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参数资料
| 型号： | LTC4099EUDC#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/36页 |
| 文件大小： | 0K |
| 描述： | IC USB PWR MANAGER/CHRGR 20-QFN |
| 标准包装： | 91 |
| 系列： | PowerPath™ |
| 功能： | 电源管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 4.35 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WFQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN（3x4） |
| 包装： | 管件 |
| 产品目录页面： | 1341 (CN2011-ZH PDF) |
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LTC4099
TYPICAL PERFORMANCE CHARACTERISTICS
R CLPROG = 3.01k, unless otherwise noted.
T A = 25°C, V BUS = 5V, BAT = 3.8V, R PROG = 1.02k,
Battery Charge Current and
Voltage vs Time
Output Voltage vs Battery Voltage;
Battery Charger Overprogrammed
Suspend LDO Transient Response
(500μA to 1.5mA)
5
1.0
4.4
BATTERY CHARGER SET FOR 1200mA
4
3
2
1
500mA
CHARGER TERMINATION
4-HOUR SETTING
0.8
0.6
0.4
0.2
4.2
4.0
3.8
3.6
3.4
3.2
100mA USB
SETTING
500mA USB
SETTING
I OUT
500μA/DIV
0mA
V OUT
20mV/DIV
AC-COUPLED
500μs/DIV
4099 G36
0
0
1
2
3
4
5 6
7
8
0
3.0
2.4
2.7
3.0
BATTERY VOLTAGE
3.3 3.6 3.9
4.2
TIME (HOURS)
V BUS INPUT LIMIT SET FOR 790mA
BATTERY CHARGER SET FOR 500mA
FLOAT VOLTAGE SET FOR 4.2V
PIN FUNCTIONS
4099 G34
BATTERY VOLTAGE (V)
4099 G35
I BAT =
V PROG
R PROG
OVGATE (Pin 1): Overvoltage Protection Gate Output.
Connect OVGATE to the gate pin of an external N-channel
MOSFET pass transistor. The source of the transistor should
be connected to V BUS and the drain should be connected
to the product’s DC input connector. In the absence of an
overvoltage condition, this pin is driven from an internal
charge pump capable of creating sufficient overdrive to
fully enhance the pass transistor. If an overvoltage condition
is detected, OVGATE is brought rapidly to GND to prevent
damage to the LTC4099. OVGATE works in conjunction
with OVSENS to provide this protection.
NTC (Pin 2): Input to the Negative Temperature Coefficient
Thermistor Monitoring Circuit. The NTC pin connects to
a negative temperature coefficient thermistor which is
typically copackaged with the battery to determine if the
battery is too hot or too cold to charge. If the battery’s
temperature is out of range, charging is paused until the
battery temperature re-enters the valid range. A low drift
bias resistor is required from NTCBIAS to NTC and a
thermistor is required from NTC to ground.
NTCBIAS (Pin 3): NTC Thermistor Bias Output. Connect a
bias resistor between NTCBIAS and NTC, and a thermistor
between NTC and GND.
0
V C (Pin 4): Bat-Track Auxiliary Switching Regulator Control
Output. This pin drives the V C pin of an external Linear
Technology step-down switching regulator. In conjunction
with WALL and ACPR , it will regulate V OUT to maximize
battery charger efficiency.
WALL (Pin 5) : Auxiliary Power Source Sense Input. WALL
is used to determine when power is available from an
auxiliary power source. When power is detected, ACPR is
driven low and the USB input is automatically disabled.
BATSENS (Pin 6): Battery Voltage Sense Input. For proper
operation, this pin must always be connected to BAT. For
best operation, connect BATSENS to BAT physically close
to the Li-Ion cell.
PROG (Pin 7): Charge Current Program and Charge Current
Monitor Pin. Connecting a resistor from PROG to ground
programs the charge current. If sufficient input power
is available in constant-current mode, this pin servos
to one of eight possible I 2 C controllable voltages (see
Table 3). The voltage on this pin always represents the
actual charge current by using the following formula:
? 1030
4099fd
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