ISL78235 Datasheet, PDF (4/20 Pages) Intersil Corporation – 5A Automotive Synchronous Buck Regulator

ISL78235
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART
MARKING
OUTPUT VOLTAGE
(V)
TEMP. RANGE
(°C)
PACKAGE
(RoHS Compliant)
PKG.
DWG. #
ISL78235ARZ
8235
Adjustable
-40°C to +105°C 16 Ld 3x3mm TQFN
L16.3x3D
ISL78235EVAL1Z
Evaluation Board
NOTES:
1. Add “-T*” suffix for tape and reel. Please refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials and 100% matte tin
plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-free
products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device information page for ISL78235. For more information on MSL, please see tech brief TB363.
Typical Application Diagram
2.7V TO 5.5V
VIN
C₁
2x22μF
CERAMIC
POWER GOOD
INDICATOR
EXTERNAL
SYNCHRONIZATION
INPUT
R₁
100k
ENABLE INPUT
1
VIN
2 _VDD
3 _PG
4
SYNC
ISL78235
R_FS
C_SS
L₁
0.68uH
C₂
2x22μF
CERAMIC
PGND
+1.8V/5A
PGND
R₂
200k
C₃*
VOUT
SGND
FB
R₃
100k
RCOMP
CCOMP
*C3 IS OPTIONAL. IT IS
RECOMMENDED TO PUT A
PLACEHOLDER FOR IT AND CHECK
LOOP ANALYSIS BEFORE USE.
FIGURE 4. TYPICAL APPLICATION DIAGRAM
TABLE 1. COMPONENT SELECTION TABLE WITH INTERNAL COMPENSATION
V_OUT
1.2V
1.5V
1.8V
2.5V
3.3V
C₁
2 x 22µF
2 x 22µF
2 x 22µF
2 x 22µF
2 x 22µF
C₂ (Note 4)
3 x 22µF
3 x 22µF
2 x 22µF
2 x 22µF
2 x 22µF
C₃
22pF
10pF
10pF
10pF
10pF
L₁
0.33µH - 0.68µH
0.33µH - 0.68µH
0.33µH - 0.68µH
0.47µH - 0.78µH
0.47µH - 0.78µH
R₂
100kΩ
150kΩ
200kΩ
316kΩ
450kΩ
R₃
100kΩ
100kΩ
100kΩ
100kΩ
100kΩ
NOTE:
4. C₂ values are minimum recommended values for ceramic capacitors. Higher capacitance may be needed based on system requirements.
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FN8713.2
July 1, 2015