ISL78208 Datasheet, PDF (4/25 Pages) Intersil Corporation – Wide VIN Dual Standard Buck Regulator with 3A/3A Continuous Output Current

ISL78208
Pin Descriptions (Continued)
PIN NUMBER
12
27
28
29
4, 8, 14, 17, 21
30
26, 31
EPAD
SYMBOL
PIN DESCRIPTION
VCC
Output of the internal 5V linear regulator. Decouple to PGND with a minimum of 4.7µF ceramic capacitor.
This pin is provided only for internal bias of ISL78208 (not to be loaded with current over 10mA).
SYNCOUT
Synchronization output. Provides a signal that is the inverse of the SYNCIN signal.
SYNCIN
Connect to an external signal for synchronization from 300kHz to 2MHz (negative edge trigger). SYNCIN is
not allowed to be floating.
When SYNCIN = logic 0, PHASE1 and PHASE2 are running at 180° out-of-phase.
When SYNCIN = logic 1, PHASE1 and PHASE2 are running at 0° in-phase.
When SYNCIN = an external clock, PHASE1 and PHASE2 are running at 180° out-of-phase.
External SYNC frequency applied to the SYNCIN pin should be at least 2.4 times the internal switching
frequency setting.
SGND
Signal ground connections. The exposed pad must be connected to SGND and soldered to the PCB. All
voltage levels are measured with respect to this pin.
NC1, NC2, NC3, NC4, This is a no connection pin.
NC5
FS
Frequency selection pin. Tie to VCC for 500kHz switching frequency. Connect a resistor to GND for
adjustable frequency from 300kHz to 2MHz.
PGOOD2, PGOOD1 Open drain power-good output that is pulled to ground when the output voltage is below regulation limits
or during the soft-start interval. There is an internal 5MΩ internal pull-up resistor.
PD
The exposed pad must be connected to the system GND plane with as many vias as possible for proper
electrical and thermal performance.
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART
MARKING
TEMP. RANGE
(°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL78208ARZ
ISL7820 8ARZ
-40 to +105
32 Ld WFQFN
L32.5x5H
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 ISL78208. For more information on MSL please see techbrief TB363.
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FN8354.0
July 12, 2013