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UCD7232RTJR
Digital Control Compatible Synchronous-Buck Gate Driver with Current Sense and Fault Protection
UCD7232
www.ti.com SLUSAH3 –MAY 2011
Digital Control Compatible Synchronous-Buck Gate Driver
With Current Sense and Fault Protection
Checkfor Samples: UCD7232
1FEATURES
DESCRIPTION•
Dual High Current Drivers. The UCD7232 high current driver is specifically•
Full Compatibility withTI Fusion Digital Power designed for digitally-controlled, point-of-load,
Supply Controllers, suchas UCD91xx and synchronous buck switching power supplies. Two
UCD92xx Families driver circuits provide high charge and discharge
Operationalto2 MHz Switching Frequency current for the high-side NMOS switch and the
low-side NMOS synchronous rectifier in a•
High-Side FET and Output Current Limit synchronous buck circuit. The MOSFET gates are
Protection with Independently Adjustable driven by an internally regulated VGG supply. The
Thresholds internal VGG regulator can be disabledto permit the•
Fast High-Side Overcurrent Sense Circuit with user to supply their own gate drive voltage. This
Fault Flag Output–
Prevents Catastrophic flexibility allowsa wide power conversion input
Current Levels ona Cycle-by-Cycle Basis voltage rangeof 2.2to 15V. Internal under voltage
lockout (UVLO) logic insures VGGis good before•
Differential High-Gain Current Sense Amplifier allowing chip operation.•
Voltage Proportionalto Load Current Monitor drive logic block allows operationin oneof two
Outputmodes selected by the SRE Mode pin. In•
Wide Input Voltage Range: 4.7Vto15V Synchronous Mode, the logic block uses the PWM
Operationto 2.2V Input Supported with an signalto control both the high-side and low-side gate
External 4.5-6.5V Bias Supply drive signals. Dead timeis automatically adjustedto
prevent cross conduction. The Synchronous Rectifier•
Onboard Regulated Supplies for Gate DriveEnable (SRE) pin controls whetheror not the low-side
and Internal CircuitsFETis turned on when the PWM signalis low.In•
Integrated Thermal Shutdown Independent Mode, the PWM and SRE pins control•
Selectable Operation Modes: the high-side and low-side gates directly. No
anti-cross-conduction logicis usedin this mode.–
PWM plus Synchronous Rectifier Enable
(SRE) with Automatic Dead-Time Control On-board comparators monitor the voltage across the
Direct High-Gate and Low-Gate Inputs for high side switch and the voltage across an external
Direct FET Control current sense elementto safeguard the power stage
from sudden high current loads. Blanking delayis set
for Power Stage Shutdown for the high side comparator bya single resistorin
Circuit orderto avoid false reports coincident with switching
+125°C Junction edge noise.In the eventofa high-side faultor an high-side FET turned off andis assertedto alert the digital
controller. The fault by the HS Sense
PowerOutput currentis measured anda
Stages for Single- precision, high gain, switched capacitor differential amplifier that processes an external current sense element.
signalis available digital controller on
the IMON The has
offsetof 0.5V so that both positive (sourcing) and
negative (sinking) current canbe sensed.
