ltc4360-2 Linear Technology Corporation, ltc4360-2 Datasheet

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ltc4360-2

Manufacturer Part Number
ltc4360-2
Description
Ltc4360-1/ltc4360-2 Overvoltage Protection Controller Features
Manufacturer
Linear Technology Corporation
Datasheet
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APPLICATIONS
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L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT, PowerPath, How Swap and No R
Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
FEATURES
2.5V to 5.5V Operation
Overvoltage Protection Up to 80V
No Input Capacitor or TVS Required for Most
Applications
2% Accurate 5.8V Overvoltage Threshold
Controls N-Channel MOSFET
<1μs Overvoltage Turn-Off, Gentle Shutdown
Adjustable Power-Up dV/dt Limits Inrush
Reverse Voltage Protection (LTC4360-2)
Power Good Output
Low Current Shutdown (LTC4360-1)
Available in a Tiny 8-Lead SC70 Package
USB Protection
Handheld Computers
Cell/Smart Phones
MP3/MP4 Players
Digital Cameras
V
5V
IN
Protection from Overvoltage
IN
ON
LTC4360-1
Si1470DH
GATE
GND
PWRGD
SENSE
OUT
are trademarks of Linear Technology
436012 TA01a
C
OUT
V
5V
1.5A
OUT
DESCRIPTION
The LTC
2.5V to 5.5V systems from power supply overvoltage. It is
designed for portable devices with multiple power supply
options including wall adaptors, car battery adaptors and
USB ports.
The LTC4360 controls an external N-channel MOSFET in
series with the input power supply. During overvoltage
transients, the LTC4360 turns off the MOSFET within 1μs,
isolating downstream components from the input supply.
Inductive cable transients are absorbed by the MOSFET
and load capacitance. In most applications, the LTC4360
provides protection from transients up to 80V without
requiring transient voltage suppressors or other external
components.
The LTC4360 has a delayed start-up and an adjustable dV/dt
ramp-up for inrush current limiting. A PWRGD pin provides
power good monitoring for V
age condition, the LTC4360 automatically restarts with a
start-up delay. The LTC4360-1 features a soft shutdown
controlled by the ON pin, while the LTC4360-2 controls an
optional external P-channel MOSFET for negative voltage
protection.
V
Overvoltage Protection
IN
10V/DIV
5V/DIV
®
, V
V
4360 overvoltage protection controller safeguards
GATE
OUT
Output Protected from Overvoltage at Input
LTC4360-1/LTC4360-2
Si1470DH
C
OUT
= 10μF
0.5μs/DIV
IN
. Following an overvolt-
V
V
OUT
IN
Controller
436012 TA01b
436012f
1

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ltc4360-2 Summary of contents

Page 1

... A PWRGD pin provides power good monitoring for V age condition, the LTC4360 automatically restarts with a start-up delay. The LTC4360-1 features a soft shutdown controlled by the ON pin, while the LTC4360-2 controls an optional external P-channel MOSFET for negative voltage protection. Output Protected from Overvoltage at Input ...

Page 2

... For more information on tape and reel specifi cations, go to: 2 Operating Temperature Range LTC4360C ................................................ 0°C to 70°C LTC4360I .............................................–40°C to 85°C Storage Temperature Range .................. –65°C to 150°C Lead Temperature (Soldering, 10 sec)................... 300°C LTC4360-2 8 GATE 7 OUT PWRGD PART MARKING* PACKAGE DESCRIPTION ...

Page 3

... V = 2.5V (LTC4360-1) ON GATE 5V OUT 5V 2.5V ON OUT l (LTC4360- 2.5V (LTC4360- (LTC4360- (LTC4360-2) GATEP 5V 3mA PWRGD 6.5V PWRGD High –5μA IN GATE Step Step PWRGD Low ...

Page 4

... LTC4360-1/LTC4360-2 TYPICAL PERFORMANCE CHARACTERISTICS T = 25° 5V (LTC4360-1) unless otherwise noted Input Supply Current vs Input Voltage 1000 LTC4360 0V, LTC4360-2) ON 100 V = 2.5V ON (LTC4360- 0 (V) IN 436012 G01 PWRGD Voltage vs PWRGD Current 500 400 300 200 100 ...

Page 5

... GATE to GND. An internal clamp limits GATE to 6V above the OUT pin voltage. An internal GATE high comparator controls the PWRGD pin. GATEP (LTC4360-2): Gate Drive for External P-Channel MOSFET. GATEP connects to the gate of an optional external P-channel MOSFET to protect against negative voltages at IN ...

Page 6

... UVLO or overvoltage and the subsequent 130ms start-up delay. After the start-up delay, GATE starts its slow ramp- up and ramps higher than V delay cycle. When that completes, PWRGD pulls low. The LTC4360-2 has a GATEP pin that drives an optional external P-channel MOSFET to provide protection against negative voltages at IN. Start-Up ...

Page 7

... The LTC4360-1 then goes into a low cur- rent sleep mode, drawing only 1.5μA at IN. When ON goes back low, the part restarts with a 130ms delay cycle. GATEP Control (LTC4360-2) GATEP has a 2M resistive pull-down to ground and a 5.8V Zener clamp in series with a 200k resistor to IN. It con- trols the gate of an optional external P-channel MOSFET to provide negative voltage protection ...

Page 8

... IN via the parasitic body diode of the MOSFET. For near zero reverse leakage current protection when GATE is pulled to ground, back-to-back N-channel MOSFETs can be used. Adding an additional P-channel MOSFET controlled by GATEP (LTC4360-2) provides negative input voltage protection down to the BV of the P-channel MOSFET. DSS Another confi ...

Page 9

... I and E AS the Si1470DH most instances, the LTC4360 can . The cur- ADAPTOR ride through such transients without a bypass capacitor, transient voltage suppressor or other external components at IN. of Si1470DH) = 45V. LTC4360-1/LTC4360 OUT CABLE 436012 F04b 5μs/DIV R = 150mΩ 0.7μ ...

Page 10

... OUT will work with OUT OUT also helps to lower OUT due to the discharge of the energy used as an input clamp. DSS SUPPLY IN Si3590DV OUT Si1470DH GND LTC4360-2 LTC4360-1 overshoots if the IN OUT GND 436012 F09 436012f ...

Page 11

... 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. LTC4360-1/LTC4360-2 SC8 Package 8-Lead Plastic SC70 (Reference LTC DWG # 05-08-1639 Rev Ø ...

Page 12

... Forward Voltage (LTC4413-2 with Overvoltage Protection Sensor) www.linear.com ● 5V System Protected from ±24V Power Supplies and Reverse Current FDC6561AN OUT 10μF GATE OUT 5V R1 LTC4360 PWRGD LN1351CTR GATEP GND 436012 TA03 : 3μ 2.0V to 45V 0.6V to 39.5V OUT : 3μ 1.6V to 20V 0.6V to 19.5V OUT LT 0410 • ...

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