SEMTECH SC620EVB

SC620
Octal LED Driver, General Purpose
Current Sink with Serial Interface
POWER MANAGEMENT
Features
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.
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Wide current setting range — 31.25μA to 25mA
Eight identical current drivers with independent
control
5% current matching, 7% accuracy
I2C interface for microprocessor control
I2C slave address 1110 000x
Less than 1μA 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
„
The SC620 also employs an adjustable global current gain
setting register to allow the current setting step size to
vary from 31.25μA to 500μA. This provides 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 programmed using 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.
Typical Application Circuit
LED Backlighting
Main Panel
Battery
1μF
IN
Color/R/G/B LEDs
ILED1
SCL
SCL
ILED2
SDA
SDA
ILED3
EN
ILED4
GND
ILED5
GND
ILED6
GND
ILED7
GND
ILED8
EN
April 22, 2009
SC620
Sub Panel
© 2009 Semtech Corporation
1
SC620
ILED6
ILED5
Evaluation Board
ILED7
MLPQ-UT-16 3×3(2)
15
14
13
SC620EVB
12
GND
2
11
SCL
EN
3
10
SDA
GND
4
9
GND
TOP VIEW
T
ILED1
5
6
7
8
ILED4
IN
Package
16
ILED3
1
Device
SC620ULTRT(1)(2)
ILED2
GND
Ordering Information
ILED8
Pin Configuration
Notes:
(1) Available in tape and reel only. A reel contains 3,000 devices.
(2) Lead-free package only. Device is WEEE and RoHS compliant.
MLPQ-UT-16; 3x3, 16 LEAD
θJA = 39°C/W
Marking Information
620
yyww
xxxx
yy = two digit year of manufacture
ww = two digit week of manufacture
xxxx = lot number
2
SC620
Absolute Maximum Ratings
Recommended Operating Conditions
IN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0
Ambient Temperature Range (°C) . . . . . . . . . . . . -40 to +85
Pin Voltage — All Other Pins (V) . . . . . . . . . -0.3 to VIN + 0.3
ESD Protection Level(1) (kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Thermal Information
Thermal Resistance, Junction to Ambient(2) (°C/W) . . . . 39
Operating Junction Temperature (°C) . . . . . . . . -40 to +150
Storage Temperature Range (°C) . . . . . . . . . . . -65 to +150
Peak IR Reflow Temperature (10s to 30s) (°C) . . . . . . . +260
Exceeding the above specifications may result in permanent damage to the device or device malfunction. Operation outside of the parameters
specified in the Electrical Characteristics section is not recommended.
NOTES:
(1) Tested according to JEDEC standard JESD22-A114-B.
(2) Calculated from package in still air, mounted to 3 x 4.5 (in), 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards.
Electrical Characteristics
Unless otherwise noted, TA = +25°C for Typ, -40ºC to 85°C for Min and Max, VIN = 2.7V to 5.5V, CIN = 1μF, ΔVF ≤ 1.5V
Parameter
Symbol
Maximum LED Current Setting(1)
ILEDn
LED Current Setting Accuracy(1)
ΔILEDn
Load Regulation
LED Current Matching Accuracy(1)
ΔILEDn/ ΔVF
Condition
Min
Typ
Max
25
ILEDn = 15mA, VF = 3.4V,
VILEDn = 2V, TA = 25ºC
5mA < ILEDn ≤ 25mA,
TA = 25ºC
Units
mA
-7
+7
%
-2
2
%/V
-5
+5
%
150
mV
1
μA
ILED-to-LED
ILEDn = 15mA, TA = 25ºC
Dropout Voltage
VDO
ILEDn = 25mA
Shutdown Current
ISHDN
EN = GND
0.1
Normal Mode(3)
500
μA
Current Step Size
ISTEP
Low-Current Mode(4)
31.25
μA
Standby: EN = VIN,
60
LED1-8 disabled(2)
Quiescent Current
IQ
μA
EN = VIN, ILED1-8 = 1.968mA(4)
720
μA
EN = VIN, ILED1-8 = 25mA(3)
4.5
mA
3
SC620
Electrical Characteristics (continued)
Parameter
Symbol
Condition
Current Sink Turn-on Time
tON
from 0 to 95% of target
Current Sink Turn-off Time
tOFF
from 90% to 10% of set value
EN Input High Threshold
VIH
VIN = 5.5V
EN Input Low Threshold
VIL
VIN = 2.7V
0.4
V
EN Input High Current
IIH
VIN = 5.5V
2
μA
Over Temperature Protection(5)
Min
Typ
Max
Units
1
ms
1
μs
1.6
TOTP
V
155
°C
I2C Interface(5)
Interface complies with slave mode I2C interface as described by Philips I2C specification version 2.1 dated January, 2000.
