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
12 Vdc Input 0.9 Vdc - 5.0 Vdc/20 A Output
Input Specifications (continued)
Parameter Min Typ Max Notes
Input Reflected Ripple Current (pk-pk)
Vo=5.0 V
Vo=3.3 V
Vo=2.5 V
Vo=0.9 V
-
-
-
280 mA
250 mA
200 mA
150 mA
350 mA
320 mA
280 mA
250 mA
Input Reflected Ripple Current (rms)
Vo=5.0 V
Vo=3.3 V
Vo=2.5 V
Vo=0.9 V
-
-
-
80 mA
70 mA
45 mA
40 mA
120 mA
100 mA
80 mA
60 mA
Tested with simulated source
impedance of 1.5 uH 5Hz to 20 MHz,
and 2 × 270 uF/16 V Oscon
capacitors (ESR ≤ 20 mΩ) at the
input
External Input Capacitance - 540 uF -
Turn-on Voltage Threshold 8.5 V 9.0 V 9.5 V
Turn-off Voltage Threshold 7.0 V 7.6 V 8.3 V
Note: All specifications are typical at 25 °C unless otherwise stated.
Output Specifications
Parameter Min Typ Max Notes
Output Voltage Set Point -2.5%Vo,set - 2.5%Vo,set Vin=12 V, lo=lomax, full load
Output Voltage Set Point -3.5%Vo,set - 3.5%Vo,set
Over all operating input voltage, resistive
load, and temperature conditions
Load Regulation
Vo=5.0 V
Vo=3.3 V
Vo=2.5 V
Vo=0.9 V
-
-
-
-
-
-
-
-
0.4%Vo,set
0.4%Vo,set
0.5%Vo,set
1%Vo,set
Io=Iomin to Iomax
Line Regulation - - 0.5%Vo,set Vin=Vinmin to Vinmax
Output Ripple and Noise (pk-pk)
Vo=5.0 V
Vo=3.3 V
Vo=2.5 V
Vo=0.9 V
-
-
-
-
65 mV
60 mV
55 mV
45 mV
80 mV
75 mV
70 mV
55 mV
Tested at 0-20 MHz BW, with a
680 uF/6.3 V Oscon capacitor (ESR ≤ 12
mΩ), 10uF/16V Tantalum capacitor, and
10nF ceramic capacitor at the output.
Output Ripple and Noise (rms)
Vo=5.0 V
Vo=3.3 V
Vo=2.5 V
Vo=0.9 V
-
-
-
-
18 mV
15 mV
15 mV
10 mV
25 mV
25 mV
20 mV
15 mV
Output Current 0 A - 20 A
Current Limit Threshold 25 A - 40 A
Short Circuit Surge Transient - - 0.1 A
2
s
Turn on Time - 5 mS 10 mS
Overshoot at Turn on - 0%Vo 3%Vo
Output Capacitance
Vo=5.0 V
Vo=2.5 V
Vo=0.9 V
680 uF
680 uF
680 uF
-
-
-
5080 uF
7840 uF
11000 uF
Transient Response
50% ~ 75% Max Load
-
100 mV 150 mV
Settling Time
-
40 uS 80 uS
75% ~ 50% Max Load
-
100 mV 150 mV
Settling Time
V
O=0.9 V-
5.0 V
-
40 uS
80 uS
di/dt=2.5 A/uS; Vin=12 V; with a 680 uF/6.3
V Oscon capacitor (ESR ≤ 12 mΩ),
10 uF/16 V Tantalum capacitor and 10 nF
ceramic capacitor at the output.
Note: All specifications are typical at nominal input, full load at 25 °C unless otherwise stated.