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PR4402 Datasheet(PDF) 1 Page - PREMA Semiconductor. |
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PR4402 Datasheet(HTML) 1 Page - PREMA Semiconductor. |
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1 / 12 page  LED Driver PR4401 / PR4402 0.9 V Boost Driver for White LEDs Requires Only One External Component The PR4401 and PR4402* are single cell step-up converters for white LEDs operating from a supply voltage of less than 0.9 V. Only one external inductor is needed for operation of a white LED. PR4401 is recommended for mean LED currents of up to 20 mA, PR4402 for up to 40 mA. This makes PR4401 and PR4402 ideal for use in low-cost or small-sized applications such as LED flashlights or LCD backlighting for portable devices. FEATURES • minimum startup voltage 0.9 V • 200 / 250 mA peak output current • only one external component required • battery deep discharge protection APPLICATIONS • Small-sized LED torches • LCD backlighting • LED indicator lights TYPICAL APPLICATION For output currents higher than 20 mA an additional blocking capacitor at Vcc is recommended. PIN DESCRIPTION Topside marking: "UI" (PR4401) or "UJ" (PR4402) with a two-digit lot code Package SOT23-3 or COB on request The inductance L1 determines the LED current: Inductance L1 Mean current For 47 µH 6.5 mA PR4401 32 µH 8.3 mA PR4401 26.7 µH 10.8 mA PR4401 22 µH 11 mA PR4401 14.7 µH 14 mA PR4401 10 µH 22 mA PR4401/4402 6.8 µH * 32 mA * PR4402 4.7 µH * 40 mA * PR4402 PIN Description: PIN Name PIN Function Description Vcc Supply voltage Vout Output voltage, LED connection Gnd Ground connection * PR4402 only measured with inductor Murata type LQH32C series 10 - 22 µH: one white LED 4.7 - 6.8 µH: two white LEDs in parallel © PREMA Semiconductor GmbH 2006-2014 I rev. 1014 Page 1/12 Vcc Gnd Vout PR4401/02 Vbat =1.2 V or 1.5 V L1 White LED Vcc Vout Gnd top view |
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