SC620EVB | DigiCamel IC Datasheet

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Sub Panel Color/R/G/B LEDs 1μF SCL SDA EN Main Panel LED Backlighting www.semtech.com POWER MANAGEMENT SC620 Octal LED Driver, General Purpose Current Sink with Serial Interface

Exceeding the speciﬁ cations below may result in permanent damage to the device or device malfunction. Operation outside of the parameters speciﬁ ed in the Electrical Characteristics section is not implied. Unless otherwise noted, TA = +25°C for Typ, -40ºC to 85°C for Min and Max, VIN = 2.7V to 5.5V, CIN = 1μF, ∆VF ≤ 1.5V Parameter Symbol Condition Min Typ Max Units Maximum LED Current Setting(1) ILEDn 25 mA LED Current Setting Accuracy(1) ∆ILEDn 0.5mA ≤ ILEDn ≤ 5mA, TA = 25ºC -250 250 μA 5mA < ILEDn ≤ 25mA, VF = 3.4V, VILEDn = 2V, TA = 25ºC -5 5 % Load Regulation ∆ILEDn/ ∆VF 5mA < ILEDn ≤ 25mA, TA = 25ºC -2 2 % / V LED Current Matching Accuracy(1) ILED-to-LED 0.5mA ≤ ILEDn ≤ 5mA, TA = 25ºC -150 150 μA 5mA < ILEDn ≤ 25mA, TA = 25ºC -3 3 % Dropout Voltage V DO ILEDn = 25mA 150 mV Shutdown Current I SHDN EN = GND 0.1 1 μA Current Step Size I STEP Normal Mode(3) 500 μA Low-Current Mode(4) 31.25 μA Quiescent Current I Q Standby: EN = VIN, LED1-8 disabled(2) 60 μA EN = VIN, ILED1-8 = 1.968mA(4) 720 μA EN = VIN, ILED1-8 = 25mA(3) 4.5 mA Absolute Maximum Ratings

Electrical Characteristics

Parameter Symbol Maximum Units Input Supply Voltage VIN -0.3 to +6.0 V Pin Voltage - All Other Pins -0.3 to V IN+0.3 V Short Circuit Duration - All Outputs tSC Indeﬁ nite s Operating Ambient Temperature Range TA -40 to +85 °C Operating Junction Temperature Range TJ -40 to +150 °C Storage Temperature TSTG -65 to +150 °C Peak IR Reﬂ ow Temperature TPKG 260 °C Thermal Resistance - Junction to Ambient(1) θJA 39 °C/W ESD Protection Level(2) VESD 2k V Note: 1) Calculated from package in still air, mounted to 3” x 4.5”, 4 layer FR4 PCB with thermal vias under the exposed pad as per JESD51 standards. 2) Tested according to JEDEC standard JESD22-A114-B © 2006 Semtech Corp. www.semtech.com POWER MANAGEMENT SC620

Parameter Symbol Condition Min Typ Max Units Current Sink Turn-on Time t ON from 0 to 95% of target 1 ms Current Sink Turn-off Time t OFF from 90% to 10% of set value 1 μs EN Input High Threshold V IH VIN = 5.5V 1.6 V EN Input Low Threshold V IL VIN = 2.7V 0.4 V EN Input High Current I IH VIN = 5.5V 2 μA Over Temperature Protection(5) TOTP 155 °C I2C Interface(5) Interface complies with slave mode I2C interface as described by Philips I2C speciﬁ cation version 2.1 dated January, 2000. Digital Input Voltage VB-IL 0.4 V VB-IH 1.6 V SDA Output Low Level I DIN (SDA) ≤ 3mA 0.4 V Digital Input Current I B-IN -0.2 0.2 μA Schmitt Trigger Input Hysteresis V HYS 0.1 V Maximum Glitch Pulse Rejection t SP 50 ns I/O Pin Capacitance C IN 10 pF I2C Timing Clock Frequency f SCL 400 440 kHz SCL Low Period t LOW 1.3 μs SCL High Period t HIGH 0.6 μs Data Hold Time t HD_DAT 0 μs Data Setup Time t SU_DAT 100 μs Setup Time for Repeated START Condition tSU_STA 0.6 μs Hold Time for Repeated START Condition tHD_STA 0.6 μs Setup Time for STOP Condition t SU_STO 0.6 μs Bus-Free Time Between STOP and START tBUF 1.3 μs Interface Start-up Time t EN Bus Start-up Time After EN Pin is Pulled High 350 μs Electrical Characteristics (Cont.) Notes: (1) Current step size = 500μA - See Table 1 for other step size options. (2) Outputs are disabled but I2C bus is active (3) Current gain register set to maximum value - see Control Register section for details. (4) Current gain register set to minimum value - see Control Register section for details. (5) Guaranteed by design. © 2006 Semtech Corp. www.semtech.com POWER MANAGEMENT SC620

