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19-4771; Rev 1; 10/98
MAX769 Evaluation Kit
General Description
The MAX769 evaluation kit (EV kit) provides a platform for evaluating the features of the MAX769. The MAX769 converts a 2-cell or 3-cell, 1.5V to 5.5V battery voltage to four separate output voltages. The main output voltage at OUT is digitally controlled from 1.8V to 4.9V in 100mV steps by a 3-wire SPITM serial interface. OUT provides up to 80mA. The other outputs (REG1, REG2, and REG3) are low-noise linear-regulator outputs. The MAX769 contains numerous other features for two-way paging and other low-power wireless designs. Consult the MAX769 data sheet for details. The MAX769 EV kit is a fully assembled and tested surface-mount circuit board. The MAX847 is similar to the MAX769 except that it contains a boost DC-DC converter (for 1-cell inputs) rather than a buck-boost converter (for 2-cell or 3-cell inputs). To evaluate the MAX847, please order the MAX847EVKIT.
Features
o 1.5V to 5.5V (buck-boost) Input Voltage o 1.8V to 4.9V Digitally Adjustable Output Voltage o Up to 80mA Total Output Current o Three Low-Noise Voltage Regulators o Charger for Small NiCd, NiMH, Lithium Battery, or Storage Capacitor o 270kHz Switching Frequency o 15A Idle ModeTM Current o Digitally Controlled 1.8 Switches for Vibrators, Beepers, and Other Low-Power Wireless Designs o Reset and Low-Battery Outputs o Surface-Mount Components o Fully Assembled and Tested
Evaluates: MAX769
Ordering Information
PART MAX769EVKIT TEMP. RANGE 0C to +70C IC PACKAGE 28 QSOP
Component List
DESIGNATION QTY C1, C2 C3, C8, C10, C12, C13, C15, C16 C4 C5, C9, C14 C6, C7 C11 D1 R1 R2, R3, R6, R8, R11, R13, R18, R22 R4, R7, R9, R10, R17, R19, R20, R23 2 DESCRIPTION 47F, 16V low-ESR tantalum caps Sprague 593D476X0016E2W or AVX TPSD476M016R0150 0.1F ceramic capacitors 22nF ceramic capacitor 1F ceramic capacitors 10F, 10V tantalum capacitors Sprague 595D106X0010A2T 1000pF ceramic capacitor 0.5A, 20V Schottky diode (optional) Motorola MBR0520L 15k, 5% resistor 1k, 5% resistors SW1-SW4 8 100k, 5% resistors LED1 None None 4 1 1 1 L1 U1 JU1-JU10 JU11 JU12 J1 J2 8 1 1 10 1 1 1 1 DESIGNATION QTY R5 R12 R15 7 1 3 2 1 0 1 R14, R16 R21 1 1 1 2 1 DESCRIPTION 100k, 5% resistor 390k, 5% resistor 1M, 5% resistor 620k, 5% resistors 10k, 5% resistor 68H inductor Sumida CD54-680 MAX769EEI 2-pin headers 3-pin header 4-pin header 6-pin header 25-pin, female, right-angle connector Slide switches Mouser 10SP001 Green light-emitting diode MAX847/MAX769 PC board MAX769 data sheet
Idle Mode is a trademark of Maxim Integrated Products. SPI is a trademark of Motorola Corp.
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
MAX769 Evaluation Kit Evaluates: MAX769
Component Suppliers
SUPPLIER AVX CoilCraft Coiltronics Dale-Vishay Motorola Sprague Sumida Vishay/Vitramon PHONE 803-946-0690 708-639-6400 561-241-7876 402-564-3131 602-303-5454 603-224-1961 708-956-0666 203-268-6261 FAX 803-626-3123 708-639-1469 561-241-9339 402-563-6418 602-994-6430 603-224-1430 708-956-0702 203-452-5670
Manual Programming
The MAX769 is designed to be controlled by a serial interface; however, slide-switches SW1-SW4 and LED1 are provided on the EV kit to assist in "bench-top" evaluation (Table 1). See the MAX769 data sheet for descriptions of the programmable features and for more information on serial programming. To manually program data into the device, start with SW1, SW2, and SW3 high. Then sequence through the following steps: 1) Set SW3 (CS) low. 2) Set the first desired data input bit with SW2. 3) Toggle the serial clock down and up with SW1. Data is loaded on the SCL rising edge. 4) Repeat steps 2 and 3 for each of the next seven input data bits (for a total of eight bits). 5) Set SW3 high.
