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
4.5 V-32 V Input
1.2 V-3.3 V/1 A Output
Non-Isolated
output
Remote
On/Off
Trim
function
OCP/SCP
Low profile package (7.82 mm)
Under-voltage
lockout
(UVLO)
Description
The Bel xRAH-01H1A0 is part of the low cost non-isolated dc/dc converter series. The modules use a SMD or
vertical mount package for ease of layout and space savings. The output is widely trimmed from 1.2 V to 3.3 V.
Typical features include remote on/off, input under voltage lockout, over current protection and short circuit
protection.
Part Selection
Output
Voltage
Input
Voltage
Max. Output
Current
Max. Output
Power
Typical
Efficiency
Part Number
Surface Mount
Part Number
Vertical Mount
1.2 V - 3.3 V 4.5 V - 32 V
1 A
3.3 W
86%
SRAH-01H1A0
VRAH-01H1A0
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)
-0.3 V
-
34 V
Output Enable Terminal Voltage
-0.3 V
-
12 V
Ambient Temperature
-40
C
-
85
C
Storage Temperature
-40
C
-
125
C
Input Specifications
Parameter
Min
Typ
Max
Notes
Input Voltage
4.5 V
20 V
32 V
Input Current (no load)
-
5 mA
8 mA
Input Current (full load)
V
O
=3.3 V
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
-
-
-
-
-
-
-
-
-
-
0.20 A
0.16 A
0.12 A
0.11 A
0.09 A
Remote Off Input Current
-
2 mA
5 mA
Input Reflected Ripple Current
(pk-pk)
-
300 mA
420 mA
Input Reflected Ripple Current
(RMS)
-
100 mA
160 mA
Tested with simulated source impedance of 500
nH, 5 Hz to 20 MHz and one 100 F/50 V electrolytic
capacitor and a 3.3 uF/50 V ceramic capacitor at
the input
I
2
t Inrush Current Transient
-
0.02 A
2
s
0.1 A
2
s
Turn on Voltage Threshold
-
4.1 V
4.5 V
Turn off Voltage Threshold
-
3.3 V
4.0 V
Note:
All specifications are typical at 25
C unless otherwise stated
.
xRAH-01H1A0 RoHS Compliant
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
4.5 V-32 V Input
1.2 V-3.3 V/1 A Output
Output Specifications
Parameter
Min
Typ
Max
Notes
Output Voltage Set Point
V
O
=3.3 V
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
3.234 V
2.450 V
1.764 V
1.470 V
1.176 V
3.3 V
2.5 V
1.8 V
1.5 V
1.2 V
3.366 V
2.550 V
1.836 V
1.530 V
1.224 V
Test conditions:
Vin=20 V, Io=50% full
load
Line Regulation
V
O
=3.3 V
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
-
-
-
-
-
3 mV
2 mV
2 mV
1 mV
1 mV
6 mV
5 mV
4 mV
3 mV
2 mV
Load Regulation
V
O
=3.3 V
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
-
-
-
-
-
3 mV
2 mV
2 mV
1 mV
1 mV
6 mV
5 mV
4 mV
3 mV
2 mV
Regulation Over Temperature
(-40
C to +85 C)
-
10 mV
20 mV
Output Current
0 A
-
1 A
Current Limit Threshold
2 A
-
3 A
Short Circuit Surge Transient
-
0.02 A
2
s 0.1
A
2
s
Ripple and Noise (rms)
-
6 mV
10 mV
Ripple and Noise (pk-pk)
-
60 mV
100 mV
Test condition: 0-20 MHz
BW
Turn on Time
-
6 mS
30 mS
Overshoot at Turn on
-
2%
5%
Output Capacitance
0 uF
-
400uF
Transient Response
Overshoot
-
80 mV
120 mV
50% ~ 100%
Max Load
Settling Time
-
150 uS
200 uS
Overshoot
-
80 mV
120 mV
100% ~ 50%
Max Load
Settling Time
V
O
=3.3 V
-
150 uS
200 uS
Overshoot
-
70 mV
110 mV
50% ~ 100%
Max Load
Settling Time
-
120 uS
160 uS
Overshoot
-
70 mV
110 mV
100% ~ 50%
Max Load
Settling Time
V
O
=2.5 V
-
120 uS
160 uS
Overshoot
-
60 mV
100 mV
50% ~ 100%
Max Load
Settling Time
-
100 uS
130 uS
Overshoot
-
60 mV
100 mV
100% ~ 50%
Max Load
Settling Time
V
O
=1.8 V
-
100 uS
130 uS
Overshoot
-
60 mV
100 mV
50% ~ 100%
Max Load
Settling Time
-
100 uS
130 uS
Overshoot
-
60 mV
100 mV
100% ~ 50%
Max Load
Settling Time
V
O
=1.5 V
-
100 uS
130 uS
Overshoot
-
60 mV
100 mV
50% ~ 100%
Max Load
Settling Time
-
100 uS
130 uS
Overshoot
-
60 mV
100 mV
100% ~ 50%
Max Load
Settling Time
V
O
=1.2 V
-
100 uS
130 uS
Test conditions:
di/dt = 0.5 A/uS;
Vin = 20 V
Note:
All specifications are typical at 20 V input, full load 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
4.5 V-32 V Input
1.2 V-3.3 V/1 A Output
General Specifications
Parameter
Min
Typ
Max
Notes
Efficiency
V
O
=3.3 V
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
83%
80%
76%
73%
70%
86%
83%
79%
76%
73%
-
-
-
-
-
Measured at Vin=20 V, full load.