Electrical Characteristics (Cont.)Pin Conﬁ guration DEVICE PACKAGE (1) SC620ULTRT(2)(1) (1) MLPQ-UT-16 3×3(2) SC620EVB Evaluation Board

Ordering Information

MLPQ-UT-16: 3×3 16 LEAD Notes: (1) Available in tape and reel only. A reel contains 3,000 devices. (2) Available in lead-free package only. Device is WEEE and RoHS compliant. TOP VIEW 16 15 14 13 5678 T GND GNDGND GND VIN EN SCL SDA ILED1 ILED2 ILED3 ILED4 ILED8 ILED7 ILED6 ILED5 Marking Information 620 yyww xxxx yy = two digit year of manufacture ww = two digit week of manufacture xxxx = lot number © 2006 Semtech Corp. www.semtech.com POWER MANAGEMENT SC620

Pin # Pin Name Pin Function

1 GND Ground

2 VIN Input voltage supply

3 EN Enable input - active high

4 GND Ground

5 ILED1 Current sink input for LED 1

6 ILED2 Current sink input for LED 2

7 ILED3 Current sink input for LED 3

8 ILED4 Current sink input for LED 4

9 GND Ground

10 SDA I

2C serial data pin (bi-directional)

11 SCL I 2C clock input

12 GND Ground

13 ILED5 Current sink input for LED 5

14 ILED6 Current sink input for LED 6

15 ILED7 Current sink input for LED 7

16 ILED8 Current sink input for LED 8

The SC620 includes eight (8) independently controlled cur- rent sinks designed to control LED backlighting for mobile phones and other battery-operated handheld devices. As LED forward voltages decrease for white, blue, and other colored LEDs, there is less need for voltage boosting de- vices for powering backlight and indicator LEDs. In such systems where there is a ﬁ xed supply voltage large enough to supply the LEDs or where the LEDs can be powered over the entire battery range, the SC620 provides a simple low- cost driver alternative to charge pump or inductor-based switching boost converters. Current Sink Design Each current sink is designed for a pin voltage range be- tween 150mV and V IN - 1.5V. This feature allows the system to operate backlight LEDs with constant current without interference caused by blinking indicator LEDs or driving LEDs with various forward voltages and currents. Protection Circuitry The SC620 contains protection circuitry that prevents the device from operating in an unspeci ﬁ ed state. These features are: Under-voltage Lockout Protection, Over-tem- perature Protection and Short-circuit Protection. Under-Voltage Lockout An Under-voltage Lockout Protection (UVLO) circuit disables the device in the event that the input voltage falls too low. UVLO typically occurs at 2V. Hysteresis is provided to pre- vent chatter. Short-Circuit Protection The output sink pins ILED1 through ILED8 are protected against shorting to V IN, protecting the SC620 from damage in the event of a shorted LED. The source lead of each sink is connected to ground, so the output sink pins do not require protection against being externally shorted to ground, as this would result in zero potential across the sink device. Over-Temperature Protection The Over-temperature Protection circuit helps prevent the device from overheating and experiencing a catastrophic failure. When the junction temperature exceeds 155°C, the device is disabled and remains disabled until the junction temperature drops by the hysteresis value. Layout Considerations The MLPQ-UT-16 package has a thermal die attach pad located at the center. This pad must be connected to the ground plane through multiple vias as shown (illustration not to scale). For low noise, four ground pins are located at the corner pins 1, 4, 9 and 12. Connect each of the ground pins di- rectly to the ground plane as shown. The layout is otherwise quite simple and requires very few components in addition to the LEDs that it will drive. A 1μF decoupling capacitor at VIN is required. Place this capacitor near pin 2, and ground it close to the SC620 as shown. SCL VIN CIN SC620 GND GND ILED1 ILED2 ILED3 ILED4 ILED5 ILED6 ILED7 ILED8 SDA GND GND GND EN Ground plane © 2006 Semtech Corp. www.semtech.com POWER MANAGEMENT SC620