Note: Please indicate that you are using the MAX769 when contacting these component suppliers.
Quick Start
The MAX769 EV kit is fully assembled and tested. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed. 1) Check the positions of jumpers JU1-JU12. See Table 2 and the MAX769 data sheet for details. Jumper connections for the MAX847 and MAX769 are not the same. 2) Check the positions of switches SW1-SW4. SW1-SW3 should be high (closest to the top edge of the evaluation board). When testing the MAX769, SW4 is not used and should be disconnected by leaving JU12-1 open. 3) Connect a +3V supply voltage to the BATT pad. The power-supply ground connects to the GND pad. 4) Connect a voltmeter and load, if any, to the OUT pad. Note that the MAX769 is designed to start in the low-power (COAST) mode--it cannot supply full load until RUN mode is set after start-up (by the serial interface). 5) Turn on the input power supply and verify that the output voltage is 3.0V. This is the MAX769's starting OUT voltage. Other voltages can then be programmed via the serial interface (see MAX769 data sheet).
Connectors
The MAX769 evaluation board contains provisions for two types of connectors for serial-interface connections. One is a 6-pin single in-line header (J1) that contains only serial-interface connections. The other is a DB-25 pad footprint (J2) that has serial connections along with other IC pin connections. Pin/pad connections are outlined in Tables 3 and 4.
Table 1. Switch and LED Functions
SWITCH/ LED FUNCTION COMMENTS
SW1
Manual Serial Clock Input (SCL) Logic-high level is with switch pushed toward top of board. Logic-low level is with switch pushed toward switch label "SW1," "SW2," etc.
SW2 SW3
Manual Serial Data Input (SDI) Manual Chip-Select Input (CS) This switch does not function with MAX769. SW4 is RUN/COAST selection on MAX847 only. Visual Data Output (SDO)
SW4
LED1
LED on is logic-high output.
2
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MAX769 Evaluation Kit Evaluates: MAX769
Table 2. Jumper Selection
JUMPER NUMBER JU1 MAX769 DEFAULT POSITION On COMMENTS JU1 should be inserted if no external synchronous clock is used. If an external synchronous clock is applied, then JU1 should be removed. With JU2 inserted, the low battery input (LBI, LBO) is set to trip at 1V. With JU2 removed, LBI is set for 0.6V. JU2 should be removed when making no-load operating current measurements to prevent R12 and R14 from adding to the measured current. With JU3 inserted, the reset input (RSIN, RSO) is set to trip at 1.6V. With JU3 removed, RSIN is set for 0.6V. JU3 should be removed when making no-load operating current measurements to prevent R15 and R16 from adding to the measured current. JU4 connects a 100k pull-up resistor (R17) from REG1 to the open-drain RSO output. JU4 can be removed if RSO is not used or if a different pull-up resistor is used. JU5 connects a 100k pull-up resistor (R10) from REG1 to the open-drain LBO output. JU5 can be removed if LBO is not used or if a different pull-up resistor is used. JU6 connects an LED (LED1) to the serial data output (SDO). LED1 gives a visual indication of serial output data when manually programming the IC with SW1, SW2, and SW3. JU6 should be removed when using a P-controlled interface, since the LED will not be visible at digital clock speeds. JU6 should also be removed when making operating or quiescent-current measurements. JU7 connects SW1 to the serial clock input (SCL) (used to clock-in serial programming data). Insert JU7 when programming the IC manually with SW1, SW2, and SW3. Remove JU7 when using a digital serial interface at connector J1 or J2. JU8 connects SW2 to the serial data input (SDI) (used to set serial programming data). Insert JU8 when programming the IC manually with SW1, SW2, and SW3. Remove JU7 when using a digital serial interface at connector J1 or J2. JU9 connects SW3 to the chip-select input (CS) (used to activate the serial interface). Insert JU9 when programming the IC manually with SW1, SW2, and SW3. Remove JU9 when using a digital serial interface at connector J1 or J2. Remove JU10 when a MAX769 is used. JU10 connects SW4 to the RUN input (MAX847 only). JU11 has three pins to connect the REG2 input (REG2IN) to either REG1 (jumper J11-1 to J112) or OUT (jumper J11-2 to J11-3). JU12 has four pins. When the MAX769 is used, connect only jumper JU12-2 to JU12-3, leaving JU12-1 and JU12-4 open. When a MAX847 is inserted, connect jumper JU12-1 to JU12-2 and jumper JU12-3 to JU12-4.
