MIC2194 Evaluation Board 400kHz SO-8 Buck Control Introducti

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MIC2194 Evaluation Board 400kHz SO-8 Buck Control Introducti

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MIC2194 Evaluation Board
MIC2194 Evaluation Board
400kHz SO-8 Buck Control
Introduction
Micrel's MIC2194 high efficiency non-synchronous buck control housed SO-8 package. 2.9V input voltage range allows efficiently step down voltages 3.3V, systems well 2-cell Li-Ion battery powered applications. MIC2194 solution saves valuable board space. device housed space-saving SO-8 package, whose pin-count minimizes external components. 400kHz operation allows small inductor small output capacitors used. MIC2194 drives high-side P-Channel MOSFET, eliminating need high-side bootstrap circuitry. This feature allows MIC2194 achieve maximum duty cycles 100%, which useful headroom applications. output driver impedance allows MIC2194 drive large external MOSFETs generate wide range output currents. MIC2194 available 8-pin SOIC package with junction temperature range -40°C +125°C. MIC2194 Evaluation Board Input/Output Voltages Load Current MIC2194 evaluation board designed operate from 3.3V produce output voltage 1.5V, 1.8V, 2.5V, 3.3V load current Quick-Start Guide Refer Figure following: Connect positive terminal from power supply post (J1) MIC2194 evaluation board. Connect terminal input power supply (J2). Connect digital voltmeter across VOUT (J3) (J4) measure output voltage. Program output voltage selecting jumper 3.3V, 2.5V, 1.8V, 1.5V position. Remove jumper power board. After turning input supply output voltage should read programmed output voltage.
MICREL, INC. MIC2194BM
VOUT
Figure MIC2194 Evaluation Board Hook-up
Micrel, Inc. 1849 Fortune Drive Jose, 95131 (408) 944-0800 (408) 944-0970 http://www.micrel.com
October 2003
MIC2194 Evaluation Board
MIC2194 Evaluation Board
Evaluation Board Schematic
3.3V 100µF
100k 22nF MIC2194
0.015
100µF
Si4403DY
Open
2.5µH
VOUT
EN/UVLO OUTP COMP
/SHDN
Open 30.1k Open 300pF
B530
330µF 6.3V
330µF 6.3V
open
VOUT 48.7k
22.6k
6.03k
Header
1.5V
1.8V
2.5V
3.3V
MIC2194 Evaluation Board
October 2003
MIC2194 Evaluation Board
Evaluation Board Efficiency Figures show MIC2194 efficiency input voltages 3.3V various output voltages.
MIC2194 Efficiency Output Load Current
VOUT 3.3V VOUT 2.5V
20mV/div
Output Transient Response
EFFICIENCY
VOUT 1.8V VOUT 1.5V Si4403DY IOUT
VOUT 1.5V ILOAD 0.5A
TIME (200µs/div)
Figure MIC2194 Evaluation Board Efficiency VOUT 3.3V, 2.5V, 1.8V 1.5V
MIC2194 Efficiency Output Load Current
VOUT 2.5V
Figure MIC2194 Output Transient Response VOUT 1.5V, ILOAD 0.5A
Output Transient Response
EFFICIENCY
3.3V Si4403DY VOUT 1.5V VOUT 1.8V
20mV/div
IOUT
Figure MIC2194 Efficiency 3.3V VOUT 2.5V, 1.8V 1.5V Transient Response Figures thru show transient response output voltage ripple MIC2194 evaluation board input voltage 3.3V.
Output Transient Response
3.3V VOUT 2.5V ILOAD 0.5A
TIME (200µs/div)
Figure MIC2194 Output Transient Response 3.3V, VOUT 2.5V, ILOAD 0.5A
Output Transient Response
50mV/div
VOUT 3.3V ILOAD 0.5A
