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參數(shù)資料
| 型號(hào)： | MAX8881EUT25-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 12V, Ultra-Low-IQ, Low-Dropout Linear Regulators with POK |
| 中文描述： | 2.5 V FIXED POSITIVE LDO REGULATOR, 0.2 V DROPOUT, PDSO6 |
| 封裝： | TINY SOT-23, 6 PIN |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 228K |
| 代理商： | MAX8881EUT25-T |
M
12V, Ultra-Low-I
Q
, Low-Dropout
Linear Regulators with POK
_______________________________________________________________________________________
5
Pin Description
PIN
NAME
FUNCTION
1
IN
Input Voltage. Bypass with a 1
μ
F capacitor to GND.
2
GND
Ground
3
OUT
Output Voltage. Bypass with a 4.7
μ
F capacitor (<0.5
ESR) to GND for load currents up to
200mA. For load currents up to 40mA, 1
μ
F is acceptable.
Feedback Set Point, 1.25V (MAX8880 only). Output sense, connect to OUT externally
(MAX8881EUT_ _ only).
4
FB
5
SHDN
ON/OFF Control. Regulator is ON when V
SHDN
> 2V. If unused, connect to IN. If reverse
battery protection of the
SHDN
input is desired, connect a 100k
resistor in series with
SHDN
.
POK Output, Open Drain. Low when OUT is out of regulation or in shutdown. Connect POK to
IN through a high-value resistor for a simple error indicator.
6
POK
Detailed Description
The MAX8880/MAX8881 are low-dropout, low-quies-
cent current linear regulators designed primarily for
battery-powered applications (Figure 1). The MAX8880
provides an adjustable output voltage from 1.25V to 5V
using an external resistor-divider. The MAX8881 is
available in factory preset output voltages of 1.8V, 2.5V,
3.3V, and 5V. Both devices have a +1.25V reference,
error amplifier, MOSFET driver, and P-channel pass
transistor (Figure 2).
Low-Dropout Regulator
The 1.25V reference is connected to the error amplifi-
er
’
s inverting input. The error amplifier compares this
reference with the selected feedback voltage and
amplifies the difference. The MOSFET driver reads the
error signal and applies the appropriate drive to the P-
channel pass transistor. If the feedback voltage is lower
than the reference voltage, the pass-transistor gate is
pulled lower, allowing more current to pass, increasing
the output voltage. If the feedback voltage is higher
than the reference voltage, the pass-transistor gate is
driven higher, allowing less current to pass to the out-
put. The output voltage is fed back through either an
internal resistor voltage divider by externally connect-
ing FB to OUT (MAX8881EUT_ _), or an external resis-
tor network connected to FB (MAX8880). Additional
blocks include an output current limiter, reverse battery
protection, a thermal sensor, shutdown logic, and a
POK comparator to indicate when the output is out of
regulation (Figure 2).
Internal P-Channel Pass Transistor
The MAX8880/MAX8881 feature a 2
P-channel MOS-
FET pass transistor. This provides advantages over
similar designs using PNP pass transistors, including
longer battery life. The P-channel MOSFET requires no
base drive, which reduces quiescent current consider-
ably. PNP-based regulators waste considerable current
in dropout when the pass transistor saturates. They
also use high base-drive currents under large loads.
The MAX8880/MAX8881 do not suffer from these prob-
lems and consume only 3.5μA of supply current (see
Typical Operating Characteristics
).
Dropout Voltage
A regulator
’
s minimum input-output differential (or
dropout voltage) determines the lowest usable supply
voltage. In battery-powered systems, this determines
the useful end-of-life battery voltage. Because the
MAX8880/MAX8881 use a P-channel MOSFET pass
transistor, their dropout voltage is R
DS(ON)
(2
) multi-
plied by the load current (see
Electrical Characteristics
).
IN
R2*
100k
OUT
FB
GND
C2
4.7
μ
F
C1
1
μ
F
SHDN
2.5V TO 12V
REGULATION OK
POK
MAX8881
V
IN
V
OUT
*OPTIONAL
Figure 1. Standard Application Circuit
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX8881EUT30 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX8881EUT30-T | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX8881EUT33 | 制造商:Maxim Integrated Products 功能描述:6 PINS THNSOT PKG - Bulk 制造商:Rochester Electronics LLC 功能描述: |
| MAX8881EUT33+ | 制造商:Maxim Integrated Products 功能描述:REG LDO LIN FIX POS 3.3V 0.4A 6PIN SOT-23 - Cut Tape Product |
| MAX8881EUT33+T | 功能描述:低壓差穩(wěn)壓器 - LDO 12V Linear Regulator 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 |
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