VB-IL
0.4
V
Digital Input Voltage
VB-IH
1.6
V
IDIN (SDA) ≤ 3mA
SDA Output Low Level
-0.2
0.4
V
0.2
μA
Digital Input Current
IB-IN
Schmitt Trigger Input Hysteresis
VHYS
0.1
V
Maximum Glitch Pulse Rejection
tSP
50
ns
I/O Pin Capacitance
CIN
10
pF
Clock Frequency
fSCL
400
SCL Low Period
tLOW
1.3
μs
SCL High Period
tHIGH
0.6
μs
Data Hold Time
tHD_DAT
0
μs
Data Setup Time
tSU_DAT
100
ns
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
tSU_STO
0.6
μs
I2C Timing
440
kHz
4
SC620
Electrical Characteristics (continued)
Parameter
Symbol
Condition
Min
Typ
Max
Units
I2C Timing (continued)
Bus-Free Time Between
STOP and START
tBUF
Interface Start-up Time
tEN
1.3
Bus Start-up Time After EN Pin is
Pulled High
μs
350
μs
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.
5
SC620
Typical Characteristics
Low Current Settings with Anode = VIN
600
Low Current Settings with Anode = 5V
Anode supply = VIN
Anode supply = 5V
600
500μA,VF = 2.80V
500μA,VF = 2.79V
500
500
400
400
LED Current (μA)
LED Current (μA)
Boundary of cathode at VIN-1.5V
Boundary of cathode = 150mV
300
250μA,VF = 2.73V
200
300
250μA,VF = 2.73V
200
125μA,VF = 2.68V
125μA,VF = 2.68V
100
100
31.25μA,VF = 2.59V
31.25μA,VF = 2.59V
0
2.5
3
3.5
4
VIN (V)
4.5
5
0
3.5
5.5
Mid Current Settings with Anode = VIN
16
3.75
12
12
LED Current (mA)
LED Current (mA)
14
10mA,VF = 3.20V
Boundary at cathode = 150mV
4
3.25
3.5
3.75
4
4.25
4.5
4.75
5
5.25
4
3
5.5
3.25
3.5
3.75
4
4.25
LED Current (mA)
LED Current (mA)
Boundary at cathode = 150mV
17
15mA,VF = 3.27V
14
20
17
15mA,VF = 3.26V
14
8
4.25
4.5
VIN (V)
5.5
Boundary of cathode at VIN-1.5V
11
10mA,VF = 3.20V
4
5.25
25mA,VF = 3.35V
23
3.75
5
Anode supply = 5V
26
25mA,VF = 3.37V
3.5
4.75
High Current Settings with Anode = 5V
20
8
3.25
4.5
VIN (V)
Anode supply = VIN
11
5.5
5mA,VF = 3.08V
High Current Settings with Anode = VIN
23
5.25
Boundary of cathode at VIN-1.5V
8
VIN (V)
26
5
10mA,VF = 3.19V
10
6
5mA,VF = 3.08V
3
4.75
15mA,VF = 3.26V
14
6
4.5
VIN (V)
Anode supply = 5V
16
15mA,VF = 3.27V
8
4.25
Mid Current Settings with Anode = 5V
Anode supply = VIN
10
4
4.75
5
5.25
5.5
10mA,VF = 3.19V
3
3.25
3.5
3.75
4
4.25
VIN (V)
4.5
4.75
5
5.25
5.5
6
SC620
Typical LED Current Matching
3.5
Typical LED Current Accuracy (25°C)
Gain Register Value = 0Ch
8
6
2.5
-40°C
1.5
4
% Accuracy
85°C
% Matching
All 8 LEDs fall between Max and Min, Gain Register Value = 0Ch
25°C
0.5
-0.5
2
0
Max
-2
Min
-1.5
-4
-2.5
-6
-3.5
0.5
5.5
10.5
15.5
20.5
-8
0.5
25.5
5.5
LED Current (mA)
6
4
4
2
2
% Accuracy
% Accuracy
8
6
Max
-2
All 8 LEDs fall between Max and Min, Gain Register Value = 0Ch
0
Max
-2
-4
-6
-8
0.5
25.5
Min
Min
-4
20.5
Typical LED Current Accuracy (85°C)
All 8 LEDs fall between Max and Min, Gain Register Value = 0Ch
0
15.5
LED Current (mA)
Typical LED Current Accuracy (-40°C)
8
10.5
-6
5.5
10.5
15.5
LED Current (mA)
20.5
25.5
-8
0.5
5.5
10.5
15.5
LED Current (mA)
20.5
25.5
7
SC620
Pin Descriptions
Pin #
Pin Name
Pin Function
1
GND
2
IN
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
I2C serial data pin (bi-directional)
11
SCL
I2C 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
T
Thermal Pad
Ground
Thermal pad for heatsinking purposes. Connect to ground plane using multiple vias. Not connected
internally.
