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
3 - 15V Input / Programmable Output / 30A VRM 8.5 Compatible
High efficiency means less power dissipation
Remote
on/off
Ultrawide input range (3V - 15V)
Very wide trim range (-100%, +200%)
2-Wire
Remote
sense
5 bit VID digital voltage programming.
Single wire current sharing
Description
The G7NA-30D Series is a non-isolated step down DC/DC converters providing up to 30A of output current and
designed to be compatible to the Intel VRM8.5 specification. Standard features include current share, remote
on/off, over current protection, remote sense and a power good signal. Optional features include adjustable
undervoltage lockout, output current monitor and output trim. 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, 5V or 3.3V source is available. Typical applications
include file servers, routers, and other computing and communications equipment.
Input Specifications
Parameter
Min
Typ
Max
Notes
Input Voltage Range
3 VDC
15 VDC
Input Current (disabled)
17mA
Input Current (full load)
22A
Reflected Ripple Current
200mA rms
With 100uF, 25mOhm
capacitor and 200nH of input
inductance.
Output Specifications
Parameter
Min
Typ
Max
Notes
Voltage Adjustability
-100%
+200%
Output Current
0A
30A
Set Point Accuracy
1.85V
1.87
1.89
no load, excluding Adaptive
positioning
Adaptive Positioning
(Droop Impedance)
3.214
mOhm
Ripple and Noise
20mV
pk-pk, 0 to 20MHz Bandwidth
Full load with external
1800uF oscon capacitor on
output.
Turn on Time
6mS
10mS
Transient Response
Deviation
Settling Time
85mV
35uS
di/dt = 5A/uS
Load step =50% of max load.
Remote Sense Compensation
0.3VDC
Output Capacitance
1800uF
20,000uF
For applications requiring
higher or lower output
capacitance please consult
factory.
G7NA-30D180
2003 Bel Fuse Inc. Specifications subject to change without notice. 081903
CORPORATE FAR
EAST
EUROPE
Bel Fuse Inc.
Bel Fuse Ltd.
Bel Fuse Europe Ltd.
206 Van Vorst Street
8F/ 8 Luk Hop Street
Preston Technology Management Centre
Jersey City, NJ 07302
San Po Kong
Marsh Lane, Suite G7, Preston
Tel 201-432-0463
Kowloon, Hong Kong
Lancashire, PR1 8UD, U.K.
Fax 201-432-9542
Tel 852-2328-5515
Tel 44-1772-556601
www.belfuse.com
Fax 852-2352-3706
Fax 44-1772-888366
www.belfuse.com
www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
3 15V Input / Programmable Output / 30A VRM 8.5
General Specifications
Parameter
Specification
Switching Frequency
540kHz typical (fixed)
Dimensions
inches
mm
2.75 x 1.5 x 0.48
69.8 x 38.1 x 27.9
Weight TBD
Operating Temperature
0
C to 70C
Non-Operating Temperature
-40
C to 100C
Protection Features
Over current
Undervoltage
115% to 200% max Io
UVLO Vin < 9.5V
Remote On/Off
Active High
Efficiency (full load)
1.8V output
82%
Pin Connections
Row A
Row B
Pin
Function
Pin
Function
1 Vin 50
Vin
2 Vin 49
Vin
3 Vin 48
Vin
4 Vin 47
Vin
5 Reserved 46
Reserved
6 Reserved 45
Reserved
7 Trim 44
No
contact
8
VID 0
43
VID 1
9
VID 2
42
VID 3
10 VID
25mV 41 PWRGD
11 OUTEN 40 Ishare
12 Vtt_pwrgd 39 Vtt
13 -Vsense 38 RTN
14 +Vsense 37 RTN
15 Vout 36
Vout
16 RTN 35
RTN
17 Vout 34
Vout
18 RTN 33
RTN
19 Vout 32
Vout
20 RTN 31
RTN
21 Vout 30
Vout
22 RTN 29
RTN
23 Vout 28
Vout
24 RTN 27
RTN
25 Vout 26
Vout
Notes:
1. Mechanical key between pins 17 & 18 and
33 & 34
2.
If Vtt circuitry is not used, tie Vtt (pin 39) to
a voltage of 1.5V or greater.
3. Use mating connector Tyco AMP 145432-
2 or equivalent
Voltage Identification (VID) Code
VID25mV
VID3
VID2
VID1
VID0
Vo (VDC)
0 0 1
0
0
1.05
1 0 1
0
0
1.075
0 0 0
1
1
1.1
1 0 0
1
1
1.125
0 0 0
1
0
1.15
1 0 0
1
0
1.175
0 0 0
0
1
1.2
1 0 0
0
1
1.225
0 0 0
0
0
1.25
1 0 0
0
0
1.275
0 1 1
1
1
1.3
1 1 1
1
1
1.325
0 1 1
1
0
1.35
1 1 1
1
0
1.375
0 1 1
0
1
1.4
1 1 1
0
1
1.425
0 1 1
0
0
1.45
1 1 1
0
0
1.475
0 1 0
1
1
1.5
1 1 0
1
1
1.525
0 1 0
1
0
1.55
1 1 0
1
0
1.575
0 1 0
0
1
1.6
1 1 0
0
1
1.625
0 1 0
0
0
1.65
1 1 0
0
0
1.675
0 0 1
1
1
1.7
1 0 1
1
1
1.725
0 0 1
1
0
1.75
1 0 1
1
0
1.775
0 0 1
0
1
1.8
1 0 1
0
1
1.825
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