GS-R12HXXX2
2.5W TO 24W STEP-DOWN SWITCHING REGULATOR FAMILY
PRELIMINARY
FEATURE
s
s
s
s
s
s
s
s
s
s
s
MTBF 1 000 000 hours (T
amb
=25
)
C)
2A max output current
35V max input voltage
1.5V max drop-out voltage
3.3V ± 2% reference voltage
Remote logic inhibit/enable
Synchronization
Not-latching overload and short circuit
protection
Thermal shutdown
Fixed or adjustable output
No heatsink required
ORDERING NUMBER: GS-R12HXXX2
DESCRIPTION
The GS-R12HXXX2 series is a family of high efficiency step down switching voltage regulator, designed to re-
place linear regulators.
Based on STM L5973 device, this non isolated family of regulators are suitable for the full spectrum of applica-
tions including telecom, industry, computer and distributed power system applications having a widely ranging
input voltage.
SELECTION CHART
Type
Ordering
Number
GS-R12H0122
GS-R12H0182
GS-R12H0252
GS-R12H0332
GS-R12H0502
GS-R12H0002
GS-R24H0332
Output
Voltage
[V]
1.235
±
3
%
1.8
±
4
%
2.5
±
4
%
3.3
±
4
%
5.0
±
4
%
1.235
÷
5.0
3.3
±
4
%
Input
Voltage
[V]
4.5
÷
15
4.5
÷
15
4.5
÷
15
4.5
÷
15
6.6
÷
15
4.5
÷
15
16
÷
35
Output
Ripple
[mVpp]
20
20
20
20
20
20
20
Efficiency
[%]
68
72
76
82
85
68
÷
85
82
Notes
Fixed output voltage
Fixed output voltage
Fixed output voltage
Fixed output voltage
Fixed output voltage
Progr. output voltage
Fixed output voltage
October 2003
This is preliminary information on a new product now in development. Details are subject to change without notice.
1/8
GS-R12HXXX2
Type
Ordering
Number
GS-R24H0502
GS-R24H1201.5
GS-R24H0001
Output
Voltage
[V]
5.0
±
4
%
12
±
4
%
3.3
÷
24
Input
Voltage
[V]
16
÷
35
16
÷
35
16
÷
35
Output
Ripple
[mVpp]
20
100
100
÷
250
Efficiency
[%]
85
91
78
÷
96
Notes
Fixed output voltage
Fixed output voltage
Progr. output voltage
ABSOLUTE MAXIMUM RATINGS
Symbol
Vi
DC Input Voltage (for GS-R24HXXX)
I
out
V
9
V
10
V
11
T
stg
T
op
T
op1
Maximum Output Current
INH
Sync
FB
Storage Temperature Range
Operating Ambient Temperature
Operating Ambient Temperature with current derating
36
int. limit
-0.3 to V
i
-0.3 to 4
4
-40
÷
105
-25
÷
70
-25
÷
85
V
V
V
°C
°C
°C
V
Parameter
DC Input Voltage (for GS-R12HXXX2)
Value
16
Unit
V
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GS-R12HXXX2
CONNECTION DIAGRAM AND MECHANICAL DATA
PIN DESCRIPTION
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
Function
Input GND
Input GND
Input GND
Input +
Input +
Input +
Input +
V
ref
INH
Sync
FB
V
out
V
out
Return for input voltage source
Return for input voltage source
Return for input voltage source
DC input voltage
DC input voltage
DC input voltage
DC input voltage
3.3V reference voltage
A logical level (active high) disables the device, when it is open an internal pull
up disables the device
Master/Slave synchronization
Feedback input, available on adjustable device
Regulated output
Regulated output
Description
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GS-R12HXXX2
Pin
14
15
16
17
18
Function
V
out
V
out
Output GND
Output GND
Output GND
Regulated output
Regulated output
Return for output voltage
Return for output voltage
Return for output voltage
Description
ELECTRICAL CHARACTERISTICS All versions
(T
amb
=25
)
C, unless otherwise specified.)
Symbol
Parameter
Temperature Stability
I
oL
I
q
I
qst-by
f
s
V
ref
Short Circuit Current
INH
INH Threshold Voltage
Device ON
Device OFF
V
FB
SRV
R
th
Feedback voltage
Supply Voltage Rejection
Thermal Resistance
Case to ambient
V
i
=4.5
÷
15V I
o
= 0
÷
2A
2.2
1.22
1.235
1.25
Current Limit
Quiescent Current
Total Stand-by Quiescent
Current
Switching Frequency
Reference Voltage
Test Condition
V
i
=V
o
+ 1.5V I
o
= 2A
V
i
=4.5
÷
15V
V
i
=12V I
o
= 0A
V
inh
>2.2V
V
i
=12V I
o
= 1.5A
V
i
=4.5
÷
15V I
ref
=0
÷
5mA
225
3.234
8
2.5
1.8
50
250
3.3
10
2.5
100
275
3.366
30
0.8
Min.
Typ.
Max.
Unit
mV/°C
A
mA
µ
A
kHz
V
mA
V
V
V
mV/V
°C/W
ELECTRICAL CHARACTERISTICS for GS-R12HXXX2 only
(T
amb
=25
)
C, unless otherwise specified.)
Symbol
I
o
V
r
Parameter
Output Current
Ripple Voltage
Test Condition
V
i
=4.5
÷
15V
V
i
=12V I
o
= 2A
Min.
0
20
Typ.
Max.
2
Unit
A
mVpp
4/8
GS-R12HXXX2
ELECTRICAL CHARACTERISTICS for GS-R24HXXX only
(T
amb
=25
)
C, unless otherwise specified.)
Symbol
I
o
I
o
I
o
V
r
V
r
V
r
Parameter
Output Current
Test Condition
V
i
=16
÷
35V for GS-R24H0332
---------------------GS-R24H0502
V
i
=16
÷
35V for GS-R24H1201.5
V
i
=16
÷
35V for GS-RH0001
V
i
=24V I
o
= 2A for GS-R24H0332
--------------------- -GS-R24H0502
V
i
=24V I
o
= 2A for GS-R24H1201.5
V
i
=24V I
o
= 2A for GS-R24H0001
Min.
0
Typ.
Max.
2
Unit
A
Output Current
Output Current
Ripple Voltage
Ripple Voltage
Ripple Voltage
0
0
20
100
100-
250
1.5
1-2
A
A
mVpp
mVpp
mVpp
USER NOTES
Input Voltage
The recommended operating maximum DC Input Voltage is 15V inclusive of ripple voltage.
Reference voltage
No capacitor is required for stability.
Inhibit function
The inhibit feature allows to put in stand-by mode the device.
With INH pin 9 higher than 2.2V the device is disabled and the power consumption is reduced to less than
100µA.
With INH pin lower than 0.8V, the device is enabled.
If the INH pin is left floating, an internal pull up ensures that the voltage at the pin reaches the inhibit threshold
and the device is disabled.
The pin is also V
cc
compatible.
Multiple units synchronization
Using more than one unit on the same circuit, it is possible to synchronize the switching frequency, connecting
all pin 10 together (see figure 3).
The unit with higher frequency becomes the master.
Current protection
The device has two current limit protections, pulse by pulse and frequency fold back.
The current is sensed through a resistor and if reaches the threshold, the on time is reduced and consequently
the output voltage too.
Since the minimum switch ON time (necessary to avoid false overcurrent signal) is not enough to obtain a suf-
ficiently low duty cycle at 250 Hz, the output current, in strong overcurrent or short circuit conditions, could in-
crease again.
For this reason the switching frequency is also reduced, so keeping the inductor current under its maximum
threshold.
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