19-1920; Rev 1; 7/01 MAX1833 Evaluation Kit The MAX1833 evaluation kit (EV kit) evaluates the MAX1833 high-efficiency, step-up DC-DC converter for portable hand-held devices. The EV kit accepts a positive input voltage between 1.5V to VOUT and converts it to a 3.3V output for currents up to 150mA. The EV kit provides ultra-low quiescent current and high efficiency for maximum battery life. The MAX1833 EV kit is a fully assembled and tested surface-mount printed circuit board. It can also be used to evaluate the MAX1832/MAX1834/MAX1835 for other output voltages in the 2V to 5.5V range. Additional pads on the board accommodate the external feedback resistors for setting different output voltages. Features ♦ Reverse-Battery Protection ♦ 1.5V to VOUT Input Supply Voltage ♦ 3.3V Output Voltage (MAX1833/MAX1835) ♦ Adjustable Output Voltage (MAX1832/MAX1834, 2V to 5.5V) ♦ Up to 150mA Output Current ♦ No External Schottky Diode Required ♦ Synchronous Rectification for Improved Efficiency ♦ 1µA IC Shutdown Current ♦ RST Output (MAX1833/MAX1835) ♦ 6-Pin SOT23 Package ♦ Surface-Mount Construction ♦ Fully Assembled and Tested Component List DESIGNATION QTY DESCRIPTION Ordering Information PART TEMP. RANGE MAX1833EVKIT 0°C to +70°C IC PACKAGE 6 SOT23 C1, C2 2 10µF, 6.3V X5R ceramic capacitors (1206) Taiyo Yuden JMK325BJ106MN or TDK C3225X5R1A106M C3 1 0.01µF ceramic capacitor (0805) JU1 1 3-pin header PART L1 1 10µH power inductor Sumida CDRH5D18-100 OUTPUT VOLTAGE MAX1832EUT Adjustable VBATT R1 1 309kΩ ±1% resistor (0805) MAX1833EUT Fixed 3.3V VBATT R2 0 Not installed (0805) MAX1834EUT Adjustable VBATT - 0.7V R3 1 1MΩ ±5% resistor (0805) MAX1835EUT Fixed 3.3V VBATT - 0.7V R4 1 220kΩ ±5% resistor (0805) U1 1 MAX1833EUT (6-pin SOT23) None 1 Shunt None 1 MAX1833 PC board None 1 MAX1832−MAX1835 data sheet None 1 MAX1833EVKIT data sheet Note: To evaluate the MAX1832/MAX1834/MAX1835, request a MAX1832EUT-T/MAX1834EUT-T/MAX1835EUT-T free sample with the MAX1833EVKIT. Selector Guide VOUT IN SHUTDOWN Component Suppliers SUPPLIER Sumida Taiyo Yuden TDK PHONE 847-956-0666 408-573-4150 847-390-4373 FAX 847-956-0702 408-573-4159 847-390-4428 Note: Please indicate that you are using the MAX1832, MAX1833, MAX1834, or MAX1835 when contacting these component suppliers ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 Evaluates: MAX1832–MAX1835 General Description Evaluates: MAX1832–MAX1835 MAX1833 Evaluation Kit Quick Start Table 1. Jumper JU1 Functions The MAX1833 EV kit is a fully assembled and tested surface-mount board. Follow the steps below to verify board operation. Do not turn on the power supply until all connections are completed: 1) Connect a voltmeter and load (if any) to the VOUT pad. SHDN PIN MAX1833 OUTPUT 1 and 2 Connected to VOUT MAX1833 enabled, VOUT = 3.3V 2 and 3 Connected to GND Shutdown mode, VOUT = VBATT SHUNT LOCATION 2) Verify that the shunt is across JU1 pins 1 and 2. 3) Connect the input supply (1.5V to 3.3V) to the pads marked VBATT and GND. 4) Turn on the power and verify that the output voltage is 3.3V. 5) Refer to the Setting the Output Voltage section in the MAX1832–MAX1835 data sheet to modify the board for a different output voltage. Detailed Description Shutdown Jumper Selection The MAX1833 EV kit features a shutdown mode that reduces quiescent current to <1µA to preserve battery life. In shutdown, the MAX1833 (and MAX1832) output connects to the battery input voltage through the inductor and the internal synchronous rectifier PFET. Evaluating Other Output Voltages (MAX1832/MAX1834) The MAX1833EVKIT output is set to +3.3V. However, the MAX1832/MAX1834 can be used to evaluate other output voltages in the +2V to +5.5V range. Replace the MAX1833 device with a MAX1832 or MAX1834, and select feedback resistors R1 and R2 values. Select feedback resistor R2 in the 100kΩ to 1MΩ range. R1 is then given by: R1 = R2 ((VOUT / VFB) - 1) where VFB = 1.228V. Care must be taken when installing the IC. Refer to the MAX1832–MAX1835 data sheet for soldering instructions and limitations. VBATT 1.5V TO 3.3V L1 10µH 2 VOUT SHDN 1 2 BATT R4 220kΩ JU1 3 R3 1MΩ LX C2 10µF 6.3V 4 U1 MAX1832 1 SHDN MAX1833 MAX1834 C3 MAX1835 0.01µF GND 3 OUT 5 R1 309kΩ 1% RST (FB) C1 10µF 6.3V 6 RST R2 OPEN ( ) ARE FOR MAX1832/MAX1834 ONLY. Figure 1. MAX1833 EV Kit Schematic 2 VOUT 3.3V _______________________________________________________________________________________ GND MAX1833 Evaluation Kit Figure 2. MAX1833 EV Kit Component Placement Guide— Component Side Figure 3. MAX1833 EV Kit PC Board Layout—Component Side ACTUAL BOARD SIZE: 1.9in ✕ 1.9in Figure 4. MAX1833 EV Kit PC Board Layout—Solder Side Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 3 © 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. Evaluates: MAX1832–MAX1835 ACTUAL BOARD SIZE: 1.9in ✕ 1.9in ACTUAL BOARD SIZE: 1.9in ✕ 1.9in