LV58082MX Datasheet, PDF (4/5 Pages) Sanyo Semicon Device – Step-down Switching Regulator

LV58082MX
Pin Function
Pin No. Pin name
Function
1 BOOT
Upper MOS transistor boot strap capacitance connection pin.
Connect the boot capacitance of about 0.01μF between SW
pins.
To protect the SW pin’s absolute maximum rating, to ensure
stable operation, and to eliminate noise, the boot capacitance
serial resistance (about 100Ω) Rb proves effective.
2
VIN
Input voltage pin.
Connect substantially large (20μF or more) capacitance
between this pin and GND.
3 SW
Power switch pin.
Connect the output LC filter. Connect the above capacitance
between this pin and BOOT pin.
4 GND
Ground pin.
5 FB
Feedback pin.
Sets the output voltage by means of split resistor in the section
of the output voltage VOUT - FB - GND. VOUT setting is made
as calculated below:
VOUT
=
Vref
×
{
1
+
(R1
+ R10)
R3
}
Vref = 0.8V
Example: 3.3V output voltage
(See Block Diagram and Sample Application Circuit)
VOUT
=
0.8
×
{
1
+
(27k + 4.3k)
10k
}
8 SS
=3.304V
Soft start pin.
Sets the soft start time by means of the built-in 10μA source
voltage and external soft start capacity. The soft start capacity
C6 can be set as follows:
C6
=
10μA
×
Tss
Vref
Where, Tss is the soft start time and Vref is the reference
voltage.
Example: 1.2ms soft start time achieved
C6
=
10μA
×
1.2ms
0.8 V
=
0.015μF
6 COMP
Phase compensation pin.
Connects with the phase compensation external capacitance
and resistance of DC/DC converter close loop.
VIN
SS
VIN
Equivalent circuit
VIN
CBOOT
Hi side MOS
SW
Low side MOS
Internal regulation line
10μA
FB
VREF
0.8V
Internal regulation line
COMP
Clump circuit
7 EN
Enable pin.
Converter enabled when set to the HIGH voltage and disabled
when LOW voltage or OPEN state.
VIN
EN
Q117
2pF
No.A1863-4/5