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Octal LED Driver, General Purpose Current Sink with Serial Interface
POWER MANAGEMENT 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. In addition to the individual current settings, the SC620 employs an adjustable global current gain setting register to allow the current setting step size to vary from 31.25A to 500A, giving the designer a wide range of options for LED variation and dimming functions. The maximum output is also scaled by this step size, with a maximum of 25mA at the highest step setting. Multi-colored and white LEDs with different forward voltages can be driven using the same SC620 due to its floating cathode technology. This feature allows each output pin to vary in voltage from 150mV to VIN - 1.5V. All current control is done via an I2C interface bus. Only a single input bypass capacitor is required - no other external resistors or capacitors are needed. The 3mm x 3mm MLPQ package and minimal support components make the SC620 an ideal solution for low-cost, area-conscious backlighting designs.
SC620
Features
Eight identical current drivers with independent control Wide current setting range - 31.25A to 25mA 3% current matching, 5% accuracy I2C interface for microprocessor control I2C slave address 1110 000x Less than 1A quiescent current in shutdown Low dropout voltage: 150mV Over-temperature protection MLPQ-UT-16 package (3mm x 3mm) Ultra-thin 0.6mm maximum package height Fully WEEE and RoHS compliant
Applications
LCD backlighting LED driver Multicolor and RGB LED driver General purpose current sink array General purpose digital output (open-drain) expander Auto-focus voice-coil driver
Typical Application Circuit
LED Backlighting
Main Panel Sub Panel Color/R/G/B LEDs
Battery
1F
2
SCL SDA EN
VIN SCL SDA EN GND GND GND GND
SC620
ILED1 ILED2 ILED3 ILED4 ILED5 ILED6
5 6 7 8 13 14
11 10 3 1 4 9 12
ILED7
ILED8
15
16
January 16, 2007
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SC620
POWER MANAGEMENT Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied.
Parameter Input Supply Voltage Pin Voltage - All Other Pins Short Circuit Duration - All Outputs Operating Ambient Temperature Range Operating Junction Temperature Range Storage Temperature Peak IR Reflow Temperature Thermal Resistance - Junction to Ambient(1) ESD Protection Level(2)
Symbol VIN
Maximum -0.3 to +6.0 -0.3 to VIN+0.3
Units V V s C C C C C/W kV
tSC TA TJ TSTG TPKG JA VESD
Indefinite -40 to +85 -40 to +150 -65 to +150 260 39 2
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
Electrical Characteristics
Unless otherwise noted, TA = +25C for Typ, -40C to 85C for Min and Max, VIN = 2.7V to 5.5V, CIN = 1F, VF 1.5V
Parameter Maximum LED Current Setting(1)
Symbol ILEDn
Condition
Min
Typ 25
Max
Units mA
LED Current Setting Accuracy
(1)
ILEDn
0.5mA ILEDn 5mA, TA = 25C 5mA < ILEDn 25mA, VF = 3.4V, VILEDn = 2V, TA = 25C 5mA < ILEDn 25mA, TA = 25C 0.5mA ILEDn 5mA, TA = 25C 5mA < ILEDn 25mA, TA = 25C ILEDn = 25mA EN = GND Normal Mode(3)
-250 -5 -2 -150 -3
250 5 2 150 3 150 0.1 500 31.25 60 720 4.5 1
A % %/V A % mV A A A A A mA
Load Regulation
ILEDn/ VF
LED Current Matching Accuracy
(1)
ILED-to-LED
Dropout Voltage Shutdown Current Current Step Size
VDO ISHDN ISTEP
Low-Current Mode(4) Standby: EN = VIN, LED1-8 disabled(2)
Quiescent Current
IQ
EN = VIN, ILED1-8 = 1.968mA(4) EN = VIN, ILED1-8 = 25mA(3)
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SC620
POWER MANAGEMENT Electrical Characteristics (Cont.)
Parameter Current Sink Turn-on Time Current Sink Turn-off Time EN Input High Threshold EN Input Low Threshold EN Input High Current Over Temperature Protection(5) I2C Interface(5)
Interface complies with slave mode I2C interface as described by Philips I2C specification version 2.1 dated January, 2000.
