L4960
PIN CONNECTION
(Top view)
ABSOLUTE MAXIMUM RATINGS
Symbol
V
1
V
1
- V
7
V
7
V
3
, V
6
V
2
I
3
I
5
P
tot
T
j
, T
stg
Parameter
Input voltage
Input to output voltage difference
Negative output DC voltage
Negative output peak voltage at t = 0.1
µ
s; f = 100KHz
Voltage at pin 3 and 6
Voltage at pin 2
Pin 3 sink current
Pin 5 source current
Power dissipation at T
case
≤
90
°
C
Junction and storage temperature
Value
50
50
-1
-5
5.5
7
1
20
15
-40 to 150
Unit
V
V
V
V
V
V
mA
mA
W
°C
PIN FUNCTIONS
N°
1
NAME
SUPPLY VOLTAGE
FUNCTION
Unregulated voltage input. An internal regulator powers the
internal logic.
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.
A series RC network connected between this terminal and
ground determines the regulation loop gain characteristics.
Common ground terminal.
A parallel RC network connected to this terminal determines the
switching frequency.
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.
Regulator output.
2
FEEDBACK INPUT
3
FREQUENCY
COMPENSATION
GROUND
OSCILLATOR
4
5
6
SOFT START
7
OUTPUT
2/16
STMICROELECTRONICS [ STMICROELECTRONICS ]
