3494fa.indd karenkoehler

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Specifications	3494fa.indd karenkoehler
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LT3494/LT3494A 1 3494fb TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION Micropower Low Noise Boost Converters with Outp

Specifications	3494fa.indd karenkoehler
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Content	LT3494/LT3494A 1 3494fb TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION Micropower Low Noise Boost Converters with Output Disconnect The LT®3494/LT3494A are low noise boost converters with integrated power switch, Schottky diode and output disconnect circuitry. The parts use a novel* control tech- nique resulting in low output voltage ripple as well as high efﬁ ciency over a wide load current range. This technique guarantees that the switching frequency stays above the audio band for the entire load range. The parts feature a high performance NPN power switch with a 350mA and 180mA current limit for the LT3494A and LT3494 respectively. The quiescent current is a low 65µA, which is further reduced to less than 1µA in shutdown. The internal disconnect circuitry allows the output voltage to be isolated from the input during shutdown. An auxiliary reference input (CTRL pin) overrides the internal 1.225V feedback reference with any lower value allowing full control of the output voltage during operation. The LT3494/LT3494A are available in a tiny 8-lead 3mm × 2mm DFN package. OLED Power Supply from One Li-Ion Cell ■ Low Quiescent Current 65µA in Active Mode 1µA in Shutdown Mode ■ Switching Frequency is Non-Audible Over Entire Load Range ■ Integrated Power NPN: 350mA Current Limit (LT3494A) 180mA Current Limit (LT3494) ■ Integrated Schottky Diode ■ Integrated Output Disconnect ■ Integrated Output Dimming ■ Wide Input Range: 2.3V to 16V ■ Wide Output Range: Up to 40V ■ Tiny 8-Lead 3mm × 2mm DFN Package ■ OLED Power ■ Low Noise Power ■ MP3 Players , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. *Patent pending. SWCAP VCC SHDN CTRL VOUT FB GND 2.21M 3494 TA01a LT3494 4.7µF 2.2µF 15µH 0.22µF VIN3V TO 4.2V VOUT16V 16mA LOAD CURRENT (mA) 0.10 V OUT PEAK-TO-PEAK RIPPLE (mV) 10 15 110100 3494 TA01b 5 LT3494 FIGURE 5 CIRCUIT 100MHz MEASUREMENT BW LOAD CURRENT (mA) 0.1 60 EFFICIENCY (%) POWER LOSS (mW)70 80 90 110100 3494 TA01c 50 40 30 20 160 200 240 280 120 80 40 0 VIN = 3.6VLOAD FROM CAPACITOR LOAD FROM VOUT Output Voltage Ripple vs Load Current Efﬁ ciency and Power Loss vs Load Current
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Following Datasheets	35-1_2 (2 pages) 35_2 (1 pages) 3500fb (28 pages) 3508fb (24 pages) 350_appnote (1 pages) 350_appnote2 (1 pages) 352001 (1 pages) 3526lfb (16 pages) 3526llb2f (16 pages) 355_manual (23 pages)
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