Symbol tON tOFF VIH VIL IIH TOTP
Condition from 0 to 95% of target from 90% to 10% of set value VIN = 5.5V VIN = 2.7V VIN = 5.5V
Min
Typ
Max 1
Units ms s V
1 1.6 0.4 2 155
V A C
Digital Input Voltage SDA Output Low Level Digital Input Current Schmitt Trigger Input Hysteresis Maximum Glitch Pulse Rejection I/O Pin Capacitance I2C Timing Clock Frequency SCL Low Period SCL High Period Data Hold Time Data Setup Time Setup Time for Repeated START Condition Hold Time for Repeated START Condition Setup Time for STOP Condition Bus-Free Time Between STOP and START Interface Start-up Time
VB-IL VB-IH IDIN (SDA) 3mA IB-IN VHYS tSP CIN -0.2 0.1 50 10 1.6
0.4
V V
0.4 0.2
V A V ns pF
fSCL tLOW tHIGH tHD_DAT tSU_DAT tSU_STA tHD_STA tSU_STO tBUF tEN Bus Start-up Time After EN Pin is Pulled High 1.3 0.6 0 100 0.6 0.6 0.6 1.3
400
440
kHz s s s s s s s s
350
s
Notes: (1) Current step size = 500A - 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.
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SC620
POWER MANAGEMENT Electricalguration Pin Confi Characteristics (Cont.)
ILED8 ILED7 ILED6 ILED5
Ordering Information
DEVICE SC620ULTRT((1)
2)(1)
PACKAGE(
1)
16 GND VIN EN GND 1 2 3 4 5
ILED1
15
14
13 12 11 10 GND SCL SDA GND
MLPQ-UT-16 3x3(2) Evaluation Board
TOP VIEW
SC620EVB
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.
T 6
ILED2
9 7
ILED3
8
ILED4
MLPQ-UT-16: 3x3 16 LEAD
Marking Information
620 yyww xxxx
yy = two digit year of manufacture ww = two digit week of manufacture xxxx = lot number
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SC620
POWER MANAGEMENT Block Diagram
VIN VIN DAC 5
VIN
ILED1
2
Voltage Reference
1 DAC 6 VIN
GND
ILED2
VIN DAC 7
EN SCL SDA
3 11 10
Digital Interface and Control Registers
DAC
ILED3
VIN
8
ILED4
VIN DAC 13
ILED5
VIN DAC 14
ILED6
VIN DAC 15
ILED7
VIN DAC 16
ILED8
SC620
4 9 12
GND
GND
GND
Figure 1 - SC620 Block Diagram with I2C Interface and Eight LED Current Sinks
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SC620
POWER MANAGEMENT Pin Descriptions
Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 T Pin Name GND VIN EN GND ILED1 ILED2 ILED3 ILED4 GND SDA SCL GND ILED5 ILED6 ILED7 ILED8 Thermal Pad Pin Function Ground Input voltage supply Enable input - active high Ground Current sink input for LED 1 Current sink input for LED 2 Current sink input for LED 3 Current sink input for LED 4 Ground I2C serial data pin (bi-directional) I2C clock input Ground Current sink input for LED 5 Current sink input for LED 6 Current sink input for LED 7 Current sink input for LED 8 Thermal pad for heatsinking purposes. Connect to ground plane using multiple vias. Not connected internally.
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SC620
POWER MANAGEMENT Applications Information
General Description The SC620 includes eight (8) independently controlled current 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 devices for powering backlight and indicator LEDs. In such systems where there is a fixed 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 lowcost driver alternative to charge pump or inductor-based switching boost converters. Current Sink Design Each current sink is designed for a pin voltage range between 150mV and VIN - 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 unspecified state. These features are: Under-voltage Lockout Protection, Over-temperature 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 prevent chatter. Short-Circuit Protection The output sink pins ILED1 through ILED8 are protected against shorting to VIN, 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 155C, 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).
ILED7 ILED6 ILED5
ILED8
Ground plane
SC620
GND GND
CIN
EN GND
SCL SDA
VIN
ILED1
For low noise, four ground pins are located at the corner pins 1, 4, 9 and 12. Connect each of the ground pins directly 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 1F decoupling capacitor at VIN is required. Place this capacitor near pin 2, and ground it close to the SC620 as shown.
(c) 2006 Semtech Corp. 7
ILED2 ILED3 ILED4
GND
GND
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SC620
POWER MANAGEMENT Register Map
Address 00H 01H 02H 03H 04H 05H 06H 07H 08H 09H D7 L8_EN
1 = on 0 = off
D6 L7_EN
1 = on 0 = off
D5 L6_EN
1 = on 0 = off
D4 L5_EN
1 = on 0 = off
D3 L4_EN
1 = on 0 = off
D2 L3_EN
1 = on 0 = off
D1 L2_EN
1 = on 0 = off
D0 L1_EN
1 = on 0 = off
Description LED on/off control LED1 dimming control LED2 dimming control LED3 dimming control LED4 dimming control LED5 dimming control LED6 dimming control LED7 dimming control LED8 dimming control gain register
Default (1) 00H 01H 01H 01H 01H 01H 01H 01H 01H 08H
X X X X X X X X X
X X X X X X X X X
L1_5 L2_5 L3_5 L4_5 L5_5 L6_5 L7_5 L8_5 X
L1_4 L2_4 L3_4 L4_4 L5_4 L6_4 L7_4 L8_4 X
L1_3 L2_3 L3_3 L4_3 L5_3 L6_3 L7_3 L8_3 G4
L1_2 L2_2 L3_2 L4_2 L5_2 L6_2 L7_2 L8_2 G3
L1_1 L2_1 L3_1 L4_1 L5_1 L6_1 L7_1 L8_1 G2
L1_0 L2_0 L3_0 L4_0 L5_0 L6_0 L7_0 L8_0 G1
(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 address 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 significant bit (LSB). 0xE0 is used for a write operation, and 0xE1 is used for a read operation.
