LTC4360-1 Linear Technology, LTC4360-1 Datasheet

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LTC4360-1

Manufacturer Part Number
LTC4360-1
Description
Overvoltage Protection Controller
Manufacturer
Linear Technology
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
www.DataSheet4U.com
436012 TA01b
436012f
1

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LTC4360-1 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. ...

Page 2

... Bias Supply Voltage (IN) ............................ –0.3V to 85V Input Voltages OUT, ON ................................................... –0. Output Voltages PWRGD .................................................... –0. GATE (Note 3) ........................................ –0.3V to 15V GATEP .................................................... –0.3V to 85V IN to GATEP ........................................... –0.3V to 10V PIN CONFIGURATION LTC4360-1 TOP VIEW IN 1 GND 2 GND 3 GND 4 SC8 PACKAGE 8-LEAD PLASTIC SC70 = 125°C, θ ...

Page 3

... GATE Step Step PWRGD Low l V > V GATE GATE(TH Step 0V to 2.5V (LTC4360-1) ON Note 3: An internal clamp limits V Driving this pin to voltages beyond this clamp may damage the device. www.DataSheet4U.com MIN TYP MAX UNITS 2 1.8 2.1 2.45 V 220 400 μ ...

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

... ON (LTC4360-1): On Control Input. A logic low at ON enables the LTC4360-1. A logic high at ON activates a low current pull-down at the GATE pin and causes the LTC4360-1 to enter a low current sleep mode. An internal 5μA current pulls ON down to ground. Connect to ground or leave open if unused. OUT: Output Voltage Sense Input for Gate Clamp. Connect ...

Page 6

... When V is less than the undervoltage lockout level of IN 2.1V, the GATE driver is held low and the PWRGD pull- down is high impedance. When V ON (LTC4360-1) is held low, a 130ms delay cycle starts. Any undervoltage or overvoltage event OUT V > 5.7V) restarts the delay cycle. This delay allows the ...

Page 7

... GATE is pulled low with a weak pull-down current (40μA) to turn off the external MOSFET gradually, minimizing input voltage transients. 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. ...

Page 8

... LTC4360-1/LTC4360-2 APPLICATIONS INFORMATION MOSFET Confi gurations and Selection The LTC4360 can be used with various external MOSFET confi gurations (see Figure 3). The simplest confi guration is a single N-channel MOSFET. It has the lowest R voltage drop and is thus the most power effi cient solution. ...

Page 9

... 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. www.DataSheet4U.com 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

... LTC4360-1/LTC4360-2 TYPICAL APPLICATION 5V System Protected from ±24V Power Supplies Si3590DV GATE IN OUT LTC4360-2 PWRGD GATEP GND RELATED PARTS PART NUMBER DESCRIPTION LTC2935 Ultralow Power Supervisor with Eight Pin-Selectable Thresholds LT3008 20mA, 45V, 3μA I Micropower LDO Q LT3009 20mA, 3μA I ...

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