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| 型号： | MAX1793EUE18+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 9/11页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 1.8V/ADJ 1A 16TSSOP |
| 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： | 带卷 (TR) |
Low-Dropout, Low I Q , 1A Linear Regulator
Thermal-overload protection is designed to safeguard
the MAX1793 in the event of fault conditions. For con-
tinuous operation, do not exceed the absolute maxi-
mum junction-temperature rating of T J = +150°C.
Operating Region and Power Dissipation
Maximum power dissipation of the MAX1793 depends
on the thermal resistance of the case and circuit board,
the temperature difference between the die junction
and ambient air, and the rate of air flow. The power dis-
sipated by the device is: P = I OUT (V IN – V OUT ). The
resulting maximum power dissipation is:
P MAX = [(T J(MAX) – T A )/( θ JC + θ CA )]
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
MAXIMUM OUTPUT CURRENT vs.
INPUT-OUTPUT DIFFERENTIAL VOLTAGE
MAXIMUM CONTINUOUS CURRENT
T A = +25°C
T A = +50°C
T A = +70°C
where (T J(MAX) – T A ) is the temperature difference
between the maximum allowed die junction (+150°C) and
the surrounding air, θ JC (junction-to-case) is the thermal
resistance of the package chosen, and θ CA is the thermal
0.2
0
0
T J(MAX) = +150°C
1 2 3 4 5
INPUT-OUTPUT DIFFERENTIAL VOLTAGE (V)
6
resistance from the case through the PCB, copper traces,
and other materials to the surrounding air. Figure 4 shows
allowable power dissipation for typical PCBs at +25°C,
+50°C, and +70°C ambient temperatures.
The MAX1793 TSSOP-EP package features an exposed
thermal pad on its underside. This pad lowers the ther-
mal resistance of the package by providing a direct heat
conduction path from the die to the PCB. Additionally,
the ground pin (GND) also channels heat. Connect the
exposed thermal pad and GND to circuit ground by
using a large pad (minimum 1in 2 recommended), or mul-
tiple vias to the ground plane.
Applications Information
Capacitor Selection
and Regulator Stability
Capacitors are required at the input and output of the
MAX1793. Connect a 4.7μF capacitor between IN and
ground (C IN ) and a 6.8μF capacitor between OUT and
ground (C OUT ). C IN serves only to lower the source
impedance of the input supply and may be smaller than
4.7μF when the MAX1793 is powered from regulated
power supplies or low-impedance batteries.
The output capacitor’s equivalent series resistance (ESR)
affects stability and output noise. C OUT ESR should be
0.5 ? or less to ensure stability and optimum transient
response. Surface-mount ceramic capacitors have very
low ESR and are commonly available in values up to
10μF. Other low-ESR (< 0.5 ? ) capacitors, such as sur-
face-mount tantalum or OS-CON, may also be used.
Connect CIN and C OUT as close to the IC as possible to
minimize the impact of PCB trace inductance.
Figure 4. Power Operating Region: Maximum Output Current
vs. Input-Output Differential Voltage
Noise, PSRR, and Transient Response
The MAX1793 output noise is typically 115μV RMS during
normal operation. This is suitably low for most applica-
tions. See the output noise plot in the Typical Operating
Characteristics.
The MAX1793 is designed to achieve low dropout volt-
age and low quiescent current in battery-powered sys-
tems while still maintaining good noise, transient
response, and AC rejection. See the Typical Operating
Characteristics for a plot of Power-Supply Rejection
Ratio (PSRR) vs. Frequency. When operating from very
noisy sources, supply noise rejection and transient
response can be improved by increasing the values of
the input and output capacitors and employing passive
postfiltering.
Input-Output (Dropout) Voltage
A regulator’s minimum input-to-output voltage differential
(dropout voltage) determines the lowest usable supply
voltage. In battery-powered systems, this determines the
useful end-of-life battery voltage. Since a p-channel
MOSFET is used as the pass device, dropout voltage is
the product of R DS(ON) and load current (see the
Electrical Characteristics and Dropout Voltage vs. Load
Current in the Typical Operating Characteristics). The
MAX1793 operating current typically remains below
225μA in dropout.
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MAX1793EUE20+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-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 |
| MAX1793EUE25 | 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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