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参数资料
| 型号： | MAX1658ESA |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | 350mA, 16.5V Input, Low-Dropout Linear Regulators |
| 中文描述： | FIXED/ADJUSTABLE POSITIVE LDO REGULATOR, 1.5 V DROPOUT, PDSO8 |
| 封装： | 0.150 INCH, SOIC-8 |
| 文件页数： | 7/12页 |
| 文件大小： | 111K |
| 代理商： | MAX1658ESA |
M
350mA, 16.5V Input,
Low-Dropout Linear Regulators
_______________________________________________________________________________________
7
P-Channel Pass T ransistor
The MAX1658/MAX1659 feature an internal P-channel
MOSFET pass transistor. Using a MOSFET provides
several advantages over similar PNP designs, including
lower dropout voltage and extended battery life. Unlike
bipolar transistors, MOSFETs reduce quiescent current,
because they require no base current, particularly at
heavy loads and in dropout. As a result, the
MAX1658/MAX1659 operate at a low quiescent current
even in dropout.
Output V oltage S elec tion
Dual Mode operation allows the MAX1658/MAX1659 to
operate at either a preset or a user-adjustable output
voltage. The device compares the SET pin voltage with
an internal 65mV reference. If the voltage is lower than
65mV (typically achieved by grounding SET), the
device switches to an internal resistor-divider feedback
network that sets the output voltage. The MAX1658’s
preset output voltage is 3.3V and the MAX1659’s is 5V
(Figure 2).
If the SET pin is not below 65mV, the device switches to
external feedback and SET becomes a feedback input.
The feedback network can be configured to produce
an output between 16V and the voltage reference
(nominally 1.21V). Under regulation, the feedback
mechanism adjusts the error signal such that the volt-
age at the SET pin equals the reference voltage.
Therefore, to achieve the minimum output, connect SET
directly to OUT. For other voltages, a resistive voltage-
divider network is necessary. Figure 3 shows the topol-
ogy of a typical circuit operating in adjustable mode.
The output voltage is set by the following equation:
where V
SET
= 1.21V. Solving for R1 yields:
The input leakage current of the SET input is less than
25nA. This allows the use of large resistors in the feed-
back network to minimize output current loss without
compromising accuracy. R2 can be as high as 500k
in most applications.
S hutdown
A logic low on the
SHDN
pin places the MAX1658/
MAX1659 in shutdown. This mode deactivates all func-
tions, including the pass transistor. The device con-
sumes less than 1μA of supply current in shutdown,
and its output becomes high impedance. The
MAX1658/MAX1659 exit shutdown in 100μs.
Output Current Limit
The MAX1658/MAX1659 include current-limiting circuit-
ry that monitors and controls the pass transistor and
limits output current to around 900mA. The output can
be shorted to ground indefinitely without damaging the
device.
R1 = R2
V
V
1
OUT
SET
V
V
R
R
OUT
SET
+
=
1
1
2
MAX1658
(MAX1659)
SHDN
2
4, 5
8
1
3, 6, 7
IN
INPUT
VOLTAGE
ON
OFF
OUTPUT VOLTAGE
3.3V/350mA
(5V/350mA)
10
μ
F
0.1
μ
F
GND
SET
OUT
Figure 2. Preset Output Configuration
MAX1658
MAX1659
IN
3, 6, 7
4, 5
1
8
2
SHDN
OUTPUT
VOLTAGE
C
OUT
10
μ
F
R1
R2
0.1
μ
F
INPUT
VOLTAGE
GND
OUT
SET
V
= V
1 + R1
)
R2
V
SET
= 1.21V
Figure 3. Adjustable Output Configuration Using External
Feedback Resistors
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1658ESA+ | 功能描述:低压差稳压器 - LDO 350mA 16.5V 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 |
| MAX1658ESA+T | 功能描述:低压差稳压器 - LDO 350mA 16.5V 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 |
| MAX1658ESA-T | 功能描述:低压差稳压器 - LDO 350mA 16.5V 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 |
| MAX1659C/D | 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 |
| MAX1659C/D+ | 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 |
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