ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
CC
Supply Voltage (I
CC
< 50mA) (*) selflimit V
I
OUT
Output Peak Pulse Current 1.5 A
Analog Inputs & Outputs (6,7) -0.3 to 8 V
Analog Inputs & Outputs (1,2,3,4,5,15,14, 13, 16) -0.3 to 6 V
P
tot
Power Dissipation @ T
amb
= 70°C (DIP16)
@ T
amb
= 50°C (SO16)
1
0.83
W
W
T
j
Junction Temperature, Operating Range -40 to 150 °C
T
stg
Storage Temperature, Operating Range -55 to 150 °C
(*) maximum package power dissipation limits must be observed
THERMAL DATA
Symbol Parameter Value Unit
R
th j-amb
Thermal Resistance Junction -Ambient
(DIP16)
80 °C/W
Thermal Resistance Junction -Ambient
(SO16)
120 °C/W
PIN FUNCTIONS
N. Name Function
1 SYNC Synchronization. A synchronization pulse terminates the PWM cycle and discharges Ct
2 RCT Oscillator pin for external C
T
, R
A
, R
B
components
3 DC Duty Cycle control
4 VREF 5.0V +/-1.5% reference voltage @ 25°C
5 VFB Error Amplifier Inverting input
6 COMP Error Amplifier Output
7 SS Soft start pin for external capacitor Css
8V
CC
Supply for internal "Signal" circuitry
9V
C
Supply for Power section
10 OUT High current totem pole output
11 PGND Power ground
12 SGND Signal ground
13 ISEN Current sense
14 DIS Disable. It must never be left floating. TIE to SGND if not used.
15 DC-LIM Connecting this pin to Vref, DC is limited to 50%. If it is left floating or grounded no limitation is
imposed
16 ST-BY Standby. Connect a resistor to RCT. Connect to VREF or floating if not used.
SYNC
RCT
DC
VREF
VFB
SS
COMP
1
3
2
4
5
6
7OUT
SGND
PGND
ISEN
DIS
DC-LIM
ST-BY16
15
14
13
12
10
11
V
CC
8V
C
9
PIN CONNECTION
L5991 - L5991A
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