MCP8026 datasheet(29/64 Pages) MICROCHIP

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 2016 Microchip Technology Inc.

DS20005339B-page 29

MCP8025/6

4.2.5.3

Temperature Supervisor

An integrated temperature sensor self-protects the

device circuitry. If the temperature rises above the

overtemperature shutdown threshold, all functions are

turned off. Active operation resumes when the

temperature has cooled down below a set hysteresis

value and the fault has been cleared by toggling CE.

It is desirable to signal the microcontroller with a

warning

message

before

the

overtemperature

threshold is reached. When the Thermal Warning

Temperature set point is exceeded, a warning message

will be sent to the host microcontroller. The

microcontroller should take appropriate actions to

reduce the temperature rise. The method to signal the

microcontroller is through the DE2 pin.

4.2.5.4

Internal Function Block Status

Table 4-1 shows the effects of the CE pin, the faults and

the SLEEP bit upon the functional status of the internal

blocks of the MCP8025/6.

TABLE 4-1:

INTERNAL FUNCTION BLOCK STATUS

System State

Fault

Conditions

Sleep

CE = 0, SLEEP = 1

—— W ———

—

Standby

(MCP8025)

CE = 0

SLEEP = 0

— —

Standby

(MCP8026)

CE = 0

SLEEP = 0

—A

— —

Operating

CE = 1, ILIMIT_OUT = 1

AAAA

Faults

CE = 1

ILIMIT_OUT = 0

Driver OTP

TJ > 160°C

—————

VDD UVLO

VIN  5.5V

—

———

Buck Input UVLO

VIN  4V

—————

Buck Output Brownout

VBUCK < 80% (Brownout)

—

— — —

5V LDO UVLO

VOUT5  4V

—

Driver OVLO (MCP8025)

VIN  20V

AAAA

—

System OVLO

VIN  32V

—————

MOSFET UVLO

VHS[A:C] <8V, VLS[A:C] < 8V

AAAA

—

MOSFET OCP

VDrain-Source > EXTOC<1:0> setting AAAA — A

Warnings

CE = 1

ILIMIT_OUT = 1

Buck OCP

IBUCK Input > 2.5A Peak

AAAA

Buck Output

Undervoltage

VBUCK < 90%

AAAA

Driver Temperature

TJ >72% TSD_MIN

(115°C for 160°C Driver OTP)

AAAA

Config Lost (BORW)

Set at initial power-up

or when VDD <UVLOBK_STOP

AAAA

Legend:

“A” = ACTIVE (ON), “—” = INACTIVE (OFF), “W” = WAKEUP (from Sleep), “R” = RECEIVER ONLY

OCP = Overcurrent Protection

OTP = Overtemperature Protection

UVLO = Undervoltage Lockout

OVLO = Overvoltage Lockout

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