MIC69302WR-TR Datasheet MIC69302WR-TR, MIC69302WU, MIC69303YML-TR | P1-P3

dc1575bfa

DEMO MANUAL DC1575B

DESCRIPTION

LTC4362-2:

Monolithic Overvoltage/

Overcurr

ent Protector

Demonstration circuit 1575B features the LTC

4362, a

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 batter

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 over

current

protection.

The L

TC4362 has a delayed start-up at plug-in and con

trolled dV/dt ramp-up for inrush current limiting. A PWRGD

provides power good

monitoring for V

. The LTC4362

PARAMETER CONDITION VALUE

Input Voltage JP2: OV/OC

JP2: OV/OC/NV

0V to 28V

–30V to 28V

Output Voltage Input Range for Gate T

urn-On 2.1V to 5.8V

Overcurrent Threshold Internal Sense Resistor 1.5A

Overcurrent Retry LTC4362-2 Auto-Retry

PERFORMANCE SUMMARY

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.

= 25°C)

dc1575bfa

DEMO MANUAL DC1575B

Demonstration circuit 1575B is easy to set up to evaluate

the performance of the LTC4362. Refer to Figures 1 and 2

for proper measurement equipment setup and follow the

procedure below:

Connect the load and measurement across the OUT

and GND (Figure 1).

2) Select protection type at JP2:

a) For overvoltage and overcurrent protection select

OV/OC.

QUICK START PROCEDURE

b) For overvoltage, overcurrent and negative voltage

protection select OV/OC/NV.

3) Select ENABLE at JP1 to enable the protection.

4) Connect a power supply across V

and GND.

5) For USB protection, connect a USB cable from J2 to

the USB device (Figure 2). Select the protection type

at JP2. Connect a second USB cable from a computer

to J1.

Figure 1. DC1575B Basic Setup

Figure 2. DC1575B USB Protection Setup

SELECT PROTECTION

SELECT ENABLE

–

PROTECTED

OUT

PWRGD

LOAD

SELECT PROTECTION

USB

CABLE

(HOT PLUG)

SELECT ENABLE

USB

CABLE

PC USB

DEVICE

dc1575bfa

DEMO MANUAL DC1575B

OPERATION

The DC1575B is used to evaluate the LTC

4362 in two

protection conﬁgurations selected at JP2 for overvoltage

and overcurrent protection, or overvoltage, overcurrent,

and negative voltage protection. The device in need of

protection is connected to the OUT test point or to the

USB output connector J2. An input supply is connected

at V

or a USB source is connected at J1.

ON Control

The ON pin on the LTC4362 is controlled at JP1. Select

ENABLE to enable the LTC4362, or DISABLE to enter a

low current sleep mode.

Protection OV/OC

The ﬁrst selection at JP2 is OV/OC protection which pro

tects against overvoltage and overcurrent. The LTC4362

turns on an internal N-channel MOSFET when the input

voltage is below the overvoltage threshold. An internal

current sense resistor provides over

current detection.

In the case of an overcurrent, the LTC4362-2 used in the

DC1575B automatically tries to turn the internal MOSFET

back on. An orange input LED indicates if the input supply

is on while a green OUT LED indicates the gate is on and

input is connected to the output.

Protection OV/OC/NV

The second selection at JP2 is OV/OC/NV protection which

protects against overvoltage, overcurrent and negative

voltage. The LTC4362 turns on an internal N-channel

MOSFET when the input voltage is below the overvoltage

threshold. A P-channel MOSFET is driven by the GATEP pin

of the LTC4362 to protect the output against an inadvertent

negative voltage connection at the input. An internal current

sense resistor provides overcurrent detection. In the case

of an overcurrent, the LTC4362-2 used in the DC1575B

automatically retries to turn the internal MOSFET back

on. The orange V

LED indicates if the input supply is on

while a green OUT LED indicates the gate is on and input

is passed over to the output. A red –V

LED indicates if

a negative input voltage is present.

USB Protection

DC1575B also provides connection for USB protection.

First connect a USB device with a USB cable at J2. Select

the protection type at JP2 and match this with JP3. Select

ENABLE at JP1. The USB source can then be connected

at J1.

P1-P3 P4-P6

MIC69302WR-TR

Mfr. #:

Buy MIC69302WR-TR

Manufacturer:

Microchip Technology / Micrel

Description:

LDO Voltage Regulators 3A, Low VIN, Single Supply LDO

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MIC69302WR-TR

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