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 CONVERTER
5V Input
Vref/2 / 5A Output
Non-Isolated
Remote
On/Off
Fixed
frequency
(300kHz)
OCP/SCP
Under-voltage
lockout
(UVLO)
Low Profile Package (7.82mm)
Description
The Bel x7AH-05BT50 is part of the low cost non-isolated DC/DC converter series. The converter is designed
specifically to provide bus termination voltage in application such as DDR (double data rate) memory where the
bus termination voltage must closely track the I/O bus voltage. The converter accepts a reference input and
programs its output voltage to 50% of the reference. The modules use a SMD or vertical mount package for
ease of layout and space savings.
Part Selection
Output
Voltage
Input
Voltage
Max. Output
Current
Max. Output
Power
Typical
Efficiency
Part Number
Surface Mount
Part Number
Vertical Mount
Vref/2
5V
5A
6.25W
82%
S7AH-05BT50
V7AH-05BT50
Note: Add "0" suffix at the end of the model number to indicate "Tube Packaging", and "R" for "Reel
Packaging", and "G" for "Tray Packaging".
Absolute Maximum Ratings
Parameter
Min
Typ
Max
Notes
Input Voltage (continuous)
-0.3V
-
6V
Output Enable Terminal Voltage
-0.3V
-
6V
Ambient Temperature
-40
C
-
85
C
Storage Temperature
-55
C
-
125
C
Input Specifications
Parameter
Min
Typ
Max
Notes
Input Voltage
4.5V
5.0V
5.5V
Input Current
-
-
2A
Input Current (No load)
-
-
60mA
Remote Off Input Current
-
9mA
15mA
Input Reflected Ripple Current
(RMS)
- 30mA
50mA
Input Reflected Ripple Current
(pk-pk)
- 110mA
140mA
Measured with simulated source
impedance of 500nH, 5Hz to 20MHz;
& one 270uF/16V capacitor with ESR =
0.018 ohm max. at 100KHz
I
2
t Inrush Current Transient
-
0.02A
2
s 0.05A
2
s
Turn-on Voltage Threshold
4.19V
4.3V
4.5V
Turn Off Voltage threshold
-
3.8V
4.49V
Notes: 1. All tests are measured at Vref = 2.5V.
2. All specifications are typical at 25
C unless otherwise stated.
x7AH-05BT50
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 CONVERTER
5V Input
Vref/2 / 5A Output
Output Specifications
Parameter
Min
Typ
Max
Notes
Output Voltage Set Point
0.99* (Vref/2) V
Vref/2
1.01* (Vref/2) V
Vin=5V, Iout=full load.
Load Regulation
-
3mV
6mV
Line Regulation
-
1mV
3mV
Regulation Over Temperature
(-40
C to +85
C)
- 15mV
20mV
Output Current
0A - 5A
Output Current Threshold
6.5A
-
12.5A
Short Circuit Surge Transient
-
0.04A
2
s 0.08A
2
s
Ripple and Noise (RMS)
-
12mV
20mV
Ripple and Noise (pk-pk)
-
45mV
90mV
Tested at:
0-20MHz BW;
with 1uF ceramic
capacitor at the output
Turn On Time
-
12mS
20mS
Overshoot at Turn on
-
0%
5%
Output Capacitance
-
-
2200uF
Notes: 1. All specifications are typical at nominal input, full load at 25
C unless otherwise stated.
2. The modules track the transient response of the reference input. See the figure in TR data on Page 3.
3. The turn-off undershoot of the module is below 100mV if a 220uF aluminum cap is added at the output.
4. All tests are measured at Vref=2.5V.
General Specifications
Parameter
Min
Typ
Max
Notes
Efficiency
79%
82%
-
Measured at Vin=5V, full load
Switching Frequency
250KHz
300KHz
340KHz
MTBF
8,841,119 hours
Calculated Per Bell Core TR-332 (I
O
=4A, Vin=5V, Vref=2.5V; T
a
= 25
C)
Dimensions (surface mount)
Inches (L
W
H)
Millimeters (L
W
H)
0.78 x 0.7 x 0.32
19.812 x 17.78 x 8.128
Dimensions (vertical)
Inches (L
W
H)
Millimeters (L
W
H)
0.7 x 0.308 x 0.65
17.78 x 7.82 x 16.51
Weight -
4.7g
-
Note: All specifications are typical at nominal input, full load at 25
C unless otherwise stated. All tests are
measured at Vref=2.5V
Control Specifications
Parameter
Min
Typ
Max
Notes
Remote On/Off
-0.3V -
1.35V
(Vin=4.5V)
Signal Low (Unit Off)
-0.3V -
1.65V
(Vin=5.5V)
3.15 V(Vin=4.5V)
-
5.5V
Signal High (Unit On)
3.85 V(Vin=5.5V)
-
5.5V
Remote on/off pin open, unit on
Note: All tests are measured at Vref=2.5V.
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 CONVERTER
5V Input
Vref/2 / 5A Output
Transient Response: track the transient response of the reference input. No External Load Capacitance.
Channel 1: Transient response
tracking.
Channel 2: Transient response
of the reference input.
Ta = 25
C
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 CONVERTER
5V Input
Vref/2 / 5A Output
Efficiency Data
79.0%
80.0%
81.0%
82.0%
83.0%
84.0%
85.0%
86.0%
87.0%
1
2
3
4
5
4.5V
5.0V
5.5V
Efficiency is tested at Vref=2.5V.
Thermal Derating Curves
V7AH-05BT50 S7AH-05BT50
Test Condition: Derating curves are tested at nominal input voltage and Vref=2.5V.
2003 Bel Fuse Inc. Specifications subject to change without notice. 112504
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 CONVERTER
5V Input
Vref/2 / 5A Output
S7AH-05BT50
V7AH-05BT50
Pin Connections
Pin
Function
1 Remote
On/Off
(option)
2 Vin
3 Ground
4 Vout
5 Vref
6 N/A
7 N/A
Pin Connections
Pin
Function
1
Remote On/Off (option)
2 Vin
3 Ground
4 Vout
5 Vref
b e l
b e l
b e l
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