TC646B View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

TC646B

PWM Fan Speed Controllers With Auto-Shutdown, Fan Restart and FanSense™ Technology for Fault Detection

Microchip Technology 

TC646B/TC648B/TC649B

1.0 ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings†

Supply Voltage (VDD) .......................................................6.0V

Input Voltage, Any Pin................(GND - 0.3V) to (VDD +0.3V)

Operating Temperature Range ....................- 40°C to +125°C

Maximum Junction Temperature, TJ ........................... +150°C

ESD Protection on all pins ........................................... > 3 kV

† Notice: Stresses above those listed under “Maximum

Ratings” may cause permanent damage to the device. This is

a stress rating only and functional operation of the device at

those or any other conditions above those indicated in the

operational listings of this specification is not implied. Expo-

sure to maximum rating conditions for extended periods may

affect device reliability.

PIN FUNCTION TABLE

Name

VIN

CF

VAS

GND

SENSE/NC

FAULT/OTF

VOUT

VDD

Function

Analog Input

Analog Output

Analog Input

Ground

Analog Input.

No Connect (NC) for TC648B

Digital (Open-Drain) Output

OTF for TC648B

Digital Output

Power Supply Input

ELECTRICAL CHARACTERISTICS

Electrical Specifications: Unless otherwise specified, all limits are specified for -40°C < TA < +85°C, VDD = 3.0V to 5.5V.

Parameters

Sym

Min

Typ

Max

Units

Conditions

Supply Voltage

Supply Current, Operating

VDD

3.0

—

5.5

IDD

—

200

400

Supply Current, Shutdown Mode

IDD(SHDN)

—

30

—

VOUT Output

Sink Current at VOUT Output

Source Current at VOUT Output

VIN, VAS Inputs

Input Voltage at VIN for 100% PWM

Duty Cycle

IOL

IOH

VC(MAX)

1.0

5.0

2.45

—

—

2.60

Over-Temperature Indication

Threshold

VOTF

VC(MAX) +

20 mV

Over-Temperature Indication

VOTF-HYS

80

Threshold Hysteresis

VC(MAX) - VC(MIN)

VC(SPAN)

1.3

1.4

Hysteresis on Auto-Shutdown

VHAS

—

70

Comparator

Auto-Shutdown Threshold

Voltage Applied to VIN to Ensure

Shutdown Mode

VAS

VC(MAX) -

—

VC(SPAN)

VSHDN

—

—

Voltage Applied to VIN to Release

Shutdown Mode

VREL

VDD x 0.19

—

Hysteresis on VSHDN, VREL

VHYST

—

0.03 X

VDD

VIN, VAS Input Leakage

IIN

- 1.0

—

Note 1: Ensured by design, tested during characterization.

2: For VDD < 3.7V, tSTARTUP and tMP timers are typically 13/f.

—

—

2.75

1.5

—

VC(MAX)

VDD x 0.13

—

—

+1.0

V

µA Pins 6, 7 Open,

CF = 1 µF, VIN = VC(MAX)

µA Pins 6, 7 Open,

CF = 1 µF, VIN = 0.35V

mA VOL = 10% of VDD

mA VOH = 80% of VDD

V

V For TC646B and TC648B

mV For TC646B and TC648B

V

mV

V

V

V VDD = 5V

V

µA Note 1

 2003 Microchip Technology Inc.

DS21755B-page 3

Share Link: