L4978 STMicroelectronics, L4978 Datasheet - Page 4

• 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

L4978
Table 6. Electrical Characteristcs
(T
to T
4/13
DYNAMIC CHARACTERISTIC
SOFT START
INHIBIT
DC CHARACTERISTICS
ERROR AMPLIFIER
SVRR E/A
j
Symbol
I
SVRR
= 25°C, C
o source
I
I
j
qst-by
o sink
V
V
V
I
I
V
V
V
R
g
qop
from 0 to 125°C
V
sLL
f
I
I
I
FB
oH
LL
q
oL
b
s
m
l
o
d
L
I
Operating input voltage range
Output voltage
Dropout voltage
Maximum limiting current
Efficiency
Switching frequency
Supply voltage ripple rejection
Switching Frequency Stability
vs.
Temp. stability of switching
frequency
Soft start charge current
Soft start discharge current
Low level voltage
Isource Low level
Total operating quiescent
current
Quiescent current
Total stand-by quiescent
current
Voltage Feedback Input
Line regulation
Ref. voltage stability vs
temperature
High level output voltage
Low level output voltage
Source output current
Sink output current
Source bias current
Supply voltage ripple rejection
DC open loop gain
Transconductance
osc
V
= 2.7nF, R
cc
Parameter
osc
= 20kΩ, V
CC
V
I
I
V
V
V
V
V
I
V
T
Duty Cycle = 0; VFB= 3.8V
V
V
V
V
V
V
V
V
R
I
V
o
o
o
comp
j
= 24V, unless otherwise specified). “
o
cc
cc
cc
o
i
cc
inh
cc
cc
FB
FB
comp
comp
comp
comp
L
= 2.5A; f
= 0.5A
= 0.2 to 2A
= 0 to 125°C
= V
=
= 3.3 to 50V; I
= 3.3V; I
= 10V; I
= 8 to 55V
= 8 to 55V
= 8 to 55V
= 55V; V
= 8 to 55V
< 0.9V
= 2.5V
= 3.8V
∞
= -0.1 to 0.1mA
= 6V; V
cc
= 6V; V
= V
= 6V
Test Condition
+2V
FB
ripple
o
o
RMS
; V
= 2A
inh
= 2A
FB
FB
<0.9V
cc
= 100Hz
= 2.5V
; V
= 3.8V
o
= 8 to 55V
= 2A
o
= V
ref
;
●
●
●
●
●
●
●
●
3.292
Min.
3.33
3.22
3.33
10.3
180
200
2.5
90
60
30
60
50
8
6
●
" Specification Referred
Typ.
3.36
3.36
3.36
0.58
3.36
100
100
150
220
300
2.5
0.4
2.5
87
40
10
80
57
3
3
4
5
4
5
2
3.427
0.733
1.173
Max.
3.39
3.39
0.65
110
200
300
3.5
3.5
0.9
3.5
55
50
14
15
10
6
6
3
mV/°C
Unit
KHz
mA
mA
mV
mS
dB
µA
µA
µA
µA
µA
µA
µA
µA
dB
dB
%
%
%
V
V
V
V
V
V
A
V
V
V
V