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| 型号： | MAX8881EUT25+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 5/12页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 2.5V .2A SOT23-6 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 2.5V |
| 输入电压： | 最高 12V |
| 电压 - 压降（标准）： | 0.1V @ 50mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 200mA |
| 电流 - 限制（最小）： | 200mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | SOT-6 |
| 包装： | 带卷 (TR) |
12V, Ultra-Low-I Q , Low-Dropout
Linear Regulators with POK
Pin Description
MAX888_ (SOT)
PIN
MAX888_ (TDFN)
NAME
FUNCTION
1
2
3
4
4
2
3
1
IN
GND
OUT
FB
Input Voltage. Bypass with a 1μF capacitor to GND.
Ground
Output Voltage. Bypass with a 4.7μF capacitor (<0.5 Ω ESR) to GND for load
currents up to 200mA. For load currents up to 40mA, 1μF is acceptable.
Feedback Set Point, 1.25V (MAX8880 only). Output sense, connect to OUT
externally (MAX8881 only).
ON/OFF Control. Regulator is ON when V SHDN > 2V. If unused, connect to
5
5
SHDN
IN. If reverse battery protection of the SHDN input is desired, connect a
100k Ω resistor in series with SHDN .
6
—
6
—
POK
EP
POK Output, Open Drain. Low when OUT is out of regulation or in shutdown.
Connect POK to OUT through a high-value resistor for a simple error
Exposed paddle (TDFN only). Connect to the circuit ground plane.
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 (MAX8881), or an external resistor net-
work connected to FB (MAX8880). Additional blocks
include an output current limiter, reverse battery pro-
tection, a thermal sensor, shutdown logic, and a POK
comparator to indicate when the output is out of regula-
tion (Figure 2).
Internal P-Channel Pass Transistor
The MAX8880/MAX8881 feature a 2 Ω 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
V IN
2.5V TO 12V
C1
1 μ F
R2*
100k
IN
SHDN
MAX8881
OUT
FB
POK
V OUT
C2
4.7 μ F
REGULATION OK
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
GND
*OPTIONAL
Figure 1. Standard Application Circuit
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 Ω ) multi-
plied by the load current (see Electrical Characteristics ).
_______________________________________________________________________________________
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相关代理商/技术参数 |
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|---|---|
| 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:低压差稳压器 - LDO 12V Linear Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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