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7440650022 データシート(PDF) 10 Page - Texas Instruments

部品番号 7440650022
部品情報  3.5 V to 36 V Wide-VIN Synchronous 2.1 MHz Step-Down Converters
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI1 - Texas Instruments

7440650022 データシート(HTML) 10 Page - Texas Instruments

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CONTROL
LOGIC
DRIVER
HS CURRENT
SENSE
LS CURRENT
SENSE
OSCILLATOR
PWM
COMP.
ERROR
AMPLIFIER
MODE
LOGIC
RESET
CONTROL
SW
VIN
PGND
FB
EN
FPWM
INT. REG.
BIAS
BIAS
VCC
CBOOT
SYNC
AGND
*
*
* = Not used in -ADJ
RESET
1.0 V
Reference
ENABLE
LOGIC
Copyright © 2016, Texas Instruments Incorporated
10
LM53602, LM53603
SNVSAR0 – NOVEMBER 2016
www.ti.com
Product Folder Links: LM53602 LM53603
Submit Documentation Feedback
Copyright © 2016, Texas Instruments Incorporated
8 Detailed Description
8.1 Overview
The LM5360x family of devices are synchronous current mode buck regulators designed specifically for the Wide
Input voltage Industrial and automotive market. The regulator automatically switches between PWM and PFM
depending on load. At heavy loads the device operates in PWM at a switching frequency of 2.1 MHz. The
regulator's oscillator can also be synchronized to an external system clock. At input voltages above about 20 V,
the switching frequency reduces to maintain regulation during conditions of abnormally high battery voltage. At
light loads the mode changes to PFM, with diode emulation allowing DCM. This reduces input supply current and
keeps the efficiency high. The user can also choose to lock the mode in PWM (FPWM) so that the switching
frequency remains constant regardless of load.
A RESET flag is provided to indicate when the output voltage is near its regulation point. This feature includes
filtering and a delay before asserting. This helps to prevent false flag operation during output voltage transients.
Note that, throughout this data sheet, references to the LM53603 apply equally to the LM53602. The difference
between the two devices is the maximum output current and specified MOSFET current limits.
8.2 Functional Block Diagram


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