(1) Default value is the register contents immediately following a high transition at the enable pin. SC620 Slave Address Following a start condition, the bus master outputs the ad- dress of the slave device. The 7 bit slave address for the SC620 is 1110 000x. The eighth bit is the data direction bit and also the least signiﬁ cant bit (LSB). 0xE0 is used for a write operation, and 0xE1 is used for a read operation. DEVICE ADDRESS R/W Dimming Control Register Description The dimming control registers set the multiplier used to determine the absolute current setting. Current setting for each current sink is determined by multiplying the cur- rent step size (as described in Table 1) by the decimal multiplier in each dimming control register. For example, if the current step size is set to 500 μA and the L1 Dim- ming Control Register bits (L1_5 through L1_0) are set to 010100 (20 decimal), then the output current for ILED1 is set to 20 x 500 μA = 10mA. Note that the maximum current setting occurs when the dimming control register bits are set to 110010 (50 decimal) - any bit combination larger than this one will default to the maximum setting. Register Map Address D7 D6 D5 D4 D3 D2 D1 D0 Description Default (1) 00H L8_EN 1 = on 0 = off L7_EN 1 = on 0 = off L6_EN 1 = on 0 = off L5_EN 1 = on 0 = off L4_EN 1 = on 0 = off L3_EN 1 = on 0 = off L2_EN 1 = on 0 = off L1_EN 1 = on 0 = off LED on/off control 00H 01H X X L1_5 L1_4 L1_3 L1_2 L1_1 L1_0 LED1 dimming control 01H 02H X X L2_5 L2_4 L2_3 L2_2 L2_1 L2_0 LED2 dimming control 01H 03H X X L3_5 L3_4 L3_3 L3_2 L3_1 L3_0 LED3 dimming control 01H 04H X X L4_5 L4_4 L4_3 L4_2 L4_1 L4_0 LED4 dimming control 01H 05H X X L5_5 L5_4 L5_3 L5_2 L5_1 L5_0 LED5 dimming control 01H 06H X X L6_5 L6_4 L6_3 L6_2 L6_1 L6_0 LED6 dimming control 01H 07H X X L7_5 L7_4 L7_3 L7_2 L7_1 L7_0 LED7 dimming control 01H 08H X X L8_5 L8_4 L8_3 L8_2 L8_1 L8_0 LED8 dimming control 01H 09H X X X X G4 G3 G2 G1 gain register 08H Table 1 - Gain Setting Values (default = 1000) G4 G3 G2 G1 Current Step Size (μA) 0000 31.25 0001 62.5 0010 93.75 0011 1 2 5 0100 156.25 0101 187.5 0110 218.75 0111 2 5 0 1000 281.25 1001 312.5 1010 343.75 1011 3 7 5 1100 406.25 1101 437.5 1110 468.75 1111 5 0 0 © 2006 Semtech Corp. www.semtech.com POWER MANAGEMENT SC620

The I2C General Speciﬁ cation The SC620 is a read-write slave-mode I2C device and com- plies with the Philips I2C standard Version 2.1 dated Janu- ary, 2000. The SC620 has eight user-accessible internal 8-bit registers. While there is no auto increment/decrement capability in the SC620 I 2C logic, a tight software loop can be designed to randomly access the next register indepen- dent of which register you begin accessing. The start and stop commands frame the data-packet and the repeat start condition is allowed if necessary. SC620 Limitations to the I 2C Speciﬁ cations Seven bit addressing is used and ten bit addressing is not allowed. Any general call address will be ignored by the SC620. The SC620 is not CBUS compatible. The SC620 can operate in standard mode (100kbit/s) or fast mode (400kbit/s). Supported Formats: Direct Format - Write The simplest format for an I 2C write is Direct Format. After the start condition [S], the slave address is sent, followed by an eighth bit indicating a write. The SC620 I 2C then acknowledges that it is being addressed, and the master responds with an 8 bit data byte consisting of the register address. The slave acknowledges and the master sends the appropriate 8 bit data byte. Once again the slave ac- knowledges and the master terminates the transfer with the stop condition [P]. Using the I2C Serial Port Combined Format - Read After the start condition [S], the slave address is sent, fol- lowed by an eighth bit indicating a write. The SC620 I then acknowledges that it is being addressed, and the master responds with an 8 bit data byte consisting of the register address. The slave acknowledges and the master sends the repeated start condition [Sr]. Once again, the slave address is sent, followed by an eighth bit indicating a read. The slave responds with an acknowledge and the previously addressed 8 bit data byte; the master then sends a non-acknowledge (NACK). Finally, the master terminates the transfer with the stop condition [P]. Stop Separated Reads Stop separated reads can also be used. This format al- lows a master to set up the register address pointer for a read and return to that slave at a later time to read the data. In this format the slave address followed by a write command are sent after a start [S] condition. The SC620 then acknowledges it is being addressed, and the master responds with the 8-bit register address. The master sends a stop or restart condition and may then address another slave. After performing other tasks, the master can send a start or restart condition to the SC620 with a read com- mand. The SC620 acknowledges this request and returns the data from the register location that had previously been set up. © 2006 Semtech Corp. www.semtech.com POWER MANAGEMENT SC620

