Constant-Current Driver William following circuit shows MIC2142 e
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Constant-Current Driver William
following circuit shows MIC2142 evaluation board modified tightly control current going through string series LEDs 3.0V 4.2V 1-cell Li-Ion applications.
Circuit Performance
White/blue driver 1-Cell Li-Ion (3.0V 4.2V) Efficiency input (min.) 15mA load Output ripple voltage 100mV Low-profile solution
MBR0530 +VOUT ~11.8V
White White White
+VIN 3.0V 4.2V
22µH
VOUT
10µF/6.3V
MIC2142
10µF/16V
Typical 1.28V
86.6 Current 15mA
SHDN
1µF/25V
Circuit Constant-Current Driver
3.0V White LEDs 22µH
MAXIMUM CURRENT (mA)
NP04S B220M
EFFICIENCY
A914BYW-220M CLQ4D10-220 NP04S B220M LDR655312T-220W LQH32CN220K1
Maximum Allowable Current 20mA
CLQ4D10-220 A914BYW-220M
LDR655312T-220W
LQH32CN220K1 CURRENT (mA)
INPUT VOLTAGE
Figure Typical Efficiency Current with Various Inductor Types
Figure Maximum Current Minimum Input Voltage
EFFICIENCY
NP04S B220M
NP04S B220M CLQ4D10-220
EFFICIENCY
CLQ4D10-220 A914BYW-220M LDR655312T-220W LQH32CN220K1 INPUT VOLTAGE
A914BYW-220M
LDR655312T-220W LQH32CN220K1
4.2V White LEDs 22µH
CURRENT (mA)
Figure Typical Efficiency Maximum Current
Figure Typical Efficiency 4.2V Input Voltage
Micrel, Inc. 1849 Fortune Drive Jose, 95131 (408) 944-0800 (408) 944-0970 http://www.micrel.com
June 2002
Part Number CLQ4D10-220 LDR655312T-220W LQH32CN220K21 A914BYW-220M NP04S B220M
Manufacturer Sumida Murata Toko Taiyo Yuden
Max. Height (mm) 0.02
Table Recommended Inductors
Bill Materials
Reference Part Number GRM40X5R106K6.3 GRM235Y5V105Z25 GRM42-2X5R106K16 MBR0530 MBR0530 B0530W LQH32CN220K21 CLQ4D10-220 LDR655312T-220W A914BYW-220M NP04S B220M CRCW060386R6FRT1 CRCW06031001JRT1 CRCW06031004JRT1 MIC2142BM5 Manufacturer Murata(1) Murata(1) Murata(1) Micro Commercial Corp.(3) Diodes, Inc.(4) Murata(1) Sumida(5) TDK(6) Toko(7) Taiyo Yuden(8) Vishay-Dale(9) Vishay-Dale(9) Vishay-Dale(9) Micrel Semiconductor(10) Semiconductor(2) Description 10µF, 6.3V Ceramic 1µF, Ceramic 10µF, Ceramic 0.5A, Schottky Rectifier
22µH
86.6, 1/16W, Size 0603 1/16W, Size 0603 1/16W, Size 0603 Micro-power Boost Converter
Murata tel: 949-916-4000 Semiconductor tel: 800-344-3860 Micro Commercial Corp. tel: 800-346-3371 Diodes Inc. tel: 408-342-1220 Sumida tel: 510-668-0600 tel: 847-390-4366 Toko tel: 408-432-8281 Taiyo Yuden tel: 408-573-4150 Vishay-Dale tel: 402-644-4218 Micrel Semiconductor tel: 408-944-0800
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. 2002 Micrel, Incorporated
June 2002
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