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19-2199; Rev 0; 10/01
MAX1878 Evaluation Kit
General Description
The MAX1878 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that demonstrates the MAX1878 dual-output, step-up, and step-down DCDC converter. The main output is configured for 1.8V and provides up to 400mA of current. The LCD bias output is configured for 18V and provides up to 10mA. The EV kit can support the dual output with an input voltage range of 2.0V to 5.5V. o Dual Output Voltages 1.8V Main Output at 400mA 18V LCD Bias Output at 10mA o Adjustable Output Voltages o 2.0V to 5.5V Input Voltage Range o Surface-Mount Construction o Fully Assembled and Tested
Features
Evaluates: MAX1878
Ordering Information
PART MAX1878EVKIT TEMP. RANGE 0C to +70C IC PACKAGE 12 QFN-EP*
*EP = Exposed pad
Component List
DESIGNATION QTY DESCRIPTION 10F 10%, 6.3V X5R ceramic capacitor (1206) TDK C3216X5R0J106KT or Taiyo Yuden JMK316BJ106KL 1.0F 10%, 6.3V X5R ceramic capacitor (0603) Taiyo Yuden JMK107BJ105KA or TDK C1608X5R1A105K 0.1F 10%, 50V X7R ceramic capacitor (0805) Taiyo Yuden UMK212BJ104KG or TDK C2012X7R1H104KT 22F 10%, 10V tantalum capacitor (B) AVX TPSB226K010R0500 5.0pF, 50V COG ceramic capacitor (0603) TDK C1608COG1H050C or Murata GRM1885C1H5R0JA01 22pF, 50V COG ceramic capacitor (0603) TDK C1608COG1H220JT or Murata GRM1885C1H220KA01 DESIGNATION QTY D1 JU1, JU2 L1, L2 R1 R2 R3 R4 R5 R6 U1 None None None None 1 2 2 1 1 1 1 1 1 1 2 1 1 1 DESCRIPTION 200mA diode (SOT23) Fairchild MMBD4148 (Top mark - 5H) 3-pin headers 10H, 550mA inductors 28k 1% resistor (0603) 63.4k 1% resistor (0603) 3.65M 1% resistor (0603) Venkel CR0603-16W-3654-F-T 267k 1% resistor (0603) 10 5% resistor (0603) 2M 5% resistor (0603) MAX1878EGC (12-pin QFN 4 x 4 EP) Top mark-AAAO Shunts (JU1, JU2) MAX1878 PC board MAX1878 data sheet MAX1878 EV kit data sheet
C1
1
C2
1
C3
1
C4
1
C5
1
C6
1
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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.
MAX1878 Evaluation Kit Evaluates: MAX1878
Component Suppliers
SUPPLIER AVX Fairchild Murata Sumida Taiyo Yuden TDK Venkel PHONE 843-946-0238 888-522-5372 770-436-1300 847-545-6700 800-348-2496 847-803-6100 800-950-8365 FAX 843-626-3123 408-822-2104 770-436-3030 847-545-6720 847-925-0899 847-803-6296 512-794-0087 WEBSITE www.avxcorp.com www.fairchildsemi.com www.murata.com www.sumida.com www.t-yuden.com www.component.tdk.com www.venkel.com
Note: Please indicate that you are using the MAX1878 when contacting these component suppliers.
Quick Start
The MAX1878 EV kit is a fully assembled and tested surface-mount board. Follow the steps below for board operation. Do not turn on the power supply until all connections are completed: 1) Verify that shunts are across pins 1 and 2 of jumpers JU1 (ONLCD) and JU2 (ON) to enable the LCD output and the main output, respectively. 2) Connect a voltmeter across the VMAIN pad and the nearest GND pad to monitor the main output voltage. 3) Connect a voltmeter across the VLCD pad and the nearest GND pad to monitor the LCD output voltage. 4) Connect a 2.0V to 5.5V supply to the VIN pad. Connect the ground to the GND pad. 5) Turn on the power supply and verify that the main output voltmeter is at 1.8V and the VLCD output is at 18V.
Detailed Description
The MAX1878 EV kit is a fully assembled and tested surface-mount circuit containing a dual-output, stepdown, and step-up DC-DC converter. The main output (VMAIN) is configured to supply 400mA (typ) at 1.8V and the LCD bias output (VLCD) is configured to supply 10mA (typ) at 18V. The EV kit circuit requires a power supply with a 2.0V to 5.5V voltage range and rated for 0.5A. VMAIN and VLCD output voltages are adjustable.
Adjustable Outputs
The VMAIN output voltage is set to 1.8V by resistors R1 and R2. VMAIN can be adjusted to a different voltage (1.25 to VIN) by replacing resistors R1 and R2. Refer to Setting the Output Voltage section of the MAX1878 data sheet for instructions on selecting R1 and R2. The 18V LCD bias output voltage is set with voltagedivider resistors R3 and R4. VLCD can be adjusted to a different voltage (from 1V above VIN to 28V) by replacing resistors R3 and R4. Refer to Setting the Output Voltage section of the MAX1878 data sheet for instructions on selecting R3 and R4.
Enable/Disable
The EV kit contains two 3-pin jumpers (JU1 and JU2) that allow the user to enable and disable the main output (VMAIN) and the LCD output (VLCD). See Table 1 for jumper configurations.
Table 1. Jumper Table
JUMPER JU1 JU2 STATUS 1 and 2 2 and 3 1 and 2 2 and 3 PIN CONNECTION ONLCD connected to AIN ONLCD connected to GND ON connected to AIN ON connected to GND EV KIT OPERATION VLCD output enabled VLCD output disabled VMAIN output enabled VMAIN output disabled
2
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MAX1878 Evaluation Kit Evaluates: MAX1878
L2 10H
VIN C1 10F AIN R5 10
1 PIN
LXLCD
9
D1 C3 0.1F C5 5pF R3 3.65M 1%
VLCD
GND
4 AUX C2 1F
FBLCD
6 R4 267k
U1 MAX1878
AIN 1 ONLCD 2 3
3 AIN L1 10H
JU1 AIN 1
10 ONLCD
LX
2 R6 2M
C6 22pF VMAIN
ON
2 JU2 3
7 ON FB 8 AGND 12 PGND 11 5 R2 R1 63.4k 28k 1% 1% PGNDLCD C4 22F 10V
GND
Figure 1. MAX1878 EV Kit Schematic
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3
MAX1878 Evaluation Kit Evaluates: MAX1878
Figure 2. MAX1878 EV Kit Component Placement Guide-- Component Side
Figure 3. MAX1878 EV Kit PC Board Layout--Component Side
Figure 4. MAX1878 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.
4 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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