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参数资料
| 型号： | MAX1844ETP+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 20-TQFN |
| 标准包装： | 60 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 600kHz |
| 电源电压： | 4.5 V ~ 5.5 V |
| 降压： | 是 |
| 升压： | 无 |
| 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： | 20-WFQFN 裸露焊盘 |
| 包装： | 管件 |
High-Speed Step-Down Controller with
Accurate Current Limit for Notebook Computers
OUT
V BATT
DH
TO ERROR AMP
FIXED
1.8V
MAX1844
MAX1844
V OUT
DL
FIXED
2.5V
FB
CS
OUT
R1
FB
R2
GND
0.2V
Figure 7. Setting V OUT with a Resistor-Divider
DL is kept high continuously in shutdown mode or
2V
Figure 6. Feedback Mux
Power-Good Output (PGOOD)
The PGOOD window comparator continuously monitors
the output. PGOOD is actively held low in shutdown,
standby, and soft-start. After digital soft-start terminates,
PGOOD is released if the output is within 10% of the
nominal output voltage setting. Note that the PGOOD
window detector is completely independent of the over-
voltage and undervoltage protection fault detectors.
Output Overvoltage Protection
OVP controls the output overvoltage protection func-
tion. Connect OVP to V CC to disable overvoltage pro-
tection. If overvoltage protection is enabled, the output
is continuously monitored. If the output exceeds the
overvoltage protection threshold, overvoltage protec-
tion is triggered and the DL low-side gate-driver output
is forced high. This turns on the low-side MOSFET
switch to rapidly discharge the output capacitor and
reduce the output voltage.
If LATCH is high, normal operation resumes when the
overvoltage condition ends. If LATCH is low, the DL
gate-driver output remains high until OVP is brought
high, SHDN is toggled, or V CC is cycled below 1V.
When the condition that caused the overvoltage per-
sists (such as a shorted high-side MOSFET), the bat-
tery fuse will open. If overvoltage protection is enabled,
when UVLO is active.
Note that forcing DL high in shutdown causes the out-
put voltage to go slightly negative when energy has
been previously stored in the LC tank circuit (see the
shutdown waveforms in the Typical Operating
Characteristics ). If the load cannot tolerate being
forced to a negative voltage, it may be desirable to
place a power Schottky diode across the output to act
as a reverse-polarity clamp.
Output Undervoltage Protection
UVP controls the output undervoltage protection func-
tion. Connect UVP to GND to disable undervoltage pro-
tection. The output undervoltage protection function is
similar to foldback current limiting but employs a timer
and latch rather than a variable current limit. If the output
voltage is below the undervoltage protection threshold
after the output undervoltage protection blanking time
has elapsed, the PWM is latched off and does not restart
until V CC power is cycled. SHDN is toggled, or UVP is
brought low.
Connect UVP to V CC to enable the default undervoltage
trip threshold of 70% of nominal. To select a different
threshold, drive UVP to a voltage between 0.4V and 1V
for a threshold between 40% and 100% of nominal.
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1844ETP+ | 功能描述:电流型 PWM 控制器 Step-Down Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1844ETP+T | 功能描述:电流型 PWM 控制器 Step-Down Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1844ETP-T | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1844EVKIT | 功能描述:电源管理IC开发工具 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX1845EEI | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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