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LM25005 Scheda tecnica(PDF) 3 Page - Texas Instruments

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Il numero della parte LM25005
Spiegazioni elettronici  LM25005 42V, 2.5A Step-Down Switching Regulator
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
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LM25005
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SNVS411C – JANUARY 2006 – REVISED MARCH 2013
PIN DESCRIPTIONS (continued)
Pin(S)
Name
Description
Application Information
Current measurement connection for the re-circulating diode. An
internal sense resistor and a sample/hold circuit sense the diode
15, 16
IS
Current sense
current near the conclusion of the off-time. This current
measurement provides the DC level of the emulated current
ramp.
The source terminal of the internal buck switch. The SW pin
17, 18
SW
Switching node
should be connected to the external Schottky diode and to the
buck inductor.
This open drain output can be connected to SW pin to aid
charging the bootstrap capacitor during very light load conditions
Pre-charge assist for the bootstrap
or in applications where the output may be pre-charged before
19
PRE
capacitor
the LM25005 is enabled. An internal pre-charge MOSFET is
turned on for 250ns each cycle just prior to the on-time interval
of the buck switch.
An external capacitor is required between the BST and the SW
pins. A 0.022µF ceramic capacitor is recommended. The
20
BST
Boost input for bootstrap capacitor
capacitor is charged from Vcc via an internal diode during the
off-time of the buck switch.
Exposed metal pad on the underside of the device. It is
NA
EP
Exposed Pad
recommended to connect this pad to the PWB ground plane, in
order to aid in heat dissipation.
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.
Absolute Maximum Ratings
(1) (2)
VIN to GND
45V
BST to GND
60V
PRE to GND
45V
SW to GND (Steady State)
-1.5V
BST to VCC
45V
VCC to GND
14V
BST to SW
14V
OUT to GND
Limited to Vin
SD, SYNC, SS, FB to GND
7V
ESD Rating(3)
Human Body Model
2kV
Storage Temperature Range
-65°C to +150°C
(1)
Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which
operation of the device is intended to be functional. For ensured specifications and test conditions, see the Electrical Characteristics .
(2)
If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
(3)
The human body model is a 100pF capacitor discharged through a 1.5k
Ω resistor into each pin.
Operating Ratings
(1)
VIN
7V to 42V
Operation Junction Temperature
−40°C to + 125°C
(1)
Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which
operation of the device is intended to be functional. For ensured specifications and test conditions, see the Electrical Characteristics .
Copyright © 2006–2013, Texas Instruments Incorporated
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