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| 型号： | MAX8934GETI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 21/29页 |
| 文件大小： | 0K |
| 描述： | IC LI BATT CHARGER DUAL 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 系列： | * |
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MAX8934G
Dual-Input Linear Charger, Smart Power Selector
with Advanced Battery Temperature Monitoring
1.5
V ISET
MONITORING THE BATTERY
CHARGE CURRENT WITH V ISET
charge-termination threshold (I DONE ) and the charger is
in voltage mode. The charger exits the DONE state, and
fast-charge resumes, if the battery voltage subsequently
drops 104mV, or if input power or CEN is cycled. When
the MAX8934G is used in conjunction with a F P, con-
nect a pullup resistor between DONE and the logic I/O
voltage to indicate charge status to the F P. Alternatively,
DONE can sink up to 20mA for an LED indicator.
Fault Output ( FLT ) and Charge Timer
FLT is an open-drain, active-low output that goes low
during a battery fault. The fault state occurs when either
the prequal or fast-charge timer expires. The prequal
and fast-charge fault timers are set by C CT :
0
t PQ
PREQUAL: = 180min ×
C CT
0.068 F F
DISCHARGING
0
2000 (1.5V/RISET)
t FC
FAST CHARGE: = 300min ×
C CT
0.068 F F
BATTERY CHARGING CURRENT (A)
Figure 4. Monitoring the Battery Charge Current with VISET
fast-charge current setting. Note that if charge current
falls to I DONE as a result of the input or thermal limiter,
the charger does not enter the DONE state. For the char-
ger to enter the DONE state, the charge current must be
less than I DONE , the charger must be in voltage mode,
and the input or thermal limiter must not be reducing the
charge current. The charger exits the DONE state, and
fast-charge resumes if the battery voltage subsequently
drops 104mV or if CEN is cycled.
Charge Status Outputs
Charge Output ( CHG )
CHG is an open-drain, active-low output that is low dur-
ing charging. CHG is low when the battery charger is in
its prequalification and fast-charge states. When charge
current falls to the charge termination threshold (I DONE )
and the charger is in voltage mode, CHG goes high
impedance. CHG goes high impedance if the thermistor
causes the charger to enter temperature suspend mode.
When the MAX8934G is used with a microprocessor ( F P),
connect a pullup resistor between CHG and the logic I/O
voltage to indicate charge status to the F P. Alternatively,
CHG can sink up to 20mA for an LED indicator.
Charge DONE Output ( DONE )
DONE is an open-drain, active-low output that goes
low when charging is complete. The charger enters its
DONE state 15s after the charge current falls to the
Maxim Integrated
TOP ? OFF:t TO = 15s
While in fast-charge mode, a large system load or device
self-heating can cause the MAX8934G to reduce charge
current. Under these circumstances, the fast-charge
timer adjusts to ensure that adequate charge time is still
allowed. Consequently, the fast-charge timer is slowed
by 2x if charge current is reduced below 50% of the pro-
grammed fast-charge level. If charge current is reduced
to below 20% of the programmed level, the fast-charge
timer is paused. The fast-charge timer is not adjusted
if the charger is in voltage mode where charge current
reduces due to current tapering under normal charging.
To exit a fault state, toggle CEN or remove and reconnect
the input source(s). Note also that thermistor out of range
or on-chip thermal-limit conditions are not considered
faults. When the MAX8934G is used in conjunction with a
F P, connect a pullup resistor between FLT and the logic
I/O voltage to indicate fault status to the F P. Alternatively,
FLT can sink up to 20mA for an LED indicator.
Thermistor Monitor
The MAX8934G thermistor monitor is configured to
execute JEITA recommendations regarding Li+/Li-Poly
battery charging by adjusting the fast charge current
and/or the charge termination voltage accordingly (see
Figure 6 ). Connect the THM input to an external negative
temperature coefficient (NTC) thermistor to monitor bat-
tery or system temperature. Since the thermistor monitor-
ing circuit employs an external bias resistor from THM
to THMSW, the thermistor is not limited only to 10k I (at
21
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8934GETI+ | 功能描述:电池管理 Dual Linear Charger Smart Power Selector 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 |
| MAX8934GETI+CAK | 功能描述:电池管理 Dual Input Linear Chargers Smart Power Selector 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 |
| MAX8934GETI+T | 功能描述:电池管理 Dual Linear Charger Smart Power Selector 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 |
| MAX8936EVKIT+ | 制造商:Maxim Integrated Products 功能描述:NULL TRIM FOR PQ69Z - Boxed Product (Development Kits) |
| MAX8936EWE+T | 制造商:Maxim Integrated Products 功能描述:NULL TRIM FOR PQ69Z - Tape and Reel |
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