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LMR36503_V01

更新时间： 2024-02-11 23:00:00
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德州仪器 - TI /
页数 文件大小 规格书
45页 1702K
描述
LMR36503 3-V to 65-V, 0.3-A Ultra-Small Synchronous Buck Converter with Ultra-Low IQ

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LMR36503_V01 数据手册

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LMR36503  
SNVSBB4A – DECEMBER 2019 – REVISED DECEMBER 2020  
LMR36503 3-V to 65-V, 0.3-A Ultra-Small Synchronous Buck Converter  
with Ultra-Low IQ  
1 Features  
3 Description  
•
Designed for rugged industrial applications:  
– Junction temperature range –40°C to +150°C  
– Input transient protection up to 70 V  
– Wide input voltage range: 3.0 V (falling  
threshold) to 65 V  
– Low EMI and minimized switch node ringing  
– Adjustable, 5-V fixed output voltage options  
available  
The LMR36503 is the industry's smallest 65 V, 0.3 A  
synchronous step-down DC/DC converter in 2-mm x  
2-mm HotRod™ package. This easy-to-use converter  
can handle input voltage transients up to 70 V,  
provide excellent EMI performance and support fixed  
5 V and other adjustable output voltages. The  
transient tolerance reduces the necessary design  
effort to protect against input overvoltage and meets  
the surge immunity requirements of IEC 61000-4-5.  
•
•
Suited for scalable industrial power supplies:  
– Pin compatible with LMR36506 (65 V, 600 mA)  
– Adjustable switching frequency: 200 kHz to 2.2  
MHz with RT pin variant  
Minimized solution size and cost:  
– Highest power density with internal  
compensation and reduced external component  
count  
The LMR36503 uses the peak current mode control  
architecture with internal compensation to maintain  
stable operation with minimal output capacitance. The  
LMR36503 with the right resistor selection from the  
RT pin to ground can be externally programmed to  
any desired switching frequency of operation over a  
wide range from 200 kHz to 2.2 MHz. The precision  
EN/UVLO feature allows precise control of the device  
during the start-up and shutdown. The power-good  
flag, with built-in glitch filter and delayed release,  
offers a true indication of the system status,  
eliminating the requirement for an external supervisor.  
The compact solution size and rich feature set of  
LMR36503 simplifies implementation for a wide range  
of industrial applications.  
– Ultra-small, 2-mm × 2-mm HotRod™ package  
with wettable flanks  
High efficiency across load range with low power  
dissipation:  
– >90% peak efficiency at 1 MHz (5 VOUT  
adjustable)  
Ultra-low operating quiescent current at no load  
– 4 µA at 24 VIN to 3.3 VOUT (fixed output option)  
•
•
Device Information  
PART NUMBER  
PACKAGE(1)  
BODY SIZE (NOM)  
2 Applications  
LMR36503  
VQFN-HR (9)  
2.00 mm × 2.00 mm  
•
Factory automation: field transmitters and process  
sensors  
Building automation: HVAC and fire safety  
Appliances: garden and power tools  
(1) For all available packages, see the orderable addendum at  
the end of the data sheet.  
•
•
100  
90  
80  
70  
60  
50  
BOOT  
VIN  
CIN  
VIN  
CBOOT  
LIND  
EN/  
VOUT  
COUT  
SW  
UVLO  
RT  
40  
VCC  
PGOOD  
FB  
VIN = 12V  
VIN = 24V  
VIN = 36V  
VIN = 48V  
VIN = 54V  
30  
RFBT  
CVCC  
20  
RFBB  
10  
GND  
0
10m  
100m  
1m 10m  
Load Current (A)  
100m  
LMR3  
Efficiency versus Output Current VOUT = 5 V (Fix),  
1 MHz  
Simplified Schematic  
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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