MCP1632_14 datasheet(5/34 Pages) MICROCHIP

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 2013 Microchip Technology Inc.

DS20005254A-page 5

MCP1632

Error Amplifier

Source Current

ISOURCE

—

VIN =5V, VREF =1.2V,

VFB = 1.0V, VCOMP =2.0V,

Absolute Value

Current Sense Input

Maximum Current Sense

Signal

VCS_MAX

0.8

0.9

0.97

Set by maximum error amplifier

clamp voltage, divided by 3

(Note 1)

Blanking Time

TBLANK

100

130

Note 1

Delay from CS to VEXT

TCS_VEXT

—

Excluding the blanking time

(Note 1)

Current Sense Input Bias

Current

ICS_B

—-0.1

—

µA

Note 1

PWM Section

Minimum Duty Cycle

DCMIN

——

VFB =VREF + 0.1V, VCS =GND

(Note 1)

Maximum Duty Cycle

DCMAX

Slope Compensation Ramp Generator

Ramp Amplitude

VRAMP

0.8

0.9

VPP

Refer to Section 4.6 “Slope

Compensation”

for details.

DC Offset Low

—

0.15

0.32

0.45

Refer to Section 4.6 “Slope

Compensation”

for details.

DC Offset High

—

1.12

1.22

1.32

Refer to Section 4.6 “Slope

Compensation”

for details.

Ramp Generator Output

Impedance

ZRG

5.5

6.5



Refer to Section 4.6 “Slope

Compensation”

for details.

Internal Driver

RDSon P-channel

RDSon_P

—10



RDSon N-channel

RDSon_N

—7



VEXT Rise Time

TRISE

——

CL = 100 pF

Typical for VIN =3V (Note 1)

VEXT Fall Time

TFALL

——

CL = 100 pF

Typical for VIN =3V (Note 1)

Protection Features

Undervoltage Lockout

UVLO

2.6

—

2.9

VIN falling,

VEXT low state when in UVLO

Undervoltage Lockout

Hysteresis

UVLOHYS

110

180

Thermal Shutdown

TSHD

—150

—°C

Note 1

Thermal Shutdown

Hysteresis

TSHD_HYS

—20

—

°C

Note 1

AC/DC CHARACTERISTICS (CONTINUED)

Electrical Specifications:

Unless otherwise noted, VIN = 3.0V to 5.5V, FOSC =300 kHz, CIN =0.1 µF,

VIN for typical values = 5.0V, TA = -40°C to +125°C.

Parameters

Sym.

Min.

Typ.

Max.

Units

Conditions

Note 1:

Ensured by design. Not production tested.

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