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| 型号： | MAX8819CETI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 24/29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
NOTES
1
2
3
4
5
6
7
8
V DC
V BAT < V SYS < V DC
V SYS
V BAT
V BAT
t SS-D-S
V EN123
V OUT1
V OUT2
t SS1
t SS2
V OUT3
t SS3
HIGH
IMPEDANCE
V RST1
t DRST1
V EN4
V OUT4
V SYS - V D
t SS4
V SYS - V D
V CEN
V CHG
Figure 6. MAX8819A/MAX8819B Enable/Disable Waveforms Example
t SS_CHG
Step-Down Converter
Active Discharge in Shutdown
Each MAX8819_ step-down converter (REG1, REG2,
REG3) has an internal 1k Ω resistor that discharges the
output capacitor when the converter is off. The dis-
charge resistors ensure that the load circuitry powers
down completely. The internal discharge resistors are
connected when a converter is disabled and when the
device is in UVLO with an input voltage greater than
1.0V. With an input voltage less than 1.0V the internal
discharge resistors are not activated.
Step-Down Converter Enable/
Disable (EN123) and Sequencing
Figure 5a shows the MAX8819A/MAX8819B enable and
disable logic. Figure 5b shows the MAX8819C
enable/disable logic. Figure 6 shows an example of
enable and disable waveforms for the MAX8819A/
MAX8819B.
Figure 6 notes:
1) The device is off with no external power applied to
DC. The system voltage (V SYS ) is equal to the bat-
tery voltage (V BAT ).
2) An external supply is applied to DC that causes the
step-down converter to power up after the DC-to-
SYS soft-start time (t SS-D-S ). When the DC input is
valid and DLIM[1:2] ≠ 11, V SYS increases.
3) When V1 reaches the reset trip threshold (V THRST ),
the reset deassert delay timer starts. When the reset
deassert delay timer expires (t DRST1 ), RST1 goes
high-impedance. If RST1 is connected to the RESET
24
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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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