BEL GRND

NON-ISOLATED DC/DC CONVERTERS
12V Input / Programmable Output / VRM11 Compatible
GRND-40A160 Rev. B
•
High efficiency means less power dissipation
•
Remote on/off
•
Wide input range (10.8 – 13.2V)
•
I2C/SMbus available – consult factory
•
2-Wire Remote sense
•
7 bit VID digital voltage programming.
Description
The GRND-40A Series is a non-isolated step down DC/DC converter providing up to 45A of output current and
designed to be compatible with the Intel VRM11 requirements. Standard features include remote on/off, over
current protection, remote sense, VR_Fan signal, VR_Hot signal and a power good signal. This product also
makes use of adaptive positioning to improve transient response performance. These products may be used
almost anywhere low-voltage silicon is being employed and a nominal 12V source is available. Typical
applications include file servers, work stations and other computing applications.
Part Selection
Output
Voltage
0.82 – 1.60V
Input
Voltage
12V
Output Current
(Thermal Design)
35A
Output Current
(Peak Current)
45A
Typical
Efficiency
85%
Model Number
GRND-40A160
Input Specifications
Parameter
Input Voltage Range
Input Current (disabled)
Input Current (full load)
Reflected Ripple Current
Min
10.8 VDC
Typ
Max
13.2 VDC
Notes
17mA
8.0A
400mA rms
With 2 330uF, 25mOhm
capacitor and 200nH of input
inductance.
Output Specifications
Parameter
Output Current
Set Point Accuracy
Min
0A
Typ
1.27V
1.28V
Adaptive Positioning
(Droop Impedance)
Ripple and Noise
1.25 mOhm
Turn on Time
Transient Response
15mS
20mV
Deviation
Settling Time
Notes
Thermal design
Peak current rating
no load, excluding Adaptive
positioning, VRM11 VID 0x32
pk-pk, 0 to 20MHz Bandwidth
Full load. Note 3
30mS
di/dt = 5A/uS
Load step =50% of max load.
TBD
TBD
Remote Sense Compensation
Output Capacitance
Max
35A
45A
1.29V
±0.3VDC
See note
1,400uF
See note
Consult factory regarding
external capacitance outside
of this range
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
10.3 –13.2V Input / Programmable Output / 90A VRM11
General Specifications
Parameter
Switching Frequency
Dimensions
Pin Connections
Specification
TBD MHz typical (fixed)
inches
mm
Weight
Operating Temperature
Non-Operating Temperature
Protection Features
Over current
Undervoltage
Remote On/Off
Efficiency (full load)
1.3V output
35A load
3.8 x 1.055 x 0.393
96.5 x 26.8 x 9.98
TBD
0°C to 65°C
-40°C to 100°C
110% to 170% max Io
UVLO Vin < 10.0V
Active High
85%
Row A
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13-16
17-20
21-24
25-26
27-30
31-34
35-38
39-42
43-46
47-48
49-52
53-56
57-60
61-64
65-68
69-70
71-74
75-78
79-82
Function
PWRGD
Reserved
OUTEN
LL1
VID5
VID3
VID1
Reserved
+SENSE
Reserved
VR_HOT
IMON
Key
VIN
GND
VOUT
GND
VOUT
GND
VOUT
GND
VOUT
GND
VOUT
GND
VOUT
GND
VOUT
GND
VOUT
GND
VOUT
Row B
Pin
164
163
162
161
160
159
158
157
156
155
154
153
149-152
145-148
141-144
139-140
135-138
131-134
127-130
123-126
119-122
117-118
113-116
109-112
105-108
101-104
97-100
95-96
91-94
87-90
83-86
Function
VBIAS
Reserved
LL0
VID6
VID4
VID2
VID0
LPL
-SENSE
VIDSEL
VRM_PRES
Reserved
Key
VIN
GND
VOUT
GND
VOUT
GND
VOUT
GND
VOUT
GND
VOUT
GND
VOUT
GND
VOUT
GND
VOUT
GND
VOUT
Notes:
1. Mechanical key between pins 12 & 13 and 152 &
153
2. Recommended mating connector Molex iCool P/N
87787-1011.
3. Measured with 2 X 560u 7mOhm ESR Al Poly and
28 X 10u 10mOHm ESR ceramic capacitors on output.
4. Leave Reserved pins floating in end use application.
2007 Bel Fuse Inc. Specifications subject to change without notice. 082807
CORPORATE
FAR EAST
EUROPE
Bel Fuse Inc.
206 Van Vorst Street
Jersey City, NJ 07302
Tel 201-432-0463
Fax 201-432-9542
www.belfuse.com
Bel Fuse Ltd.
8F/ 8 Luk Hop Street
San Po Kong
Kowloon, Hong Kong
Tel 852-2328-5515
Fax 852-2352-3706
www.belfuse.com
Bel Fuse Europe Ltd.
