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Power Driver. UCD7242 Datasheet

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Power Driver. UCD7242 Datasheet
















UCD7242 Driver. Datasheet pdf. Equivalent













Part

UCD7242

Description

Digital Dual Synchronous-Buck Power Driver



Feature


UCD7242 www.ti.com SLUS962B – JANUAR Y 2010 – REVISED AUGUST 2012 Digital Dual Synchronous-Buck Power Driver Che ck for Samples: UCD7242 FEATURES 1 • Fully Integrated Power Switches With D rivers for Dual Synchronous Buck Conver ters • Full Compatibility With TI Fus ion Digital Power Supply Controllers, S uch as the UCD92xx Family • Wide Inpu t Voltage Range: 4.75 V to 1.
Manufacture

Texas Instruments

Datasheet
Download UCD7242 Datasheet


Texas Instruments UCD7242

UCD7242; 8 V Operational Down to 2.2 V Input With an External Bias Supply • Up to 10A Output Current per Channel • Operatio nal to 2 MHz Switching Frequency • Hi gh Side Current Limit With Current Limi t Flag • Onboard Regulated 6 V Driver Supply From VIN • Thermal Protection • Temperature Sense Output – Volta ge Proportional to Chip Temperature • UVLO and OVLO Circuits Ensure Pro.


Texas Instruments UCD7242

per Drive Voltage • Rated From –40° C to 125°C Junction Temperature • Ro HS Compliant • Accurate On-Die Curren t Sensing (±5%) APPLICATIONS • Digi tally-Controlled Synchronous-Buck Power Stages • High Current Dual-Phase VRM /EVRD Regulators for Desktop, Server, T elecom and Notebook Processors TMON V IN PWM-B SRE-B FLT-B VGGDIS IMON-B BST -B PWM-A SRE-A FLT-A IMON-A BST-.


Texas Instruments UCD7242

A BSW-B SW-B BSW-A SW-A PGND PGND G ND BP3 VGG DESCRIPTION The UCD7242 is a complete power system ready to drive two independent buck power supplies (se e Figure 1). High side MOSFETs, low sid e MOSFETs, drivers, current sensing cir cuitry and necessary protection functio ns are all integrated into one monolith ic solution to facilitate minimum size and maximum effici.





Part

UCD7242

Description

Digital Dual Synchronous-Buck Power Driver



Feature


UCD7242 www.ti.com SLUS962B – JANUAR Y 2010 – REVISED AUGUST 2012 Digital Dual Synchronous-Buck Power Driver Che ck for Samples: UCD7242 FEATURES 1 • Fully Integrated Power Switches With D rivers for Dual Synchronous Buck Conver ters • Full Compatibility With TI Fus ion Digital Power Supply Controllers, S uch as the UCD92xx Family • Wide Inpu t Voltage Range: 4.75 V to 1.
Manufacture

Texas Instruments

Datasheet
Download UCD7242 Datasheet




 UCD7242
UCD7242
www.ti.com
SLUS962B – JANUARY 2010 – REVISED AUGUST 2012
Digital Dual Synchronous-Buck Power Driver
Check for Samples: UCD7242
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 10A 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
• Rated From –40°C to 125°C Junction
Temperature
• 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
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 2.2V to 18V. Internal under voltage
lockout (UVLO) logic ensures VGG is good before allowing chip operation.
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.
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 © 2010–2012, Texas Instruments Incorporated




 UCD7242
UCD7242
SLUS962B – JANUARY 2010 – REVISED AUGUST 2012
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)
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
UCD7242
27 28 29
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
Copyright © 2010–2012, Texas Instruments Incorporated




 UCD7242
www.ti.com
OPERATING
TEMPERATURE
RANGE, TA
–40°C to 125°C
UCD7242
PIN COUNT
32-pin
SLUS962B – JANUARY 2010 – REVISED AUGUST 2012
ORDERING INFORMATION
ORDERABLE PART
NUMBER
SUPPLY
PACKAGE
TOP SIDE MARKING
UCD7242RSJR
UCD7242RSJT
Reel of 2500
Reel of 250
QFN
UCD7242
ABSOLUTE MAXIMUM RATINGS(1)
over operating free-air temperature range (unless otherwise noted)
PARAMETER
VIN
Supply voltage
BST
Boot voltage
DC
AC (2)
VGG, VGG_DIS
BP3
Gate supply voltage
Logic supply voltage
SW, BSW
Switch voltage
DC
AC (2)
TMON, IMON, Testmode Analog outputs
PWM-A, PWM-B, SRE-A,
SRE-B, FLT-A, FLT-B
Digital I/O’s
TJ
Tstg
ESD rating
Junction temperature
Storage temperature
HBM: Human Body model
CDM: Charged device model
RATING
–0.3 to 20
–0.3 to SW + 7
34
7
4
–2 to VIN + 1
34
–0.3 to 3.6
–0.3 to 5.5
–55 to 150
–55 to 150
2000
500
VALUE
V
V
V
V
V
V
V
V
V
°C
°C
V
V
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings
only and functional operation of the device at these or any other condition beyond those indicated is not implied. Exposure to absolute-
maximum-rated conditions for extended periods may affect device reliability. All voltages are with respect to GND. Currents are positive
into, negative out of the specified terminal. Consult company packaging information for thermal limitations and considerations of
packages.
(2) AC levels are limited to within 5 ns.
DISSIPATION RATINGS (TYPICAL)
PACKAGE
AIRFLOW (LFM)
0 (natural convection)
RSJ
200
400
(1) Data taken using TI EVM.
RθJA TI EVM BOARD(1)
19.1°C/W
15.1°C/W
13.4°C/W
POWER RATING
TA = 25°C
5.2 W
6.6 W
7.5 W
POWER RATING
TA = 85°C
2.1 W
2.6 W
3.0 W
RECOMMENDED OPERATING CONDITIONS
over operating free-air temperature range (unless otherwise noted)
VIN
Power input voltage (internally generated VGG)
VIN
Power input voltage (externally generated VGG)
VGG
Externally supplied gate drive voltage
TJ
Operating junction temperature range
fs
Switching frequency
MIN TYP MAX UNIT
4.75
12
18
V
2.2
12
18
V
4.75 6.2
V
–40
125 °C
300 750 2000 kHz
Copyright © 2010–2012, Texas Instruments Incorporated
Product Folder Links: UCD7242
Submit Documentation Feedback
3




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