MAX8667/MAX8668 19-0784 Rev 1 7/07 1.5MHz Dual Step-Down DC-DC Converters with Dual LDOs and Individual Enables General Description Features Tiny, Thin QFN 3mm x 3mm Package The MAX8667/MAX8668 dual step-down converters with dual low-dropout (LDO) linear regulators are Individual Enables intended to power low-voltage microprocessors or Step-Down Converters DSPs in portable devices. They feature high efficiency 600mA Guaranteed Output Current on OUT1 with small external component size. The step-down 1200mA Guaranteed Output Current on OUT2 converters are adjustable from 0.6V to 3.3V (MAX8668) Tiny Size 2.2H Chip Inductor (0805) or factory preset (MAX8667) with guaranteed output Output Voltage from 0.6V to 3.3V (MAX8668) current of 600mA for OUT1 and 1200mA for OUT2. The Ultra-Fast Line and Load Transients 1.5MHz hysteretic-PWM control scheme allows for tiny Low 25A Supply Current Each external components and reduces no-load operating LDOs current to 100A with all outputs enabled. Dual low-qui- 300mA Guaranteed escent-current, low-noise LDOs operate down to 1.7V Low 1.7V Minimum Supply Voltage supply voltage. The MAX8667/MAX8668 have individ- Low Output Noise ual enables for each output, maximizing flexibility. Ordering Information The MAX8667/MAX8668 are available in the space- saving, 3mm x 3mm, 16-pin thin QFN package. PART PKG CODE TOP MARK MAX8667ETEAA+ T1633-4 AEQ Applications MAX8667ETEAB+ T1633-4 AFI Cell Phones/Smartphones MAX8667ETEAC+ T1633-4 AFM PDA and Palmtop Computers MAX8667ETECQ+ T1633-4 AFN Portable MP3 and DVD Players Note: All MAX8667/MAX8668 parts are in a 16-pin, thin QFN, 3mm x 3mm package and operate in the -40C to +85C Digital Cameras, Camcorders extended temperature range. PCMCIA Cards +Denotes a lead-free package. Handheld Instruments Ordering Information continued at the end of data sheet. Selector Guide appears at the end of data sheet. Typical Operating Circuit Pin Configuration 2.6V TO 5.5V TOP VIEW 10F 4.7F IN12 IN34 12 11 10 9 EN3 EN1 EN4 EN2 300mA 13 OUT2 (FB2) PGND1 8 REF OUT3 REF 300mA 14 7 0.01F OUT1 (FB1) OUT4 GND MAX8667 4.7F 4.7F 6 GND EN1 15 MAX8668 EN2 16 5 EN4 MAX8667 2.2H 600mA 2.2H 1.2A 132 4 LX2 LX1 OUT1 OUT2 2.2F 2.2F PGND1 PGND2 THIN QFN (3mm x 3mm) ( ) ARE FOR THE MAX8668 Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLE EN3 LX1 OUT3 IN12 IN34 LX2 OUT4 PGND21.5MHz Dual Step-Down DC-DC Converters with Dual LDOs and Individual Enables ABSOLUTE MAXIMUM RATINGS IN12, IN34, FB1, FB2, EN1, EN2, EN3, EN4, OUT1, Continuous Power Dissipation (T = +70C) A OUT2, REF to GND............................................-0.3V to +6.0V 16-Pin, 3mm x 3mm Thin QFN OUT3, (derate 20.8mW/C above +70C).............................1667mW OUT4 to GND.....-0.3V to the lesser of + 6V or (V + 0.3V) Operating Temperature Range ...........................-40C to +85C IN34 PGND1, PGND2 to GND .......................................-0.3V to +0.3V Junction Temperature..................................................... +150C LX1, LX2 Current ..........................................................1.5A RMS Storage Temperature Range .............................-65C to +150C LX1, LX2 to GND (Note 1).......................-0.3V to (V + 0.3V) Lead Temperature (soldering, 10s) .................................+300C IN12 Note 1: LX has internal clamp diodes to GND and IN12. Applications that forward bias these diodes should take care not to exceed the ICs package-dissipation limits. 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 = V = 3.6V, T = -40C to +85C, unless otherwise noted. Typical values are at T = +25C.) (Note 1) IN34 IN12 A A PARAMETER CONDITIONS MIN TYP MAX UNITS IN34 Supply Range V V 1.7 5.5 V IN12 IN34 IN12 Supply Range MAX8668, V V 2.6 5.5 V IN12 IN34 IN12 Suppy Range MAX8667, V V 2.8 5.5 V IN12 IN34 T = +25C 1 A Shutdown Supply Current, A V = V = 4.2V V = 0V IN12 IN34 EN I + I IN12 IN34 T = +85C 0.05 A A No Load Supply Current, MAX8667ETEJS+, all regulators enabled 100 150 A I + I IN12 IN34 UNDERVOLTAGE LOCKOUT V rising 2.4 2.5 2.6 V IN12 IN12 UVLO V hysteresis 0.1 V IN12 V rising 1.5 1.6 1.7 V IN34 IN34 UVLO V hysteresis 0.1 V IN34 THERMAL SHUTDOWN Threshold T rising +160 C A Hysteresis 15 C REFERENCE Reference Bypass Output 0.591 0.600 0.609 V Voltage REF Supply Rejection 2.6V (V = V ) 5.5V 0.15 mV/V IN12 IN34 LOGIC AND CONTROL INPUTS 1.7V V 5.5V IN34 EN Input Low Level 0.4 V 2.6V V 5.5V IN12 1.7V V 5.5V IN34 EN Input High Level 1.44 V 2.6V V 5.5V IN12 T = +25C -1 +1 A EN Input Leakage Current V = V = 5.5V A IN12 IN34 T = +85C 0.001 A STEP-DOWN CONVERTERS Minimum Adjustable Output MAX8668 0.6 V Voltage 2 MAX8667/MAX8668