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PDF LM2725 Data sheet ( Hoja de datos )

Número de pieza LM2725
Descripción High Speed Synchronous MOSFET Drivers
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo



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November 2000
LM2725/LM2726
High Speed Synchronous MOSFET Drivers
General Description
The LM2725/LM2726 is a family of dual MOSFET drivers
that can drive both the top MOSFET and bottom MOSFET in
a push-pull structure simultaneously. It takes a logic level
PWM input and splits it into two complimentary signals with
a typical 20ns dead time in between. The built-in
shoot-through protection circuitry prevents the top and bot-
tom FETs from turning on simultaneously. With a bias volt-
age of 5V, the peak sourcing and sinking current for each
driver of the LM2725 is about 1.2A and that of the LM2726 is
about 3A. In an SO-8 package, each driver is able to handle
50mA
average
current.
Input
UVLO
(Under-Voltage-Lock-Out) ensures that all the driver outputs
stay low until the supply rail exceeds the power-on threshold
during system power on, or after the supply rail drops below
power-on threshold by a specified hysteresis during system
power down. The cross-conduction protection circuitry de-
tects both the driver outputs and will not turn on a driver until
the other driver output is low. The top gate bias voltage
needed by the top MOSFET can be obtained through an
external bootstrap structure. Minimum pulse width is as low
as 55ns.
Features
n High peak output current
n Adaptive shoot-through protection
n 36V SW pin absolute maximum voltage
n Input Under-Voltage-Lock-Out
n Typical 20ns internal delay
n Plastic 8-pin SO package
Applications
n High Current DC/DC Power Supplies
n High Input Voltage Switching Regulators
n Microprocessors
Typical Application
Connection Diagram
8-Lead Small Outline Package
© 2000 National Semiconductor Corporation DS200072
Top View
DS200072-2
DS200072-1
www.national.com

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LM2725 pdf
Electrical Characteristics
LM2726 (Continued)
VCC = CBOOT = 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.
Symbol
Parameter
Condition
Min Typ Max Units
BOTTOM DRIVER
t1
Pull-down Delay
Timing Diagram, from
PWM_IN Rising Edge
13 ns
LOGIC
Vuvlo_up
Power On Threshold
VCC rises from 0V toward
5V
2.8
V
Vuvlo_dn
Under-Voltage-Lock-Out
Threshold
2.5 V
Vuvlo_hys
Under-Voltage-Lock-Out
Hysteresis
0.3 V
VIH_EN
VIL_EN
Ileak_EN
EN Pin High Input
EN Pin Low Input
EN Pin Leakage Current
EN = VCC = 5V
VCC = 5V, EN = 0V
2.4
−2
−2
V
0.25 V
2
µA
2
ton_min
toff_min
Minimum Positive Input
Pulse Width
(Note 4)
Minimum Negative Input
Pulse Width
(Note 5)
55
ns
55
VIH_PWM
VIL_PWM
PWM_IN High Level
Input Voltage
PWM_IN Low Level
Input Voltage
When PWM_IN pin goes
high from 0V
When PWM_IN pin goes
low from 5V
2.4
V
0.25
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: 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 LM2725/LM2726 is 172˚C/W. For a TJMAX of 150˚C and TA of 25˚C, the maximum allowable power dissipation is 0.7W.
Note 3: ESD machine model susceptibility is 100V.
Note 4: If after a rising edge, a falling edge occurs sooner than the specified value, the IC may intermittently fail to turn on the bottom gate when the top gate is off.
As the falling edge occurs sooner and sooner, the driver may start to ignore the pulse and produce no output.
Note 5: If after a falling edge, a rising edge occurs sooner than the specified value, the IC may intermittently fail to turn on the top gate when the bottom gate is off.
As the rising edge occurs sooner and sooner, the driver may start to ignore the pulse and produce no output.
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