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参数资料
| 型号： | LTC4002ES8-8.4 |
| 厂商： | Linear Technology |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHARGER SW LI-ION 8SOIC |
| 标准包装： | 100 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 8.9 V ~ 22 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
LTC4002
APPLICATIO S I FOR ATIO
Next, choose the P-channel MOSFET. The Si6435ADQ in
a TSSOP-8 package with R DS(ON) = 42m ? (nom), 55m ?
(max) offers a small solution. The maximum power dissi-
pation with V IN = 5V and V BAT = 4V at 50 ° C ambient
temperature is:
Board Layout Suggestions
When laying out the printed circuit board, the following
considerations should be taken to ensure proper opera-
tion of the LTC4002.
( ) ( )( ) = 0 . 099 W
1 . 5 A
55 m ? 4 V
P D =
2
5 V
GATE pin rise and fall times are 20ns and 50ns respectively
(with C GATE = 2000pF). To minimize radiation, the catch
diode, pass transistor and the input bypass capacitor
? I L ( MAX ) ( ESR )
T J = 50°C + (0.099W)(65°C/W) = 56.5°C
C IN is chosen for an RMS current rating of about 0.8A at
85 ° C. The output capacitor is chosen for an ESR similar to
the battery impedance of about 100m ? . The ripple voltage
on the BAT pin is:
V OUT ( RIPPLE ) =
2
= ( 0 . 96 A ) ( 0 . 1 ? ) = 48 mV
2
C1: Taiyo Yuden TMK325BJ106MM
C2: Taiyo Yuden JMK325BJ226MM
L1: TOKO B952AS-6R8N
The Schottky diode D2 shown in Figure 2 conducts current
when the pass transistor is off. In a low duty cycle case, the
current rating should be the same or higher than the
traces should be kept as short as possible. The positive
side of the input capacitor should be close to the source of
the P-channel MOSFET; it provides the AC current to the
pass transistor. The connection between the catch diode
and the pass transistor should also be kept as short as
possible. The SENSE and BAT pins should be connected
directly to the sense resistor (Kelvin sensing) for best
charge current accuracy. Avoid routing the NTC PC board
trace near the MOSFET switch to minimize coupling switch-
ing noise into the NTC pin.
The compensation capacitor connected at the COMP pin
should return to the ground pin of the IC or as close to it
as possible. This will prevent ground noise from disrupt-
ing the loop stability. The ground pin also works as a heat
sink, therefore use a generous amount of copper around
the ground pin. This is especially important for high V CC
and/or high gate capacitance applications.
charge current. Also it should withstand reverse voltage as
high as V IN .
V IN
5V TO 22V
D1
B330
BAT
R1
C3
0.1 μ F
CER
2
V CC
GATE
3
M1
Si6435ADQ
C1
10 μ F
CER
CHARGE
2k
LTC4002ES8-4.2
L1
D2
B330
STATUS
5
CHRG
SENSE
7
6.8 μ H
R SENSE
1
COMP
BAT
6
68m ?
C C
0.47 μ F
R C
2.2k
NTC
8
T
GND
4
10k
NTC
C2
22 μ F
CER
+
4.2V
Li-Ion
BATTERY
4002 F02
NTC: DALE NTHS-1206N02
Figure 2. 1.5A Single Cell Li-Ion Battery Charger
4002f
14
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