LT4356MP-1 Linear Technology Corporation, LT4356MP-1 Datasheet
LT4356MP-1
Related parts for LT4356MP-1
LT4356MP-1 Summary of contents
Page 1
... UNDERVOLTAGE A OUT GND TMR 4356mp12 TA01 0.1μF LT4356MP-1/LT4356MP-2 DESCRIPTION The LT ® 4356 surge stopper protects loads from high voltage transients. It regulates the output during an overvoltage event, such as load dump in automobiles, by controlling the gate of an external N-channel MOSFET. The output is limited to a safe value thereby allowing the loads to continue functioning ...
Page 2
... LT4356MP-1/LT4356MP-2 ABSOLUTE MAXIMUM RATINGS , SHDN ................................................ –60V to 100V V CC SNS ............................. V – 30V or –60V FLT, EN ..................................... –0.3V to 80V OUT, A OUT GATE (Note 3) .................................–0. FB, TMR, IN ................................................ –0. EN, FLT ..................................................–3mA OUT PIN CONFIGURATION TOP VIEW FB 1 OUT 2 GATE 3 SNS PACKAGE 10-LEAD PLASTIC MSOP = 125° ...
Page 3
... Maximum Rating condition for extended periods may affect device reliability and lifetime. LT4356MP-1/LT4356MP-2 l The denotes the specifi cations which apply over the full operating = 25° 12V unless otherwise noted CONDITIONS V = Float SHDN + 1.3V, LT4356MP-1 SHDN LT4356MP 0V 1.3V, LT4356MP-2 SHDN LT4356MP-2 = –30V, SHDN Open SNS – ...
Page 4
... LT4356MP-1/LT4356MP-2 TYPICAL PERFORMANCE CHARACTERISTICS Specifi cations are 12V 25°C unless otherwise noted (Shutdown LT4356 (V) CC 4356mp12 G01 I (Shutdown) vs Temperature CC 35 LT4356 –50 – ...
Page 5
... CC 14 OVERVOLTAGE, EARLY WARNING PERIOD 1. 1.3V TMR (V) CC 4356mp12 G16 LT4356MP-1/LT4356MP-2 Δ GATE GATE 14 V OUT 125 (μA) GATE Overvoltage TMR Current vs (V – V ...
Page 6
... LT4356MP-1/LT4356MP-2 TYPICAL PERFORMANCE CHARACTERISTICS Specifi cations are 12V 25°C unless otherwise noted Overvoltage Turn-Off Time vs Temperature 500 OVERVOLTAGE CONDITION V = 1.5V FB 400 300 200 100 0 –50 – 100 TEMPERATURE (°C) 4356mp12 G19 PIN FUNCTIONS A : Amplifi er Output. Open collector output of the auxil- OUT iary amplifi ...
Page 7
... AUXILIARY AMPLIFIER + + IN LT4356MP-1/LT4356MP-2 during fault conditions depends on the voltage difference between the V the FLT pin pulls low to indicate the detection of a fault condition. If the condition persists, the pass transistor turns off when V soon as the fault condition disappears, the pull-up current ...
Page 8
... LT4356MP-1/LT4356MP-2 OPERATION Some power systems must cope with high voltage surges of short duration such as those in automobiles. Load circuitry must be protected from these transients, yet high availability systems must continue operating during these events. The LT4356 is an overvoltage protection regulator that drives an external N-channel MOSFET as the pass transis- tor ...
Page 9
... GATE pin starts to pull high again. This prevents the power MOSFET from being damaged during a long period of overvoltage, such as during load dump in automobiles. LT4356MP-1/LT4356MP-2 Overcurrent Fault The LT4356 features an adjustable current limit that protects against short circuits or excessive load current. ...
