EVALUATION KIT AVAILABLE MAX1674/MAX1675/MAX1676 High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters General Description Features The MAX1674/MAX1675/MAX1676 compact, high-effi- 94% Efficient at 200mA Output Current ciency, step-up DC-DC converters fit in small MAX 16A Quiescent Supply Current packages. They feature a built-in synchronous rectifier, which improves efficiency and reduces size and cost Internal Synchronous Rectifier (no external diode) by eliminating the need for an external Schottky diode. 0.1A Logic-Controlled Shutdown Quiescent supply current is only 16A. LBI/LBO Low-Battery Detector The input voltage ranges from 0.7V to V , where OUT V can be set from 2V to 5.5V. Start-up is guaran- OUT Selectable Current Limit for Reduced Ripple teed from 1.1V inputs. The MAX1674/MAX1675/ MAX1676 have a preset, pin-selectable output for 5V or Low-Noise, Anti-Ringing Feature (MAX1676) 3.3V. The outputs can also be adjusted to other volt- 8-Pin and 10-Pin MAX Packages ages using two external resistors. Preassembled Evaluation Kit (MAX1676EVKIT) All three devices have a 0.3 N-channel MOSFET power switch. The MAX1674 has a 1A current limit. The MAX1675 has a 0.5A current limit, which permits the use of a smaller inductor. The MAX1676 comes in a 10-pin MAX package and features an adjustable cur- rent limit and circuitry to reduce inductor ringing. Ordering Information PART TEMP. RANGE PIN-PACKAGE Applications MAX1674EUA -40C to +85C 8 MAX Pagers MAX1675EUA -40C to +85C 8 MAX Wireless Phones MAX1676EUB -40C to +85C 10 MAX Medical Devices Hand-Held Computers PDAs RF Tags Pin Configurations 1 to 3-Cell Hand-Held Devices Functional Diagrams TOP VIEW Typical Operating Circuit OUT FB 1 8 INPUT LBI 2 7 LX 0.7V TO V OUT MAX1674 MAX1675 LBO 3 6 GND REF 4 5 SHDN OUTPUT ON SHDN LX 3.3V, 5V, OR OFF ADJ (2V TO 5.5V) MAX UP TO 300mA MAX1674 OUT MAX1675 FB 1 10 OUT LBI 2 9 LX LOW-BATTERY LOW-BATTERY MAX1676 LBI LBO LBO 3 GND 8 DETECT IN DETECT OUT REF FB GND CLSEL 4 7 BATT REF 5 6 SHDN 0.1F Pin Configurations appear at end of data sheet. Functional Diagrams continued at end of data sheet. MAX UCSP is a trademark of Maxim Integrated Products, Inc. For pricing, delivery, and ordering information, please contact Maxim Direct 19-1360 Rev 3 3/00 at 1-888-629-4642, or visit Maxims website at www.maximintegrated.com. AVAILABLEMAX1674/MAX1675/MAX1676 High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters ABSOLUTE MAXIMUM RATINGS Supply Voltage (OUT to GND) ..............................-0.3V to +6.0V Continuous Power Dissipation (T = +70C) A Switch Voltage (LX to GND) .....................-0.3V to (V + 0.3V) 8-Pin MAX (derate 4.1mW/C above +70C) .............330mW OUT Battery Voltage (BATT to GND).............................-0.3V to +6.0V 10-Pin MAX (derate 5.6mW/C above +70C) ...........444mW Operating Temperature Range ...........................-40C to +85C SHDN, LBO to GND ..............................................-0.3V to +6.0V Junction Temperature......................................................+150C LBI, REF, FB, CLSEL to GND ...................-0.3V to (V + 0.3V) OUT Storage Temperature Range .............................-65C to +165C Switch Current (LX)...............................................-1.5A to +1.5A Lead Temperature (soldering, 10s) .................................+300C Output Current (OUT) ...........................................-1.5A to +1.5A Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V = 2V, FB = OUT (V = 3.3V), R = , T = 0C to +85C, unless otherwise noted. Typical values are at T = +25C.) BATT OUT L A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Minimum Input Voltage 0.7 V Operating Voltage V T = +25C 1.1 5.5 V IN A Start-Up Voltage T = +25C, R = 3k (Note 1) 0.9 1.1 V A L Start-Up Voltage Tempco -2 mV/C FB = OUT 3.17 3.30 3.43 Output Voltage V V OUT FB = GND 4.80 5 5.20 Output Voltage Range 2 5.5 V MAX1674, 300 420 MAX1676 (CLSEL = OUT) FB = OUT (V = 3.3V) OUT MAX1675, 150 220 MAX1676 (CLSEL = GND) Steady-State Output Current I mA OUT (Note 2) MAX1674, 180 285 MAX1676 (CLSEL = OUT) FB = GND (V = 5V) OUT MAX1675, 90 130 MAX1676 (CLSEL = GND) Reference Voltage V I =0 1.274 1.30 1.326 V REF REF Reference Voltage Tempco TEMPCO 0.024 mV/C Reference Voltage Load V I = 0 to 100A 315 mV REF LOAD REF Regulation Reference Voltage Line V V = 2V to 5.5V 0.08 2.5 mV/V REF LINE OUT Regulation FB, LBI Input Threshold 1.274 1.30 1.326 V Internal NFET, PFET R I = 100mA 0.3 0.6 DS(ON) LX On-Resistance MAX1674, MAX1676 (CLSEL = OUT) 0.80 1 1.20 LX Switch Current I A LIM Limit (NFET) MAX1675, MAX1676 (CLSEL = GND) 0.4 0.5 0.65 LX Leakage Current I V = 0, 5.5V V = 5.5V 0.05 1 A LEAK LX OUT 2 Maxim Integrated