SI4728CY Datasheet, PDF (1/9 Pages) Vishay Siliconix – N-Channel Synchronous MOSFETs with Break-Before-Make

Si4728CY
Vishay Siliconix
N-Channel Synchronous MOSFETs with Break-Before-Make
FEATURES
D 4.5- to 30-V Operation
D Driver Impedance—3 W
D Undervoltage Lockout
D Fast Switching Times (30 ns typ.)
D 30-V MOSFETs
D High Side: 0.018 W @ V_DD = 4.5 V
D Low Side: 0.0105 W @ V_DD = 4.5 V
D Switching Frequency: 250 kHz to 1 MHz
DESCRIPTION
The Si4728CY n-channel synchronous MOSFET with
break-before-make (BBM) is a high speed driver designed to
operate in high frequency dc-dc switchmode power supplies.
It’s purpose is to simplify the use of n-channel MOSFETs in
high frequency buck regulators. This device is design to be
used with any single output PWM IC or ASIC to produce a
highly efficient low cost synchronous rectifier converter. A
synchronous enable pin (disable = low, enable = high)
controls the synchronous function for light load conditions.
The Si4728CY is packaged in Vishay Siliconix’s high
performance LITTLE FOOTR SO-16 package.
FUNCTIONAL BLOCK DIAGRAM
4.5 V to 30 V
5V
DC-DC
Controller
GND
V_DD
Si4728 CBOOT
D₁
SYNC EN
MOSFET
Drive Circuitry
with
Break-Before-
Make
IN
GND
Q₁
S₁
D₂
Q₂
S₂
C_BOOT
V_OUT
+
GND
Document Number: 71286
S-03075—Rev. C, 03-Feb-03
www.vishay.com
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