Datasheet

L5970AD
2/11
Table 2. Thermal Data
(*) Package mounted on board
Figure 3. Pin Connection (top view)
Table 3. Pin Description
Table 4. Absolute Maximum Ratings
Symbol Parameter Value Unit
R
th (j-amb)
Thermal Resistance Junction to ambient Max. 120 (*) °C/W
N. Name Description
1 OUT Regulator Output.
2 SYNC Master/Slave Synchronization. When it is open, a signal synchronous with the turn-off of the inter-
nal power is present at the pin. When connected to an external signal at a frequency higher than
the internal one, then the device is synchronized by the external signal.
Connecting together the SYNC pin of two devices, the one with the higher frequency works as
master and the other one, works as slave.
3INH
A logical signal (active high) disables the device. With IHN higher than 2.2V the device is OFF and with
INH lower than 0.8V, the device is ON.
If INH is not used the pin must be grounded. When it is open, an internal pull-up disables the device.
4 COMP E/A output to be used for frequency compensation.
5 FB Stepdown feedback input. Connecting the output voltage directly to this pin results in an output
voltage of 1.235V. An external resistor divider is required for higher output voltages (the typical
value for the resistor connected between this pin and ground is 4.7K).
6V
REF
Reference voltage of 3.3V. No filter capacitor is needed to stability.
7 GND Ground.
8V
CC
Unregulated DC input voltage.
Symbol Parameter Value Unit
V
8
Input Voltage 40 V
V
1
Output DC voltage
Output peak voltage at t = 0.1µs
-1 to 40
-5 to 40
V
V
I
1
Maximum output current int. limit.
V
4
, V
5
Analog pins 4 V
V
3
INH -0.3V to V
CC
V
2
SYNC -0.3 to 4 V
P
tot
Power dissipation at T
amb
≤ 60°C 0.75 W
T
j
Operating junction temperature range -40 to 150 °C
T
stg
Storage temperature range -55 to 150 °C
OUT
SYNC
INH
COMP
1
3
2
4
VCC
VREF
GND
FB
8
7
6
5
D98IN955