L7986TA STMicroelectronics, L7986TA Datasheet - Page 4

• Manufacturer Part Number: L7986TA
• Description: 3A step-down switching regulator
• Manufacturer: STMicroelectronics

Specifications of L7986TA

• Low Dropout Operation: 100% duty cycle

Pin settings
1
1.1
1.2
4/43
Pin settings
Pin connection
Figure 1.
Pin description
Table 1.
N.
1
2
3
4
5
6
7
8
Pin connection (top view)
Pin description
SYNCH
COMP
Type
GND
OUT
F
V
EN
FB
SW
CC
Regulator output
Master/slave synchronization. When it is left floating, a signal with a
phase shift of half a period respect to the power turn on 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, with
zero phase shift.
Connecting together the SYNCH pin of two devices, the one with higher
frequency works as master and the other one as slave; so the two powers
turn on have a phase shift of half a period.
A logical signal (active high) enable the device. With EN higher than 1.2 V
the device is ON and with EN is lower than 0.3V the device is OFF.
Error amplifier output to be used for loop frequency compensation
Feedback input. Connecting the output voltage directly to this pin the
output voltage is regulated at 0.6V. To have higher regulated voltages an
external resistor divider is required from Vout to FB pin.
The switching frequency can be increased connecting an external
resistor from FSW pin and ground. If this pin is left floating the device
works at its free-running frequency of 250 kHz.
Ground
Unregulated DC input voltage
Doc ID 022098 Rev 1
Description
L7986TA