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PDF LM26400Y Data sheet ( Hoja de datos )
| Número de pieza | LM26400Y | |
| Descripción | 500kHz Wide Input Range Buck Regulator | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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February 2007
LM26400Y
Dual 2A, 500kHz Wide Input Range Buck Regulator
General Description
The LM26400Y is a monolithic, two-output fixed frequency
PWM step-down DC/DC regulator in a 16-pin LLP or thermally
enhanced ETSSOP package. With a minimum number of ex-
ternal components and internal loop compensation, the
LM26400Y is easy to use. The ability to drive 2A loads with
an internal 175mΩ NMOS switch using state-of-the-art 0.5µm
BiCMOS technology results in a high-power density design.
The world class control circuitry allows for an ON-time as low
as 40 ns, thus supporting high-frequency conversion over the
entire input range of 3V to 20V and down to an output voltage
of only 0.6V. The LM26400Y utilizes peak current-mode con-
trol and internal compensation to provide high-performance
regulation over a wide range of line and load conditions.
Switching frequency is internally set to 500kHz, optimal for a
broad range of applications in terms of size versus thermal
tradeoffs. Given a non-synchronous architecture, efficiencies
above 90% are easy to achieve. External shutdown is includ-
ed, enabling separate turn-on and turn-off of the two chan-
nels. Additional features include programmable soft-start
circuitry to reduce inrush current, pulse-by-pulse current limit
and frequency foldback, integrated bootstrap structure and
thermal shutdown.
Features
■ Input voltage range of 3-20V
■ Dual 2A output
■ Output voltage down to 0.6V
■ Internal compensation
■ 500kHz PWM frequency
■ Separate enable pins
■ Separate soft start pins
■ Frequency foldback protection
■ 175mΩ NMOS switch
■ Integrated bootstrap diodes
■ Over-current protection
■ ETSSOP and LLP packages
■ Thermal shutdown
Applications
■ DTV-LCD
■ Set-Top Box
■ XDSL
■ Automotive
■ Computing Peripherals
■ Industrial Controls
■ Point of Load
Typical Application
© 2007 National Semiconductor Corporation 202002
20200252
www.national.com
1 page  
Symbol
ΔISS
VFB_F
Parameter
Difference Between SS1 and
SS2 Currents
FB1 and FB2 Frequency Fold-
back Threshold
Conditions
Min Typ Max Units
3 µA
0.35 V
Thermal Characteristics
Symbol
θJA
θJC
TSD
TSD_HYS
Description
Conditions
Junction-to-Ambient Thermal Mount package on a standard board (Note 5) and
Resistance (Note 4)
test per JESD51-7 standard.
Junction-to-Case-Bottom
Thermal Resistance
Thermal Shutdown
Threshold
Junction temperature rises.
Thermal Shutdown
Hysteresis
Junction temperature falls from above TSD.
Typical Value
TSSOP
LLP
28 26
3 2.8
165
15
Unit
°C/W
°C
Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating Ratings are conditions under which the device is
intended to be functional, but specific performance is not guaranteed. For guaranteed performance limits and associated test conditions, see Electrical
Characteristics table.
Note 2: EN1 and EN2 pins should never be higher than VIN + 0.3V.
Note 3: The human body model is a 100pF capacitor discharged through a 1.5 kΩ resistor into each pin. Test method is per JESD-22-A114.
Note 4: Value is highly board-dependent. For comparison of package thermal performance only. Not recommended for prediction of junction temperature in real
applications. See THERMAL CONSIDERATIONS for more information.
Note 5: A standard board refers to a four-layer PCB with the size 4.5”x3”x0.063”. Top and bottom copper is 2 oz. Internal plane copper is 1 oz. For details refer
to JESD51-7 standard.
5 www.national.com
5 Page 
Block Diagram
20200204
11 www.national.com
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LM26400Y.PDF ] | |
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