VRM9.0 PROGRAMMABLE, MULTI-PHASE,

HIGH PERFORMANCE PWM CONTROLLER

SC1146

© 2000 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320

July 25, 2000

3

The SC1146 is patent pending

O

OUT

I

V

∆

∆

IN

OUT

V

V

∆

∆

ELECTRICAL CHARACTERISTICS (Cont.)

Unless otherwise noted: T

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Bgout Voltage

V

Bgout

Vid = 00000

TBD

1.30

TBD

V

Bgout Impedance

R

O_Bg

3

K

Ω

External Clock Freq. Range

F

ext_CK

.80

8.0

8.5

MHz

Oscillator Frequency

F

OSC

Iref = 250µA

7.6

8.0

8.4

MHz

Internal Clock Freq. Range

F

int_CK

.80

8.0

8.5

MHz

Match DRV0-3

∆=

D

Duty cycle (Avg) = 50%

-1

+1

%

PWM Off Time

Toff

25

%

Overcurrent Comparator,

Comparator, Common Mode

Range

OCC_CMR

3

15

V

OC+I/P bias Current

IB_OC+

Vin = 5V

+75

+250

µ

Α

OC-I/P bias Current

IB_OC-

Vin = 5V

+75

+250

µ

Α

Input Offset Voltage

VOS_OCC

Vin = 5V

10

mV

Feedback Input Impedance

Ri_FB

V

12

ΚΩ

Duty Cycle Range

D

0

75

%

CONVERTER SPECIFICATIONS, Reference Application Circuit

Output Accuracy Over Set

Range

V

OUT

VID 0-4 = 0000-1111

V

-1

+1

%

Load Regulation

V

I

.025

.05

%/A

Line Regulation

V

V

Vcc5v) I

.15

%/V

POWER GOOD SIGNAL

Off Leakage Current

I

leakage_Off

PWRGOOD = Logic High

2

µA

Power Good Max Sink Current

I

Sink_Max

PWRGOOD< = .8V

2

mA

Power Good Threshold

P

wrgood_T_lo

Vout = 1.300V - 1.950V

+100

mV

Voltage Tolerance

P

wrgood_T_Hi

Vout = 2.000V - 3.500V

+150

mV

Note:

(1) This device is ESD sensitive. Use of standard ESD handling precautions is required.