L4972A STMicroelectronics, L4972A Datasheet - Page 2

• Manufacturer Part Number: L4972A
• Description: IC REG SW 2A 5.1V-40V 20-DIP
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L4972A

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 5.1 ~ 40 V
• Current - Output: 2A
• Frequency - Switching: 100kHz
• Voltage - Input: 15 ~ 50 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Through Hole
• Package / Case: 20-DIP (0.300", 7.62mm)
• Power - Output: 5W
• Output Voltage: 50 V
• Mounting Style: Through Hole
• Input Voltage: 50V
• Output Current: 2A
• No. Of Outputs: 1
• Power Dissipation Pd: 5W
• No. Of Pins: 20
• Operating Temperature Range: -40°C To +150°C
• Filter Terminals: Through Hole
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6698-5; L4972A

L4972A
Table 2. Pin Description
Figure 3. Pin Connection (Top view)
2/22
5, 6 15,
12, 19
N°
16
10
11
13
14
17
18
20
1
2
3
4
7
8
9
FEEDBACK INPUT
SUPPLY VOLTAGE
COMPENSATION
RESET DELAY
RESET INPUT
FREQUENCY
BOOTSTRAP
OSCILLATOR
OSCILLATOR
SOFT START
SYNC INPUT
RESET OUT
GROUND
OUTPUT
V
N.C.
Pin
V
start
ref
FEEDBACK IN.
RESET DELAY
P. FAIL INPUT
FREQ. COMP.
SOFT START
BOOTSTRAP
SYNC INPUT
RESET OUT
A C
properly the internal D-MOS transistor.
A C
signal delay time.
Open Collector Reset/power Failand the output voltages are safe. Signal Output.
This output is high when the supply
Input of Power Fail Circuit. The threshold is 5.1V. It may be connected via a divider
to the input for power fail function. It must be connected to the pin 14 an external
30KΩ resistor when power fail signal not required.
Common Ground Terminal
A series RC network connected between this terminal and ground determines the
regulation loop gain characteristics.
Soft Start Time Constant. A capacitor is connected between the sterminal and
ground to define the soft start time constant.
The Feedback Terminal of the Regulation Loop. The output is connected directly to
this terminal for 5.1V operation; It is connected via a divider for higher voltages.
Multiple L4972A’s are synchronized by connecting pin 10 inputs together or via an
external syncr. pulse.
Unregulated Input Voltage.
Not Connected.
5.1V V
Internal Start-up Circuit to Drive the Power Stage.
R
current of C
C
frequency.
Regulator Output.
osc
osc
boot
d
. External resistor connected to ground determines the constant charging
. External capacitor connected to ground determines (with R
capacitor connected between this terminal and ground determines the reset
GND
GND
ref
capacitor connected between this terminal and the output allows to drive
Device Reference Voltage.
osc
.
1
2
3
4
5
6
7
8
9
10
DIP20
20
19
18
17
16
15
14
13
12
11
Function
OUTPUT
N.C.
C OSC
R OSC
GND
GND
Vstart
Vref
N.C.
Vi
osc
) the switching