DEVICE ADDRESS 1 1 1 0 0 0 0 R/W 1/0
Table 1 - Gain Setting Values (default = 1000)
G4 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 G3 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 G2 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 G1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 Current Step Size (A) 31.25 62.5 93.75 125 156.25 187.5 218.75 250 281.25 312.5 343.75 375 406.25 437.5 468.75 500
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 current 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 500A and the L1 Dimming 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 500A = 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.
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SC620
POWER MANAGEMENT Using the I2C Serial Port
The I2C General Specification The SC620 is a read-write slave-mode I2C device and complies with the Philips I2C standard Version 2.1 dated January, 2000. The SC620 has eight user-accessible internal 8-bit registers. While there is no auto increment/decrement capability in the SC620 I2C logic, a tight software loop can be designed to randomly access the next register independent 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 I2C Specifications 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 I2C write is Direct Format. After the start condition [S], the slave address is sent, followed by an eighth bit indicating a write. The SC620 I2C 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 acknowledges and the master terminates the transfer with the stop condition [P]. Combined Format - Read After the start condition [S], the slave address is sent, followed by an eighth bit indicating a write. The SC620 I2C 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 allows 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 command. The SC620 acknowledges this request and returns the data from the register location that had previously been set up.
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SC620
POWER MANAGEMENT Using the I2C Serial Port (Cont.)
I2C Direct Format - Write
S
Slave Address
W A Register Address
A
Data
AP
S: Start Condition W: Write = `0' A: Acknowledge (sent by slave) P: Stop condition
Slave Address: 7 bit Register Address: 8 bit Data: 8 bit
I2C Stop Separated Format - Read Register Address Setup Access Master Addresses other Slaves Register Read Access S/Sr Slave Address A R A Data NACK P
S Slave Address W A Register Address A P S Slave Address B S: Start Condition W: Write = `0' R: Read = `1' A: Acknowledge (sent by slave) NACK: Non-Acknowledge (sent by master) Sr: Repeated Start Condition P: Stop condition Slave Address: 7 bit Register Address: 8 bit Data: 8 bit
I2C Combined Format - Read
S
Slave Address
W A Register Address
A Sr Slave Address R
A
Data
NACK
P
S: Start Condition W: Write = `0' R: Read = `1' A: Acknowledge (sent by slave) NACK: Non-Acknowledge (sent by master) Sr: Repeated Start Condition P: Stop condition
Slave Address: 7 bit Register Address: 8 bit Data: 8 bit
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SC620
POWER MANAGEMENT Typical Characteristics
600
Low Current Settings with Anode = VIN
Anode supply = VIN 500A,VF = 2.80V
Low Current Settings with Anode = 5V
600 500A,VF = 2.79V 500 - - -Boundary of cathode at VIN-1.5V 400 Anode supply = 5V
500
LED Current [A]
400
- - -Boundary of cathode = 150mV
300
LED Current [A]
250A,VF = 2.73V
300
250A,VF = 2.73V
200 125A,VF = 2.68V 100 31.25A,VF = 2.59V 0 2.5 3 3.5 4 4.5 5 5.5
200 125A,VF = 2.68V 100 31.25A,VF = 2.59V 0 3.5 3.75 4 4.25 4.5 4.75 5 5.25 5.5
VIN [V]
VIN [V]
Mid Current Settings with Anode = VIN
16 15mA,VF = 3.27V 14 Anode supply = VIN
Mid Current Settings with Anode = 5V
16 15mA,VF = 3.26V 14 Anode supply = 5V
