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LM46002QPWPTQ1 PDF预览

LM46002QPWPTQ1

更新时间： 2024-11-27 01:09:23
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德州仪器 - TI /
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52页 1736K
描述
SIMPLE SWITCHER 3.5 V to 60 V 2 A Synchronous Step-Down Voltage Converter

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Sample &  
Buy  
Support &  
Community  
Product  
Folder  
Tools &  
Software  
Technical  
Documents  
LM46002-Q1  
SNVSAA2A –JULY 2015–REVISED AUGUST 2015  
®
LM46002-Q1 SIMPLE SWITCHER 3.5 V to 60 V 2 A Synchronous Step-Down Voltage  
Converter  
1 Features  
3 Description  
The LM46002-Q1 SIMPLE SWITCHER® regulator is  
an easy to use synchronous step-down DC-DC  
converter capable of driving up to 2 A of load current  
from an input voltage ranging from 3.5 V to 60 V. The  
LM46002-Q1 provides exceptional efficiency, output  
accuracy and drop-out voltage in a very small  
solution size. An extended family is available in  
various load current options and 36 V maximum input  
voltage in pin-to-pin compatible packages, including  
LM46001, LM46000, LM43603, LM43602, LM43601  
and LM43600. Peak current mode control is  
1
•
AEC-Q100 Qualified (–40°C to +125°C Operating  
Junction Temperature)  
•
•
•
•
•
27 µA Quiescent Current in Regulation  
High Efficiency at Light Load (DCM and PFM)  
Tested to EN55022/CISPR 22 EMI standards  
Integrated Synchronous Rectification  
Adjustable Frequency Range: 200 kHz to 2.2 MHz  
(500 kHz default)  
•
•
•
Frequency Synchronization to External Clock  
Internal Compensation  
employed  
to  
achieve  
simple  
control  
loop  
compensation and cycle-by-cycle current limiting.  
Optional features such as programmable switching  
Stable with Almost Any Combination of Ceramic,  
Polymer, Tantalum, and Aluminum Capacitors  
frequency,  
synchronization,  
power-good  
flag,  
precision enable, internal soft-start, extendable soft-  
start, and tracking provide a flexible and easy to use  
•
•
•
•
•
•
•
•
Power-Good Flag  
Soft-Start into Pre-Biased Load  
platform for  
a
wide range of applications.  
Internal Soft-Start: 4.1 ms  
Discontinuous conduction and automatic frequency  
reduction at light loads improve light load efficiency.  
The family requires few external components. Pin  
arrangement allows simple, optimum PCB layout.  
Protection features include thermal shutdown, VCC  
under-voltage lockout, cycle-by-cycle current limit,  
and output short circuit protection. The LM46002-Q1  
device is available in the HTSSOP / PWP 16 leaded  
package (5.1 mm x 6.6 mm x 1.2 mm) with 0.65 mm  
lead pitch.  
Extendable Soft-Start Time by External Capacitor  
Output Voltage Tracking Capability  
Precision Enable to Program System UVLO  
Output Short Circuit Protection with Hiccup Mode  
Over Temperature Thermal Shutdown Protection  
2 Applications  
•
•
•
•
•
•
Sub-AM Band 12 V and 24 V Automotive  
Industrial Power Supplies  
Device Information(1)  
PART NUMBER  
PACKAGE  
BODY SIZE (NOM)  
Telecommunications Systems  
LM46002-Q1  
HTSSOP (16)  
5.1 mm x 6.6 mm  
Commercial Vehicle Power Supplies  
General Purpose Wide VIN Regulation  
High Efficiency Point-Of-Load Regulation  
(1) For all available packages, see the orderable addendum at  
the end of the datasheet.  
4 Simplified Schematic  
Radiated Emission Graph  
VIN = 24 V, VOUT = 3.3 V, FS= 500 kHz, IOUT = 2 A  
L
80  
VOUT  
VIN  
Evaluation Board  
VIN  
SW  
70  
60  
50  
40  
30  
20  
10  
0
EN 55022 Class B Limit  
EN 55022 Class A Limit  
COUT  
CIN  
LM46002-Q1  
CBOOT  
CBOOT  
BIAS  
ENABLE  
PGOOD  
CBIAS  
CFF  
RFBT  
SS/TRK  
RT  
FB  
VCC  
SYNC  
AGND  
RFBB  
CVCC  
PGND  
0
200  
400  
600  
800  
1000  
Frequency (MHz)  
C001  
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,  
intellectual property matters and other important disclaimers. PRODUCTION DATA.  
 
 
 
 
 
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