JU2
On
JU3
On
JU4 JU5
On On
JU6
On
JU7
On
JU8
On
JU9 JU10 JU11
On Off JU11-1, JU11-2 JU12-2, JU12-3, JU12-1 (N.C.), JU12-4 (N.C.)
JU12
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MAX769 Evaluation Kit Evaluates: MAX769
Table 3. Connector Pinouts for J1 (6-Pin Header)
J1 PIN J1-1 J1-2 J1-3 J1-4 J1-5 J1-6 FUNCTION REG1 Output Voltage CS SDI SCL SDO GND
Table 4. Connector Pinouts for J2 (DB-25)
J2-PIN J2-1 J2-2 J2-3 J2-4 J2-5 J2-6 J2-7 J2-8 J2-9 J2-10 J2-11 J2-12 J2-13 J2-14 J2-15 J2-16 J2-17 J2-18 J2-19 J2-20 J2-21 J2-22 J2-23 J2-24 J2-25 FUNCTION BATT REG1 REG2 REG3 NICD CS N.C. (MAX769 only, RUN for MAX847) SDO SDI N.C. N.C. N.C. N.C. N.C. RSO LBO N.C. SCL N.C. N.C. N.C. N.C. N.C. GND GND
N.C. = No Connection
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GND RUN JU12-4 JU12-3 JU12-2 JU12-1 REG1 C3 0.1F SW3 2 3 1 CS R6 BATT CS RUN PGND JU1 1F R21 10k 4 CS SDI SCL SDO SYNC OUT C16 0.1F R20 100k C5 REG1 SDO 28 LX1 OUT LED1 JU6 R5 100 3 SDI 2 SDI JU8 SCL 5 SCL OUT 6 LBO LBI CH0 REF NICD 1M 10 RSIN RSO DR1 R2IN 18 19 16 15 DR2IN REG2 DR2 DRGND AGND REG3 20 REG3 21 C7 10F 10V REG2 22 1F OFS 14 C10 0.1F 2 OUT R1 15k 3 JU11 1 REG1 7 17 23 C14 NICD REG1 24 C6 10F 10V 11 R12 R11 R14 1k 620k R16 REF R15 OUT JU3 R17 JU4 100k R19 100k 1k DR2 J2-17 N.C. SCL N.C. N.C. N.C. N.C. N.C. J2-9 J2-10 SDI N.C. N.C. N.C. N.C. N.C. RSO LBO J2-24 J2-25 J2-22 J2-23 J2-20 J2-21 J2-18 J2-19 J2-11 J2-12 J2-13 J2-14 J2-15 J2-16 R18 DR1 620k 8 CHO 9 390k JU2 C2 47F 16V 25 1k R8 1k R7 100k C12 0.1F C13 R3 1k 1k 27 JU9 SDO R2 1k 26 1 D1 MBR0520L SW4 2 R4 100k L1 68H R23 100k R22 1k C8 0.1F C1 47F 16V BATT BATT JU10
C15 0.1F
3 3 SW2 2 1 1
REG1
REG1
3
SW1
2
OPTIONAL REF
1
J1-1 J1-2 J1-3 J1-4 J1-5 J1-6
Figure 1. MAX769 EV Kit Schematic
R9 100k
R10 100k
U1 MAX769
SYNC 13 R13 C11 1nF
FILT
12 C4 22nF
REG1 0.1F JU7
JU5
LBO
LBI
REG1
BATT
GND
RSI
REG1
RSO
REG1
DR2IN
J2-1 J2-2
BATT REG1
J2-3 J2-4
REG2 REG3
Evaluates: MAX769
_______________________________________________________________________________________
C9 1F
J2-5 J2-6
NICD CS
J2-7 J2-8
RUN SDO
MAX769 Evaluation Kit
5
MAX769 Evaluation Kit Evaluates: MAX769
1.0"
Figure 2. MAX769 EV Kit Component Placement Guide--Component Side
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MAX769 Evaluation Kit Evaluates: MAX769
1.0"
Figure 3. MAX769 EV Kit PC Board Layout--Component Side
_______________________________________________________________________________________
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MAX769 Evaluation Kit Evaluates: MAX769
1.0"
Figure 4. MAX769 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.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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