VRK81B080CS

Programmable, 80A Single Output DC/DC Converter

www.cd4power.com

FEATURES

Meets AMD K8 requirements

DAC Programmable output voltage

Power good output

Differential remote sense

Remote enable

Supervisory functions

Latch off overcurrent

Short circuit protection

Tri-state output when disabled

Dynamic VID capability

SMBus temperature monitor

DESCRIPTION

VRK81B080CS is designed to meet the fast load

transients required by AMD 64-bit processors

and is fully compliant with the latest AMD64™

processor power specifications. High efficiency of

85% at full load for reduced power dissipation to

simplify system thermal management. Packaged

in a compact design, VRK81B080CU is ideal for use

in a wide variety of server applications.

SELECTION GUIDE

Order Code

Input Voltage

Output Voltage

Output

Current

Efficiency

V (NOM.)

V

A

% (TYP.)

VRK81B080CS

12

0.8-1.55

80

85

INPUT CHARACTERISTICS

Parameter

MIN.

TYP.

MAX.

Units

Input voltage operating range

10.2

12.0

13.2

V

Under voltage lockout

Turn-on threshold

6.5

6.9

7.3

Turn-off threshold

5.4

6.0

6.6

Hysteresis voltage

0.7

0.9

1.1

Maximum input current

11

A

13

No-load input current

Enable state, no load

100

200

400

mA

Disabled input current

Disabled state

10

20

50

Enable - positive logic

On state range

0.8

5

V

Off state range

-0.3

0.4

OUTPUT CHARACTERISTICS

Parameter

MIN.

TYP.

MAX.

Units

Voltage set point

5-Bit DAC controlled

0.800

1.55

V

Line regulation

-5

0

5.0

mV

Load regulation

0.6

mΩ

Voltage total regulation DC

VID-50mV

VID+50mV

V

20MHz bandwidth, using

recommended output capacitors

8.4

mVp-p

Current operating range

0

80

A

Efficiency

83

85

%

Turn-on time

50

mS

Recommended bulk output

capacitance

560μF, 4V alum poly

8

EA

10μF, 1206 X7R ceramic

25

EA

GENERAL CHARACTERISTICS

Parameter

MIN.

TYP.

MAX.

Units

Semiconductor junction

temperature

Package rated to 150ºC

115

ºC

Material flammability

UL 94V-0

MTBF

Calculated (RAC PRISM)

1.303

Switching frequency

Per phase

300

KHz

TEMPERATURE CHARACTERISTICS

Parameter

MIN.

TYP.

MAX.

Units

Storage temperature range

Non-condensing

-40

70

ºC

Operating temperature

range

See derating graph

0

60

PROTECTION CHARACTERISTICS

Parameter

MIN.

TYP.

MAX.

Units

Output overcurrent

shutdown

Latching

85

120

A

Overvoltage Indication,

CBOUT

2.1

V

2. Output ripple voltage is specified when measured with recommended capacitance at the output of the converter

.