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PDF LM27222 Data sheet ( Hoja de datos )
| Número de pieza | LM27222 | |
| Descripción | High-Speed 4.5A Synchronous MOSFET Driver | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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www.DataSheet4U.com
March 2006
LM27222
High-Speed 4.5A Synchronous MOSFET Driver
General Description
The LM27222 is a dual N-channel MOSFET driver designed
to drive MOSFETs in push-pull configurations as typically
used in synchronous buck regulators. The LM27222 takes
the PWM output from a controller and provides the proper
timing and drive levels to the power stage MOSFETs. Adap-
tive shoot-through protection prevents damaging and effi-
ciency reducing shoot-through currents, thus ensuring a ro-
bust design capable of being used with nearly any MOSFET.
The adaptive shoot-through protection circuitry also reduces
the dead time down to as low as 10ns, ensuring the highest
operating efficiency. The peak sourcing and sinking current
for each driver of the LM27222 is about 3A and 4.5Amps
respectively with a Vgs of 5V. System performance is also
enhanced by keeping propagation delays down to 8ns. Effi-
ciency is once again improved at all load currents by sup-
porting synchronous, non-synchronous, and diode emulation
modes through the LEN pin. The minimum output pulse
width realized at the output of the MOSFETs is as low as
30ns. This enables high operating frequencies at very high
conversion ratios in buck regulator designs. To support low
power states in notebook systems, the LM27222 draws only
5µA from the 5V rail when the IN and LEN inputs are low or
floating.
Features
n Adaptive shoot-through protection
n 10ns dead time
n 8ns propagation delay
n 30ns minimum on-time
n 0.4Ω pull-down and 0.9Ω pull-up drivers
n 4.5A peak driving current
n MOSFET tolerant design
n 5µA quiescent current
n 30V maximum input voltage in buck configuration
n 4V to 6.85V operating voltage
n SO-8 and LLP packages
Applications
n High Current Buck And Boost Voltage Converters
n Fast Transient DC/DC Power Supplies
n Single Ended Forward Output Rectification
n CPU And GPU Core Voltage Regulators
Typical Application
FIGURE 1.
© 2006 National Semiconductor Corporation DS201179
20117902
www.national.com
1 page  
Electrical Characteristics (Note 4) (Continued)
VCC = CB = 5V, SW = GND = 0V, unless otherwise specified. Typicals and limits appearing in plain type apply for TA = TJ =
+25˚C. Limits appearing in boldface type apply over the entire operating temperature range (-40˚C ≤ TJ ≤ 125˚C).
Symbol
Parameter
Conditions
Min Typ Max Units
Ileak_LEN LEN pin Leakage Current
LEN = 0V, Source Current
LEN = 5V, Sink Current
200 nA
33 µA
LOGIC
VIH_LEN
VIL_LEN
VIH_IN
VIL_IN
LEN Low to High Threshold
LEN High to Low Threshold
IN Low to High Threshold
IN High to Low Threshold
Threshold Hysteresis
Low to High Transition
High to Low Transition
Low to High Transition
High to Low Transition
65 % of VCC
30 % of VCC
65 % of VCC
30 % of VCC
0.7 V
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating ratings are conditions under which the device operates
correctly. Operating Ratings do not imply guaranteed performance limits.
Note 2: The SW pin can have -2V to -0.5 volts applied for a maximum duty cycle of 10% with a maximum period of 1 second. There is no duty cycle or maximum
period limitation for a SW pin voltage range of -0.5V to 30 Volts.
Note 3: Maximum allowable power dissipation is a function of the maximum junction temperature, TJMAX, the junction-to-ambient thermal resistance, θJA, and the
ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using: PMAX = (TJMAX-TA) / θJA. The junction-to-
ambient thermal resistance, θJA, for the LM27222M, it is 165˚C/W. For a TJMAX of 150˚C and TA of 25˚C, the maximum allowable power dissipation is 0.76W. The
θJA for the LM27222SD is 42˚C/W. For a TJMAX of 150˚C and TA of 25˚C, the maximum allowable power dissipation is 3W.
Note 4: Min and Max limits are 100% production tested at 25˚C. Limits over the operating temperature range are guaranteed through correlation using Statistical
Quality Control (SQC) methods. Limits are used to calculate National’s Average Outgoing Quality Level (AOQL).
Timing Diagram
20117904
5 www.national.com
5 Page 
Notes
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves
the right at any time without notice to change said circuitry and specifications.
For the most current product information visit us at www.national.com.
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS
WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body, or
(b) support or sustain life, and whose failure to perform when
properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to result
in a significant injury to the user.
2. A critical component is any component of a life support
device or system whose failure to perform can be reasonably
expected to cause the failure of the life support device or
system, or to affect its safety or effectiveness.
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Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain
no ‘‘Banned Substances’’ as defined in CSP-9-111S2.
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Email: [email protected]
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11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet LM27222.PDF ] | |
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