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| 型号： | MAX1795EUA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/13页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC FIX/ADJ 8UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 升压（升压） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 3.3V，5V，可调 |
| 输入电压： | 1 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 180mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-uMAX |
| 产品目录页面： | 1410 (CN2011-ZH PDF) |
Low Supply Current, Step-Up DC-DC Converters
with True-Shutdown
Pin Description
PIN
1
2
3
4
5
6
7
8
NAME
LBI
FB
LBO
SHDN
GND
LX
OUT
BATT
FUNCTION
Low-Battery Comparator Input. Internally set to trip at +0.85V. This function remains operational in
shutdown.
Dual-Mode ? Feedback Input. Connect to GND for preset 5.0V output. Connect to OUT for preset
3.3V output. Connect a resistive voltage-divider from OUT to GND to adjust the output voltage from
2V to 5.5V.
Low-Battery Comparator Output, Open-Drain Output. LBO is high impedance when V LBI < 0.85V.
This function r emains operational in shutdown.
Shutdown Input. If SHDN is high, the device is in shutdown mode, OUT is high impedance, and
LBI/LBO are still operational. Connect shutdown to GND for normal operation.
Ground
Inductor Connection
Power Output. OUT provides bootstrap power to the IC.
Battery Input and Damping Switch Connection
Detailed Description
The MAX1795/MAX1796/MAX1797 compact step-up
V IN
DC-DC converters start up with voltages as low as
0.85V and operate with an input voltage down to +0.7V.
Consuming only 25μA of quiescent current, these
devices have an internal synchronous rectifier that
reduces cost by eliminating the need for an external
diode and improves overall efficiency by minimizing
losses in the circuit (see Synchronous Rectification sec-
V IN
1M
SHDN
LBO
BATT
MAX1795
MAX1796
LX
OUT
22 μ H
C OUT *
47 μ F
V OUT = 3.3V
tion for details). The internal N-channel MOSFET power
switch resistance is typically 0.17 ? , which minimizes
losses. The LX switch current limits of the MAX1795/
MAX1796/MAX1797 are 0.25A, 0.5A, and 1A, respec-
LBI
MAX1797
GND
FB
tively.
All three devices offer Maxim ’ s proprietary True-
Shutdown circuitry, which disconnects the output from
the input in shutdown and puts the output in a high
impedance state. These devices also feature Maxim ’ s
proprietary LX-damping circuitry, which reduces EMI in
noise-sensitive applications. For additional in-system
flexibility, the LBI/LBO comparator remains active in
shutdown. (Figure 1 is a typical application circuit).
Control Scheme
A unique minimum-off-time, current-limited control
scheme is the key to the MAX1795/MAX1796/
MAX1797s ’ low operating current and high efficiency
over a wide load range. The architecture combines the
high output power and efficiency of a pulse-width-mod-
ulation (PWM) device with the ultra-low quiescent cur-
Dual Mode is a trademark of Maxim Integrated Products.
*SEE TABLE 1 FOR COMPONENT VALUES.
Figure 1. Typical Application Circuit
rent of a traditional pulse-skipping controller (Figure 2).
Switching frequency depends upon the load current
and input voltage, and can range up to 500kHz. Unlike
conventional pulse-skipping DC-DC converters (where
ripple amplitude varies with input voltage), ripple in
these devices does not exceed the product of the
switch current limit and the filter-capacitor equivalent
series resistance (ESR).
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1795EUA+ | 功能描述:直流/直流开关转换器 Low-Supply Current Step-Up DC/DC Conv RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1795EUA+T | 功能描述:直流/直流开关转换器 Low-Supply Current Step-Up DC/DC Conv RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1795EUA-T | 功能描述:直流/直流开关转换器 Low-Supply Current Step-Up DC/DC Conv RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1796EUA | 功能描述:直流/直流开关转换器 Low-Supply Current Step-Up DC/DC Conv RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1796EUA+ | 功能描述:直流/直流开关转换器 Low-Supply Current Step-Up DC/DC Conv RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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