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UCD7242-EP Datasheet Preview

UCD7242-EP Datasheet

Digital Dual Synchronous-Buck Power Driver

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UCD7242-EP
www.ti.com
SLVSBY2 – OCTOBER 2013
Digital Dual Synchronous-Buck Power Driver
Check for Samples: UCD7242-EP
FEATURES
1
• Fully Integrated Power Switches With Drivers
for Dual Synchronous Buck Converters
• Full Compatibility With TI Fusion Digital Power
Supply Controllers, Such as the UCD92xx
Family
• Wide Input Voltage Range: 4.75 V to 18 V
Operational Down to 2.2-V Input With an
External Bias Supply
• Up to 10-A Output Current per Channel
• Operational to 2-MHz Switching Frequency
• High Side Current Limit With Current Limit
Flag
• Onboard Regulated 6 V Driver Supply From VIN
• Thermal Protection
• Temperature Sense Output – Voltage
Proportional to Chip Temperature
• UVLO and OVLO Circuits Ensure Proper Drive
Voltage
• RoHS Compliant
• Accurate On-Die Current Sensing (±5%)
APPLICATIONS
• Digitally-Controlled Synchronous-Buck Power
Stages
• High Current Dual-Phase VRM/EVRD
Regulators for Desktop, Server, Telecom and
Notebook Processors
SUPPORTS DEFENSE, AEROSPACE,
AND MEDICAL APPLICATIONS
• Controlled Baseline
• One Assembly and Test Site
• One Fabrication Site
• Available in Military (–55°C to 125°C)
Temperature Range
• Extended Product Life Cycle
• Extended Product-Change Notification
• Product Traceability
TMON
VIN
PWM-B
SRE-B
FLT-B
VGGDIS
IMON-B
BST-B
PWM-A
SRE-A
FLT-A
IMON-A
BST-A
BSW-B
SW-B
BSW-A
SW-A
PGND
PGND
GND BP3 VGG
DESCRIPTION
The UCD7242 is a complete power system ready to drive two independent buck power supplies (see Figure 1).
High side MOSFETs, low side MOSFETs, drivers, current sensing circuitry and necessary protection functions
are all integrated into one monolithic solution to facilitate minimum size and maximum efficiency. Driver circuits
provide high charge and discharge current for the high-side NMOS switch and the low-side NMOS synchronous
rectifier in a synchronous buck circuit. The MOSFET gates are driven to +6.25 V by an internally regulated VGG
supply. The internal VGG regulator can be disabled to permit the user to supply an independent gate drive
voltage. This flexibility allows a wide power conversion input voltage range of 2.2 V to 18 V. Internal under
voltage lockout (UVLO) logic ensures VGG is good before allowing chip operation.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2013, Texas Instruments Incorporated




etcTI

UCD7242-EP Datasheet Preview

UCD7242-EP Datasheet

Digital Dual Synchronous-Buck Power Driver

No Preview Available !

UCD7242-EP
SLVSBY2 – OCTOBER 2013
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
DESCRIPTION (CONTINUED)
The synchronous rectifier enable (SRE) pin controls whether or not the low-side MOSFET is turned on when the
PWM signal is low. When SRE is high the part operates in continuous conduction mode for all loads. In this
mode the drive logic block uses the PWM signal to control both the high-side and low-side gate drive signals.
Dead time is also optimized to prevent cross conduction. When SRE is low, the part operates in discontinuous
conduction mode at light loads. In this mode the low-side MOSFET is always held off.
On-board comparators monitor the current through the high side switch to safeguard the power stage from
sudden high current loads. Blanking delay is set for the high side comparator to avoid false reports coincident
with switching edge noise. In the event of an over-current fault, the high-side FET is turned off and the Fault Flag
(FLT) is asserted to alert the controller.
MOSFET current is measured and monitored by a precision integrated current sense element. This method
provides an accuracy of ±5% over most of the load range. The amplified signal is available for use by the
controller on the IMON pin.
An on-chip temperature sense converts the die temperature to a voltage at the TMON pin for the controller’s use.
If the die temperature exceeds 170°C, the temperature sensor initiates a thermal shutdown that halts output
switching and sets the FLT flag. Normal operation resumes when the die temperature falls below the thermal
hysteresis band.
VIN
VIN
VIN
TMON
30 31 32
19
27 28 29
UCD7242
VIN
VOUT-B
PWM-B
1
SRE-B
2
FLT -B
9
Drive
Logic
IMON-B
7
BST-B
3
BSW-B
4
SW-B
13
PGND
10
11
12
Current
Sense
Processor
VIN
Driver
Driver
8
Testmode
21
GND
Thermal
Sense
VIN
VGG
Generator
VDD LDO
Drive
Logic
Current
Sense
Processor
VIN
Driver
Driver
6
22
VGG DIS BP3
5
VGG
Short
PWM-A
26
SRE-A
25
FLT -A
18
IMON-A
20
BST-A
24
BSW-A
23
SW-A
14
PGND
15
16
17
VOUT-A
Figure 1. Typical Application Circuit and Block Diagram
2
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Product Folder Links: UCD7242-EP
Copyright © 2013, Texas Instruments Incorporated


Part Number UCD7242-EP
Description Digital Dual Synchronous-Buck Power Driver
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