Slave Address Register Address DataS W A AA P S: Start Condition Slave Address: 7 bit W: Write = ‘0’ Register Address: 8 bit A: Acknowledge (sent by slave) Data: 8 bit P: Stop condition I 2C Direct Format - Write Slave Address Register Address Slave Address Data NACKS W A A Sr R A P S: Start Condition Slave Address: 7 bit W: Write = ‘0’ Register Address: 8 bit R: Read = ‘1’ Data: 8 bit A: Acknowledge (sent by slave) NACK: Non-Acknowledge (sent by master) Sr: Repeated Start Condition P: Stop condition I 2C Combined Format - Read Using the I2C Serial Port (Cont.) Slave Address Register Address Slave Address B Data NACKS W A A S/Sr R A PP Slave Address AS S: Start Condition Slave Address: 7 bit W: Write = ‘0’ Register Address: 8 bit R: Read = ‘1’ Data: 8 bit A: Acknowledge (sent by slave) NACK: Non-Acknowledge (sent by master) Sr: Repeated Start Condition P: Stop condition I2C Stop Separated Format - Read Register Address Setup Access Master Addresses other Slaves Register Read Access © 2006 Semtech Corp. www.semtech.com POWER MANAGEMENT SC620

Low Current Settings with Anode = VIN Low Current Settings with Anode = 5V Mid Current Settings with Anode = VIN Mid Current Settings with Anode = 5V High Current Settings with Anode = VIN High Current Settings with Anode = 5V 100 200 300 400 500 600 2.5 3 3.5 4 4.5 5 5.5 LED Current [μA] - - -Boundary of cathode = 150mV 500μA,VF = 2.80V Anode supply = VIN VIN [V] 250μA,VF = 2.73V 125μA,VF = 2.68V 31.25μA,VF = 2.59V LED Current [mA] Anode supply = VIN 15mA,VF = 3.27V VIN [V] 10mA,VF = 3.20V 5mA,VF = 3.08V - - - Boundary at cathode = 150mV LED Current [mA] - - - Boundary at cathode = 150mV Anode supply = VIN 31.5mA,VF = 3.42V VIN [V] 25mA,VF = 3.37V 15mA,VF = 3.27V 10mA,VF = 3.20V 100 200 300 400 500 600 VIN [V] LED Current [μA] Anode supply = 5V 500μA,VF = 2.79V - - -Boundary of cathode at VIN-1.5V 250μA,VF = 2.73V 125μA,VF = 2.68V 31.25μA,VF = 2.59V LED Current [mA] Anode supply = 5V 15mA,VF = 3.26V VIN [V] - - -Boundary of cathode at VIN-1.5V 10mA,VF = 3.19V 5mA,VF = 3.08V LED Current [mA] Anode supply = 5V 25mA,VF = 3.35V - - -Boundary of cathode at VIN-1.5V VIN [V] 31.5mA,VF = 3.39V 15mA,VF = 3.26V 10mA,VF = 3.19V © 2006 Semtech Corp. www.semtech.com POWER MANAGEMENT SC620

Sub Panel Color/R/G/B LEDs 1μF SCL SDA EN Main Panel LED Backlighting Main Backlight Plus Sub-panel Backlight Plus Single RGB LED Example Circuit This application example uses the SC620 to drive a main display, a sub-panel display and an RGB LED. Independent outputs allow these functions to be supported simultaniously at different intensities. The VIN supply is typically single cell Li-Ion or 5.0V. VIN supply and LED anode voltage may be from different sources. The operating voltage limit of [VIN - 1.5V] at the sink pins must be observed to achieve the speciﬁ ed accuracy of the device. © 2006 Semtech Corp. www.semtech.com POWER MANAGEMENT SC620

