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L4960

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
®
L4960
2.5A POWER SWITCHING REGULATOR
2.5A OUTPUT CURRENT
5.1V TO 40V OPUTPUT VOLTAGE RANGE
PRECISE (
±
2%) ON-CHIP REFERENCE
HIGH SWITCHING FREQUENCY
VERY HIGH EFFICIENCY (UP TO 90%)
VERY FEW EXTERNAL COMPONENTS
SOFT START
INTERNAL LIMITING CURRENT
THERMAL SHUTDOWN
DESCRIPTION
The L4960 is a monolithic power switching regula-
tor delivering 2.5A at a voltage variable from 5V to
40V in step down configuration.
Features of the device include current limiting, soft
start, thermal protection and 0 to 100% duty cycle
for continuous operation mode.
June 2000
ORDERING NUMBERS
: L4960 (Vertical)
L4960H (Horizontal)
HEPTAWATT
BLOCK DIAGRAM
The L4960 is mounted in a Heptawatt plastic power
package and requires very few external compo-
nents.
Efficient operation at switching frequencies up to
150KHz allows a reduction in the size and cost of
external filter components.
1/16
PIN CONNECTION
(Top view)
2/16
N
°
NAME
FUNCTION
1 SUPPLY VOLTAGE Unregulated voltage input. An internal regulator powers the
internal logic.
2 FEEDBACK INPUT The feedback terminal of the regulation loop. The output is
connected directly to this terminal for 5.1V operation; it is
connected via a divider for higher voltages.
3 FREQUENCY
COMPENSATION
A series RC network connected between this terminal and
ground determines the regulation loop gain characteristics.
4 GROUND Common ground terminal.
5 OSCILLATOR A parallel RC network connected to this terminal determines the
switching frequency.
6 SOFT START Soft start time constant. A capacitor is connected between this
terminal and ground to define the soft start time constant. This
capacitor also determines the average short circuit output
current.
7 OUTPUT Regulator output.
PIN FUNCTIONS
Symbol Parameter Value Unit
V
1
Input voltage 50 V
V
1
- V
7
Input to output voltage difference 50 V
V
7
Negative output DC voltage -1 V
Negative output peak voltage at t = 0.1
µ
s; f = 100KHz -5 V
V
3
, V
6
Voltage at pin 3 and 6 5.5 V
V
2
Voltage at pin 2 7V
I
3
Pin 3 sink current 1 mA
I
5
Pin 5 source current 20 mA
P
tot
Power dissipation at T
case
≤
90
°
C15W
T
j
, T
stg
Junction and storage temperature -40 to 150
°
C
ABSOLUTE MAXIMUM RATINGS
L4960
Symbol Parameter Test Conditions Min. Typ. Max. Unit
DYNAMIC CHARACTERISTICS
V
o
Output voltage range V
i
= 46V I
o
= 1A V
ref
40 V
V
i
Input voltage range V
o
= V
ref
to 36V I
o
= 2.5A 9 46 V
∆
V
o
Line regulation V
i
= 10V to 40V V
o
= V
ref
I
o
= 1A 15 50 mV
∆
V
o
Load regulation V
o
= V
ref
I
o
= 0.5A to 2A 10 30 mV
V
ref
Internal reference voltage
(pin 2)
V
i
= 9V to 46V I
o
= 1A 5 5.1 5.2 V
∆
V
ref
∆
T
Average temperature
coefficient of refer voltage
T
j
= 0
°
C to 125
°
C
I
o
= 1A
0.4
mV/
°
C
V
d
Dropout voltage I
o
= 2A 1.4 3 V
I
om
Maximum operating load
current
V
i
= 9V to 46V
V
o
= V
ref
to 36V
2.5 A
I
7L
Current limiting threshold
(pin 7)
V
i
= 9V to 46V
V
o
= V
ref
to 36V
3
4.5 A
I
SH
Input average current V
i
= 46V; output short-circuit 30 60 mA
η
Efficiency f = 100KHz V
o
= V
ref
75 %
I
o
= 2A V
o
= 12V 85 %
SVR Supply voltage ripple
rejection
∆
V
i
= 2V
rms
fripple
= 100Hz
V
o
= V
ref
Io = 1A
50 56
dB
f Switching frequency 85 100 115 KHz
∆
f
∆
V
i
Voltage stability of
switching frequency
V
i
= 9V to 46V
0.5
%
∆
f
∆
T
j
Temperature stability of
switching frequency
T
j
= 0
°
C to 125
°
C
1
%
f
max
Maximum operating
switching frequency
V
o
= V
ref
I
o
= 2A 120 150
KHz
T
sd
Thermal shutdown
junction temperature
150
°
C
ELECTRICAL CHARACTERISTICS
(Refer to the test circuit, T
j
= 25
°
C, V
i
= 35V, unless otherwise
specified)
Symbol Parameter Value Unit
R
th j-case
Thermal resistance junction-case max 4
°
C/W
R
th j-amb
Thermal resistance junction-ambient max 50
°
C/W
THERMAL DATA
3/16
L4960
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

L4960

Mfr. #:
Buy L4960
Manufacturer:
STMicroelectronics
Description:
Switching Voltage Regulators 5.1 to 40V 2.5 Amp
Lifecycle:
New from this manufacturer.
Delivery:
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