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UCD74120 Datasheet Preview

UCD74120 Datasheet

Synchronous Buck Power-Stage

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High-Current, Synchronous Buck Power Stage
Check for Samples: UCD74120
UCD74120
SLUSAV8 – OCTOBER 2012
1 FEATURES
1 Integrates Synchronous Buck Driver and
NexFET™ Power MOSFETS for High Power
Density and High Efficiency
• 25-A Output Current Capability for DSP and ASIC
• 4.7-V to 14-V Input Voltage Range
• Operational up to 2 MHz Switching Frequency
• Built-In High-Side Current Protection
• DCR Current Sensing for Overcurrent Protection
and Output Current Monitoring
• Voltage Proportional to Load Current Monitor
Output
• Tri-state PWM Input for Power Stage Shutdown
• UVLO Housekeeping Circuit
• Integrated Thermal Shutdown
• 40-Pin, 5 mm x 7 mm, PQFN PowerStack™
Package
2 APPLICATIONS
• Digital or Analog POL Power Modules
• High Power Density DC-DC Converters for
Telecom and Networking Applications
3 DESCRIPTION
UCD74120 is a multi-chip module integrating a driver
device and two NexFET power MOSFETs into a
thermally enhanced compact, 5 mm × 7 mm, QFN
package. A 25-A output current capability makes the
device suitable for powering DSP and ASIC. The
device is designed to complement digital or analog
PWM controllers. The PWM input of the driver device
is 3-state compatible. Two driver circuits provide high
charge and discharge current for the high-side N-
channel FET switch and the low-side N-channel FET
synchronous rectifier in a synchronous buck
converter.
Output current is measured and monitored by a
precision current sensing amplifier that processes the
voltage present across an external current sense
element. The amplified signal is available for use by
the PWM controller on the IMON pin. On-board
comparators monitor the voltage across the high-side
switch and the voltage across the external current
sense element to safeguard the power stage from
sudden high-current loads. Blanking delay is set for
the high-side comparator by a single resistor in order
to avoid false reports coincident with switching edge
noise. In the even of a high-side fault or an
overcurrent fault, the high-side FET is turned off and
the fault flag (FLT) is asserted to alert the PWM
controller.
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.




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UCD74120 Datasheet Preview

UCD74120 Datasheet

Synchronous Buck Power-Stage

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UCD74120
SLUSAV8 – OCTOBER 2012
3.1 APPLICATION DIAGRAM
From
Controller
To
Controller
SRE
FLT
PWM VDD
HS_SNS
IMON
SRE_MD
VIN
BOOT
BP3 UCD74120 SW
ILIM
CSP
RDLY
CSN
AVGG
VGG
VGG_DIS AGND PGND
www.ti.com
VIN
VOUT
UDG-11281
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.
TEMPERATURE
RANGE
–40°C to 125°C
ORDERING INFORMATION(1)
PINS
PACKAGE
40
RVF
ORDERING NUMBER
UCD74120RVF
(1) For the most current package and ordering information, see the Package Option Addendum at the end
of this document, or see the TI website at www.ti.com.
3.1 ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted)(1)
Voltage range
Temperature
VDD, VIN
SW DC
SW Pulse < 400 ns, E = 20 µJ
SW Pulse < 64 ns
SW Pulse < 40 ns
VGG, AVGG (Externally supplied)
BOOT DC
BOOT Pulse (SW at 20 V < 400 ns)
BOOT Pulse (SW at 22 V < 64 ns)
BOOT Pulse (SW at 25 V < 40 ns)
ILIM, VGG_DIS, IMON, FLT
CSP, CSN, RDLY, PWM, SRE, SRE_MD
HS_SNS
TJ
Tstg
VALUE
MIN
MAX
–0.3
16
–1
16
–2
20
–5
22
–7
25
–0.3
7
–0.3
23
–0.3
27
–0.3
29
–0.3
32
–0.3
3.6
–0.3
5.6
–0.3
16
–40
150
–55
150
UNIT
V
V
V
V
V
V
V
V
V
V
V
V
V
°C
°C
(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 included under “recommended operating
conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods of time may affect device reliability.
2
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Copyright © 2012, Texas Instruments Incorporated
Product Folder Links: UCD74120


Part Number UCD74120
Description Synchronous Buck Power-Stage
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