LT3593ES6#PBF [Linear]
IC LED DISPLAY DRIVER, PDSO6, LEAD FREE, PLASTIC, MO-193, TSOT-23, 6 PIN, Display Driver;
| 型号： | LT3593ES6#PBF |
| 厂家： | 
Linear |
| 描述： | IC LED DISPLAY DRIVER, PDSO6, LEAD FREE, PLASTIC, MO-193, TSOT-23, 6 PIN, Display Driver 驱动 光电二极管 接口集成电路 |
| 文件： | 总16页 (文件大小：175K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT3593
1MHz White LED Driver with
Output Disconnect and One
Pin Current Programming
FEATURES
DESCRIPTION
The LT®3593 is a step-up DC/DC converter designed to
drive up to ten white LEDs in series from a Li-Ion cell.
Series connection of the LEDs provides identical LED
currents and eliminates the need for ballast resistors. The
device features a unique high side LED current sense that
enables the part to function as a “one wire current source”
where the low side of the LED string can be returned to
ground anywhere.
n
Drives Up to Ten White LEDs from a 3V Supply
n
One Pin Shutdown and Current Programming
n
LEDs Disconnected in Shutdown
n
32:1 Linear Brightness Control Range
n
V Range: 2.7V to 5.5V
IN
n
5ꢀ Output Current Accuracy at Full Scale
n
Low Shutdown Current: 3μA
1MHz Switching Frequency
n
n
Requires Only 1μF Output Capacitor
Low Profile 6-Lead DFN (2mm × 2mm × 0.75mm)
Additionalfeaturesincludeoutputdisconnectinshutdown,
open LED protection and 1-pin shutdown/LED current
control. The CTRL pin is toggled to adjust the LED current
via an internal counter and a 5-bit DAC.
n
and 6-Lead SOT-23 Packages
APPLICATIONS
The LT3593 switches at 1MHz, allowing the use of tiny
external components. Constant frequency switching re-
sults in low input noise and a small output capacitor. The
LT3593 is available in the 6-lead DFN (2mm × 2mm) as
well as the 6-lead SOT-23 packages.
n
Cell Phones
n
Digital Cameras
n
PDAs, Handheld Computers
MP3 Players
n
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
n
GPS Receivers
TYPICAL APPLICATION
Li-Ion Driver for Ten White LEDs
Conversion Efficiency
90
10μH
V
= 3.6V
V
IN
IN
10 LEDs
3V TO 5V
1μF
1μF
80
70
60
50
40
30
V
SW
CAP
IN
LT3593
GND
SHUTDOWN AND
CURRENT CONTROL
CTRL
LED
0
5
10
15
20
LED CURRENT (mA)
3593 TA01b
3593 TA01a
3593f
1
LT3593
(Note 1)
ABSOLUTE MAXIMUM RATINGS
Input Voltage...............................................................6V
CTRL Voltage ..............................................................6V
SW Voltage ...............................................................45V
CAP Voltage ..............................................................45V
LED Voltage ..............................................................45V
Operating Junction Temperature Range
(Note 2).................................................... –40°C to 85°C
Maximum Junction Temperature........................... 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
TSOT Package................................................... 300°C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
6
5
4
SW
V
1
2
3
IN
CTRL 1
GND 2
6 LED
5 CAP
4 SW
GND
7
CAP
LED
CTRL
V
IN
3
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
DC PACKAGE
6-LEAD (2mm × 2mm) PLASTIC DFN
T
= 125°C, θ = 192°C/W
JA
JMAX
T
= 125°C, θ = 106°C/W
JA
JMAX
EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT3593EDC#PBF
LT3593ES6#PBF
TAPE AND REEL
PART MARKING
LDBR
PACKAGE DESCRIPTION
TEMPERATURE RANGE
–40°C to 85°C
LT3593EDC#TRPBF
LT3593ES6#TRPBF
6-Lead (2mm × 2mm) Plastic DFN
6-Lead Plastic TSOT-23
LTDBS
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V, VCTRL = 3.6V, unless otherwise specified.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Operating Voltage Range
Supply Current
2.7
5.5
Not Switching; During Current Programming
CTRL = 0
300
3
μA
10
μA
Switching Frequency
Maximum Duty Cycle
Switch Current Limit
0.85
92
1
1.15
MHz
ꢀ
94
700
250
550
mA
mV
Switch V
I
= 250mA
SW
CESAT
3593f
2
LT3593
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V, VCTRL = 3.6V, unless otherwise specified.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
μA
mV
μA
V
Switch Leakage Current
LED Pin Voltage Drop (V
V
SW
= 30V
1
– V
)
LED
I
= 20mA
250
CAP
LED
LED Pin Leakage Current
CTRL High Threshold
CTRL Low Threshold
CTRL = 0, V
= 35V
1
CAP
1.6
0.4
V
CTRL t
CTRL t
CTRL t
Programming Pulse Width (Note 3)
Time from CTRL = 0 to Shutdown
Time from CTRL = 1 to Enable
250
95
ns
PW
SD
EN
128
128
200
200
μs
95
μs
Full-Scale LED Current
V
CAP
V
CAP
= 16V
= 16V
19
18.5
20
20
21
21.5
mA
mA
l
LED Current Programming Resolution
LED Current Limit
Linear Increments
625
45
μA
mA
μA
V
CTRL Pin Bias Current
V
CTRL
= 5.5V
1
l
Overvoltage Protection
36
38
40
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3593E is guaranteed to meet performance specifications
from 0°C to 85°C operating junction temperature range. Specifications
over the –40°C to 85°C operating junction temperature range are assured
by design, characterization and correlation with statistical process
controls.
