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参数资料
| 型号： | LTC4007EGN#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/24页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHARGER CTRLR 4A 24SSOP |
| 标准包装： | 55 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 6 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-SSOP |
| 包装： | 管件 |
| 产品目录页面： | 1341 (CN2011-ZH PDF) |
LTC4007
OPERATION
Table 1. Truth Table For Indicator States
MODE
Shut down by low adapter voltage
Charging a low bat
Normal charging
Input current limited charging
Charger paused due to thermistor out of range
DCIN
<BAT
>BAT
>BAT
>BAT
>BAT
SHDN
LOW
LOW
LOW
LOW
LOW
ACP**
LOW
HIGH
HIGH
HIGH
HIGH
LOBAT
LOW
LOW
HIGH
HIGH
X
FLAG **
HIGH
HIGH*
HIGH
HIGH*
X
FAULT **
HIGH
HIGH*
HIGH*
HIGH*
LOW
I CL
LOW
HIGH*
HIGH*
LOW
HIGH
TIMER
STATE
Reset
Running
Running
Running
Paused
CHG **
HIGH
LOW
LOW
LOW
LOW
(from
NTC)
Shut down by SHDN pin
Terminated by low-battery fault (Note 1)
X
>BAT
HIGH
LOW
X
HIGH
X
LOW
HIGH
HIGH*
HIGH
LOW
LOW
LOW
Reset
>T/4
HIGH
HIGH
(Faulted)
Timer is reset when FLAG goes low, then
>BAT
LOW
HIGH
HIGH
LOW
HIGH
LOW
>T/4
HIGH
terminates after 1/4 T
after
FLAG =
LOW
(Waiting for
Restart
Terminated by expired timer
>BAT
LOW
HIGH
HIGH
HIGH
HIGH
LOW
>T
HIGH
(Waiting for
Restart
Charge termination defeated
Shut down by undervoltage lockout
X
>BAT +
X
LOW
X
HIGH
X
HIGH
X
HIGH
X
HIGH*
X
LOW
X
Reset
Forced LOW
HIGH*
<UVL
*Most probable condition X = Don’t care, ** Open-drain output HIGH = OPEN with pull-up
Note 1: If a depleted battery is inserted while the charger is in this state,
the charger must be reset to initiate charging.
keep a low forward voltage drop from drain to source. If the
voltage between DCIN and CLN drops to less than 25mV,
comparator I REV or the beginning of the next cycle. The
oscillator uses the equation:
the input FET is turned off slowly. If the voltage between
DCIN and CLN is ever less than –25mV, then the input FET
is turned off in less than 10μs to prevent signi?cant reverse
t OFF =
V DCIN – V BAT
V DCIN ? f OSC
current from ?owing in the input FET. In this condition, the
ACP pin is driven low and the charger is disabled.
Battery Charger Controller
to set the bottom MOSFET on time. The result is a nearly
constant switching frequency over a wide input/output
voltage range. This activity is diagrammed in Figure 1.
The LTC4007 charger controller uses a constant off-time,
current mode step-down architecture. During normal
operation, the top MOSFET is turned on each cycle when
TGATE
OFF
ON
ON
the oscillator sets the SR latch and turned off when the
main current comparator I CMP resets the SR latch. While
the top MOSFET is off, the bottom MOSFET is turned
on until either the inductor current trips the current
BGATE
OFF
INDUCTOR
CURRENT
t OFF
TRIP POINT SET BY ITH VOLTAGE
4006 F01
Figure 1
4007fc
10
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