LT1610 1.7MHz, Single Cell Micropower DC/DC Converter FEATURES DESCRIPTIO n Uses Tiny Capacitors and Inductor The LT 1610 is a micropower fixed frequency DC/DC n Internally Compensated converter that operates from an input voltage as low as 1V. n Low Quiescent Current: 30m A Intended for small, low power applications, it switches at n Operates with V as Low as 1V 1.7MHz, allowing the use of tiny capacitors and inductors. IN n 3V at 30mA from a Single Cell The device can generate 3V at 30mA from a single cell n 5V at 200mA from 3.3V (1V) supply. An internal compensation network can be n High Output Voltage Capability: Up to 28V connected to the LT1610s V pin, eliminating two exter- C n Low Shutdown Current: <1m A nal components. No-load quiescent current of the LT1610 TM n Automatic Burst Mode Switching at Light Load is 30m A, and the internal NPN power switch handles a n Low V Switch: 300mV at 300mA CESAT 300mA current with a voltage drop of 300mV. n 8-Lead MSOP and SO Packages The LT1610 is available in 8-lead MSOP and SO packages. U APPLICATIO S n Pagers n Cordless Phones n Battery Backup n LCD Bias , LTC and LT are registered trademarks of Linear Technology Corporation. n Burst Mode is a trademark of Linear Technology Corporation. Portable Electronic Equipment TYPICAL APPLICATIO L1 Efficiency D1 4.7m H V OUT 3V 85 30mA V = 3V OUT R1 65 80 V = 1.5V 1M IN V SW V = 1.25V IN IN 2 3 75 FB SHDN + + R2 C1 C2 LT1610 70 1 CELL 681k V = 1V 22m F 22m F IN 8 7 COMP GND 65 V C PGND 60 1 4 55 C1, C2: AVX TAJA226M006R 1610 F01 50 D1: MOTOROLA MBR0520 0.1 1 10 100 L1: MURATA LQH1C4R7 LOAD CURRENT (mA) 1610 TA01 Figure 1. 1-Cell to 3V Step-Up Converter 1 EFFICIENCY (%) U ULT1610 ABSOLUTE MAXIMUM RATINGS (Note 1) V Voltage ................................................................ 8V Maximum Junction Temperature ......................... 125 C IN Operating Temperature Range (Note 1) SW Voltage ............................................... 0.4V to 30V FB Voltage ..................................................... V + 0.3V Commercial ............................................. 0 C to 70 C IN Extended Commercial (Note 2).......... 40 C to 85 C V Voltage ................................................................ 2V C COMP Voltage .......................................................... 2V Industrial ........................................... 40 C to 85 C Storage Temperature Range ................. 65 C to 150 C Current into FB Pin .............................................. 1mA SHDN Voltage ............................................................ 8V Lead Temperature (Soldering, 10 sec).................. 300 C PACKAGE/ORDER INFORMATION ORDER PART ORDER PART TOP VIEW NUMBER NUMBER TOP VIEW V 1 8 COMP C V 1 8 COMP C LT1610CMS8 LT1610CS8 7 GND FB 2 GND FB 2 7 SHDN 3 6 V IN LT1610IS8 SHDN 3 6 V IN PGND 4 5 SW PGND SW 4 5 MS8 PACKAGE MS8 PART MARKING S8 PART MARKING 8-LEAD PLASTIC MSOP S8 PACKAGE T = 125 C, q = 160 C/W JMAX JA 8-LEAD PLASTIC SO LTDT 1610 T = 125 C, q = 120 C/W JMAX JA 1610I Consult factory for Military grade parts. ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the specified temperature range, otherwise specifications are at T = 25 C. Commercial grade 0 C to 70 C, V = 1.5V, V = V , unless otherwise noted. A IN SHDN IN (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum Operating Voltage 0.9 1 V Maximum Operating Voltage 8V Feedback Voltage l 1.20 1.23 1.26 V Quiescent Current V = 1.5V, Not Switching 30 60 m A SHDN Quiescent Current in Shutdown V = 0V, V = 2V 0.01 0.5 m A SHDN IN V = 0V, V = 5V 0.01 1.0 m A SHDN IN FB Pin Bias Current l 27 80 nA Reference Line Regulation 1V V 2V (25 C, 0 C) 0.6 1 %/V IN 1V V 2V (70 C) 2 %/V IN 2V V 8V (25 C, 0 C) 0.03 0.15 %/V IN 2V V 8V (70 C) 0.2 %/V IN Error Amp Transconductance D I = 2mA25 m mhos Error Amp Voltage Gain 100 V/V Switching Frequency l 1.4 1.7 2 MHz Maximum Duty Cycle 77 80 95 % l 75 95 % 2 U W U U WWW