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参数资料
| 型号： | MAX1795EUA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/13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： | 2,500 |
| 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： | 带卷 (TR) |
| 供应商设备封装： | 8-uMAX |
Low Supply Current, Step-Up DC-DC Converters
with True-Shutdown
BATT
R1
1M
SHDN
ZERO-
LBO
LBI
+
_
MAX1795
MAX1796
MAX1797
Q
S
CROSSING
AMPLIFIER
-
+
OUT
OUT
+
_
0.85V
R
BODY
DIODE
47μF
TIMER BLOCK
S
R
S
Q
Q
CONTROL
BATT
LX
22μH
BATT
47μF
START
TON MAX
TOFF
MAX
R
OUT
R2
R3
FB
FB SELECT
REFERENCE
+
_
ERROR
AMPLIFIER
CURRENT-LIMIT
AMPLIFIER
+
_
+
_
GND
Figure 2. Functional Diagram
Synchronous Rectification
The internal synchronous rectifier eliminates the need
for an external Schottky diode, reducing cost and
board space. During the cycle off-time, the P-channel
MOSFET turns on and shunts the MOSFET body diode.
As a result, the synchronous rectifier significantly
improves efficiency without the addition of an external
component. Conversion efficiency can be as high
as 95%, as shown in the Typical Operating Char-
acteristics .
Shutdown
The device enters shutdown when V SHDN is high,
reducing supply current to less than 2μA. During shut-
down, the synchronous rectifier disconnects the output
from the input, eliminating the DC conduction path that
normally exists with traditional boost converters in shut-
down mode. In shutdown, OUT becomes a high-imped-
ance node. The LBI/LBO comparator remains active in
shutdown.
As shown in Figure 1, the MAX1795/MAX1796/MAX1797
may be automatically shut down when the input voltage
drops below a preset threshold by connecting LBO to
SHDN ( see Low-Battery Detection section ).
BATT/Damping Switch
The MAX1795/MAX1796/MAX1797 each contain an
internal damping switch to minimize ringing at LX. The
damping switch connects a resistor across the inductor
when the inductor ’ s energy is depleted (Figure 3).
Normally, when the energy in the inductor is insufficient
to supply current to the output, the capacitance and
inductance at LX form a resonant circuit that causes
ringing. The ringing continues until the energy is dissi-
pated through the series resistance of the inductor.
The damping switch supplies a path to quickly dissi-
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MAX1796EUA+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-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 |
| MAX1797EUA | 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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