E-L4978D STMicroelectronics, E-L4978D Datasheet - Page 5

• Manufacturer Part Number: E-L4978D
• Description: IC REG SW 2A STEP DOWN 16-SOIC
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

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

Table 6. Electrical Characteristcs
(T
to T
Figure 4. Test and evaluation board circuit.
Figure 5. PCB and component layout of the figure 4.
OSCILLATOR SECTION
j
Symbol
= 25°C, C
j
from 0 to 125°C
Ramp Valley
Ramp peak
Maximum duty cycle
Maximum Frequency
osc
Vi=8V to 55V
220µF
= 2.7nF, R
63V
C
C1=220µF/63V EKE
C2=2.7nF
C5=100nF
C6=100nF
C7=220nF/63V
C8=330µF/35V CG Sanyo
L1=126µH KoolMu 77120 - 55 Turns - 0.5mm
R1=20K
R2=9.1K
D1=STPS3L60U
1
Parameter
220nF
C
7
osc
= 20kΩ, V
2.7nF
20K
R
C
1
2
100nF
C
CC
5
V
V
Duty Cycle = 0%
R
5
3
2
22nF
= 24V, unless otherwise specified). “
cc
cc
osc
C
4
= 8V
= 55V
= 13kΩ, C
Test Condition
7
L4978
9.1K
R
2
1
osc
= 820pF
100nF
6
C
V
STPS3L60U
6
3.3
5.1
O
12
15
18
24
D98IN834B
(V)
8
4
D1
L4978
R3(KΩ)
2.7
12
16
20
30
0
(77120)
126µH
L1
330µF
Min.
0.78
C
95
R4(KΩ)
8
2
9
4.7
4.7
4.7
4.7
4.7
●
" Specification Referred
V
Typ.
0.85
2.15
O
9.6
97
=3.3V/2A
R
R
3
4
Max.
0.92
10.2
300
2.3
L4978
Unit
kHz
%
V
V
V
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