E-L4978D STMicroelectronics, E-L4978D Datasheet - Page 4
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E-L4978D
Manufacturer Part Number
E-L4978D
Description
IC REG SW 2A STEP DOWN 16-SOIC
Manufacturer
STMicroelectronics
Type
Step-Down (Buck)r
Datasheet
1.L4978.pdf
(13 pages)
Specifications of E-L4978D
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
Surface Mount
Package / Case
16-SOIC (0.300", 7.5mm Width)
Power - Output
800mW
Output Voltage
3.5 V
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
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