MAX1759 19-1600 Rev 1 6/00 Buck/Boost Regulating Charge Pump in MAX General Description Features The MAX1759 is a buck/boost regulating charge pump Regulated Output Voltage (Fixed 3.3V or that generates a regulated output voltage from a single Adjustable 2.5V to 5.5V) lithium-ion (Li+) cell, or two or three NiMH or alkaline 100mA Guaranteed Output Current cells for small hand-held portable equipment. The MAX1759 operates over a wide +1.6V to +5.5V input +1.6V to +5.5V Input Voltage Range voltage range and generates a fixed 3.3V or adjustable ) Low 50A Quiescent Supply Current (2.5V to 5.5V) output (Dual Mode . Maxims unique charge-pump architecture allows the input voltage to be 1A Shutdown Mode higher or lower than the regulated output voltage. Load Disconnected from Input in Shutdown Despite its high 1.5MHz operating frequency, the MAX1759 maintains low 50A quiescent supply current. High 1.5MHz Operating Frequency Designed to be an extremely compact buck/boost con- Uses Small Ceramic Capacitors verter, this device requires only three small ceramic capacitors to build a complete DC-DC converter capa- Short-Circuit Protection and Thermal Shutdown ble of generating a guaranteed 100mA (min) output Small 10-Pin MAX Package current from a +2.5V input. For added flexibility, the MAX1759 also includes an open-drain power-OK (POK) output that signals when the output voltage is in regulation. The MAX1759 is available in a space-saving 10-pin MAX package that is 1.09mm high and half the size of an 8-pin SO. Ordering Information Applications PART TEMP. RANGE PIN-PACKAGE Li+ Battery-Powered Applications MAX1759EUB -40C to +85C 10 MAX Miniature Equipment Backup Battery Boost Converters Translators Typical Operating Circuit Pin Configuration C X TOP VIEW IN OUT CXN CXP +1.6V TO +5.5V 3.3V AT 100mA IN OUT POK 1 10 FB C C OUT IN SHDN 2 9 OUT MAX1759 IN 3 8 CXP MAX1759 IN 4 7 CXN ON POK POWER OK SHDN OFF GND 5 6 PGND FB GND PGND MAX Dual Mode is a trademark of Maxim Integrated Products. Maxim Integrated Products 1 For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Buck/Boost Regulating Charge Pump in MAX ABSOLUTE MAXIMUM RATINGS IN, OUT, FB, POK, SHDN to GND............................-0.3V to +6V Operating Temperature Range .......................... -40C to +85C Junction Temperature......................................................+150C PGND to GND.....................................................................0.3V CXN to GND ................................................-0.3V to (V + 0.3V) Storage Temperature Range .............................-65C to +150C IN Lead Temperature (soldering, 10s) ................................ +300C CXP to GND................-0.3V to (the greater of V or V ) + 1V IN OUT OUT Short to GND.........................................................Indefinite Continuous Power Dissipation (T = +70C) A 10-Pin MAX (derate 5.6mW/C above +70C) .........444mW 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 (Circuit of Figure 1, V = V = 2V, FB = PGND = GND, C = 10F, C = 0.33F, C = 10F, T = 0C to +85C, unless oth- IN SHDN IN X OUT A erwise noted. Typical values are at T = +25C.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Voltage Range V 1.6 5.5 V IN Input Undervoltage Lockout V 0.6 1.0 1.4 V UVLO Voltage Output Voltage Adjustment Range 1.6V V 5.5V 2.5 5.5 V IN 2V V 5.5V, 1mA I 50mA 3.17 3.3 3.43 V IN LOAD Output Voltage V OUT 2.5V V 5.5V, 1mA I 100mA 3.17 3.3 3.43 IN LOAD Maximum Output Current I 2.5V V 5.5V 100 mA LOAD,MAX IN Transient Load Current I 100mA (RMS) 200 mA LOAD V = V = 4V, V = 0, stepping down 50 90 FB IN SHDN Quiescent Supply Current I A Q V = V = 2V, V = 0, stepping up 85 180 IN SHDN FB Shutdown Supply Current I 1.6V V 5.5V, V = 0 15 A Q,SHDN IN SHDN Leakage Current into OUT in V = 2V, V = 3.3V, V = 0 15 A IN OUT SHDN Shutdown V 1.6V V 5.5V 0.25 V IL IN IN SHDN Logic Input Voltage V V 1.6V V 5.5V 0.7 V IH IN IN I V = 5.5V -1 1 A SHDN Input Leakage Current SHDN SHDN FB Regulation Voltage V V = 1.65V, V = 3.3V 1.205 1.235 1.265 V FB IN OUT FB Input Current V = 1.27V 25 200 nA FB Internal feedback 100 50 mV FB Dual-Mode Threshold External feedback 200 100 mV POK Trip Voltage Falling edge at FB 1.0 1.1 1.2 V POK Output Low Voltage V I = 0.5mA, V = 2V 5100 mV OL SINK IN POK Leakage Current V = 5.5V, V = 1.27V 0.01 0.2 A POK FB Switching Frequency f 1.6V V 5.5V, V = 1V 1.2 1.5 1.8 MHz OSC IN FB Output Short-Circuit Current V = 0, 2.5V V 5.5V, foldback current limit 110 mA OUT IN Thermal Shutdown Temperature Rising temperature 160 C 20 Thermal Shutdown Hysteresis C Efficiency V = 3.6V, I = 10mA 90 % IN LOAD 2 MAX1759