L4976D(2000) 查看數據表（PDF） - STMicroelectronics
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L4976D Datasheet PDF : 11 Pages
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L4976
BLOCK DIAGRAM
THERMAL
SHUTDOWN
VOLTAGES
MONITOR
2
VREF
VREF
7
COMP
8
E/A
FB
3.3V
INTERNAL
5.1V REFERENCE
PWM
3.3V
R
Q
S
OSCILLATOR
3
OSC
1
GND
PIN CONNECTIONS
VCC
5
CBOOT
CHARGE
DRIVE
6
BOOT
CBOOT
CHARGE
AT LIGHT
LOADS
4
OUT
GND
1
VREF
2
OSC
3
OUT
4
8
FB
7
COMP
6
BOOT
5
VCC
Minidip
N.C.
GND
VREF
OSC
OUT
OUT
N.C.
N.C.
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
SO16W
N.C.
N.C.
FB
COMP
BOOT
VCC
N.C.
N.C.
PIN FUNCTIONS
DIP SO (*)
1
2
2
3
3
4
Name
GND
VREF
OSC
4 5, 6
OUT
5
11
VCC
6
12
BOOT
7
13
COMP
8
14
FB
Function
Ground
5.1V Reference voltage with 20mA current capability.
An external resistor connected between the unregulated input voltage and this pin and
a capacitor connected from this pin to ground fix the switching frequency. (Line feed
forward is automatically obtained)
Stepdown regulator output
Unregulated DC input voltage
A capacitor connected between this pin and OUT allows to drive the internal VDMOS
E/A output to be used for frequency compensation
Stepdown feedback input. Connecting directly to this pin results in an output voltage of
3.3V. An external resistive divider is required for higher output voltages.
(*) Pins 1, 7, 8, 9, 10, 15 and 16 are not internally, electrically connected to the die.
2/11
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