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| 19-1920; Rev 1; 7/01 MAX1833 Evaluation Kit General Description 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. o Reverse-Battery Protection o 1.5V to VOUT Input Supply Voltage o 3.3V Output Voltage (MAX1833/MAX1835) o Adjustable Output Voltage (MAX1832/MAX1834, 2V to 5.5V) o Up to 150mA Output Current o No External Schottky Diode Required o Synchronous Rectification for Improved Efficiency o 1A IC Shutdown Current o RST Output (MAX1833/MAX1835) o 6-Pin SOT23 Package o Surface-Mount Construction o Fully Assembled and Tested Features Evaluates: MAX1832-MAX1835 Component List DESIGNATION QTY DESCRIPTION 10F, 6.3V X5R ceramic capacitors (1206) Taiyo Yuden JMK325BJ106MN or TDK C3225X5R1A106M 0.01F ceramic capacitor (0805) 3-pin header 10H power inductor Sumida CDRH5D18-100 309k 1% resistor (0805) Not installed (0805) 1M 5% resistor (0805) 220k 5% resistor (0805) MAX1833EUT (6-pin SOT23) Shunt MAX1833 PC board MAX1832-MAX1835 data sheet MAX1833EVKIT data sheet SUPPLIER Sumida Taiyo Yuden TDK PART MAX1832EUT MAX1833EUT MAX1834EUT MAX1835EUT PART MAX1833EVKIT Ordering Information TEMP. RANGE 0C to +70C IC PACKAGE 6 SOT23 C1, C2 2 Note: To evaluate the MAX1832/MAX1834/MAX1835, request a MAX1832EUT-T/MAX1834EUT-T/MAX1835EUT-T free sample with the MAX1833EVKIT. C3 JU1 L1 R1 R2 R3 R4 U1 None None None None 1 1 1 1 0 1 1 1 1 1 1 1 Selector Guide OUTPUT VOLTAGE Adjustable Fixed 3.3V Adjustable Fixed 3.3V VOUT IN SHUTDOWN VBATT VBATT VBATT - 0.7V VBATT - 0.7V Component Suppliers 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 1 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. MAX1833 Evaluation Kit Evaluates: MAX1832-MAX1835 Quick Start 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. 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. 2 and 3 Table 1. Jumper JU1 Functions SHUNT LOCATION SHDN PIN Connected to VOUT MAX1833 OUTPUT MAX1833 enabled, VOUT = 3.3V Shutdown mode, VOUT = VBATT 1 and 2 Connected to GND 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 100k to 1M 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. Detailed Description Shutdown Jumper Selection The MAX1833 EV kit features a shutdown mode that reduces quiescent current to <1A 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. VBATT 1.5V TO 3.3V 2 VOUT R4 220k BATT LX OUT 4 5 R1 309k 1% RST (FB) 6 C1 10F 6.3V L1 10H C2 10F 6.3V U1 MAX1832 1 SHDN MAX1833 MAX1834 C3 MAX1835 0.01F GND 3 VOUT 3.3V SHDN 1 2 3 JU1 R3 1M RST R2 OPEN GND ( ) ARE FOR MAX1832/MAX1834 ONLY. Figure 1. MAX1833 EV Kit Schematic 2 _______________________________________________________________________________________ MAX1833 Evaluation Kit Evaluates: MAX1832-MAX1835 ACTUAL BOARD SIZE: 1.9in 1.9in ACTUAL BOARD SIZE: 1.9in 1.9in 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 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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