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参数资料
| 型号： | MAX1982 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Voltage, Low-Dropout Linear Regulators with External Bias Supply |
| 中文描述： | 低电压、低压差线性稳压器，外部偏置电源 |
| 文件页数： | 8/12页 |
| 文件大小： | 383K |
| 代理商： | MAX1982 |
M
Low-Voltage, Low-Dropout Linear Regulators
with External Bias Supply
8
_______________________________________________________________________________________
Pin Description
PIN
MAX1982
MAX1983
NAME
FUNCTION
1
1
BIAS
Bias Voltage. Input voltage to the control circuitry. BIAS powers all control blocks and the gate
of the pass transistor. Bypass BIAS to GND with a 0.1μF ceramic capacitor.
2
2
GND
Ground
3
3
SHDN
Shutdown Control Input. Drive
SHDN
low to enter the low-power shutdown state. Connect
SHDN
to BIAS for normal operation.
4
—
PGOOD
Power-Good Output. The open-drain PGOOD output goes high at least 1ms after the output
voltage has attained regulation. PGOOD asserts low 10μs after the output falls by 10%.
—
4
ADJ
Feedback for Adjustable Output. Connect ADJ to the midpoint of a resistor-divider between
OUT and GND for an adjustable output voltage between 0.8V and 2.0V.
5
5
OUT
Regulator Output. Bypass OUT to GND with a 10μF to 22μF low-ESR ceramic capacitor.
6
6
IN
Internal Pass Transistor Input. IN connects to the drain of the internal power switch. Bypass IN
to GND with a 10μF ceramic capacitor.
Detailed Description
The MAX1982/MAX1983 are low-voltage, low-dropout
linear regulators with an external bias supply input (see
Figures 1 and 2). BIAS is powered by a 4.5V to 5.5V
supply that is commonly available in laptop and desk-
top computers. The 5V bias supply drives the gate of
the internal pass transistor, while a lower voltage input
at the drain of the transistor (IN) is regulated to provide
V
OUT
. Separating the bias input voltages yields higher
efficiency. These devices are ideal for applications that
require low-voltage outputs from low-voltage inputs.
The MAX1982 delivers 1.2V (±3%) at 300mA from an
input voltage of 1.25V to 5.5V. The MAX1983 delivers
an adjustable output voltage from 0.8V to 2V.
The MAX1982 features an open-drain PGOOD output
that transitions high 1ms after the output reaches regu-
lation. PGOOD goes low within 10μs of the output
falling out of regulation by 120mV.
Both devices feature current- and thermal-limiting cir-
cuitry that protect the MAX1982/MAX1983 from dam-
age during fault conditions.
Bias Supply Input
The BIAS input powers the control circuitry and pro-
vides the pass transistor gate drive. Power BIAS from a
well-regulated 5V (
±
10%) supply. Current drawn from
the BIAS supply remains relatively constant with varia-
tions in V
IN
and load current (see the
Typical Operating
Characteristics
). Bypass BIAS with a 0.1μF or greater
capacitor as close to the device as possible. The bias
supply current remains low (250μA) when the
MAX1982/MAX1983 are in dropout.
Power-Supply Input
IN connects to the drain of the internal N-channel
power transistor. IN may be as low as 1.25V, minimizing
power dissipation. Bypass IN with a 10μF or greater
capacitor as close to the device as possible.
Shutdown
The MAX1982/MAX1983 feature a low-power shutdown
mode that reduces quiescent current drawn to 1μA
(typ), and BIAS current consumption to less than 1μA
(typ). Driving
SHDN
low disables the voltage reference,
error amplifier, gate-drive circuitry, and pass transistor
(see Figure 2), and the device output enters a high-
impedance state. Connect
SHDN
to BIAS for normal
operation.
PGOOD Output
The MAX1982 provides an open-drain PGOOD output
that goes high 1ms (min) after the output attains regula-
tion (within 10% of the nominal output voltage). PGOOD
transitions low 10μs after the output falls out of regula-
tion by 120mV, or when the device enters shutdown.
Connect a pullup resistor from PGOOD to BIAS for a
logic-level output. Use a 100k
resistor to minimize
current consumption.
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| MAX1983EUT-T | Low-Voltage, Low-Dropout Linear Regulators with External Bias Supply |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1982EUT | 制造商:Maxim Integrated Products 功能描述:LOW-VOLTAGE, LOW-DROPOUT LINEAR REGULATORS WI - Cut Tape Product |
| MAX1982EUT+ | 制造商:Maxim Integrated Products 功能描述:LDO REG 1.2V 0.3A 6PIN SOT-23 - Rail/Tube |
| MAX1982EUT+T | 功能描述:低压差稳压器 - LDO Low-Voltage w/ External Bias Supply 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 |
| MAX1982EUT-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 |
| MAX1982EVKIT | 功能描述:低压差稳压器 - LDO Evaluation Kit for the MAX1982 MAX1983 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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