MIC2185 Evaluation Board Synchronous Boost General Descripti

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MIC2185 Evaluation Board Synchronous Boost General Descripti

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MIC2185
MIC2185 Evaluation Board
Synchronous Boost
General Description
This evaluation board provides platform evaluating MIC2185 synchronous boost controller boost topology. evaluation board schematic shown Figure Please refer MIC2185 data sheet detailed explanation MIC2185 boost converter operation.
3.3V 3.3V
VOUT
Maximum IOUT 4.5A 1.75A
2.5A Table Maximum Input/Output Voltage
Specifications
Recommended operating input voltage 2.9V Output voltage, user selectable (see Table Maximum input output voltage Maximum output current. (see Table Output switching frequency duty cycle, user selectable. (see Table
Requirements
evaluation board requires input power source. source must able supply least 8.5A maximum power from output. output loaded with resistive active load. active load constant current constant resistance mode.
Precautions
evaluation board does have input reverse polarity protection. Applying negative voltage terminal (with respect ground) permanently damage components board. maximum input voltage limited MIC2185 maximum voltage rating. Exceeding this voltage damage exceed output. VINP MIC2185 connected output voltage. Exceeding damage part.
maximum demo board output current depends input output voltage. These limitations demo board circuit MIC2185 controller. Table lists maximum output current several common boost configurations.
Schematic
+VIN14 100k open 4.7µH 47µF 0.1µF MIC2185
En/UVLO Freq. Select
Si9803DY
EN/ULVO FREQ/2 SKIP SYNC VREF COMP SGND
VINA VINP OUTP
Si4884DY Si4884DY 100k 0.010
Si9803DY
14VMAX
SYNC
OUTN PGND
B130 120µF 120µF 120µF 0.1µF
0.1µF 0.1µF omit 0.01µF
3.32k
1.62k
1.15k
open
Micrel, Inc. 1849 Fortune Drive Jose, 95131 (408) 944-0800 (408) 944-0970 http://www.micrel.com
August 2001
MIC2185
MIC2185
Jumper JP1-A JP1-B JP1-C JP1-D Description Sets VOUT Sets VOUT Sets VOUT
Getting Started
Connect input voltage source terminal terminal ammeter placed between source terminal monitor input current. Connect load output terminal, terminal ammeter used output well. output voltage with jumper JP1. Apply 3.3V input. main output voltage, measured between terminals should selected value. switching waveform (VSW) monitored with oscilloscope junction inductor, drain MOSFET,
Sets VOUT custom voltage resistor location Table Output Voltage Jumper Selection
Input Undervoltage Lockout
Resistors input undervoltage lockout feature. When (EN/UVLO) pulled VIN, MIC2185 typically turns input voltage 2.9V. turn-on voltage increased using R5/R6 voltage divider. formula calculate turn-on voltage
Jumper Settable Options
There jumpers board that used select various options output voltage. Three standard voltages selected placing shorting jumper across proper pins header JP1, illustrated output voltage jumper selection (Table 2.). Open resistor location allows user program output voltage from 14V. desired output voltage resistor value calculated following equation.
Where: desired input voltage when MIC2185 starts switching. 100K resistor evaluation board.
1.245 VOUT 1.245
Where: resistor evaluation board.
Jumper
Function Output Voltage Select Frequency Select PWM/SKIP Mode Select External Sync Select
Description Selects output voltage Selects 400kHz 200kHz switching frequency Sets SKIP mode Remove external sync
Table Jumper Chart
MIC2185
August 2001
MIC2185
Bill Materials
Item J1-J9 JP1, CRCW08053321FRT1 CRCW08051621FRT1 CRCW08051151FRT1 CRCW08051000FRT1 CRCW08051003FRT1 Vishay Vishay Vishay Dale2 Dale2 Dale2 Part Number Micrel MIC2185BM 594D127X0020R2T 594D476X0020D2T VJ0805Y102KXXMB VJ0805Y103KXXMB VJ0805Y104KXXMB GRM40X7R 105M SS13 (SMA Package) B130 (SMA Package) 2551-2-00-01-00-00-07-0 S2012-04-ND S1012-02-ND S1012-03-ND CDRH127-4R7 Siliconix Si4884DY Siliconix Si9803DY CRCW08051002FRT1 WSL-2010-R010-F Manufacturer Micrel1 Vishay Dale2 Vishay Vishay Dale2 Vitramon2 Vishay Vitramon2 Vishay Vitramon2 muRata Micro commecial components3 Diodes. Inc4 MilMax Sullins Sullins Sullins Sumida5 Vishay Siliconix2 Vishay Siliconix2 Vishay Dale2 Vishay Dale2 Description Boost controller 120uf, 20V, tantalum 47uf, tantalum 1nf, 25V,X7R ceramic 0.01uf, 25V,X7R ceramic 0.1uf, 25V,X7R ceramic 1uf, ceramic, schottky diode Turret Pins header header header 4.7uH, inductor MOSFET MOSFET (0805 size), 0.010 ohms (2010 size), open location (0805 size) 3.32K (0805 size), 1.62K (0805 size), 1.15K (0805 size), (0805 size), 100K (0805 size), shorting jumper
Micrel Semiconductor, tel: 408-944-0800, http://www.micrel.com Vishay Corp., tel: 206-452-5664, http://www.vishay.com Micro Commercial Corp., tel: (800) 346-3371 Diodes Inc, tel: (805) 446-4800, http://www.diodes.com Sumida, tel: (510) 668-0660, http://www.sumida.com muRata, tel: 800-831-9172
Vishay Dale2 Vishay Dale2
August 2001
MIC2185
MIC2185
Printed Circuit Board Layouts
Top-Side Silk Screen
Bottom-Side Silk Screen
Top-Side Copper
Bottom-Side Copper
MICREL INC.
1849 FORTUNE DRIVE JOSE, 95131
(408) 944-0800
(408) 944-0970
http://www.micrel.com
This information believed accurate reliable, however responsibility assumed Micrel infringement patents other rights third parties resulting from use. license granted implication otherwise under patent patent right Micrel Inc. 2001 Micrel Incorporated
MIC2185
August 2001

MIC2185 Evaluation Board Synchronous Boost General Descripti

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