L6245 datasheet(6/15 Pages) STMICROELECTRONICS

6 / 15 page

ELECTRICAL CHARACTERISTICS (VS = 5V, Tj =25

°C; unless otherwise specified)

Power Supply Characteristics

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Units

Supply Voltage

VS =VP =VCC

4.5

5.5

ID-READY

ID_IDLE

ID_SLEEP

Quiescent Current Dissipation

No load attached VCM and Spin

drivers enab.

VCM driver disabled Spin driver

enabled

VCM and Spin drivers disabled

VCM Driver (Notes 1, 2)

IOS

Maximum Load Current

(Seeking)

Output Devices A, B, E, F (Fig. 1)

0.3

IOT

Maximum Load Current

(Traking)

Output Devices C, D (Fig. 1)

0.1

RDS(on)

Source & Sink Out ON

Resistance

Output Devices A, B, E, F

Tj = 125

°C (Fig. 1)

Ω

RDS(on)

Sink Out On Resistance

Output Devices C, D

Tj = 125

°C (Fig. 1)

2.4

Ω

RDS(on)

Sink Out On Resistance

Parking Device Tj = 125

°C12

Ω

Body Diode Forward Drop

I = 0.3A

1.5

Vjump

Jump Discontinuity (**)

Rsense = 2.01

Ω

VDB

Deadband Discontinuity (*)

Rsense = 2.01

Ω

6mV

VCMOS

Offset (***)

Rsense = 2.01

Ω

(*) The range of input voltages applied to the VCM_CMD pin (with respect to VREF) for which only negligible current is present in the load. This

deadband voltage (VDB) can be expressed either in mV or in LSBs, where one LSB is equal to 11.7mV.

(**) A condition in which the transfer characteristic (i.e., load current vs. VCM_CMD-VREF) exhibits a slope which is significantly grater than the

desired value. The range of currents for which this condition exists is termed IJUMP. This current is referred o the VCM_CMD input according

to the following equation: VJUMP = IJUMP x 3 x RSENSE

In this document, RSENSE is assumed to be 2.01

Ω. VJUMP can be expressed either in mV or in LSBs, where one LSB is equal to 11.7mV.

(***) The value of VCM_CMD (with respect to VREF) for which the load current is zero. In parts which exihibit a DEADBAND dicontinuity, the

offset is defined to be at the midpoint of the deadband region. RSENSE is assumed to br 2.01

Ω.

VCM Current sense amplifier (ISENSE)

Voff

Output Offset Voltage

VCM_RS2 Shorted to GND O/S is

V(Isense) -Vref

–50

Closed Loop Voltage Gain

3V/V nominal

2.85

3.15

V/V

PSRR

Power Supply Rejection Ratio

at DC

Banwwidth

200

KHz

VOR

Output Range

VCC = 4.5V (note 4)

–0.2

3.5

VCM Full wave rectifying amplifier

Input Bias Current

VCM_CMD = Vref

µA

Iimp

Input Impedance

Impedance seen at VCM_CMD

wrt Vref

Ω

Closed Loop Gain

0.320

0.347

V/V

PSRR

Power Supply Rejection Ratio

at DC

GBW

Unity Gain Bandwidth

200

KHz

CMR

Input Common Mode Range

VCM_CMD pin

0.3

3.7

VOR

Output Range

L6245

6/15

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