Application Examples (Cont.) SC620 VIN2 SCL11 SDA10 EN3 GND1 GND4 GND9 GND12 ILED1 5 ILED2 6 ILED3 7 ILED4 8 ILED6 14 ILED8 16 ILED5 13 VLOGIC 1μF SCL SDA EN Main Panel LED Backlighting Lens Focusing VBAT = 2.7V to 5.5V VBAT Voice Coil ILED7 15 GPODigital Output Expander Backlighting Three LEDs of Any Color Combination Plus Lens Voice Coil Drive and One GPO Example Circuit This application example uses the SC620 to drive 3 backlight LEDs, plus a voice coil actuator for lens auto-focus and one open-drain digital output. Independent outputs allow these functions to be supported simultaneously. The VIN supply is typically single cell Li-Ion or 5.0V. VIN and the LED anode voltage may be supplied by different sources. The operating voltage limit of [VIN - 1.5V] at the sink pins must be observed to achieve the speci ﬁ ed accuracy of the device. © 2006 Semtech Corp. www.semtech.com POWER MANAGEMENT SC620

Application Examples (Cont.) Backlighting with Series Connected LEDs connected to a Boosted Output Voltage SC620 VIN2 SCL11 SDA10 EN3 GND1 GND4 GND9 GND12 ILED1 5 ILED2 6 ILED3 7 ILED4 8 ILED6 14 ILED7 15 ILED8 16 ILED5 13 1μF SCL SDA EN LED Backlighting R2 = (3/7)*(R1) Limit SC620 sink pins to < [VIN – 1.5] DC/DC Boost Voltage Boost limiting Example Circuit This application example uses the SC620 to drive 32 LEDs in a 4-in-series by 8-in-parallel arrangement. Other arrangements of series and parallel combinations are possible. To prevent the boost voltage from illuminating the LEDs while the current sinks are off, the boost voltage must follow the SC620 in the start-up sequence. The boost voltage must also power-off before the current sinks turn off in the shut-down sequence. Protection diodes are necessary to protect the current sinks from destructive voltage levels produced by the boost voltage supply. The operating voltage limit of [VIN - 1.5V] at the sink pins must be observed to achieve the speciﬁ ed accuracy of the device. © 2006 Semtech Corp. www.semtech.com POWER MANAGEMENT SC620

Outline Drawing - MLPQ-UT-16 3x3 COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS.2. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).1. INCHES DIMENSIONS NOM e bbb aaa DIM N L E MIN D A MILLIMETERS MAXMINMAX NOM E BD e/2 e bxN N PIN 1 INDICATOR (LASER MARK) C SEATING PLANE LxN E/2 D/2 A NOTES: bbb C A B aaa C .003 .061 .067 .000 .018 (.006) 0.08 .071 1.55 .024 .002 0.00 0.45 1.801.70 0.05 0.60 (0.1524) .004 0.10 1.55 2.90 1.70 1.80 3.00 3.10 0.50 BSC.020 BSC .122.118.114 .071.067.061 A © 2006 Semtech Corp. www.semtech.com POWER MANAGEMENT SC620

Land Pattern - MLPQ-UT-16 3x3 Semtech Corporation Power Management Products Division

200 Flynn Road, Camarillo, CA 93012

Phone: (805) 498-2111 Fax: (805) 498-3804 Contact Information www.semtech.com © 2006 Semtech Corp. www.semtech.com POWER MANAGEMENT SC620 C Z P Y X G H .146 .020 .012 .031 .083 .067 3.70 0.30 0.80 0.50 1.70 2.10 DIM (2.90) MILLIMETERS DIMENSIONS (.114) INCHES K .067 1.70 FAILURE TO DO SO MAY COMPROMISE THE THERMAL AND/OR FUNCTIONAL PERFORMANCE OF THE DEVICE. SHALL BE CONNECTED TO A SYSTEM GROUND PLANE. THERMAL VIAS IN THE LAND PATTERN OF THE EXPOSED PAD2. P X H K(C) R R .006 0.15Y G Z THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. NOTES:

Product Information

SC620EVB specifications and overview.

Summary

Octal LED Driver, General Purpose Current Sink with Serial Interface

Description

The SC620 is a multi-purpose LED driver with eight identical, independently controlled current sinks. Each current sink can drive an LED by connecting the LED’s anode to the system power supply and the cathode to the current sink input pin. Any combination of outputs can be enabled or disabled for optimal design flexibility.

Source title SC620EVB Datasheet(PDF) - Semtech Corporation

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