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参数资料
| 型号： | LTC4069EDC-4.4#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封装： | 2 X 2 MM, LEAD FREE, PLASTIC, MO-229WCCD-2, DFN-6 |
| 文件页数： | 2/16页 |
| 文件大小： | 197K |
| 代理商： | LTC4069EDC-4.4#PBF |
LTC4069-4.4
10
406944fa
OPERATION
straight from constant-temperature mode. Regardless of
mode, the voltage at the PROG pin is proportional to the
current delivered to the battery.
Battery Temperature Monitoring via NTC
The battery temperature is measured by placing a negative
temperature coefcient (NTC) thermistor close to the
battery pack. The NTC circuitry is shown in Figure 3.
To use this feature, connect the NTC thermistor, RNTC,
between the NTC pin and ground and a resistor, RNOM,from
the NTC pin to VCC. RNOM should be a 1% resistor with a
value equal to the value of the chosen NTC thermistor at
25°C (this value is 100k for a Vishay NTHS0603N01N1003J
thermistor). The LTC4069-4.4 goes into hold mode when
the value of the NTC thermistor drops to 0.53 times the
value of RNOM, which corresponds to approximately
40°C, and when the value of the NTC thermistor increases
to 3.26 times the value of RNOM, which corresponds to
approximately 0°C. Hold mode freezes the timer and stops
the charge cycle until the thermistor indicates a return to
a valid temperature. For a Vishay NTHS0603N01N1003J
thermistor, this value is 32.6k which corresponds to
approximately 0°C. The hot and cold comparators each
have approximately 3°C of hysteresis to prevent oscillation
about the trip point.
When the charger is in Hold mode (battery temperature is
either too hot or too cold) the CHRG pin pulses in a 2Hz,
25% duty cycle frequency unless the charge task is nished
or the battery is assumed to be defective. If the NTC pin
is grounded, the NTC function will be disabled.
IF VCC > 3.6V AND
VCC > VBAT + 80mV?
UVLO
UVLO MODE
1/10 FULL CHARGE CURRENT
CHRG STRONG PULL-DOWN
TRICKLE CHARGE MODE
FULL CHARGE CURRENT
CHRG STRONG PULL-DOWN
FAST CHARGE MODE
IS VBAT < 2.9V?
DEFECTIVE BATTERY
IS VBAT < 4.3V?
RECHARGE
NO CHARGE CURRENT
CHRG PULSES (2Hz)
BAD BATTERY MODE
FULL CHARGE CURRENT
CHRG STRONG PULL-DOWN
RECHARGE MODE
CHRG HIGH IMPEDANCE
YES
NO
4069 F02
VBAT ≤ 2.9V
1/4 CHARGE CYCLE
(1.125 HOURS)
VCC < 3V
CHARGE CYCLE
(4.5 HOURS)
1/2 CHARGE CYCLE
(2.25 HOURS)
2.9V < VBAT < 4.3V
VBAT > 4.3V
YES
NO
NO CHARGE CURRENT
CHRG HIGH IMPEDANCE
STANDBY MODE
POWER
ON
BATTERY CHARGING SUSPENDED
CHRG PULSES (2Hz)
NTC FAULT
TEMPERATURE OK
TEMPERATURE
NOT OK
TEMPERATURE NOT OK
Figure 2. State Diagram of LTC4069-4.4 Operation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4069EDC-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Standalone 750mA Li-Ion Battery Charger in 2 × 2 DFN with NTC Thermistor Input |
| LTC4069EDC-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Standalone 750mA Li-Ion Battery Charger in 2 × 2 DFN with NTC Thermistor Input |
| LTC4070 | 制造商:LINEAR 制造商全称:LINEAR 功能描述:Ultralow Voltage Step-Up Converter and Power Manager |
| LTC4070EDDB | 制造商:LINER 制造商全称:Linear Technology 功能描述:Li-Ion/Polymer Shunt Battery Charger System |
| LTC4070EDDB#PBF | 制造商:Linear Technology 功能描述:Battery Charger Li-Ion/Li-Pol 50mA 4.2V 10-Pin DFN EP Bulk 制造商:Linear Technology 功能描述:IC BATTERY CHARGER 50mA DFN-8 制造商:Linear Technology 功能描述:IC, BATTERY CHARGER, 50mA, DFN-8 制造商:Linear Technology 功能描述:IC, BATTERY CHARGER, 50mA, DFN-8; Battery Type:Li-Ion, Li-Polymer; Battery Charge Voltage:4.2V; Charge Current Max:50mA; Battery IC Case Style:DFN; No. of Pins:8; No. of Series Cells:1; Operating Temperature Min:-40C ;RoHS Compliant: Yes |
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