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| 型号： | MAX1793EUE18 |
| 厂商： | Maxim Integrated |
| 文件页数： | 8/11页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 1.8V/ADJ 1A 16-TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 96 |
| 稳压器拓扑结构： | 正，固定式或可调式 |
| 输出电压： | 1.8V，1.25 V ~ 5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| 稳压器数量： | 1 |
| 电流 - 输出： | 1A（最小） |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-TSSOP-EP |
| 包装： | 管件 |
| 其它名称： | Q1171259 |
Low-Dropout, Low I Q , 1A Linear Regulator
Internal p-Channel Pass Transistor
The MAX1793 features a 1A p-channel MOSFET pass
transistor. Unlike similar designs using pnp pass tran-
sistors, p-channel MOSFETs require no base drive,
which reduces quiescent current. pnp-based regula-
tors also waste considerable current in dropout when
the pass transistor saturates and use high base-drive
currents under large loads. The MAX1793 does not suf-
fer from these problems and consumes only 225μA of
quiescent current under heavy loads, as well as in
dropout.
Output Voltage Selection
The MAX1793 features Dual Mode operation. In preset
voltage mode, the output of the MAX1793 is set to an
internally trimmed voltage (see the Ordering
Information). Select this mode by connecting SET to
GND (Figure 2).
In adjustable mode, an output is selected between
+1.25V and +5V using two external resistors connected
as a voltage-divider to SET (Figure 3). The output volt-
age is determined by the following equation:
V OUT = V SET [1 + (R1/R2)]
where V SET = +1.25V. To simplify resistor selection:
R1 = R2 [(V OUT /V SET ) – 1]
Since the input bias current at SET is less than 100nA,
large resistance values can be used for R1 and R2 to
minimize power consumption without losing efficiency.
Up to 125k ? is acceptable for R2.
In preset voltage mode, the impedance from SET to
GND should be less than 10k ? . Otherwise, spurious
conditions could cause the voltage at SET to exceed
the 50mV dual-mode threshold.
Shutdown
A logic-low on SHDN disables the MAX1793. In shut-
down, the pass transistor, control circuitry, reference,
and all internal circuits are turned off, reducing supply
current to typically 0.1μA. Connect SHDN to IN for nor-
mal operation. In shutdown, RST goes low and OUT is
discharged to GND with a 5k ? internal resistance.
RST Comparator
The MAX1793 features a low V OUT indicator that asserts
when the output voltage falls out of regulation. The
open-drain RST output goes low when OUT falls 6%
below its nominal output voltage. RST remains low for
4ms after OUT has returned to its nominal value. A
100k ? pullup resistor from RST to a suitable logic sup-
ply voltage (typically OUT) provides a logic control sig-
nal. RST can be used as a power-on-reset (POR) signal
to a microcontroller or can drive an external LED to indi-
cate power failure. RST is low during shutdown.
Current Limiting
The MAX1793 features a current limit that monitors the
pass transistor, typically limiting short-circuit output
current to 1.8A. The current limit is increased to
approximately 2.8A when the output voltage is in regu-
lation, improving performance with large transient
loads. The output can be shorted to ground for an
indefinite period of time without damaging the device.
Thermal-Overload Protection
Thermal-overload protection limits total power dissipa-
tion in the MAX1793. When the junction temperature
exceeds T J = +170°C, a thermal sensor turns off the
pass transistor, allowing the IC to cool. The thermal sen-
sor turns the pass transistor on once the IC’s junction
temperature drops approximately 20°C. Continuous
short-circuit conditions will result in a pulsed output.
IN
NC
OUT
IN
NC
OUT
IN
C IN = 4.7 μ F
IN
IN
MAX1793 OUT
OUT
OUT
C OUT = 6.8 μ F
IN
C IN = 4.7 μ F
IN
IN
IN
MAX1793 OUT
OUT
OUT
R1
OUT
C OUT = 6.8 μ F
ON
OFF
IN
SHDN
OUT
RST
SET
RESET
OUTPUT
ON
OFF
SHDN
GND
RST
SET
RESET
OUTPUT
GND
Figure 2. Typical Operating Circuit with Preset Output Voltage
R2
Figure 3. Typical Operating Circuit with Adjustable Output
Voltage
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1793EUE18+ | 功能描述:低压差稳压器 - LDO Low-IQ 1A 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 |
| MAX1793EUE18+T | 功能描述:低压差稳压器 - LDO Low-IQ 1A 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 |
| MAX1793EUE18-T | 功能描述:低压差稳压器 - LDO Low-IQ 1A 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 |
| MAX1793EUE20 | 功能描述:低压差稳压器 - LDO Low-IQ 1A 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 |
| MAX1793EUE20+ | 功能描述:低压差稳压器 - LDO Low-IQ 1A 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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