E-L5970D STMicroelectronics, E-L5970D Datasheet - Page 11

• Manufacturer Part Number: E-L5970D
• Description: IC REGULATOR SW STEPDWN 8-SOIC
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of E-L5970D

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.2 ~ 35 V
• Current - Output: 1A
• Frequency - Switching: 250kHz
• Voltage - Input: 4.4 ~ 36 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Power - Output: 750mW
• Output Voltage: 35 V
• Mounting Style: SMD/SMT
• For Use With: 497-8849 - BOARD DEMO STW9N150 100W 3PHASE
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-4563-5

L5970D
6
Application ideas
Figure 18. Dual output voltage with auxiliary winding
Figure 19. Buck-boost regulator
Figure 20. Positive Buck-Boost regulator
Figure 21. Synchronization example
VIN=5V
C1
10uF
25V
Ceramic
Vin=5V Vout=12V Iout=0.3A Efficiency=76%
C1
10uF
25V
Ceramic
C1
10uF
25V
Ceramic
VIN=12V
VIN=12V
Vin=12V Vout=-12V Iout=0.5A Efficiency=81%
VIN
C2
220pF
10uF
35V
Ceramic
C2
C2
220pF
C3
22nF
R3
4.7k
C3
220pF
COMP
R3
4.7k
VCC
C3
22nF
SYNC VREF
COMP
VCC
COMP
8
4
VCC
C4
22nF
R3
4.7k
SYNC VREF
2
8
COMP
SYNC VREF
4
VCC
2
L5970
8
4
3.3V
6
U1
SYNC VREF
2
GND
L5970D
3.3V
8
4
6
U1
2
7
GND
L5970D
6
GND
7
3
L5970
1
5
3.3V
INH
6
U1
7
FB
3
OUT
GND
1
5
INH
OUT
FB
3
7
1
5
D1
STPS2L25U
INH
OUT
FB
3
1
5
INH
OUT
FB
D1
STPS25L25U
COMP
VCC
N1/N2=2
24k
L1
33uH
2.7k
SYNC VREF
8
4
2
Lp=22uH
M1
STN4NE03L
D2
1N4148
D1
STPS2L25U
C5
100uF
16V
L5970D
6
L1
33uH
GND
D2
STPS2L25U
7
C4
100uF
10V
2.7k
24k
Application ideas
3
1
5
INH
VOUT=-12V/0.3A
OUT
FB
VOUT=12V/0.3A
C4
100uF
16V
VOUT1=5V
30mA
VOUT=3.3V
0.5A
C5
47uF
10V
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