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DESCRIPTION
Demonstration circuit 1575B features the
monolithic overvoltage/overcurrent protector that safe-
guards 2.5V to 5.5V systems from power supply over-
voltage. 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
PERFORMANCE SUMMARY
PARAMETER
Input Voltage
Output Voltage
Overcurrent Threshold
Overcurrent Retry
LTC
4362, a
®
. The LTC4362
IN
(T
= 25°C)
A
CONDITION
JP2: OV/OC
JP2: OV/OC/NV
Input Range for Gate Turn-On
Internal Sense Resistor
LTC4362-2
DEMO MANUAL DC1575B
Monolithic Overvoltage/
Overcurrent Protector
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 (featured on the DC1575B) automatically
restarts after a 130ms delay.
DC1575B demonstrates two protection schemes selected
with a jumper. The first selection is overvoltage and
overcurrent protection. The second selection is overvolt-
age, overcurrent, and negative voltage protection. Also
on the DC1575B is ON control with another jumper, input
LEDs indicating positive or negative input voltage, output
LED and connection for USB protected output.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1575B
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
VALUE
0V to 28V
–30V to 28V
2.1V to 5.8V
1.5A
Auto-Retry
LTC4362-2:
dc1575bfa
1
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Table of Contents
Related Manuals for Linear Technology LTC 4362
Summary of Contents for Linear Technology LTC 4362
- Page 1 A PWRGD L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. pin provides power good monitoring for V .
- Page 2 DEMO MANUAL DC1575B QUICK START PROCEDURE Demonstration circuit 1575B is easy to set up to evaluate b) For overvoltage, overcurrent and negative voltage the performance of the LTC4362. Refer to Figures 1 and 2 protection select OV/OC/NV. for proper measurement equipment setup and follow the 3) Select ENABLE at JP1 to enable the protection.
- Page 3 DEMO MANUAL DC1575B OPERATION The DC1575B is used to evaluate the LTC 4362 in two Protection OV/OC/NV ® protection configurations selected at JP2 for overvoltage The second selection at JP2 is OV/OC/NV protection which and overcurrent protection, or overvoltage, overcurrent, protects against overvoltage, overcurrent and negative and negative voltage protection.
- Page 4 Res., Chip 1k 1/10W 5% 0603 NIC Components Corporation NRC06J102TRF Res., Chip 1.5k 0.06W 5% 0603 Vishay CRCW06031K50JNEA I.C., Overvoltage/Overcurrent Protector Linear Technology Corporation LTC4362CDCB-2 DFN(08)(DCB) 2mm × 3mm XJP1, XJP2 Shunt, 2mm Ctrs. Samtec 2SN-BK-G Note: DC1575B replaces DC1575A due to obsoleted LEDs used in DC1575A.
- Page 5 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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
- Page 6 Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.
- Page 7 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Analog Devices Inc. DC1575B...
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