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参数资料
| 型号： | LT4356IS-2 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封装： | 0.150 INCH, PLASTIC, SOP-16 |
| 文件页数： | 7/26页 |
| 文件大小： | 231K |
| 代理商： | LT4356IS-2 |
LT4356-1/LT4356-2
15
4356fa
Figure 5
Figure 6. Auxiliary LDO Output with Optional Current Limit
C1
R3
4356 F05
LT4356S
GATE
Q1
R1
D1
IN4148W
RLIM
*4.7Ω
D1*
BAV99
2N2905A OR
BCP53
INPUT
2.5V OUTPUT
≈ 150mA MAX
*OPTIONAL FOR
CURRENT LIMIT
LT4356S
AOUT
IN+
11
12
R6
100k
4356 F06
R4
249k
47nF
R5
249k
10μF
VOUT 1.25
R4 R5
R5
ILIM
0.7
RLIM
APPLICATIONS INFORMATION
The LTC4356 does not need extra compensation compo-
nents at the GATE pin for stability during an overvoltage or
overcurrent event. With transient input voltage step faster
than 5V/μs, a gate capacitor, C1, to ground is needed to
prevent self enhancement of the N-channel MOSFET.
The extra gate capacitance slows down the turn off time
during fault conditions and may allow excessive current
during an output short event. An extra resistor, R1, in series
with the gate capacitor can improve the turn off time. A
diode, D1, should be placed across R1 with the cathode
connected to C1 as shown in Figure 5.
Reverse Input Protection
A blocking diode is commonly employed when reverse
input potential is possible, such as in automotive applica-
tions. This diode causes extra power loss, generates heat,
and reduces the available supply voltage range. During
cold crank, the extra voltage drop across the diode is
particularly undesirable.
The LT4356 is designed to withstand reverse voltage
without damage to itself or the load. The VCC, SNS, and
SHDN pins can withstand up to 60V of DC voltage below
the GND potential. Back-to-back MOSFETs must be used
to eliminate the current path through their body diodes
(Figure 7). Figure 8 shows the approach with a P-Channel
MOSFET in place of Q2.
Figure 7. Overvoltage Regulator with N-channel MOSFET
Reverse Input Protection
CTMR
0.1μF
RSNS
10mΩ
Q1
IRLR2908
Q2
IRLR2908
VIN
12V
VOUT
12V, 3A
CLAMPED
AT 16V
4356 F07
LT4356S
GND
TMR
10
1
OUT
SNS
3
5
SHDN
7
AOUT
11
IN+
12
VCC
6
EN
FLT
FB
9
8
2
D2*
SMAJ58CA
R2
4.99k
R1
59k
GATE
4
R7
10k
R5
1M
Q3
2N3904
D1
1N4148
R3
10Ω
R4
10Ω
*DIODES INC.
Auxiliary Amplier
An uncommitted amplier is included in the LT4356 to
provide exibility in the system design. With the negative
input connected internally to the 1.25V reference, the am-
plier can be connected as a level detect comparator with
external hysteresis. The open collector output pin, AOUT,
is capable of driving an opto or LED. It can also interface
with the system via a pull-up resistor to a supply voltage
up to 80V. Another use is to implement undervoltage
lockout, as shown in the typical application “Overvoltage
Regulator with Undervoltage Lockout.” In shutdown, the
auxiliary amplier turns off in the LT4356-1 but continues
operating in the LT4356-2.
The amplier can also be congured as a low dropout
linear regulator controller. With an external PNP transistor,
such as 2N2905A, it can supply up to 100mA of current
with only a few hundred mV of dropout voltage. Current
limit can be easily included by adding two diodes and one
resistor (Figure 6).
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT4356IS-2#PBF | 功能描述:IC SURGE STOPPER 16-SOIC RoHS:是 类别:过电压，电流，温度装置 >> 电涌抑制 IC 系列:- 产品培训模块:LT4356 Surge Stopper 产品目录绘图:LT4356 Output Graph LT4356 Series 10-MSOP 标准包装:2,500 系列:- 电压 - 工作:4 ~ 80V 电压 - 箝位:27V，可调 技术:混合技术 功率（瓦特）:- 电路数:1 应用:自动 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) 配用:DC1018B-C-ND - DEMO BOARD FOR LT4356-3DC1018B-B-ND - DEMO BOARD FOR LT4356-2DC1018B-A-ND - DEMO BOARD FOR LT4356-1 |
| LT4356IS-2#TRPBF | 功能描述:IC SURGE STOPPER ADJ 16-SOIC RoHS:是 类别:过电压，电流，温度装置 >> 电涌抑制 IC 系列:- 产品培训模块:LT4356 Surge Stopper 产品目录绘图:LT4356 Output Graph LT4356 Series 10-MSOP 标准包装:2,500 系列:- 电压 - 工作:4 ~ 80V 电压 - 箝位:27V，可调 技术:混合技术 功率（瓦特）:- 电路数:1 应用:自动 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) 配用:DC1018B-C-ND - DEMO BOARD FOR LT4356-3DC1018B-B-ND - DEMO BOARD FOR LT4356-2DC1018B-A-ND - DEMO BOARD FOR LT4356-1 |
| LT4356IS-2PBF | 制造商:Linear Technology 功能描述:Surge Protect Adj Regulator 4-80V 60uA |
| LT4356IS-3 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Surge Stopper with Fault Latchoff |
| LT4356IS-3#PBF | 功能描述:IC SURGE STOPPER W/LATCH 16SOIC RoHS:是 类别:过电压，电流，温度装置 >> 电涌抑制 IC 系列:- 产品培训模块:LT4356 Surge Stopper 产品目录绘图:LT4356 Output Graph LT4356 Series 10-MSOP 标准包装:2,500 系列:- 电压 - 工作:4 ~ 80V 电压 - 箝位:27V，可调 技术:混合技术 功率（瓦特）:- 电路数:1 应用:自动 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) 配用:DC1018B-C-ND - DEMO BOARD FOR LT4356-3DC1018B-B-ND - DEMO BOARD FOR LT4356-2DC1018B-A-ND - DEMO BOARD FOR LT4356-1 |
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