Page 10
... LT4356MP-1/LT4356MP-2 APPLICATIONS INFORMATION Fault Timer Current The timer current starts at around 2μA with 0.5V or less increasing linearly to 50μA with 75V ing an overvoltage fault (Figure 1). During an overcurrent fault, it starts at 4μA with 0.5V or less 260μA with 80V across the MOSFET (Figure 2). This ...
Page 11
... V higher than 8V. This allows the use of standard threshold V IN LT4356MP-1/LT4356MP-2 voltage N-channel MOSFETs. For systems with V than 8V, a logic level MOSFET is required since the gate crosses the 1.35V drive can be as low as 4.5V. ...
Page 12
... LT4356MP-1/LT4356MP-2 APPLICATIONS INFORMATION MOSFET stress is the result of power dissipated within the device. For long duration surges of 100ms or more, stress is increasingly dominated by heat transfer; this is a matter of device packaging and mounting, and heatsink thermal mass. This is analyzed by simulation, using the MOSFET thermal model. ...
Page 13
... 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). LT4356MP-1/LT4356MP-2 INPUT R6 100k Figure 6. Auxiliary LDO Output with Optional Current Limit ...
Page 14
... LT4356MP-1/LT4356MP-2 APPLICATIONS INFORMATION SNS 10mΩ Si4435 IRLR2908 V IN 12V D1 D2* 1N5245 SMAJ58CA 15V R6 10k 7 5 SNS GATE LT4356S 9 SHDN 14 A OUT GND TMR TMR *DIODES INC. 0.1μF Figure 8. Overvoltage Regulator with P-channel MOSFET Reverse Input Protection ...
Page 15
... The closest standard value for C TMR TYPICAL APPLICATIONS Wide Input Range 5V to 28V Hot Swap with Undervoltage Lockout V IN LT4356MP-1/LT4356MP-2 Finally, calculate R4 and R5 for the 6V low battery threshold detection Choose 100k for R5 Select 383k for R4. The pass transistor, Q1, should be chosen to withstand ...
Page 16
... LT4356MP-1/LT4356MP-2 TYPICAL APPLICATIONS V IN 24V D2* SMAT70A *DIODES INC D2* SMAJ58A *DIODES INC. 16 24V Overvoltage Regulator Withstands 150V IRF640 10Ω SNS GATE OUT LT4356S 9 SHDN 10 FLT 11 EN GND TMR 4356mp12 TA03 TMR 0.1μF Overvoltage Regulator with Undervoltage Lockout ...
Page 17
... TYPICAL APPLICATIONS Overvoltage Regulator with Low Battery Detection and Output Keep Alive During Shutdown V IN 12V D2* SMAJ58A 2.5A, 48V Hot Swap with Overvoltage Output Regulation at 72V and UV Shutdown at 35V V IN 48V D2* SMAT70A LT4356MP-1/LT4356MP SNS 10mΩ IRLR2908 R3 10Ω VN2222 ...
Page 18
... LT4356MP-1/LT4356MP-2 TYPICAL APPLICATIONS 2.5A, 28V Hot Swap with Overvoltage Output Regulation at 36V and UV Shutdown at 15V V IN 28V D2* SMAT70A Overvoltage Regulator with Reverse Input Protection Up to –80V V IN 12V D1 1N4148 SNS 15mΩ FDB3632 R3 10Ω C1 6.8nF 1N4700 V SNS ...
Page 19
... 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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. LT4356MP-1/LT4356MP-2 MS Package 10-Lead Plastic MSOP (Reference LTC DWG # 05-08-1661) 0.889 ± ...
Page 20
... LT4356MP-1/LT4356MP-2 TYPICAL APPLICATION Overvoltage Regulator with Linear Regulator Up to 100mA 2N2905A V IN 12V D2* SMAJ58A R6 100k *DIODES INC. RELATED PARTS PART NUMBER DESCRIPTION LT1641-1/LT1641-2 Positive High Voltage Hot Swap™ Controllers LTC1696 Overvoltage Protection Controller LTC1735 High Effi ciency Synchronous Step-Down ...