MCP1790-3002ESLASHEB datasheet(14/34 Pages) MICROCHIP

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MCP1790/MCP1791

DS22075A-page 14

4.0

DEVICE OVERVIEW

The MCP1790/MCP1791 are high input voltage regula-

tors capable of providing up to 70 mA of current at

output voltages up to 5.0V. The devices have an input

voltage operating range from 6.0V to 30V, 48V absolute

max. The MCP1790 devices are 3-pin devices consist-

ing of VIN, VOUT, and GND. The MCP1791 devices

have 5 or more pins which add Shutdown and

Power-Good functions to the MCP1790 device.

4.1

Startup

In the start phase, the device must see at least 6.0V to

initiate operation during power up. In the Power-down

mode, the VIN monitor will be turned off.

4.2

Thermal Shutdown

The regulator has a thermal shutdown. If the thermal

protection

circuit

detects

over

temperature

condition, typically 157°C junction temperature, the

regulator will shut down. The device will recover from

the thermal shutdown when the junction temperature

drops to 137°C (typical).

4.3

Regulator Output Voltage

The MCP1790/MCP1791 regulators are available in

fixed output voltage configurations. The standard

output voltages are 3.0V, 3.3V, and 5.0V.

4.4

External Protection

4.4.1

TRANSIENT VOLTAGE

PROTECTION (LOAD DUMP)

The regulator is capable of withstanding a 48V

(43.5V ±10) load dump transient for a duration of

180 ms

and

repetition

rate

seconds

(ES-XW7T-1A278-AC, Ford Motor Company, Test

Pulse G Loaded).

While not necessary, good design practice dictates

adding an external transient suppressor, between VBB

and ground, with a low value resistor in series with the

battery supply and the VIN pin, to limit currents and

voltages due to electrical transients. Because of the

regulator startup current, the resistor value should be

less than (VBAT -6V) / 200 mA. For a 12V battery volt-

age, the resistor value should be less than 30 ohms.

4.4.2

REVERSE BATTERY PROTECTION

An external reverse battery blocking diode may be

used to provide polarity protection.

FIGURE 4-1:

MCP1790/MCP1791 Block Diagram.

VIN

Monitoring VIN

Temp

Sensor

VOUT

PWRGD

Soft Start

Delay

Reference

Voltage

Error Amplifier

Logical Block

Delay

Short Circuit

Protection

VIN

Monitoring VOUT

510k

490k

GND

SHDN

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