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ISL85012 Datasheet(PDF) 2 Page - Renesas Technology Corp

Part No. ISL85012
Description  12A, 3.8V to 18V Input, Synchronous Buck Regulator
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Maker  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
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ISL85012 Datasheet(HTML) 2 Page - Renesas Technology Corp

 
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ISL85012
FN8677 Rev.2.00
Page 2 of 19
Mar 17, 2017
Typical Application Schematic
FIGURE 2. TYPICAL APPLICATION SCHEMATIC FOR EXTERNAL COMPENSATION
FB
PVIN
PHASE
GN D
CO MP
EN
PG
DNC
DN C
B OOT
VD D
FR EQ
SYN C
12
34
5
6
7
8
10
9
11
12
13
14
15
MO D E
VIN
C in
C 5
L1
C OUT
VOUT
GN D
R 1
C 1
R 2
C 3
VIN
GN D
C 4
R 3
3x22 µF
1µF
4.5-18 V
47pF
100 nF
2.2µF
0.68µH
3x 100 µF
CERAMIC
1.8 V/12A
C 2
330 pF
20k

80 .6 k

10k

PVIN
9
PHASE
8
GN D
7
TABLE 1. DESIGN TABLE FOR DIFFERENT OUTPUT VOLTAGE
VOUT (V)
0.9
1
1.2
1.5
1.8
2.5
3.3
5
VIN (V)
4.5 to 18
4.5 to 18
4.5 to 18
4.5 to 18
4.5 to 18
4.5 to 18
4.5 to 18
6 to 18
FREQ (kHz)
300
300
300
600
600
600
600
600
Compensation
Internal
Internal
Internal
Internal
Internal
Internal
Internal
Internal
Cin (µF)
3x22
3x22
3x22
3x22
3x22
3x22
3x22
3x22
Cout (µF)
2x560 + 4x100 2x330 + 3x100 2x330 + 3x100
4x100
3x100
4x47
4x47
4x47
L1 (µH)
0.68
0.68
1
0.68
0.68
1
1
1.5
R1 (kΩ)
100
100
147
150
200
301
365
365
R2 (kΩ)
200
150
147
100
100
95.3
80.6
49.9
C1 (pF)
DNP
DNP
DNP
10
4.7
4.7
3.3
3.3
NOTES:
1. The design table is referencing the schematic shown in Figure 1.
2. Ceramic capacitors are selected for 22µF and 100µF in the table.
3. 560µF (14mΩ) and 330µF (10mΩ) are selected low ESR conductive polymer aluminum solid capacitors.
4. Inductor 7443340068 (0.68µH), 7443340100 (1µH) and 7443340150 (1.5µH) from Wurth Electronics are selected for the above applications.
5. Recommend to keep the inductor peak-to-peak current less than 5A.
TABLE 2. KEY DIFFERENCES BETWEEN FAMILY OF PARTS
PART NUMBER
INTERNAL/EXTERNAL
COMPENSATION
EXTERNAL FREQUENCY
SYNC
PROGRAMMABLE
SOFT-START
SWITCHING
FREQUENCY (kHz)
CURRENT
RATING (A)
ISL85003
Yes
Yes
No
500
3
ISL85003A
Yes
No
Yes
500
3
ISL85005
Yes
Yes
No
500
5
ISL85005A
Yes
No
Yes
500
5
ISL85012
Yes
Yes
No
300 or 600 selectable
12


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