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参数资料
| 型号： | MAX1589EZT180-T |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | Low-Input-Voltage, 500mA LDO Regulator with RESETin SOT and TDFN |
| 中文描述： | 1.8 V FIXED POSITIVE LDO REGULATOR, 0.35 V DROPOUT, PDSO6 |
| 封装： | SC-74, MO-193, SOT-23, 6 PIN |
| 文件页数： | 6/12页 |
| 文件大小： | 312K |
| 代理商： | MAX1589EZT180-T |
M
Detailed Description
The MAX1589 is a low-dropout, low-quiescent-current,
high-accuracy linear regulator designed primarily for
battery-powered applications. The device supplies
loads up to 500mA and is available with preset output
voltages from +0.75V to +3.0V. As illustrated in Figure 1,
the MAX1589 contains a reference, an error amplifier, a
P-channel pass transistor, an internal feedback voltage-
divider, and a power-good comparator.
The error amplifier compares the reference with the
feedback voltage and amplifies the difference. If the
feedback voltage is lower than the reference voltage,
the pass-transistor gate is pulled lower, allowing more
current to pass to the output and increasing 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.
Internal P-Channel Pass Transistor
The MAX1589 features a 0.33
Ω
(R
DS(ON)
) 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 regulators also waste considerable current in
dropout when the pass transistor saturates and use
high base-drive currents under large loads. The
MAX1589 does not suffer from these problems and
consumes only 90μA (typ) of quiescent current under
heavy loads, as well as in dropout.
Shutdown
Pull
SHDN
low to enter shutdown. During shutdown, the
output is disconnected from the input, an internal 1.5k
Ω
resistor pulls OUT to GND,
RESET
is actively pulled
low, and supply current drops below 1μA.
RESET
Output
The MAX1589’s microprocessor (μP) supervisory cir-
cuitry asserts a guaranteed logic-low reset during
power-up, power-down, and brownout conditions down
to +1V.
RESET
asserts when V
OUT
is below the reset
threshold and remains asserted for at least 70ms (t
RP
)
after V
OUT
rises above the reset threshold.
Current Limit
The MAX1589 monitors and controls the pass transis-
tor’s gate voltage, limiting the output current to 850mA
(typ). If the output current exceeds I
LIM
, the MAX1589
output voltage drops.
Thermal-Overload Protection
Thermal-overload protection limits total power dissipa-
tion in the MAX1589. When the junction temperature
exceeds +165°C, a thermal sensor turns off the pass
Low-Input-Voltage, 500mA LDO Regulator
with
RESET
in SOT and TDFN
6
_______________________________________________________________________________________
PART
SOT23
TDFN
NAME
FUNCTION
1
6
IN
Regulator Input. Supply voltage can range from +1.62V to +3.6V. Bypass IN with at least a
1μF ceramic capacitor to GND (see the
Capacitor Selection and Regulator Stability
section).
Ground. GND also functions as a heatsink. Solder GND to a large pad or circuit-board
ground plane to maximize SOT23 power dissipation.
2
—
GND
—
4
GND
Ground
3
5
SHDN
Active-Low Shutdown Input. A logic low reduces supply current to below 1μA. Connect to
IN or logic high for normal operation.
Active-Low, Open-Drain Reset Output.
RESET
rises 100ms after the output has achieved
regulation.
RESET
falls immediately if V
OUT
drops below 82.5% of its nominal voltage, or if
the MAX1589 is shut down.
4
3
RESET
5
2
I.C.
Internally Connected. Leave floating or connect to GND.
6
1
OUT
Regulator Output. Sources up to 500mA. Bypass with a 4.7μF low-ESR ceramic capacitor
to GND.
—
Exposed
Pad
EP
Ground. EP also functions as a heatsink. Solder EP to a large pad or circuit-board ground
plane to maximize TDFN power dissipation.
Pin Description
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1589EZT250-T | Low-Input-Voltage, 500mA LDO Regulator with RESETin SOT and TDFN |
| MAX1589EZT300-T | Low-Input-Voltage, 500mA LDO Regulator with RESETin SOT and TDFN |
| MAX1595 | Regulated 3.3V/5.0V Step-Up/Step-Down Charge Pump |
| MAX1595ETC33 | Regulated 3.3V/5.0V Step-Up/Step-Down Charge Pump |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1589EZT250+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1589EZT250+T | 功能描述:低压差稳压器 - LDO 500mA 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 |
| MAX1589EZT250-T | 功能描述:低压差稳压器 - LDO 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 |
| MAX1589EZT300+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1589EZT300+T | 功能描述:低压差稳压器 - LDO 500mA 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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