L4978 STMicroelectronics, L4978 Datasheet - Page 3

• Manufacturer Part Number: L4978
• Description: IC REG SW 2A STEP DOWN 8-DIP
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L4978

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 3.3 ~ 50 V
• Current - Output: 2A
• Frequency - Switching: 100kHz ~ 300kHz
• Voltage - Input: 8 ~ 55 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Power - Output: 1W
• Output Voltage: 50 V
• Output Current: 2 A
• Input Voltage: 8 V to 55 V
• Switching Frequency: 90 KHz to 110 KHz
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: Through Hole
• Duty Cycle (max): 97 %
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6701-5; E-L4978; E-L4978; L4978

Table 3. Pin Description (continued)
(*) Pins 1, 7, 8, 9, 10, 15 and 16 are not internally, electrically connected to the die.
Table 4. Thermal Data
(*) Package mounted on board.
Table 5. Absolute Maximum Ratings
R
Symbol
Minidip
V
th(j-amb)
N°
4
5
6
7
8
V
6
V
V
V
V
V
I
-V
4
4
8
5
6
7
2
Symbol
5
T
j
P
,T
tot
stg
Thermal Resistance Junction to ambient
5, 6
V
Pin
11
12
13
14
V
S016
12
V
V
I
5
V
V
5
V
,
11
13
-V
,I
12
14
V
3
6
6
11
COMP
BOOT
Name
Input voltage
Output DC voltage
Output peak voltage at t = 0.1ms f=200KHz
Maximum output current
Bootstrap voltage
Analogs input voltage (V
Analogs input voltage (V
(VCC= 20V)
Power dissipation a Tamb ≤ 60°C
Junction and storage temperature
OUT
V
FB
CC
Stepdown regulator output
Unregulated DC input voltage
A capacitor connected between this pin and OUT allows to drive the internal DMOS
Transistors
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.
Parameter
CC
CC
= 24V)
= 24V)
Parameter
Function
Max.
DIP-8
SO16
Minidip
90 (*)
-40 to 150
Value
-0.3
0.8
58
14
-1
-5
70
12
13
1
6
110 (*)
SO16
int. limit.
Unit
W
W
°C
L4978
°C/W
V
V
V
V
V
V
V
V
V
Unit
3/13