DC1575A Linear Technology, DC1575A Datasheet

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DC1575A

Manufacturer Part Number
DC1575A
Description
LTC4362-1/LTC4362-2 Overvoltage/Overcurrent Protector With LatchOff/Auto-Retry
Manufacturer
Linear Technology
Series
-r
Datasheets

Specifications of DC1575A

Design Resources
DC1575A Schematic DC1575 Design Files
Main Purpose
Overvoltage/Overcurrent Protection
Embedded
No
Utilized Ic / Part
LTC4362-2
Primary Attributes
-
Secondary Attributes
-
Kit Application Type
Power Management
Application Sub Type
Overvoltage Protection
Features
Demonstrates Two Protection Schemes Selected At JP2, Provides Connection For USB Protection
Lead Free Status / Rohs Status
Not applicable / Not applicable
n
n
n
n
n
n
n
n
n
n
n
n
n
APPLICATIONS
n
n
n
n
n
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT, PowerPath and Hot Swap are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
FEATURES
USB Protection
Handheld Computers
Cell/Smart Phones
MP3/MP4 Players
Digital Cameras
2.5V to 5.5V Operation
Overvoltage Protection Up to 28V
Internal 40mΩ N-Channel MOSFET and 31mΩ R
Avalanche Rated MOSFET Requires No Input
Capacitor or TVS for Most Applications
<1μs Overvoltage Turn-Off, Gentle Shutdown
2% Accurate 5.8V Overvoltage Threshold
20% Accurate 1.5A Overcurrent Threshold
Input Withstands Up to ±25kV HBM ESD with
≥1μF C
Controlled Power-Up dV/dt Limits Inrush Current
Reverse Voltage Protection Driver
Low Current Shutdown
Latchoff (LTC4362-1) or Auto-Retry (LTC4362-2)
After Overcurrent
Available in 8-Lead DFN 2mm × 3mm Package
Protection from Overvoltage and Overcurrent
OUT
V
5V
IN
IN
ON
LTC4362
GND
PWRGD
OUT
436212 TA01a
C
OUT
V
5V
0.5A
OUT
SENSE
DESCRIPTION
The LTC
tor safeguards 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 LTC4362 controls an internal 40mΩ N-channel MOSFET
in series with the input power supply. During overvoltage
transients, the LTC4362 turns off the MOSFET within 1μs,
isolating downstream components from the input supply.
In most applications, the LTC4362 rides through induc-
tive cable transients without requiring transient voltage
suppressors or other external components. An internal
current sense resistor is used to implement overcurrent
protection.
The LTC4362 has a delayed start-up at plug-in and con-
trolled dV/dt ramp-up for inrush current limiting. A PWRGD
pin provides power good monitoring for V
features a soft-shutdown controlled by the ON pin and
drives an optional external P-channel MOSFET for negative
voltage protection. Following an overvoltage condition, the
LTC4362 automatically restarts with a 130ms delay. After
an overcurrent fault, the LTC4362-1 remains off while the
LTC4362-2 automatically restarts after a 130ms delay.
V
IN
5V/DIV
®
, V
4362 monolithic overvoltage/overcurrent protec-
OUT
Overcurrent Protector
Output Protected from Overvoltage at Input
LTC4362-1/LTC4362-2
C
OUT
1.2A Overvoltage/
= 10μF
0.2μs/DIV
V
V
OUT
IN
436212 TA01b
IN
. The LTC4362
436212fa
1

Related parts for DC1575A

DC1575A Summary of contents

Page 1

... MP3/MP4 Players n Digital Cameras L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and ThinSOT, PowerPath and Hot Swap are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION Protection from Overvoltage and Overcurrent ...

Page 2

LTC4362-1/LTC4362-2 ABSOLUTE MAXIMUM RATINGS (Notes 1 and 2) Bias Supply Voltage IN to OUT (Note 3) ................................. –0.3V to 28V Input Voltages SENSE to OUT (Notes 3 and 4) .............. –0.3V to 28V ON ........................................................... –0. Output Voltages ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER Supplies V Input Voltage Range IN V Input Undervoltage Lockout IN(UVL) I Input Supply Current IN Thresholds V IN Pin Overvoltage Threshold IN(OV) ΔV Overvoltage Hysteresis OV Input ...

Page 4

LTC4362-1/LTC4362-2 TYPICAL PERFORMANCE CHARACTERISTICS Specifi cations are 25° 5V Input Supply Current vs Input Voltage 1000 100 (V) ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS Specifi cations are 25° 5V Normal Start-Up Sequence V IN 5V/DIV V OUT 5V/DIV I CABLE 0.5A/DIV 436212 G10 20ms/DIV FIGURE 4 CIRCUIT R = 150mΩ 0.7μH ...

Page 6

LTC4362-1/LTC4362-2 BLOCK DIAGRAM IN GATEP 200k ON + – 1V 5μA OPERATION Mobile devices like cell phones and MP3/MP4 players have highly integrated subsystems fabricated from deep submicron CMOS processes. The small form factor is accompanied by low absolute maximum ...

Page 7

OPERATION If the voltage at the IN pin exceeds 5.8V (V internal N-channel MOSFET is turned off quickly to protect the load. The incoming power supply must remain below 5.7V (V – ΔV ) for the duration of the start-up ...

Page 8

LTC4362-1/LTC4362-2 APPLICATIONS INFORMATION above 1. for more than 500μs. After reset, the ON(TH) LTC4362-1 goes through the start-up cycle. In applications not requiring the overcurrent protection, tie SENSE and the exposed pad to the IN pin. PWRGD Output ...

Page 9

APPLICATIONS INFORMATION WALL ADAPTOR AC/ CABLE CABLE WALL ADAPTOR AC/ CABLE CABLE Thermal Shutdown The internal N-channel MOSFET is protected by a thermal shutdown circuit. If its temperature ...

Page 10

LTC4362-1/LTC4362-2 APPLICATIONS INFORMATION Figure 5 shows an input transient after an overcurrent. The current in L will cause V to overshoot and avalanche IN IN the internal N-channel MOSFET to C TURN-OFF V IN 10V/DIV V OUT OVERCURRENT 5V/DIV I ...

Page 11

APPLICATIONS INFORMATION C is the decoupling capacitor of the protected circuit OUT and its value is largely determined by the circuit require- ments. Using a larger C works with L OUT the dV/dt at OUT, allowing time for the LTC4362 ...

Page 12

LTC4362-1/LTC4362-2 PACKAGE DESCRIPTION 0.70 0.05 1.35 0.05 3.50 0.05 1.65 0.05 2.10 0.05 PACKAGE OUTLINE 0.25 0.05 0.45 BSC 1.35 REF RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED 12 DC Package 8-Lead ...

Page 13

... Revised Overcurrent in the Applications Information section. 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. ...

Page 14

... On-Resistance, Low Reverse Leakage Current, 18mV Regulated Forward Voltage (LTC4413-2 with Overvoltage Protection Sensor) www.linear.com ● V OUT 5V 0.5A C OUT 10μF D1 LN1351CTR : 3μ 2.0V to 45V 0. OUT : 3μ 1.6V to 20V 0. OUT LT 0111 REV A • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2010 436212fa ...

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