L5985 STMicroelectronics, L5985 Datasheet - Page 29

• Manufacturer Part Number: L5985
• Description: IC REG SW STEP DOWN 2A 8-VFQFPN
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L5985

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 0.6 ~ 18 V
• Current - Output: 2A
• Frequency - Switching: 250kHz ~ 1MHz
• Voltage - Input: 2.9 ~ 18 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-VFQFN, 8-VFQFPN
• Power - Output: 1.5W
• Output Voltage: 3 V
• Output Current: 2 A
• Input Voltage: 2.9 V to 18 V
• Switching Frequency: 220 KHz to 275 KHz
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: SMD/SMT
• Duty Cycle (max): 100 %
• Low Dropout Operation: 100% duty cycle
• For Use With: 497-6387 - BOARD EVAL FOR L5985
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L5985
5.7
Application circuit
In
Figure 18. Demonstration board application circuit
Table 9.
Figure 18
Reference
VIN=3.3V to 18V
VIN=3.3V to 18V
VIN=3.3V to 18V
VIN=3.3V to 18V
10uF
10uF
10uF
10uF
C1
C1
C1
C1
C1
C2
C3
C4
C5
C6
R1
R2
R3
R4
R5
D1
L1
the demonstration board application circuit is shown.
Component list
68nF
68nF
68nF
68nF
C6
C6
C6
C6
GRM31CR61C226KE15B
GRM31CR61E106KA12
GND
GND
GND
GND
VCC
VCC
VCC
VCC
INH
INH
INH
INH
Part number
7447779006
STPS2L25V
R5 100K
R5 100K
8
8
8
8
7
7
7
7
Doc ID 13006 Rev 5
3
3
3
3
FSW
FSW
FSW
FSW
6
6
6
6
L5985
L5983
L5985
L5983
COMP
COMP
COMP
COMP
COMP
COMP
COMP
COMP
4
4
4
4
R4 2.49K
R4 2.49K
R4 2.49K
R4 2.49K
2
2
2
2
1
1
1
1
1
1
1
1
5
5
5
5
C5 220pF
C5 220pF
C5 220pF
C5 220pF
4.99 kΩ, 1%, 0.1 W 0603
2.49 kΩ, 1%, 0.1 W 0603
100 kΩ, 1%, 0.1 W 0603
1.1 kΩ, 1%, 0.1 W 0603
330 Ω, 1%, 0.1 W 0603
OUT
OUT
OUT
OUT
SYNCH
SYNCH
SYNCH
SYNCH
FB
FB
FB
FB
6.8 µH, 30%, 2.91 A
C4 10nF
C4 10nF
C4 10nF
C4 10nF
220 pF, 50 V
Description
2.2 nF, 50 V
10 µF, 25 V
22 µF, 16 V
68 nF, 25 V
10 nF, 50V
2 A, 25 V
R2 1.1K
R2 1.1K
R2 1.1K
R2 1.1K
D1
D1
D1
D1
STPS2L25U
STPS2L25U
STPS2L25U
STPS2L25U
L1 6.8uH
L1 6.8uH
L1 6.8uH
L1 6.8uH
R3 330
R3 330
R3 330
R3 330
R1 4.99K
R1 4.99K
R1 4.99K
R1 4.99K
Application information
C3 2.2nF
C3 2.2nF
C3 2.2nF
C3 2.2nF
STMicroelectronics
Wurth elektronik
Manufacturer
MURATA
MURATA
Vout=3.3V
Vout=3.3V
Vout=3.3V
Vout=3.3V
22uF
22uF
22uF
22uF
C2
C2
C2
C2
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