EMC2104 datasheet(14/101 Pages) SMSC

14 / 101 page

Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown

Datasheet

Revision 1.74 (05-08-08)

SMSC EMC2104

DATASHEET

Chapter 3 Electrical Specifications

Note: Stresses above those listed could cause permanent damage to the device. This is a stress

rating only and functional operation of the device at any other condition above those indicated

in the operation sections of this specification is not implied. When powering this device from

laboratory or system power supplies, it is important that the Absolute Maximum Ratings not be

exceeded or device failure can result. Some power supplies exhibit voltage spikes on their

outputs when the AC power is switched on or off. In addition, voltage transients on the AC

power line may appear on the DC output. If this possibility exists, it is suggested that a clamp

circuit be used.

Note 3.1

All voltages are relative to ground.

Note 3.2

The Package Power Dissipation specification assumes a recommended thermal via design

consisting of four 12mil vias connected to the ground plane with a 2x2mm thermal landing.

3.1

Electrical Specifications

Table 3.1 Absolute Maximum Ratings

Voltage on 5V tolerant pins

-0.3 to 6.5

Voltage on VDD pin

-0.3 to 4

Voltage on 2V tolerant pins

-0.3 to 2.5

Voltage on any other pin to GND

-0.3 to VDD + 0.3

Package Power Dissipation See Note 3.1

1 up to TA = 85°C

Junction to Ambient (

JA) See Note 3.2

°C/W

Operating Ambient Temperature Range

-40 to 85°C

°C

Storage Temperature Range

-55 to 150

°C

ESD Rating, All Pins, HBM

2000

Table 3.2 Electrical Specifications

VDD = 3V to 3.6V, VDD_5V = 4.5V to 5.5V, TA = -40°C to 85°C, all Typical values at TA = 27°C unless otherwise

noted.

CHARACTERISTIC

SYMBOL

MIN

TYP

MAX

UNIT

CONDITIONS

DC Power

Supply Voltage

VDD

33.3

3.6

Supply Current

(active)

IDD

4 Conversions / second -

Dynamic Averaging Enabled

Fan Driver enabled at max PWM

frequency

Supply Current

IDD

500

750

1 Conversions / second-

Dynamic Averaging disabled,

Fan Driver disabled.

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