LED Current [mA]
LED Current [mA]
12 10mA,VF = 3.20V
12 10mA,VF = 3.19V
10
10
8
- - - Boundary at cathode = 150mV
8
- - -Boundary of cathode at VIN-1.5V
6
5mA,VF = 3.08V
6
5mA,VF = 3.08V
4
3 3.25 3.5 3.75 4 4.25 4.5 4.75 5 5.25 5.5
4 3
3.25
3.5
3.75
4
4.25
4.5
4.75
5
5.25
5.5
VIN [V]
VIN [V]
High Current Settings with Anode = VIN
33 30 27 25mA,VF = 3.37V 24 21 31.5mA,VF = 3.42V Anode supply = VIN
33 29
High Current Settings with Anode = 5V
31.5mA,VF = 3.39V
Anode supply = 5V 25mA,VF = 3.35V - - -Boundary of cathode at VIN-1.5V
LED Current [mA]
LED Current [mA]
25
21
- - - Boundary at cathode = 150mV
18 15 12 9 3.25 15mA,VF = 3.27V
17 15mA,VF = 3.26V 13
10mA,VF = 3.20V 3.5 3.75 4 4.25 4.5 4.75 5 5.25 5.5
9 3 3.25
10mA,VF = 3.19V 3.5 3.75 4 4.25 4.5 4.75 5 5.25 5.5
VIN [V]
VIN [V]
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SC620
POWER MANAGEMENT Application Examples
Main Backlight Plus Sub-panel Backlight Plus Single RGB LED
LED Backlighting
Main Panel Sub Panel Color/R/G/B LEDs
Battery
1F
2
SCL SDA EN
VIN SCL SDA EN GND GND GND GND
SC620
ILED1 ILED2 ILED3 ILED4 ILED5 ILED6
5 6 7 8 13 14
11 10 3 1 4 9 12
ILED7
ILED8
15
16
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 specified accuracy of the device.
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SC620
POWER MANAGEMENT Application Examples (Cont.)
Backlighting Three LEDs of Any Color Combination Plus Lens Voice Coil Drive and One GPO
VBAT = 2.7V to 5.5V
LED Backlighting
Main Panel
VLOGIC
Lens Focusing
VBAT Voice Coil
1F 2
SCL SDA EN
VIN SCL SDA EN GND GND GND GND
SC620
ILED1 ILED2 ILED3 ILED4 ILED5 ILED6 ILED7 ILED8
5 6 7 8 13 14 15 16
11 10 3 1 4 9 12
Digital Output Expander
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 specified accuracy of the device.
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SC620
POWER MANAGEMENT Application Examples (Cont.)
Backlighting with Series Connected LEDs connected to a Boosted Output Voltage
LED Backlighting
DC/DC Boost Voltage
Boost limiting
R2 = (3/7)*(R1)
+ -
R1 Limit SC620 sink pins to < [VIN - 1.5]
5V
2
SCL
VIN SCL SDA EN GND GND GND GND
SC620
ILED1 ILED2 ILED3 ILED4 ILED5 ILED6
5 6 7 8 13 14
11 10 3 1 4 9 12
1F
SDA EN
ILED7
ILED8
15
16
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.
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The operating voltage limit of [VIN - 1.5V] at the sink pins must be observed to achieve the specified accuracy of the device.
SC620
POWER MANAGEMENT Outline Drawing - MLPQ-UT-16 3x3
A
D
B
DIMENSIONS INCHES MILLIMETERS DIM MIN NOM MAX MIN NOM MAX
A A1 A2 b D D1 E E1 e L N aaa bbb .024 .002 (.006) .007 .009 .012 .114 .118 .122 .061 .067 .071 .114 .118 .122 .061 .067 .071 .020 BSC .012 .016 .020 16 .003 .004 .018 .000 0.60 0.05 (0.1524) 0.18 0.23 0.30 2.90 3.00 3.10 1.55 1.70 1.80 2.90 3.00 3.10 1.55 1.70 1.80 0.50 BSC 0.30 0.40 0.50 16 0.08 0.10 0.45 0.00
PIN 1 INDICATOR (LASER MARK)
E
A2 A aaa C A1 C D1 e/2 LxN E/2 E1
2 1 N
SEATING PLANE
e bxN D/2
NOTES: 1. 2. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS.
bbb
CAB
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SC620
POWER MANAGEMENT Land Pattern - MLPQ-UT-16 3x3
H R
DIM
(C) K G Z
DIMENSIONS INCHES MILLIMETERS
(.114) .083 .067 .067 .020 .006 .012 .031 .146 (2.90) 2.10 1.70 1.70 0.50 0.15 0.30 0.80 3.70
Y
X P
NOTES: 1.
C G H K P R X Y Z
THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET.
2. THERMAL VIAS IN THE LAND PATTERN OF THE EXPOSED PAD SHALL BE CONNECTED TO A SYSTEM GROUND PLANE. FAILURE TO DO SO MAY COMPROMISE THE THERMAL AND/OR FUNCTIONAL PERFORMANCE OF THE DEVICE.
Contact Information
Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805) 498-2111 Fax: (805) 498-3804
www.semtech.com
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