8
SC620
Block Diagram
VIN
VIN
IN
2
GND
1
DAC
5
ILED1
6
ILED2
7
ILED3
8
ILED4
13
ILED5
14
ILED6
15
ILED7
16
ILED8
Voltage
Reference
VIN
DAC
VIN
DAC
EN 3
SCL 11
SDA 10
Digital
Interface
and
Control
Registers
VIN
DAC
VIN
DAC
VIN
DAC
VIN
DAC
VIN
DAC
4
9
12
GND
GND
GND
9
SC620
Applications Information
Layout Considerations
Ground plane
SC620
Current Sink Design
Protection Circuitry
The SC620 contains protection circuitry that prevents
damage from operating in an unspecified state. These
features include:
•
•
•
GND
GND
CIN
SCL
GND
EN
VIN
GND
ILED2
ILED3
ILED4
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.
ILED7
ILED6
ILED5
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).
ILED8
The SC620 includes eight 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 these types of 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 low-cost driver alternative to
charge pump or inductor-based switching boost
converters.
failure. When the junction temperature exceeds 155°C,
the device is disabled and remains disabled until the
junction temperature is reduced.
ILED1
General Description
SDA
GND
Under-voltage Lockout Protection
Over-temperature Protection
Short-circuit Protection
Under-Voltage Lockout
An Under-Voltage Lockout Protection (UVLO) circuit disables the device in the event that the input voltage falls
below the threshold. 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, prevent device 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.
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 simple and requires very few components in
addition to the LEDs that it will drive. A 1μF decoupling
capacitor at the IN pin is required. Place this capacitor
near pin 2, and ground it close to the SC620 as shown.
Over-Temperature Protection
The Over-temperature Protection circuit helps prevent the
device from overheating and experiencing a catastrophic
10
SC620
Applications Information (continued)
Application Circuit Examples
Main Backlight Plus Sub-panel Backlight Plus Single
RGB LED
This 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 simultaneously 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.
LED Backlighting
Main Panel
Battery
1μF
2
SCL
SDA
EN
11
10
3
1
4
9
12
IN
SC620
ILED1
SCL
ILED2
SDA
ILED3
EN
ILED4
GND
ILED5
GND
ILED6
GND
ILED7
GND
ILED8
Sub Panel
Color/R/G/B LEDs
5
6
7
8
13
14
15
16
11
SC620
Applications Information (continued)
Backlighting Three LEDs of Any Color Combination
Plus Lens Voice Coil Drive and One GPO
This 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.
LED Backlighting
VBAT = 2.7V to 5.5V
Main Panel
1μF
2
SCL
SDA
EN
11
10
3
1
4
9
12
IN
SC620
VLOGIC
Lens Focusing
VBAT
Voice
Coil
ILED1
SCL
ILED2
SDA
ILED3
EN
ILED4
GND
ILED5
GND
ILED6
GND
ILED7
GND
ILED8
5
6
7
8
Digital Output Expander
GPO
13
14
15
16
12
SC620
Applications Information (continued)
Backlighting with Series Connected LEDs connected
to a Boosted Output Voltage
This example uses the SC620 to drive 32 LEDs in a 4-inseries 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 may be
necessary to protect the current sinks from destructive
voltage levels produced by the boost voltage supply.
Schottky diodes are shown in the schematic for the
purpose of voltage clamping. These diodes prevent
damage to the current sinks in the event that the sink
turns off while the boost circuit is on.
The operating voltage limit of (VIN - 1.5V) at the sink pins
must be observed to achieve the specified accuracy of the
device.