Preston Technology Management Centre
Marsh Lane, Suite G7, Preston
Lancashire, PR1 8UD, U.K.
Tel 44-1772-556601
Fax 44-1772-888366
www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
12V Input / Programmable Output / VRM11 Compatible
Signal Definitions
Symbol
Definitions
VIN
Input power to the converter
GND
Common return for both input and output
VID0, VID1,
VID2, VID3,
VID4, VID5
VID6
Logic level inputs used to set the output voltage, refer to VID table. Connect VID0 thru
VID6 pins to open-drain outputs with external pull-up resistors. Valid logic low is -0.3V to
0.4V, valid logic high level is 0.8V to 5.5V.
VIDSEL
Digital input used to select between extended VR10 and VR11 VID tables.
+SENSE
-SENSE
The open drain power good signal indicates the output voltage is within 10% of the VID
setpoint.
Remote voltage sense lines. Connect these at the point of load, to VOUT and GND
respectively.
VOUT
Output voltage available to the load.
PWRGD
Logic level input used to enable the converter when high. Valid logic low is -0.3V to 0.4V,
valid logic high level is 0.8V to 5.5V.
Load line select pins. Working in conjunction with VID_Select, LL0/LL1 are used to select
load line slope. Currently only 1.25mohm slope is supported. Module can be configured
LL0/LL1
to support multiple load line slopes.
IMON
Analog average load current signal, scaling TBD.
VBIAS
3.3V Bias input. 3.1 – 3.5V, 200mA max, required for operation of unit.
Open-drain output signal, pulled actively low indicating a thermal event has been
VR_HOT
detected on the VRM
VRM_PRES Signal used by system to indicate the VRM is present in the design.
Low Power Lockout. This signal has a 10k pull-down resistor internal to the VRM. The
application board ties this signal to OUTEN, so the VRM will turn on only when plugged
LPL
into a socket with this configuration. LPL and OUTEN are AND’ed in the VRM, both must
be logic high in order for the VRM output to be enabled.
OUTEN
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
10.3 –13.2V Input / Programmable Output / 90A VRM11
VRM11.0 VID
Codes
HEX
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
Vo
(VDC)
Off
Off
1.60000
1.59375
1.58750
1.58125
1.57500
1.56875
1.56250
1.55625
1.55000
1.54375
1.53750
1.53125
1.52500
1.51875
1.51875
1.51250
1.50625
1.50000
1.49375
1.48750
1.48125
1.47500
1.46875
1.46250
1.45625
1.45000
1.44375
1.43750
1.43125
1.42500
1.41875
1.41250
1.40625
1.40000
1.39375
1.38750
1.38125
1.37500
1.36875
1.36250
1.35625
1.35000
1.34375
1.33750
1.33125
1.32500
HEX
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
Vo
(VDC)
1.31250
1.30625
1.30000
1.29375
1.28750
1.28125
1.27500
1.26875
1.26250
1.25625
1.25000
1.24375
1.23750
1.23125
1.22500
1.21875
1.21250
1.20625
1.20000
1.19375
1.18750
1.18125
1.17500
1.16875
1.16250
1.15625
1.15000
1.14375
1.13750
1.13125
1.12500
1.11875
1.11250
1.10625
1.10000
1.09375
1.08750
1.08125
1.07500
1.06875
1.06250
1.05625
1.05000
1.04375
1.03750
1.03125
1.02500
1.01875
HEX
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
Vo
(VDC)
1.01250
1.00625
1.00000
0.99375
0.98750
0.98125
0.97500
0.96875
0.96250
0.95625
0.95000
0.94375
0.93750
0.93125
0.92500
0.91875
0.91250
0.90625
0.90000
0.89375
0.88750
0.88125
0.87500
0.86875
0.86250
0.85625
0.85000
0.84375
0.83750
0.83125
0.82500
0.81875
Note: VIDs with VID7=1 not
shown because this VRM
does not have a VID7 pin.
2007 Bel Fuse Inc. Specifications subject to change without notice. 082807
CORPORATE
FAR EAST
EUROPE
Bel Fuse Inc.
206 Van Vorst Street
Jersey City, NJ 07302
Tel 201-432-0463
Fax 201-432-9542
www.belfuse.com
Bel Fuse Ltd.
8F/ 8 Luk Hop Street
San Po Kong
Kowloon, Hong Kong
Tel 852-2328-5515
Fax 852-2352-3706
www.belfuse.com
Bel Fuse Europe Ltd.
Preston Technology Management Centre
Marsh Lane, Suite G7, Preston
Lancashire, PR1 8UD, U.K.
Tel 44-1772-556601
Fax 44-1772-888366
www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
12V Input / Programmable Output / VRM11 Compatible
Mechanical Outline Drawing
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com