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BAT54 Folha de dados(PDF) 2 Page - SamHop Microelectronics Corp. |
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BAT54 Folha de dados(HTML) 2 Page - SamHop Microelectronics Corp. |
2 / 14 page GENERAL DESCRIPTION The SM8237 is a step-up DC/DC converter specifically designed to drive white LEDs with a constant current. The device can drive two, three or four LEDs in series from a Li-ion cell. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. The SM8237 switches at 1.2 MHz, allowing the use of tiny external components. The output capacitor can be as small as 0.22μF, saving space and cost versus alternative solutions. A low 95mV feedback voltage minimizes power loss in the current setting resistor for better efficiency. FEATURES * Inherently matched LED current * High efficiency : 84% typical * Drives up to four LEDs from a 2.8V supply * Drives up to six LEDs from a 5V supply * 36V rugged bipolar switch * Fast 1.2MHz switching frequency * Uses tiny 1 mm tall inductors * Requires only 0.22μF output capacitor * Low profile TSOT package SAMHOP Microelectronics Corp. 1.2MHz STEP-UP CONVERTER TYPICAL APPLICATION C1 , C2 : X7R Dielectric D1 : Frontier electronics SS14 L1 : Frontier electronics CSS0218P-22ON-LFR 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 0 1020304050 60708090 100 105 OUTPUT CURRENT (mA) Page 1 V.1.3 Aug 28,2007 50 55 60 65 70 75 80 85 90 95 100 0 1020 3040 506070 80 90 100 105 OUTPUT CURRINT (mA) OUTPUT VOLTAGE vs. LOAD CURRENT EFFICIENCY vs. LOAD CURRENT Output Current (mA) Vin = 3.3V Vin = 3.3V Vout = 5V Output Current (mA) SM8237 Vin SW SD FB GND L1 22 uH D1 R1 51 K C2 1 uf Vout 5V / 100 mA R2 1 K C1 4.7 uf 1 5 3 2 4 Vin 3.3 V OFF ON |
Nº de peça semelhante - BAT54 |
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Descrição semelhante - BAT54 |
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