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| 型号： | MAX8764ETP+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/23页 |
| 文件大小： | 0K |
| 描述： | IC CNTRL STP DWN HS 20-TQFN |
| 标准包装： | 60 |
| 应用： | 控制器，笔记本电脑电源系统 |
| 输入电压： | 2 V ~ 28 V |
| 输出数： | 1 |
| 输出电压： | 1.8V，2.5V，1 V ~ 5.5 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WQFN 裸露焊盘 |
| 供应商设备封装： | 20-TQFN-EP（5x5） |
| 包装： | 管件 |
High-Speed, Step-Down Controller with
Accurate Current Limit for Notebook Computers
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-
Fixed-Output Voltages
The MAX8764’s Dual Mode operation allows the selec-
tion of common voltages without requiring external com-
ponents (Figure 6). Connect FB to GND for a fixed 2.5V
output or to V CC for a 1.8V output, or connect FB directly
to OUT for a fixed 1V output.
Setting V OUT with a Resistor-Divider
The output voltage can be adjusted from 1V to 5.5V with
a resistor-divider if desired (Figure 7). The equation for
adjusting the output voltage is:
V OUT FB ? 1 +
= V
?
tion. Connect OVP to V CC or LATCH to V CC to disable
overvoltage protection. If overvoltage protection is
enabled (OVP < 1.8V, LATCH = GND), the output is
?
?
R1 ?
R2 ?
continuously monitored. If the output exceeds the over-
voltage protection threshold, overvoltage protection 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, the overvoltage protection is dis-
abled. If LATCH is low, the DL gate-driver output
remains high until OVP is driven to V CC , or V CC is
cycled below 1V. When the condition that caused the
overvoltage persists (such as a shorted high-side MOS-
FET), the battery fuse opens.
Note that forcing DL high causes the output voltage to
go slightly negative when energy has been previously
stored in the LC tank circuit (see the output overvoltage
waveforms in the Typical Operating Characteristics ). If
the load cannot tolerate being forced to a negative volt-
age, it may be desirable to place a power Schottky
diode across the output to act as a reverse-polarity
where V FB is 1V.
Design Procedure
Component selection for the MAX8764 is primarily dictat-
ed by the following four criteria:
1) Input voltage range . The maximum value (V IN(MAX) )
must accommodate the worst-case high AC-adapter
voltage. The minimum value (V IN(MIN) ) must account
for the lowest battery voltage after drops due to con-
nectors, fuses, and battery selector switches. Lower
input voltages result in better efficiency.
OUT
clamp.
TO ERROR AMP
FIXED
MAX8764
1.8V
Output Undervoltage Protection
UVP controls the output undervoltage protection func-
tion. Connect UVP to GND or LATCH to V CC to disable
undervoltage protection. The output undervoltage pro-
tection 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 pro-
tection threshold after the output undervoltage protection
blanking time has elapsed, the PWM is latched off, DL is
pulled low, and the controller does not restart until V CC
power is cycled. SHDN is toggled, or UVP is pulled
below 0.4V.
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.
Figure 6. Feedback Mux
FIXED
2.5V
0.2V
2V
FB
______________________________________________________________________________________
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8764ETP+ | 功能描述:电流型 PWM 控制器 High-Speed 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 |
| MAX8764ETP+T | 功能描述:电流型 PWM 控制器 High-Speed 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 |
| MAX8764ETP-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 |
| MAX8765AETI+ | 功能描述:电池管理 Multichemistry Battery Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX8765AETI+T | 功能描述:电池管理 Multichemistry Battery Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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