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参数资料
| 型号： | MAX8819CETI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 23/29页 |
| 文件大小： | 0K |
| 描述： | IC PMIC W/INT CHARGER 28TQFN-EP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 应用： | 手持/移动设备 |
| 电源电压： | 4.1 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（4x4） |
| 包装： | 管件 |
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PMIC with Integrated Chargers and Smart
Power Selector in a 4mm x 4mm TQFN
SYS
2.5V RISING
+
-
SYSOK
100mV HYST.
DIE TEMP
+
READY
MAX8819C
DT165
-
+165 ° C
DC
6.0V RISING
+
-
DCOVLO
400mV HYST.
-
DCPOK
4.0V RISING
500mV HYST.
+
DCUVLO
SOFT-START
REG1
EN
OK
REG1OK
EN123
2MHz
OSC
SOFT-START
REG2
BIAS
EN
OK
REG2OK
AND
REF
SOFT-START
REG3
READY
64 CYCLE
REGON
EN
OK
REG3OK
DELAY
(32 μ s)
SOFT-START
REG4
EN4
REGON
EN
OK
REG4OK
Figure 5b. MAX8819C Enable Logic
As the load current is increased beyond this point, the
output voltage sags and the converter goes out of regu-
lation because the inductor current cannot increase
above the p-channel peak current limit.
Step-Down Converter Short-Circuit Protection
The step-down converter implements short-circuit protec-
tion by monitoring the feedback voltage, V FB_ . After soft-
start, if V FB_ drops below 0.23V, the converter reduces its
switching frequency to f S /3. The inductor current still
reaches the p-channel peak current limit, however, at
one-third the frequency. Therefore, the output and input
currents are reduced to approximately one-third of the
maximum value in response to an output short circuit to
ground. When the short is removed, the inductor current
raises the voltage on the output capacitor and the step-
down converter resumes normal operation.
REG1 Reset ( RST1 )
RST1 is an active-low, open-drain output that pulls low
to indicate that FB1 is below its regulation threshold.
RST1 goes high 200ms after FB1 reaches its regulation
threshold. RST1 is high-impedance when EN123 is
high. See Figures 6 and 7.
A 50μs blanking delay is provided when FB1 is falling,
so that RST1 does not glitch if the REG1 output voltage
is dynamically adjusted by altering the resistors in its
feedback network.
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8819CETI+ | 功能描述:PMIC 解决方案 PMIC w/Charger & Smart Power Selector RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX8819CETI+T | 功能描述:PMIC 解决方案 PMIC w/Charger & Smart Power Selector RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX8819DETI+ | 功能描述:PMIC 解决方案 PMIC w/Charger & Smart Power Selector RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX8819DETI+T | 功能描述:PMIC 解决方案 PMIC w/Charger & Smart Power Selector RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX881REUB | 功能描述:PMIC 解决方案 Bias Supply w/Power OK for GaAsFET PA RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
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