BEL X7AH

NON-ISOLATED DC/DC CONVERTER
5V Input
Vref/2 / 5A Output
x7AH-05BT50
•
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
Vref/2
Input
Voltage
5V
Max. Output
Current
5A
Max. Output
Power
6.25W
Typical
Efficiency
82%
Part Number
Surface Mount
S7AH-05BT50
Part Number
Vertical Mount
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
Input Voltage (continuous)
Min
-0.3V
Typ
-
Max
6V
Notes
Output Enable Terminal Voltage
-0.3V
-
6V
Ambient Temperature
-40°C
-
85°C
Storage Temperature
-55°C
-
125°C
Input Specifications
Parameter
Input Voltage
Min
4.5V
Typ
5.0V
Max
5.5V
Input Current
-
-
2A
Input Current (No load)
-
-
60mA
Remote Off Input Current
Input Reflected Ripple Current
(RMS)
Input Reflected Ripple Current
(pk-pk)
-
9mA
15mA
-
30mA
50mA
-
110mA
140mA
2
2
0.02A s
Notes
Measured with simulated source
impedance of 500nH, 5Hz to 20MHz;
& one 270uF/16V capacitor with ESR =
0.018 ohm max. at 100KHz
2
I t Inrush Current Transient
-
0.05A 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.
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
0.99* (Vref/2) V
Vref/2
1.01* (Vref/2) V
Load Regulation
Line Regulation
-
3mV
1mV
6mV
3mV
Regulation Over Temperature
(-40°C to +85°C)
-
15mV
20mV
Output Current
Output Current Threshold
Short Circuit Surge Transient
0A
6.5A
-
2
0.04A s
5A
12.5A
2
0.08A s
Ripple and Noise (RMS)
-
12mV
20mV
Ripple and Noise (pk-pk)
-
45mV
90mV
Turn On Time
Overshoot at Turn on
Output Capacitance
-
12mS
0%
-
20mS
5%
2200uF
Output Voltage Set Point
Notes
Vin=5V, Iout=full load.
Tested at: 0-20MHz BW;
with 1uF ceramic
capacitor at the output
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
Efficiency
Switching Frequency
Typ
Max
79%
82%
-
250KHz
300KHz
340KHz
MTBF
× H)
× H)
0.78 x 0.7 x 0.32
19.812 x 17.78 x 8.128
× H)
× H)
0.7 x 0.308 x 0.65
17.78 x 7.82 x 16.51
4.7g
-
Measured at Vin=5V, full load
Calculated Per Bell Core TR-332 (IO
=4A, Vin=5V, Vref=2.5V; Ta = 25°C)
8,841,119 hours
Dimensions (surface mount)
Inches (L × W
Millimeters (L × W
Dimensions (vertical)
Inches (L × W
Millimeters (L × W
Weight
Notes
-
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
-0.3V
-
1.35V (Vin=4.5V)
Notes
Remote On/Off
Signal Low (Unit Off)
Signal High (Unit On)
-0.3V
-
1.65V (Vin=5.5V)
3.15 V(Vin=4.5V)
-
5.5V
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
87.0%
86.0%
85.0%
84.0%
4.5V
5.0V
5.5V
83.0%
82.0%
81.0%
80.0%
79.0%
1
2
3
4
5
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.
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
S7AH-05BT50
bel
Pin Connections
Pin
Function
1
Remote On/Off (option)
2
Vin
3
Ground
4
Vout
5
Vref
6
N/A
7
N/A
V7AH-05BT50
bel
bel
Pin Connections
Pin
Function
1
Remote On/Off (option)
2
Vin
3
Ground
4
Vout
5
Vref
2003 Bel Fuse Inc. Specifications subject to change without notice. 112504
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