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| ISL78236 Datasheet, PDF (7/24 Pages) Intersil Corporation – Dual 3A Current Sharing 2.5MHz High Efficiency Synchronous Buck Regulator | |||
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ISL78236
Pin Descriptions (Continued)
PIN
NUMBER
14
SYMBOL
SS
DESCRIPTION
SS is used to adjust the soft-start time. When SS pin is tied to VIN, SS time is 1.5ms. SS pin is tied to VIN only in dual
output mode operation. SS pin is tied to a soft-start capacitor only in parallel current sharing mode operation. Connect
a capacitor from SS to SGND to adjust the soft-start time. CSS should not be larger than 33nF. This capacitor, along
with an internal 5µA current source, sets the soft-start interval of the converter, tSS.
CSSïïFï = 6.25 ï tSSïsï
(EQ. 1)
15
16, 17
2, 3
18, 19
20, 21
22, 23
25
VDD
VIN1,
VIN2
LX1
PGND1
PGND2
PAD
Input supply voltage for the logic. VDD to be at the same potential as VIN +0.3/-0.5V.
Input supply voltage. Connect 22µF ceramic capacitor to power ground per channel.
Switching node connection for Channel 1.
Negative supply for the power stage of Channel 1.
Negative supply for the power stage of Channel 2.
The exposed pad must be connected to the SGND pin for proper electrical performance. Add as many vias as possible
to connect the PAD to a ground plane for optimal thermal performance.
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART
MARKING
TEMP. RANGE
(°C)
PACKAGE
(Pb-free)
PKG.
DWG. #
ISL78236ARZ
782 36ARZ
-40 to +105
24 Ld 4x4 QFN
L24.4x4D
ISL78236DUALEVAL1Z
Evaluation Board
ISL78236CRSHEVAL1Z
Evaluation Board
NOTES:
1. Add â-T*â 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 product information page for ISL78236. For more information on MSL, please see tech brief TB363.
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7
FN8624.0
April 28, 2014
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