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| 型号： | MAX1983EUT+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/13页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ .3A SOT23-6 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 0.8 V ~ 2 V |
| 输入电压： | 1.25 V ~ 5.5 V |
| 稳压器数量： | 1 |
| 电流 - 输出： | 300mA |
| 电流 - 限制（最小）： | 330mA |
| 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： | 标准包装 |
| 产品目录页面： | 1410 (CN2011-ZH PDF) |
| 其它名称： | MAX1983EUT+TDKR |
Low-Voltage, Low-Dropout Linear Regulators
with External Bias Supply
Pin Description
PIN
NAME
FUNCTION
MAX1982
MAX1983
1
2
3
4
—
5
6
1
2
3
—
4
5
6
BIAS
GND
SHDN
PGOOD
ADJ
OUT
IN
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.
Ground
Shutdown Control Input. Drive SHDN low to enter the low-power shutdown state. Connect
SHDN to BIAS for normal operation.
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%.
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.
Regulator Output. Bypass OUT to GND with a 10μF to 22μF low-ESR ceramic capacitor.
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 Ω resistor to minimize
current consumption.
8
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