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参数资料
| 型号： | MAX8939EWV+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 22/45页 |
| 文件大小： | 0K |
| 描述： | IC PWR MGMT HANDSETS 30WLP |
| 标准包装： | 2,500 |
| 应用： | 充电泵，无线设备 |
| 输入电压： | 2.9 V ~ 5.5 V |
| 输出数： | 7 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | * |
| 封装/外壳： | * |
| 供应商设备封装： | * |
| 包装： | * |
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MAX8939/MAX8939A/MAX8939B
System Power Management
for Mobile Handset
timer and the host must continue to read or write register
0x09 or 0x0A in intervals of under 5s. If the host takes
more than 5s for reading or writing these registers, the
watchdog timer expires, generates an interrupt, flags
the watchdog timeout in register 0x03, and disables the
charger (Figure 4).
Charge in Overvoltage Protection
To detect that a valid charger is asserted at CHG_IN, an
upper and lower threshold is defined. This threshold is
different for the MAX8939, MAX8939A, and MAX8939B.
See the Electrical Characteristics table for upper/lower
threshold.
If an overvoltage condition occurs on CHG_IN, a de-
bounce timer is enabled and powers the charger down
after a max delay of 324ms. When the charger is pow-
ered down, an interrupt occurs and a flag is set in event
register A.
This OVP timer enables the possibility of using a low
cost wall-plug adapter with poor voltage regulation. The
charger continue charging and no interrupt occurs as
long the OVP is not violating the max 324ms.
Fast thermal regulation ensures that the temperature
does not exceed the programmed value (default is
programmed at +100 N C at high voltage < 30V and maxi-
mum charge current). If the junction temperature rises
Interrupt Request ( IRQ )
IRQ is an active-low, open-drain output signal (requires
an external pullup resistor) that indicates that an interrupt
event has occurred and that the event and status infor-
mation are available in the event/status registers. Such
information includes temperature and voltages inside
the ICs fault conditions, etc. The event registers hold
information about events that have occurred in the ICs.
Events are triggered by a status change in the monitored
signals. When an event bit is set in the event register, the
IRQ signal is asserted (unless IRQ is masked by a bit in
the IRQ mask register). The IRQ is also masked during
power-up and is not released until the event registers
have been read. Each event register is reset to its initial
condition after being read. The IRQ is not released until
all the event registers have been read. New events that
occur during read-out of the event registers are held until
all the event registers have been read to, ensuring that
the host processor does not miss them.
PWR_ON_CMP is an open-drain output used to wake-up
a sleeping baseband. PWR_ON_CMP is activated when
a charger is detected (V CHG_IN is between 4.1V and
10V (MAX8939) or 6.25V (MAX8939A/MAX8939B)) and
the battery voltage is above the UVLO threshold. If the
battery has already reached the UVLO upper threshold,
the charger is detected by a rising edge. When such an
until the programmed value, the charge current is not
switched off, but regulated down to a level to maintain
the temperature around the programmed threshold.
UVLO
WATCHDOG_EN
V CHG_IN
V BATT
UPPER THRESHOLD
CHG_EN/DET
RESET TIMER
CHARGER
DISABLED
IRQ
WATHCDOG
TIMER
IRQ
THE WATCHDOG
PWR_ON_CMP
50ms
1ms
HOST READ
OR WRITE
CHARGE
REGISTERS
t < 5s
t = 5s
TIMER EXPIRES
UVLO AND CHARGER CHARGER
DETECTION EVENT REMOVAL
EVENT
ALL EVENT REGISTERS ALL EVENT
ARE READ. PWR_ON_CMP REGISTERS
AND IRQ ARE CLEARED ARE READ.
IRQ IS CLEARED.
Figure 4. Watchdog Timing Diagram
22
Figure 5. PWR_ON_CMP Sequence
Maxim Integrated
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| MAX8939QEWV+T | 制造商:Maxim Integrated Products 功能描述:SYSTEM POWER - Tape and Reel |
| MAX893LESA | 功能描述:电源开关 IC - USB 1.2A Current-Limited High-Side PCh Switch RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX893LESA+ | 功能描述:电源开关 IC - USB 1.2A Current-Limited High-Side PCh Switch RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX893LESA+T | 功能描述:电源开关 IC - USB 1.2A Current-Limited High-Side PCh Switch RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX893LESA-T | 功能描述:电源开关 IC - USB 1.2A Current-Limited High-Side PCh Switch RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
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