MAX8570MAX8575 19-3329 Rev 3 3/10 High-Efficiency LCD Boost with True Shutdown General Description Features The MAX8570 family of LCD step-up converters uses 15V or Adjustable Output Voltage Up to 28V an internal n-channel switch and an internal p-channel Safety Features Protect Against Output Faults output isolation switch. These converters operate from a 2.7V to 5.5V supply voltage and deliver up to 28V at 20mA at 20V from a Single Li+ Battery the output. True Shutdown A unique control scheme provides the highest efficien- 87% Efficiency cy over a wide range of load conditions. The internal MOSFET switch reduces external component count and Up to 800kHz Switching Frequency a high switching frequency (up to 800kHz) allows for Small, 6-Pin SOT23 and DFN (MAX8570 Only) tiny surface-mount components. Three current-limit Packages options are available. The MAX8570 and MAX8572 use a 110mA current limit to reduce ripple and component Ordering Information size in low-current applications. For high-power require- ments, the MAX8574 and MAX8575 use a 500mA cur- PIN- TOP rent limit and supply up to 20mA at 20V. The MAX8571 PART TEMP RANGE PACKAGE MARK and MAX8573 use a 250mA current limit for a compro- mise between ripple and power. Built-in safety features MAX8570ELT+T -40C to +85C 6L DFN ACW protect the internal switch and down-stream compo- MAX8570EUT+T -40C to +85C 6 SOT23 ABTJ nents from fault conditions. MAX8571EUT+T -40C to +85C 6 SOT23 ABTK Additional features include a low quiescent current and a True Shutdown mode to save power. The MAX8570/ MAX8572EUT+T -40C to +85C 6 SOT23 ABTL MAX8571/MAX8574 allow the user to set the output MAX8573EUT+T -40C to +85C 6 SOT23 ABTM voltage between 3V and 28V, and the MAX8572/ MAX8574EUT+T -40C to +85C 6 SOT23 ABTN MAX8573/MAX8575 have a preset 15V output. These step-up converters are ideal for small LCD panels with MAX8575EUT+T -40C to +85C 6 SOT23 ABTO low current requirements, but can also be used in other +Denotes a lead(Pb)-free RoHS-compliant package. applications. The MAX8571 evaluation kit is available to T = Tape and reel. help reduce design time. Selector Guide Applications LCD Bias Generators PART CURRENT LIMIT OUTPUT VOLTAGE Polymer LEDs (OLED) MAX8570 110mA Adjustable MAX8571 250mA Adjustable Cellular or Cordless Phones MAX8572 110mA 15V Palmtop Computers MAX8573 250mA 15V Personal Digital Assistants (PDAs) MAX8574 500mA Adjustable Organizers MAX8575 500mA 15V Handy Terminals Pin Configurations Typical Operating Circuit TOP VIEW V = V TO 28V OUT CC + LX SW FB 1 6V CC MAX8572 MAX8570 GND 2 5SW MAX8571 MAX8573 V = 2.7V TO 5.5V CC MAX8574 OUT V MAX8575 CC SHDN34 LX SOT23 ON Pin Configurations continued at end of data sheet. SHDN GND OFF True Shutdown is a trademark of Maxim Integrated Products, Inc. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com EVALUATION KIT AVAILABLEHigh-Efficiency LCD Boost with True Shutdown ABSOLUTE MAXIMUM RATINGS V , SHDN to GND..................................................-0.3V to +6V Continuous Power Dissipation (T = +70C) CC A DFN (derate 4.5mW/C above +70C)....................357.8mW SW to GND .................................................-0.3V to (V + 0.3V) CC FB to GND (MAX8570/MAX8571/ SOT23-6 (derate 8.7mW/C above +70C)...............695.7mW Operating Temperature Range ...........................-40C to +85C MAX8574)...............................................-0.3V to (V + 0.3V) CC Junction Temperature......................................................+150C OUT to GND (MAX8572/MAX8573/MAX8575).......-0.3V to +30V LX to GND ..............................................................-0.3V to +30V Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C I , I ..............................................................................600mA LX CC Soldering Temperature (reflow) .......................................+260C 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, SW open, V = 1.3V (MAX8570/MAX8571/MAX8574) or V = 16V (MAX8572/MAX8573/MAX8575), T = CC SHDN FB OUT A -40C to +85C, unless otherwise noted. Typical values are at T = +25C.) (Note 1) A PARAMETER CONDITIONS MIN TYP MAX UNITS V Input Voltage Range 2.70 5.50 V CC V Undervoltage Lockout V rising, 50mV typical hysteresis 2.33 2.5 2.65 V CC CC V Supply Current 25 35 A CC T = +25C 0.05 1 A V Shutdown Current SHDN = GND, V = 5.5V A CC CC T = -40C to +85C 0.05 A Circuit of Figure 3, V = 15V, I = 5mA, OUT LOAD Line Regulation 0.1 %/V V = 2.7V to 5.5V CC Load Regulation Circuit of Figure 3, V = 15V, I = 0 to 5mA 0.1 %/mA OUT LOAD T = 0C to +85C 1.216 1.226 1.236 A FB Regulation Voltage V T = -40C to +85C 1.2137 1.2383 A FB Input Bias Current -50 -4 +50 nA T = 0C to +85C 14.85 15 15.15 A OUT Regulation Voltage V T = -40C to +85C 14.813 15.187 A OUT Input Bias Current V = 15V 2.4 4.4 A OUT LX Voltage Range 28 V MAX8571/MAX8573 0.217 0.241 0.267 LX Switch Current Limit (Note 2) MAX8570/MAX8572 0.088 0.101 0.108 A MAX8574/MAX8575 0.425 0.484 0.540 MAX8571/MAX8573/MAX8574/MAX8575, I = 100mA 0.9 1.5 LX LX On-Resistance MAX8570/MAX8572, I = 50mA 1.5 2.4 LX T = +25C 0.01 2 A LX Leakage Current V = 28V A LX T = -40C to +85C 0.05 A Maximum LX On-Time 811 14 s V > 1V or V > 12.2V 0.8 1 1.2 FB OUT Minimum LX Off-Time s V = 0.25V or V = 3.4V 4.0 5 6.0 FB OUT Current-Limit Propagation Delay 55 ns SHDN Low Level (V ) 2.7V V 5.5V 0.7 V IL CC 4.2V V 5.5V 1.5 CC SHDN High Level (V ) V IH 2.7V V < 4.2V 1.4 CC SHDN Leakage Current -1 +1 A 2 MAX8570MAX8575