Note 3: Guaranteed by design.
3593f
3
LT3593
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise specified.
Switch Saturation Voltage
(VCESAT
)
Quiescent Current (VCTRL = 3.6V)
Shutdown Current (VCTRL = 0V)
6
5
4
3
2
1
0
3.50
3.25
3.00
2.75
2.50
2.25
2.00
600
500
400
300
200
100
0
100°C
100°C
100°C
25°C
25°C
25°C
–50°C
–50°C
–50°C
2
3
4
5
6
2
3
4
5
6
0
100
200
300
400
500
600
V
(V)
V
(V)
SWITCH CURRENT (mA)
IN
IN
3593 G02
3593 G03
3593 G01
LED Pin Voltage Drop
(VCAP – VLED
Switching Current Limit vs
Temperature
)
LED Pin Current Limit
300
250
200
150
100
50
46
45
44
43
42
750
700
650
600
550
V
V
= 3.6V
CAP
IN
V
= 3.6V
IN
V
V
= 3.6V
CAP
IN
= 16V
= 16V
100°C
25°C
–50°C
0
0
5
10
LED CURRENT (mA)
15
20
–50
–25
0
25
50
75
100
–50
–25
0
25
50
75
100
TEMPERATURE (°C)
TEMPERATURE (°C)
3593 G04
3593 G05
3593 G06
Transient Response
Switching Waveform
V
CTRL
5V/DIV
I
L
200mA/DIV
I
L
200mA/DIV
V
CAP
200mV/DIV
AC COUPLED
V
CAP
10V/DIV
V
SW
20V/DIV
3393 G08
V
= 3.6V
200μs/DIV
IN
FRONT PAGE
APPLICATION CIRCUIT
3393 G07
V
= 3.6V
1μs/DIV
IN
FRONT PAGE
APPLICATION CIRCUIT
3593f
4
LT3593
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise specified.
Open-Circuit Output Clamp
Voltage vs Temperature
Open-Circuit Output Clamp
Voltage
Input Current in Output Open
Circuit
40
39
38
37
36
10
9
40
39
38
37
36
V
= 3.6V
IN
8
25°C
100°C
–50°C
7
6
5
4
3
2
2
3
4
5
6
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
–50
–25
0
25
50
75
100
V
(V)
V
(V)
TEMPERATURE (°C)
IN
IN
3593 G09
3593 G10
3593 G11
Switching Frequency vs
Temperature
Input Current in Output
Open-Circuit vs Temperatue
LED Current vs CTRL Strobe
Pulses
20
15
10
5
8
7
6
5
4
3
2
1150
1100
1050
1000
950
V
= 3.6V
V
= 3.6V
IN
V
= 3.6V
IN
IN
10LEDS
900
0
850
–25
0
25
TEMPERATURE (°C)
50
75
100
–50
–25
0
25
TEMPERATURE (°C)
50
75
100
0
8
16
NUMBER OF CTRL STROBES
24
32
–50
3593 G14
3593 G12
3593 G13
Full-Scale Current vs
Temperature
Full-Scale Current vs VIN
Full-Scale Current vs VCAP
21.0
20.5
20.0
19.5
19.0
21.0
20.5
20.0
19.5
19.0
21.0
20.5
20.0
19.5
19.0
10 LEDs
V
= 3.6V
IN
10LEDS
5
10
15
20
(V)
25
30
35
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
(V)
–50
–25
0
25
50
75
100
V
V
TEMPERATURE (°C)
CAP
IN
3593 G16
3593 G15
3593 G17
3593f
5
LT3593
PIN FUNCTIONS (DFN/TSOT)
V
(Pin 1/Pin 3): Input Supply Pin. Must be locally by-
The pin must be held high after the final desired positive
strobe edge. The data is transferred after a 128ꢁs (typ)
delay. The part can be reprogrammed to a different value
after it has been enabled, however the current will change
to the new value after 128μs. If CTRL is held low for longer
than 128ꢁs (typ), the part will go into shutdown.
