUTPUT
250-mA LDO REGULATORS WITH 8-PIN MSOP PACKAGING
SLVS281E
–
FEBRUARY 2000
–
REVISED JULY 2001
15
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
pin functions
enable (EN)
The EN terminal is an input which enables or shuts down the device. If EN is a logic high, the device will be in
shutdown mode. When EN goes to logic low, then the device will be enabled.
power good (PG) (TPS774xx)
The PG terminal is an open drain, active high output that indicates the status of V
out
(output of the LDO). When
V
out
reaches 82% of the regulated voltage, PG will go to a high-impedance state. It will go to a low-impedance
state when V
out
falls below 82% (i.e. over load condition) of the regulated voltage. The open drain output of the
PG terminal requires a pullup resistor
.
sense (SENSE)
The SENSE terminal of the fixed-output options must be connected to the regulator output, and the connection
should be as short as possible. Internally, SENSE connects to a high-impedance wide-bandwidth amplifier
through a resistor-divider network and noise pickup feeds through to the regulator output. It is essential to route
the SENSE connection in such a way to minimize/avoid noise pickup. Adding RC networks between the SENSE
terminal and V
out
to filter noise is not recommended because it may cause the regulator to oscillate.
feedback (FB)
FB is an input terminal used for the adjustable-output options and must be connected to an external feedback
resistor divider. The FB connection should be as short as possible. It is essential to route it in such a way to
minimize/avoid noise pickup. Adding RC networks between FB terminal and V
out
to filter noise is not
recommended because it may cause the regulator to oscillate.
reset (RESET) (TPS773xx)
The RESET terminal is an open drain, active low output that indicates the status of V
out
. When V
out
reaches 95%
of the regulated voltage, RESET will go to a high-impedance state after a 220-ms delay. RESET will go to a
low-impedance state when V
out
is below 95% of the regulated voltage. The open-drain output of the RESET
terminal requires a pullup resistor.
external capacitor requirements
An input capacitor is not usually required; however, a bypass capacitor (0.047
μ
F or larger) improves load
transient response and noise rejection if the TPS773xx or TPS774xx is located more than a few inches from
the power supply. A higher-capacitance capacitor may be necessary if large (hundreds of milliamps) load
transients with fast rise times are anticipated.
Most low noise LDOs require an external capacitor to further reduce noise. This will impact the cost and board
space. The TPS773xx and TPS774xx have very low noise specification requirements without using any external
components.
Like all low dropout regulators, the TPS773xx or TPS774xx requires an output capacitor connected between
OUT (output of the LDO) and GND (signal ground) to stabilize the internal control loop. The minimum
recommended capacitance value is 1
μ
F provided the ESR meets the requirement in Figures 19 and 21. In
addition, a low-ESR capacitor can be used if the capacitance is at least 10
μ
F and the ESR meets the
requirements in Figures 18 and 20. Solid tantalum electrolytic, aluminum electrolytic, and multilayer ceramic
capacitors are all suitable, provided they meet the requirements described previously.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS77427DGK | 功能描述:低壓差穩(wěn)壓器 - LDO Fast Transient Response 250-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 |
| TPS77427DGKG4 | 功能描述:低壓差穩(wěn)壓器 - LDO Fast Transient Response 250-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 |
| TPS77427DGKR | 功能描述:低壓差穩(wěn)壓器 - LDO Fast Transient Response 250-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 |
| TPS77427DGKRG4 | 功能描述:低壓差穩(wěn)壓器 - LDO Fast Transient Response 250-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 |
| TPS77428DGK | 功能描述:低壓差穩(wěn)壓器 - LDO Fast Transient Response 250-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 |
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