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LT1612 Datasheet(PDF) 1 Page - Linear Technology |
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LT1612 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page 1 LT1612 sn1612 1612fs s Operates from Input Voltage As Low As 2V s Internal 0.7A Synchronous Switches s Uses Ceramic Input and Output Capacitors s 620mV Reference Voltage s 800kHz Fixed Frequency Switching s Programmable Burst Mode Operation s Low Quiescent Current: 160 µA s 8-Lead MSOP or SO Package The LT ®1612 is an 800kHz, synchronous step-down DC/ DC converter that operates from an input voltage as low as 2V. Internal 0.45 Ω switches deliver output currents up to 500mA, and the 800kHz switching frequency allows the use of small, low value ceramic input and output capaci- tors. Input voltage ranges from 5.5V down to 2V and output voltage can be set as low as the 620mV reference. The device features Burst Mode TM operation, keeping efficiency high at light loads. Burst Mode operation can be defeated by pulling the MODE pin high, enabling constant switching throughout the load range for low noise. No-load quiescent current is 160 µAandshutdowncurrent is less than 1 µA. The device is available in 8-lead SO and MSOP packages. s Portable Devices s Lithium-Ion Step-Down Converters s 5V to 3.3V Conversion s 2-Cell Alkaline Step-Down Converters Figure 1. 2V to 1.2V Converter Synchronous, Step-Down 800kHz PWM DC/DC Converter , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation. VIN 2V 0.1 µF 33.2k R2 232k 1% R1 215k 1% L1 10 µH 330pF C1 10 µF C2 68 µF 3.15V C1: TAIYO-YUDEN JMK325BJ106MN C2: PANASONIC EEFCDOF680R L1: SUMIDA CD43-100 1612 F01a VOUT 1.2V 500mA 100pF VIN SW FB BOOST MODE SHDN VC GND LT1612 LOAD CURRENT (mA) 90 80 70 60 50 40 30 100 10 500 1612 • F01b VIN = 2V (LINEAR) VIN = 3V (LINEAR) VIN = 2V VIN = 3V Efficiency for LT1612 vs Linear Regulator VOUT = 1.2V APPLICATIO S FEATURES DESCRIPTIO TYPICAL APPLICATION |
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