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參數(shù)資料
| 型號： | MAX1792EUA18 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 500mA Low-Dropout Linear Regulator in レMAX |
| 中文描述： | FIXED/ADJUSTABLE POSITIVE LDO REGULATOR, PDSO8 |
| 封裝： | POWER, MICRO MAX PACKAGE-8 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 414K |
| 代理商： | MAX1792EUA18 |
Detailed Description
The MAX1792 is a low-dropout, low-quiescent-current
linear regulator designed primarily for battery-powered
applications. The device supplies loads up to 500mA
and is available with preset output voltages. As illustrat-
ed in Figure 1, the MAX1792 consists of a 1.25V refer-
ence, error amplifier, P-channel pass transistor, and
internal feedback voltage-divider.
The 1.25V reference is connected to the error amplifier,
which compares this reference with the feedback volt-
age and amplifies the difference. If the feedback volt-
age is lower than the reference voltage, the
pass-transistor gate is pulled lower, which allows more
current to pass to the output and increases the output
voltage. If the feedback voltage is too high, the pass-
transistor gate is pulled up, allowing less current to
pass to the output.
The output voltage is fed back through either an inter-
nal resistive divider connected to OUT or an external
resistor network connected to SET. The Dual Mode
comparator examines V
SET
and selects the feedback
path. If V
SET
is below 50mV, the internal feedback path
is used and the output is regulated to the factory-preset
voltage.
Additional blocks include an output current limiter, ther-
mal sensor, and shutdown logic.
Internal P-Channel Pass Transistor
The MAX1792 features a 0.25
P-channel MOSFET
pass transistor. Unlike similar designs using PNP pass
transistors, P-channel MOSFETs require no base drive,
which reduces quiescent current. PNP-based regula-
tors also waste considerable current in dropout when
the pass transistor saturates, and use high base-drive
currents under large loads.
M
500mA Low-Dropout
Linear Regulator in μMAX
_______________________________________________________________________________________
7
100mV
SHDN
IN
IN
RST
ON
OFF
V
IN
= +2.5V TO +5.5V
C
IN
1
μ
F
OUT
OUT
V
OUT
= 1.25V TO 5.0V
C
OUT
3.3
μ
F
THERMAL
SENSOR
SET
MOSFET
DRIVER WITH
ILIM
DELAY
TIMER
SHUTDOWN
LOGIC
V
1.25V
ERROR
AMPLIFIER
GND
R1
R2
R
RST
100k
LOGIC SUPPLY
VOLTAGE (V
OUT
)
93% V
REF
TO
μ
C
5k
MAX1792
Figure 1. Functional Diagram
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1792EUA25 | 500mA Low-Dropout Linear Regulator in レMAX |
| MAX1792EUA33 | Replaced by TMS320C6722B : Digital Signal Processor 181-CPGA |
| MAX1792EUA__ | Replaced by TMS320VC33 : Digital Signal Processor 132-BQFP -40 to 85 |
| MAX1792EUA50 | 500mA Low-Dropout Linear Regulator in レMAX |
| MAX1793 | Replaced by TMS320VC33 : Digital Signal Processor 132-BQFP 0 to 70 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1792EUA18/V+ | 制造商:Maxim Integrated Products 功能描述:500MA, LOW-DROPOUT LINEAR REGULATOR IN UMAX - Rail/Tube |
| MAX1792EUA18/V+T | 制造商:Maxim Integrated Products 功能描述:500MA, LOW-DROPOUT LINEAR REGULATOR IN UMAX - Tape and Reel |
| MAX1792EUA18+ | 功能描述:低壓差穩(wěn)壓器 - LDO 500mA 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(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 |
| MAX1792EUA18+ | 制造商:Maxim Integrated Products 功能描述:IC LDO REG 1.8V 500MA. 8UMAX |
| MAX1792EUA18+T | 功能描述:低壓差穩(wěn)壓器 - LDO 500mA 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(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 |
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