LED Backlighting
DC/DC Boost Voltage
Boost
limiting
R2 = (3/7)*(R1)
+
-
R1
Limit SC620 sink pins to < [VIN – 1.5]
5V
2
SCL
1μF
SDA
EN
11
10
3
1
4
9
12
IN
SC620
ILED1
SCL
ILED2
SDA
ILED3
EN
ILED4
GND
ILED5
GND
ILED6
GND
ILED7
GND
ILED8
5
6
7
8
13
14
15
16
13
SC620
Register Map
Address
D7
D6
D5
D4
D3
D2
D1
D0
Description
Default (1)
L8_EN
L7_EN
L6_EN
L5_EN
L4_EN
L3_EN
L2_EN
L1_EN
00h
1 = on
0 = off
1 = on
0 = off
1 = on
0 = off
1 = on
0 = off
1 = on
0 = off
1 = on
0 = off
1 = on
0 = off
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
Note
(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). E0h is used for a
write operation, and E1h is used for a read operation.
DEVICE ADDRESS
1
1
1
0
0
R/W
0
0
1/0
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 500μA 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 500μA = 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.
Table 1 - Gain Setting Values (default = 1000)
G4
G3
G2
G1
Current Step
Size (μA)
0
0
0
0
31.25
0
0
0
1
62.5
0
0
1
0
93.75
0
0
1
1
125
0
1
0
0
156.25
0
1
0
1
187.5
0
1
1
0
218.75
0
1
1
1
250
1
0
0
0
281.25
1
0
0
1
312.5
1
0
1
0
343.75
1
0
1
1
375
1
1
0
0
406.25
1
1
0
1
437.5
1
1
1
0
468.75
1
1
1
1
500
14
SC620
Using the I2C Serial Port
The I2C General Specification
2
The SC620 is a read-write slave-mode I C device and complies with the Philips I 2C 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 device with a read command. The SC620
acknowledges this request and returns the data from the
register location that had previously been set up.
15
SC620
Using the I2C Serial Port (continued)
I2C Direct Format Write
S
Slave Address
W
A
Register Address
A
Data
A
P
Slave Address – 7-bit
Register address – 8-bit
Data – 8-bit
S – Start Condition
W – Write = ‘0’
A – Acknowledge (sent by slave)
P – Stop condition
I2C Stop Separated Format Read
Master Addresses
other Slaves
Register Address Setup Access
S Slave Address W A Register Address A P S
S – Start Condition
W – Write = ‘0’
R – Read = ‘1’
A – Acknowledge (sent by slave)
NAK – Non-Acknowledge (sent by master)
Sr – Repeated Start condition
P – Stop condition
Register Read Access
Slave Address B
S/Sr
Slave Address
R A
Data
NACK P
Slave Address – 7-bit
Register address – 8-bit
Data – 8-bit
I2C Combined Format Read
S
Slave Address
W A
Register Address
S – Start Condition
W – Write = ‘0’
R – Read = ‘1’
A – Acknowledge (sent by slave)
NAK – Non-Acknowledge (sent by master)
Sr – Repeated Start condition
P – Stop condition
A Sr
Slave Address
R
A
Data
NACK P
Slave Address – 7-bit
Register address – 8-bit
Data – 8-bit
16
SC620
Outline Drawing — MLPQ-UT-16 3x3
A
D
DIMENSIONS
B
DIM
PIN 1
INDICATOR
(LASER MARK)
A
A1
A2
b
D
D1
E
E1
e
E
L
N
aaa
A2
A
aaa
SEATING
PLANE
C
bbb
INCHES
MIN
.018
.000
NOM
-
MILLIMETERS
MAX
.024
.002
MIN
0.45
0.00
.012
.122
.071
.122
.071
0.18
2.90
1.55
2.90
1.55
.009
.118
.067
.118
.067
.020 BSC
.012
.016
16
.003
.004
MAX
0.60
0.05
(0.1524)
(.006)
.007
.114
.061
.114
.061
NOM
-
.020
0.23
3.00
1.70
3.00
1.70
0.50 BSC
0.30
0.40
16
0.08
0.10
0.30
3.10
1.80
3.10
1.80
0.50
C
A1
D1
e/2
LxN
E/2
E1
2
1
N
e
bxN
D/2
bbb
C A
B
NOTES:
1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
2. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS.
17
SC620
Land Pattern — MLPQ-UT-16 3x3
H
R
DIMENSIONS
DIM
(C)
Z
K
G
Y
X
P
INCHES
MILLIMETERS
C
(.114)
(2.90)
G
.083
2.10
H
.067
1.70
K
.067
1.70
P
.020
0.50
R
.006
0.15
X
.012
0.30
Y
.031
0.80
Z
.146
3.70
NOTES:
1.
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
18