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参数资料
| 型号： | LTC4416IMS#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/12页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR POWERPATH 10-MSOP |
| 标准包装： | 2,500 |
| 系列： | PowerPath™ |
| 应用： | 电池备份，工业/汽车，大电流开关 |
| FET 型： | P 沟道 |
| 输出数： | 2 |
| 内部开关： | 无 |
| 延迟时间 - 开启： | 60µs |
| 延迟时间 - 关闭： | 30µs |
| 电源电压： | 3.6 V ~ 36 V |
| 电流 - 电源： | 130µA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 带卷 (TR) |
LTC4416/LTC4416-1
APPLICATIO S I FOR ATIO
V FAIL = V ETH ?
= 1 . 222 V ?
= 13 . 51 V
V RESTORE = V ETH ?
= 1 . 222 V ?
= 12 . 07 V
C GS ? ? V
= t E ( OFF ) +
V OUT
LTC4416-1
V IN
Overvoltage
R2 A + R2 C|| R2E
R 2 C || R 2 E
221k + 24.9k || 187k
24 . 9 k || 187 k
R2 A + R2C
R 2 C
221k + 24.9k
244 . 9 k
The over and undervoltage lockout circuits are shown here
working in tandem. It is possible to configure the circuit
for either over or undervoltage lockout by using only one
of the voltage paths and eliminating the components from
the other. Refer to Figure 7 for an LTC4416-1 configured
for overvotlage protection. If the input does not go below
ground, transistor Q1 can be eliminated.
The LTC4416-1 should be used in this configuration rather
than the LTC4416 because the LTC4416-1 will turn-off
rapidly if an over or undervoltage condition is detected.
Refer to Figure 8 for a comparison of the transient response
of the two ICs using the circuit configuration of Figure 6.
The LTC4416 will not turn-off quickly in an overvoltage
or undervoltage condition because the “fast-off” feature
is not enabled. This will cause the output to travel beyond
the desired range.
Figure 9 contains a rapidly changing input voltage on a
much smaller time scale in comparison to Figure 8. The
LTC4416 will require the t E(OFF) time prior to the rapid pull-
up current being applied. The gate voltage will be pulled
high with I G(OFF) which has a minimum current of 500μA.
The discharge time of the gate will be dependent on the
capacitance of the external FET and the initial gate-source
voltage of the circuit. The total time delay will equal:
t DELAY = t E ( OFF ) + t DISCHARGE
I G ( O FF)
20
V OUT
LTC4416
15
10
V OUT
LTC4416-1
5
V OUT
LTC4416
0
0 20 40 60 80
TIME (ms) 4416 F08
Figure 8. Transient Response of the LTC4416 vs the LTC4416-1
Light Load with a Large Capacitor on V OUT
V IN
R2A
221k
R1A
100k
Q1
Q2
13.60
13.55
V IN
LTC4416
LTC4416-1
=C I
V TH2 WITH
HYSTERESIS
LTC4416-1
H1 G1
13.50
13.45
GATE DISCHARGE TIME
? V
G(OFF)
GND
R2C
24.9k
R2E
187k
E1
GND
E2
H2
V1
V S
V2
G2
4416 F07
V OUT
TO
LOAD
13.40
0
0
5
10
t E(OFF)
15 20 25
TIME ( μ s)
30
35 40
4416 F09
Figure 7. LTC4416-1 Configured for Overvoltage Protection
Figure 9. Close Up of the Transient Response of the LTC4416-1
to a Rapidly Rising Input
4416fa
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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