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L4962EH/A

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
®
L4962
1.5A POWER SWITCHING REGULATOR
1.5A OUTPUT CURRENT
5.1V TO 40V OUTPUT 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 L4962 is a monolithic power switching regula-
tor delivering 1.5A 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 operating mode.
June 2000
ORDERING NUMBERS
: L4962/A (12 + 2 + 2 Powerdip)
L4962E/A (Heptawatt
Vertical)
L4962EH/A (Horizontal
Heptawatt)
The L4962 is mounted in a 16-lead Powerdip plastic
package and Heptawatt package and requires very
few external components.
Efficient operation at switching frequencies up to
150KHz allows a reduction in the size and cost of
external filter components.
HEPTAWATT
POWERDIP
(12 + 2 + 2)
BLOCK DIAGRAM
Pin X = Powerdip
Pin (X) = Heptawatt
1/16
PIN CONNECTION
(Top view)
2/16
Symbol Parameter Heptawatt Powerdip
R
th j-case
Thermal resistance junction-case max 4
°
C/W -
R
th j-pins
Thermal resistance junction-pins max - 14
°
C/W
R
th j-amb
Thermal resistance junction-ambient max 50
°
C/W 80
°
C/W*
* Obtained with the GND pins soldered to printed circuit with minimized copper area.
THERMAL DATA
HEPTAWATT POWERDIP NAME
FUNCTION
1 7 SUPPLY VOLTAGE Unregulated voltage input. An internal regulator powers
the internal logic.
2 10 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 11 FREQUENCY
COMPENSATION
A series RC network connected between this terminal
and ground determines the regulation loop gain
characteristics.
PIN FUNCTIONS
Symbol Parameter Value Unit
V
7
Input voltage 50 V
V
7
- V
2
Input to output voltage difference 50 V
V
2
Negative output DC voltage -1 V
Output peak voltage at t = 0.1
µ
s; f = 100KHz -5 V
V
11
, V
15
Voltage at pin 11, 15 5.5 V
V
10
Voltage at pin 10 7 V
I
11
Pin 11 sink current 1 mA
I
14
Pin 14 source current 20 mA
P
tot
Power dissipation at T
pins
≤
90
°
C (Powerdip)
T
case
≤
90
°
C (Heptawatt)
4.3
15
W
W
T
j
, T
stg
Junction and storage temperature -40 to 150
°
C
ABSOLUTE MAXIMUM RATINGS
L4962
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
= 1.5A 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 1.5A 8 20 mV
V
ref
Internal reference voltage
(pin 10)
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
= 1.5A 1.5 2 V
I
om
Maximum operating load
current
V
i
= 9V to 46V
V
o
= V
ref
to 36V
1.5
A
I
2L
Current limiting threshold
(pin 2)
V
i
= 9V to 46V
V
o
= V
ref
to 36V
2
3.3 A
I
SH
Input average current V
i
= 46V; output short-circuit 15 30 mA
η
Efficiency f = 100KHz V
o
= V
ref
70 %
I
o
= 1A V
o
= 12V 80 %
SVR Supply voltage ripple
rejection
∆
V
i
= 2V
rms
fripple
= 100Hz
V
o
= V
ref
Io = 1A
50 56
dB
ELECTRICAL CHARACTERISTICS
(Refer to the test circuit, T
j
= 25
°
C, V
i
= 35V, unless otherwise
specified)
HEPTAWATT POWERDIP NAME
FUNCTION
4 4, 5, 12, 13 GROUND Common ground terminal.
5 14 OSCILLATOR A parallel RC network connected to this terminal
determines the switching frequency. This pin must be
connected to pin 7 input when the internal oscillator is
used.
6 15 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 2 OUTPUT Regulator output.
1, 3, 6,
8, 9, 16
N.C.
PIN FUNCTIONS
(cont’d)
3/16
L4962
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

L4962EH/A

Mfr. #:
Buy L4962EH/A
Manufacturer:
STMicroelectronics
Description:
Switching Voltage Regulators 5.0 to 40V Step-Down
Lifecycle:
New from this manufacturer.
Delivery:
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