LX1677

Microsemi

Integrated Products Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 4

AMD64 Processor VRM Controller

Copyright

© 2000

Rev 1.1, 2003-03-03

TM

®

ELECTRI CAL CHA RACTERI S TI CS

Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C

otherwise noted and the following test conditions: VCC = 5V, VCCL = 5V, VIN = 12V, Switching Frequency = 500KHz.

LX1677

Parameter

Symbol

Test Conditions

Min

Typ

Max

Units

REGULATOR

ENA = VCC, FB+ = FB-

1

5

9

mA

IC Supply Current

ENA = GND

1

µA

Low Side Driver Operating

Current

ENA = VCC, FB+ = FB-

0.5

1

mA

High Side Driver Operating

Current

ENA = VCC, FB+ = FB-

2

4

mA

ERROR AMPLIFIER: PHASE 1

Input Offset Voltage

-6

6

mV

Input Bias Current

-100

100

nA

DC Open Loop Gain

60

70

dB

Input Common Mode Range

CMRR > 50dB

0.8

2.5

V

4.0

Output Voltage Swing

0.15

0.5

V

Unity Gain Bandwidth

UGBW

20

MHz

DIFFERENTIAL AMPLIFIER

Input Offset Voltage

-6

6

mV

Gain

0.99

1

1.01

V/V

Common Mode Rejection Ratio

65

dB

Input Resistance

Measured at FB+ Input

30

K

Ω

Input Common Mode Range

0

3

V

Source / Sink Current

5

mA

4.0

Output Voltage Swing

0.2

V

Unity Gain Bandwidth

UGBW

10

MHz

Slew Rate

SR

5

V/

µs

OSCILLATOR

Maximum Clock Frequency

Ω

0.9

1

1.1

MHz

Minimum Clock Frequency

Ω

150

200

220

KHz

Frequency Stability

4

%

PWM OUTPUT

During Transient Correction Switching

100

Maximum Duty Cycle

Transient Correction Not Switching

40

50

%

Minimum Pulse Width

3000pF Load

60

nS

Dead Time

3000pF Load at 50% of VCCL

50

80

200

nS

VIN = 6V

0.70

VIN = 12

1.40

Ramp Amplitude

VIN = 24V

2.80

V

PHASE 2 INTEGRATING AMPLIFIER

Input Offset Voltage

-6

6

mV

DC Open Loop Gain

70

dB

4.0

Output Voltage Swing

0.15

0.5

V

Unity Gain Bandwidth

UGBW

20

MHz