EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX1832MAX1835 High-Efficiency Step-Up Converters with Reverse Battery Protection General Description Features The MAX1832MAX1835 are high-efficiency step-up Reverse Battery Protection for DC-DC Converter converters with complete reverse battery protection that and Load protects the device and the load when the battery Up to 90% Efficiency is reversed. They feature a built-in synchronous No External Diode or FETs Needed rectifier, which allows for over 90% efficiency and reduces Internal Synchronous Rectifier size and cost by eliminating the need for an external 4A Quiescent Current Schottky diode. <1A Shutdown Supply Current These step-up converters operate from a +1.5V to +5.5V +1.5V to +5.5V Input Voltage Range input voltage range and deliver up to 150mA of load cur- Accurate SHDN Threshold for Low-Battery Cutoff rent. The MAX1833EUT/MAX1835EUT (SOT devices) BATT Connected to OUT in Shutdown for Backup have a fixed 3.3V output voltage. The MAX1833ETT30 (TDFN device) has a fixed 3.0V output voltage. The Power (MAX1832/MAX1833) MAX1832/MAX1834 have adjustable outputs from +2V RST Output (MAX1833/MAX1835) to +5.5V. In shutdown, the MAX1832/MAX1833 connect Fixed 3.3V/3.0V Output Voltage the battery input to the voltage output, allowing the input Adjustable Output Voltage (MAX1832/MAX1834) battery to be used as a backup or real-time clock supply Up to 150mA Output Current when the converter is off (see Selector Guide). Tiny 6-Pin SOT23 Package MAX183 EUT devices are available in a miniature 6-pin Tiny 6-Pin Thin QFN Package (MAX1833ETT30) SOT23 package. The MAX1833ETT30 is available in a 3mm x 3mm thin DFN package. The MAX1832EVKIT is Ordering Information available to speed designs. PIN- TOP PART TEMP RANGE Applications PACKAGE MARK Medical Diagnostic Equipment MAX1832EUT+T -40C to +85C 6 SOT23-6 AAOT Pagers MAX1833EUT+T -40C to +85C 6 SOT23-6 AAOU Hand-Held Instruments 6 TDFN-6 Remote Wireless Transmitters MAX1833ETT30+T -40C to +85C ABX (T633-1) Digital Cameras Cordless Phones MAX1834EUT+T -40C to +85C 6 SOT23-6 AAOV Battery Backup MAX1835EUT+T -40C to +85C 6 SOT23-6 AAOW PC Cards Local 3.3V or 5V Supply Selector Guide Pin Configurations OUTPUT OUTPUT VOLTAGE PART VOLTAGE IN SHUTDOWN TOP VIEW MAX1832EUT+T Adjustable V BATT 6 4 5 MAX1833EUT+T Fixed 3.3V V BATT SHDN 1 6 FB (RST) MAX1832 MAX1833ETT30+T Fixed 3.0V V BATT MAX1834 (MAX1833EUT) MAX1833ETT BATT 2 5 OUT MAX1834EUT+T Adjustable V - 0.7V BATT (MAX1835) MAX1835EUT+T Fixed 3.3V V - 0.7V BATT GND 3 4 LX 1 2 3 SOT23 TDFN (3mm x 3mm) 19-1802 Rev 3 9/18 SHDN RST BATT OUT GND LXMAX1832MAX1835 High-Efficiency Step-Up Converters with Reverse Battery Protection Absolute Maximum Ratings BATT, LX to GND .......................................................-6V to +6V Operating Temperature Range ........................... -40C to +85C LX to OUT ..................................................................-6V to +1V Junction Temperature ......................................................+150C SHDN to GND ...........................................-6V to (V + 0.3V) Storage Temperature Range ............................ -65C to +150C OUT OUT, FB, RST TO GND ..........................................-0.3V to +6V Lead Temperature (soldering, 10s) .................................+300C LX Current ...............................................................................1A Continuous Power Dissipation (T = +70C) A 6-Pin SOT23 (derate 9.1mW/C above +70C) ..........727mW 6-Pin 3mm x 3mm TDFN (derate 18.2mW/C above +70C) .........................................................1454.5mW 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 = +1.5V, V = +3.3V, V = +2V, GND = 0, T = -40C to +85C. Typical values are at T = +25C, unless otherwise SHDN OUT BATT A A noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Range V MAX1832/MAX1834 2.0 5.5 V OUT Battery Input Range V 1.5 5.5 V BATT T = +25C 1.22 1.5 A Startup Battery Input Voltage V R = 2.6k V SU LOAD T = -40C to +85C 1.24 A T = +25C 3.225 3.290 3.355 MAX1833EUT/ A MAX1835EUT T = -40C to +85C 3.208 3.372 A Output Voltage V V OUT T = +25C 2.94 3.0 3.06 A MAX1833ETT30 T = -40C to +85C 2.925 3.075 A T = +25C 1.208 1.228 1.248 MAX1832/ A FB Trip Voltage V V FB MAX1834 T = -40C to +85C 1.204 1.252 A MAX1832/ T = +25C 3.5 20 A FB Input Bias Current I MAX1834, nA FB T = -40C to +85C 4.0 V = +1.3V A FB T = +25C 0.4 1.2 V = +3.3V A OUT N-Channel On-Resistance R NCH I = 100mA T = -40C to +85C 1.5 LX A T = +25C 0.5 1.3 V = +3.3V A OUT P-Channel On-Resistance R PCH I = 100mA LX T = -40C to +85C 1.6 A I = 100mA, PCH off, V = +3.5V, LX OUT P-Channel Catch-Diode Voltage 0.73 V V = +1.3V FB T = +25C 435 525 615 A N-Channel Switch Current Limit I V = +3.3V mA MAX OUT T = -40C to +85C 400 650 A Switch Maximum On-Time t 3.5 5 6.5 s ON T = +25C 2 17 34 Synchronous Rectifier A V = +3.3V mA OUT Zero-Crossing Current T = -40C to +85C 0 39 A T = +25C 2.5 7.0 Quiescent Current into OUT V = +3.5V, A OUT A (Note 2) V = +1.3V FB T = -40C to +85C 8.0 A Shutdown Current into OUT V = +3.5V, V = V = 0V 0.05 1 A OUT SHDN FB Maxim Integrated 2 www.maximintegrated.com