sc615a Semtech Corporation, sc615a Datasheet
sc615a
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sc615a Summary of contents
Page 1
... An external resistor is connected in series with the LED to set the current. In Flash mode, this resistor can dissipate up to 175mW, reducing the power dissipation requirement of the SC615A. The fl ash input (FLASH) overrides the control input (CTRL) to make sure the fl ash function is activated when called for. ...
Page 2
... OUT 3.0V < V < 4.5V IN FLASH high 0.5W ISET 3.3V < V < 4.2V IN 2.8V < V < 4.25V OUT FLASH low, CTRL high 0.5Ω ISET 2.8V < V < 4.5V, 3.0V < V < 4.5V OUT IN 2 SC615A Maximum Units -0.3 to 6.5 V -0.3 to 6 0.3 V OUT Indefi nite 49 °C/W -40 to +85 °C -40 to +150 °C -65 to +150 ° ...
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... Device Enabled OUT 3.3V < V < 4. 3.7V 3.7V 25°C IN OUT A Hysteresis FLASH, CTRL FLASH, CTRL FLASH CTRL FLASH, CTRL Spotlight mode - I = 200mA OUT FLASH mode - I = 500mA OUT 3 SC615A Min Typ Max Units 3 2.0 4.5 mA 0.1 2 μA 500 250 kHz - 465 mA 2 ...
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... Semtech Corp. Ordering Information DEVICE C2+ 10 SC615AMLTRT VOUT 9 SC615AEVB C1+ 8 Notes: (1) Available in tape and reel only. A reel contains 3000 devices. 7 CTRL (2) Available in lead-free package only. This product is fully WEEE and RoHS compliant. 6 ISET 4 SC615A PACKAGE MLPD-10 3x3 (1) (2) Evaluation Board www.semtech.com ...
Page 5
... POWER MANAGEMENT Block Diagram 10μF VBAT CTRL FLASH © 2008 Semtech Corp. VIN LDO 250 kHz CTRL Logic Control CHARGE FLASH PUMP Reference Voltage Generator 5 SC615A C1+ 1μF C1- C2+ 1μF C2- VOUT 1μF white LED GND ISET 0.5 Ω www.semtech.com ...
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... POWER MANAGEMENT Applications Information General Operation The SC615A is a powerful 2X charge pump designed to drive a high-intensity white LED with a constant current (Spotlight mode) or with a pulsed current of higher intensity (Flash mode) used for camera fl ash. In Flash mode the SC615A output can drive 500mA at 4 ...
Page 7
... For this reason crucial to have a low resistance return path. Place and ground the resistor as close as possible to the ground pin of the SC615A. The trace from the ISET pin has virtually no current. The ISET trace should make contact at the pad of the power sense resistor to minimize the effect of voltage drop between the LED cathode and the resistor ...
Page 8
... V = 3.7V IN 480 460 400 500 3.30 540 520 500 480 460 3.30 4.35 4.80 5.25 8 SC615A Flash Current at 500ms, RISET = 500mΩ, VOUT = 3.38V 3.45 3.60 3.75 3.90 4.05 VIN [V] Flash Current at 100ms, RISET = 500mΩ, VOUT = 3.46V 3.45 3.60 3.75 3.90 4.05 VIN [V] Flash Current at 10ms, RISET = 500mΩ, VOUT = 3.52V 3.45 3.60 3.75 3 ...
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... Flash Current at 10ms, RISET = 350mΩ, VOUT = 3.62V 755 735 715 695 675 3.30 3.45 3.60 3.75 VIN [V] © 2008 Semtech Corp. 3.90 4.05 4.20 3.90 4.05 4.20 3.90 4.05 4.20 9 SC615A Flash Mode VISET Ripple Ch1 100mV/div Ch2 2V/div Ch3 2V/div 4us/div Startup Flash Mode 500mA Ch1 100mV/div Ch2 2V/div Ch3 2V/div 40us/div www.semtech.com ...
Page 10
... C3 is the output decoupling ca- pacitor placed near the SC615A VOUT pin the input decoupling capacitor placed near the SC615A VIN pin. Multiple vias should be used whenever it is necessary to change layers on nets connecting to pins VIN, VOUT, GND, C1-, C1+, C2- and C2+ ...
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... Semtech Corp DIM aaa bbb A SEATING PLANE bxN e bbb SC615A DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX - - .031 .039 0.80 1. .000 .002 0.00 0.05 - (.008 (0.20) - .007 .009 .011 0.18 0.23 ...
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... Phone: (805) 498-2111 FAX (805)498-3804 © 2008 Semtech Corp. K DIM Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 www.semtech.com 12 SC615A DIMENSIONS INCHES MILLIMETERS (.112) (2.85) .075 1.90 .055 1.40 .087 2.20 .020 0.50 .012 0.30 .037 0.95 .150 3.80 www.semtech.com ...