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| 型号： | MAX1771EPA |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM 8-DIP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 500kHz |
| 占空比： | 92% |
| 电源电压： | 3 V ~ 16.5 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
MAX1771
12V or Adjustable, High-Efficiency,
Low I Q , Step-Up DC-DC Controller
V IN = 5V
V IN = 5V
C1
C2
300 μ F
C3
0.1 μ F
C2
0.1 μ F
5 REF
4 SHDN
2
V+
MAX1771
L1
22 μ H
C1
68 μ F
D1
1N5817-22
V OUT = 12V
AT 0.5A
68 μ F
C3
0.1 μ F
0.1 μ F
2
V+
5 REF
MAX1771
4 SHDN
EXT
1
L1
22 μ H
D1
1N5817-22
N
C4
V OUT = 12V
AT 0.5A
MTD20N03HDL
3 FB
EXT
1
N
6 AGND
CS
8
6 AGND
CS
8
Si9410DY/
MTD20N03HDL
FB
3
R SENSE
40m ?
R2
127k ?
( V
GND
7
R SENSE
40m ?
C4
300 μ F
R2 = (R1)
V OUT
REF
-1
)
GND
7
R1
18k ?
C5
100pF
V REF = 1.5V
Figure 2a. 12V Preset Output, Bootstrapped
V IN = 4V
Figure 2b. 12V Output, Non-Bootstrapped
for fixed-output operation. External resistors must
be used to set the output voltage. Use 1% external
C3
0.1 μ F
C2
0.1 μ F
5 REF
4 SHDN
6
AGND
2
V+
MAX1771
EXT
CS
1
8
L1
22 μ H
C1
47 μ F
D1
1N5817-22
N
Si9410DY/
MTD20N03HDL
C4
200 μ F
V OUT = 9V
feedback resistors when operating in adjustable-output
mode (Figures 2b, 2c) to achieve an overall output volt-
age accuracy of ±5%. To achieve highest efficiency,
operate in bootstrapped mode whenever possible.
External Power-Transistor
Control Circuitry
PFM Control Scheme
The MAX1771 uses a proprietary current-limited PFM
( V V OUT -1 )
R2 = (R1)
V REF = 1.5V
REF
GND
7
FB
3
R SENSE
40m ?
R1
28k ?
R2
140k ?
C5
100pF
control scheme to provide high efficiency over a wide
range of load currents. This control scheme combines the
ultra-low supply current of PFM converters (or pulse skip-
pers) with the high full-load efficiency of PWM converters.
Unlike traditional PFM converters, the MAX1771 uses a
sense resistor to control the peak inductor current. The
device also operates with high switching frequencies
(up to 300kHz), allowing the use of miniature external
Figure 2c. 9V Output, Bootstrapped
increases at low input voltages. However, the supply
current is also reduced because V+ is at a lower volt-
age, and because less energy is consumed while
charging and discharging the external MOSFET’s gate
capacitance. The minimum input voltage is 3V when
using external feedback resistors. With supply voltages
below 5V, bootstrapped mode is recommended.
Note: When using the MAX1771 in non-boot-
strapped mode, there is no preset output operation
because V+ is also the output voltage sense point
8
components.
As with traditional PFM converters, the power transistor
is not turned on until the voltage comparator senses
the output is out of regulation. However, unlike tradition-
al PFM converters, the MAX1771 switch uses the com-
bination of a peak current limit and a pair of one-shots
that set the maximum on-time (16μs) and minimum off-
time (2.3μs); there is no oscillator. Once off, the mini-
mum off-time one-shot holds the switch off for 2.3μs.
After this minimum time, the switch either 1) stays off if
the output is in regulation, or 2) turns on again if the
output is out of regulation.
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1771EPA+ | 功能描述:DC/DC 开关控制器 12/Adj V Low IQ Step-Up RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1771ESA | 功能描述:DC/DC 开关控制器 12/Adj V Low IQ Step-Up RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1771ESA+ | 功能描述:DC/DC 开关控制器 12/Adj V Low IQ Step-Up RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1771ESA+T | 功能描述:DC/DC 开关控制器 12/Adj V Low IQ Step-Up RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1771ESA-T | 功能描述:DC/DC 开关控制器 12/Adj V Low IQ Step-Up RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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