Switching Frequency
V
O
=3.3 V
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
270 kHz
190 kHz
150 kHz
130 kHz
100 kHz
290 kHz
220 kHz
170 kHz
150 kHz
120 kHz
310 kHz
250 kHz
190 kHz
170 kHz
140 kHz
Output Trim Range
1.2 V
-
3.3 V
Vo=1.2 V when trim pin open.
MTBF
8,040,762 hours
Calculated Per Bell Core SR-332 (I
O
=0.8 A, Vin=20 V; T
a
= 25
C)
Dimensions (surface mount)
Inches (L W H)
Millimeters (L W H)
0.78 x 0.70 x 0.32
19.81 x 17.78 x 8.13
Dimensions (vertical)
Inches (L W H)
Millimeters (L W H)
0.70 x 0.308 x 0.65
17.78 x 7.82 x 16.51
Weight -
5.1
g
-
Note:
All specifications are typical at 20V input, full load at 25
C
unless otherwise stated.
Control Specifications
Parameter
Min
Typ
Max
Notes
Remote On/Off
Signal Low (Unit On)
-0.3 V
-
1 V
Signal High (Unit Off)
2.8 V
-
12 V
Remote on/off pin open, unit on.
Output Trim Equations
Equations for calculating the trim resistor (in k) given the desired adjusted voltage (Vadj) and the nominal
output voltage of the converter (Vo) are shown below. The Trim Down resistor should be connected between the
Trim pin and Vout. The Trim Up resistor should be connected between the Trim pin and Ground. Only one of the
resistors should be used for any given application.
5
.
21
7
.
8
-
-
=
adj
o
TrimDown
V
V
R
o
adj
TrimUp
V
V
R
-
=
2
.
17
Note:
Output voltage Vo=1.205 V
Module
Vout
Trim
GND
Rtrimdown
Module
Vout
Trim
GND
Rtrimup
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
4.5 V-32 V Input
1.2 V-3.3 V/1 A Output
Efficiency Data
Efficiency Curve
50.0%
55.0%
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Output Current (A)
E
f
f
i
ci
en
cy
4.5 V
20 V
32 V
Efficiency Curve
50.0%
55.0%
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Output Current (A)
E
f
f
i
ci
en
c
y
4.5 V
20 V
32 V
Vo = 3.3 V Vo = 2.5 V
Efficiency Curve
50.0%
55.0%
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Output Current (A)
E
f
f
i
ci
en
cy
4.5 V
20 V
32 V
Efficiency Curve
50.0%
55.0%
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Output Current (A)
E
f
f
i
c
i
en
cy
4.5 V
20 V
32 V
Vo = 1.8 V Vo = 1.5 V
Efficiency Curve
50.0%
55.0%
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Output Current (A)
Eff
ic
ie
n
c
y
4.5 V
20 V
32 V
Vo = 1.2 V
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
4.5 V-32 V Input
1.2 V-3.3 V/1 A Output
Thermal Derating Curve
Test Condition
: Derating curve is tested at nominal input voltage.
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