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LM25574-Q1 数据表(PDF) 3 Page - Texas Instruments

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部件名 LM25574-Q1
功能描述  LM25574/LM25574-Q1 SIMPLE SWITCHER 42V, 0.5A Step-Down Switching Regulator
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

LM25574-Q1 数据表(HTML) 3 Page - Texas Instruments

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LM25574, LM25574-Q1
www.ti.com
SNVS483G – JANUARY 2007 – REVISED APRIL 2013
PIN DESCRIPTIONS (continued)
Pin(s)
Name
Description
Application Information
15
PRE
Pre-charge assist for the bootstrap
This open drain output can be connected to SW pin to aid
capacitor
charging the bootstrap capacitor during very light load conditions
or in applications where the output may be pre-charged before
the LM25574 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.
16
BST
Boost input for bootstrap capacitor
An external capacitor is required between the BST and the SW
pins. A 0.022µF ceramic capacitor is recommended. The
capacitor is charged from Vcc via an internal diode during the
off-time of the buck switch.
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
SD, VCC to GND
14V
BST to SW
14V
OUT to GND
Limited to Vin
SYNC, SS, FB, RAMP 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 guaranteed 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
6V 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 guaranteed specifications and test conditions, see the Electrical Characteristics.
Copyright © 2007–2013, Texas Instruments Incorporated
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