参数资料
型号: LTC4000IGN#TRPBF
厂商: Linear Technology
文件页数: 26/40页
文件大小: 0K
描述: IC CHARGER BATTERY 28-SSOP
产品培训模块: LTC4000 60V Battery Charging Controller and Power Management
标准包装: 2,500
系列: PowerPath™
功能: 充电管理,电源管理
电池化学: 多化学
电源电压: 3 V ~ 60 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 28-SSOP(0.154",3.90mm 宽)
供应商设备封装: 28-SSOP
包装: 带卷 (TR)
LTC4000
APPLICATIONS INFORMATION
I CLIM(MAX) =
=
= 10A
R VM1 = ?
? 1 ? ? 100k ? ≈ 1.10M ?
R IS =
= 5m ?
I CLIM(TRKL) = 0.25μA ?
= 1.25A
R BFB1 = ?
? 1 ? ? 133k ? ≈ 1.13M ?
DESIGNEXAMPLE
In this design example, the LTC4000 is paired with the
LT3845A buck converter to create a 10A, 3-cell LiFePO 4
battery charger. The circuit is shown on the front page
and is repeated here in Figure 14.
? The input voltage monitor falling threshold is set at
14.3V according to the following formula:
? 14.3V ?
? 1.193V ?
? The IL pin is left open such that the voltage on this pin
is >1.05V. The regulation voltage on the IIMON pin is
clamped at 1.0V with an accurate internal reference.
Therefore, the input current limit is set at 10A according
to the following formula:
0.050V
10A
? R CL is set at 24.9kΩ such that the voltage at the CL pin
is 1.25V. Similar to the IIMON pin, the regulation voltage
on the IBMON pin is clamped at 1V with an accurate
internal reference. Therefore, the charge current limit
is set at 10A according to the following formula:
0.050V  0.050V
R CS 5m ?
? The trickle charge current level is consequently set at
1.25A, according to the following formula:
24.9k ?
5m ?
? The battery float voltage is set at 10.8V according to
the following formula:
? 10.8 ?
? 1.136 ?
? The bad battery detection time is set at 43 minutes
according to the following formula:
C TMR (nF) = t BADBAT (h) ? 138.5 =
43
60
? 138.5 = 100nF
15V TO 60V
5m
IN
SHDN
LT3845A
V C
OUT
100μF
Si7135DP
12V, 15A
14.7k
47nF
10M
1.15M
5m
RST
ITH
CC
IID IGATE
CSP
CSN
Si7135DP
1.10M
1μF
CLN
IN
BGATE
BAT
OFB
100k
3.0V
10nF
VM
ENC
CHRG
FLT
IIMON
IBMON
LTC4000
FBG
BFB
NTC
127k
133k
1.13M
10.8V FLOAT
10A MAX CHARGE
CURRENT
10nF
TMR
IL
0.1μF
CL
22.1k
CX
22.1k
GND
BIAS
1μF
10k
10k
3-CELL Li-Ion
BATTERY PACK
NTHS0603
N02N1002J
4000 F14
Figure 14. 48V to 10.8V at 10A Buck Converter Charger for Three LiFePO 4 Cells
4000fb
26
For more information www.linear.com/LTC4000
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