TIME (200µs/div)
20mV/div
3.3V VOUT 1.5V ILOAD 0.5A
TIME (200µs/div)
Figure MIC2194 Output Transient Response VOUT 3.3V, ILOAD 0.5A
Figure MIC2194 Output Transient Response 3.3V, VOUT 1.5V, ILOAD 0.5A
October 2003
MIC2194 Evaluation Board
MIC2194 Evaluation Board
Output Voltage Ripple Output Voltage Ripple
20mV/div
VOUT 3.3V ILOAD
TIME (4µs/div) TIME (4µs/div)
20mV/div
3.3V VOUT 1.5V ILOAD
Figure MIC2194 Output Voltage Ripple VOUT 3.3V, ILOAD
Figure MIC2194 Output Voltage Ripple 3.3V, VOUT 1.5V, ILOAD
MIC2194 Evaluation Board
October 2003
MIC2194 Evaluation Board
Bill Materials
Item Part Number 594D107X0020D2T GRM21BR71C105KA01B VJ0805S105KXJAT C2012 105K VJ0805Y223KXXAT 594D337X06R3D2T VJ0805Y301KXXAT B530 SS53 SK54-L 2551-2-00-01-00-00-07-0 S2012-04-ND S1012-02-ND SNT-100-BL-G CDRH104R-2R5 Si4403DY Si4403DY VJ08053012FRT1 WSL-2010-R010-F VJ08056031FRT1 VJ08051002FRT1 VJ08054872FRT1 VJ08052262FRT1 VJ08051003FRT1 VJ080515R0FRT1 MIC2194-BM Vishay/Siliconix Vishay Dale Vishay Dale Vishay Dale Vishay Dale Vishay Dale Vishay Dale Vishay Dale Vishay Dale Micrel Semiconductor Manufacturer Vishay/Sprague Murata Vishay Vitramon Vishay Vitramon Vishay/Sprague Vishay Vitramon Vishay Dale Diodes, Inc. Vishay MilMax Sullins Sullins Samtec Sumida Description 100µF, tantalum capacitor 1µF, ceramic capacitor 1µF, 16V, ceramic capacitor 22nF ceramic capacitor 330µF, 6.3V tantalum capacitor 300pF, ceramic capacitor open, size 0805 Schottky diode Qty.
C12,
J1-J5 JUMPER
Turret Pins header header shorting jumper 2.5µH, inductor open MOSFET 30.1k, size 0805,1/10W, 0.010, size 2010, 6.03k, size 0805, 10k, size 0805, 48.7k, size 0805, 22.6k, size 0805, 100k, size 0805, size 0805, Buck controller
Vendor Phone Numbers: Vishay Corp. tel: 206-452-5664 Murata tel: 800-831-9172 tel: 847-803-6100 Diodes, Inc. tel: 805-446-4800 tel: 800-346-3371 Sumida tel: 408-321-9660 Micrel Semiconductor tel: 408-944-0800
Shaded items being used evaluation board.
October 2003
MIC2194 Evaluation Board
MIC2194 Evaluation Board
Printed Circuit Board Layouts
Figure 10a. Silkscreen
Figure 10c. Bottom Silkscreen
Figure 10b. Layer
Figure 10d. Bottom Layer
MICREL, INC.
1849 FORTUNE DRIVE JOSE, 95131
(408) 944-0800
(408) 944-0970
http://www.micrel.com
information furnished Micrel this datasheet believed accurate reliable. However, responsibility assumed Micrel use. Micrel reserves right change circuitry specifications time without notification customer. Micrel Products designed authorized components life support appliances, devices systems where malfunction product reasonably expected result personal injury. Life support devices systems devices systems that intended surgical implant into body support sustain life, whose failure perform reasonably expected result significant injury user. Purchaser's sale Micrel Products life support appliances, devices systems Purchaser's risk Purchaser agrees fully indemnify Micrel damages resulting from such sale. 2003 Micrel, Incorporated.
MIC2194 Evaluation Board
October 2003

MIC2194 Evaluation Board 400kHz SO-8 Buck Control Introducti

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