IN
passed with a 1ꢁF X5R or X7R type ceramic capacitor.
GND (Pin 2/Pin 2): Ground Pin. Connect directly to local
ground plane.
SW (Pin 6/Pin 4): Switch Pin. Connect inductor between
this pin and the V pin. Minimize inductance at this pin
IN
LED (Pin 4/Pin 6): LED Pin. An internal switch connects
this pin to CAP. The top of the LED string is connected
to this pin. When the part is in shutdown, the LED pin is
switched off from CAP so no current runs through the
LEDs. The switch is also used to sense the LED current
when the part is on.
to minimize EMI.
CAP (Pin 5/Pin 5): Output Pin. Connect to output capaci-
tor. Minimize trace between this pin and output capacitor
to reduce EMI.
CTRL (Pin 3/Pin 1): Current Control and Shutdown Pin.
This pin is used to program the LED output current. This
pin is strobed up to 32 times to decrement the internal
5-bit DACs from full-scale to 1LSB. The counter will stop
at 1LSB if the strobing continues beyond 32 counts.
Exposed Pad (Pin 7/NA): Ground. The Exposed Pad must
be soldered to the PCB.
BLOCK DIAGRAM
1
6
V
IN
SW
PWM
COMP
–
+
DRIVER
A2
Q1
R
Q
S
CAP
M1
OVERVOLTAGE
PROTECTION
5
+
–
+
–
R
A3
M2
RAMP
GENERATOR
SHDN
V
REF
OSCILLATOR
SHDN
1.24V
–
+
5-BIT
LINEAR DAC
LED
A1
4
R
C
C
C
5-BIT
COUNTER
SHDN
GND
CTRL
7
2
3
3593 F01
PIN NUMBERS REFER TO DFN PACKAGE. REFER TO PIN CONFIGURATION FOR TSOT PIN NUMBERS
Figure 1. Block Diagram
3593f
6
LT3593
OPERATION
The desired current can be calculated by:
= 20mA – (N – 1) • 625μA
The LT3593 uses a constant frequency, current mode
control boost scheme to provide excellent line and load
regulation. Operation can be best understood by referring
to the Block Diagram in Figure 1.
I
LED
where N is the number of rising edges. When the desired
current setting is reached, the CTRL pin must stay high.
128μs after the last rising edge on the CTRL pin, the
regulator will enable the output and start to regulate the
LED current to the programmed value. Figure 2 shows
an example of how the part can be programmed.
Output Disconnect
An internal switch connects between the CAP pin and the
LED pin. The top of the LED string is connected to the
LED pin. The string can be terminated to ground or to
Ifadifferentcurrentisdesired,theCTRLpincanbestrobed
again. The first falling edge will reset the internal register
to the 20mA setting. While the new current is being pro-
grammed,thedevicewillcontinuetoregulatethepreviously
programmed value until the CTRL pin has remained high
for at least 128μs, at which time the regulated current will
slew to the newly programmed value. Figure 3 shows how
to program a new LED current level.
V if a low number of LEDs are driven. When the part is
IN
in shutdown, the switch is off; allowing no current to run
through the LEDs.
Current Programming
The LED current can be set to 32 different values
(625μA – 20mA) by strobing the CTRL pin. A 5-bit
counter is decremented by 1 on a CTRL pin rising edge,
reducing the programmed current by 625μA each time.
If the CTRL pin is held low for longer than 128μs, the part
will go into the shutdown mode.
FULL CURRENT
20mA
CTRL
CTRL
CTRL
CTRL
17.5mA
15mA
12.5mA
3593 F02
Figure 2. Current Programming
128μs
128μs
128μs
CTRL
20mA
20mA
17.5mA
17.5mA
LED
CURRENT
SHDN
3593 F03
Figure 3. Current Programming and Shutdown Timing
3593f
7
LT3593
APPLICATIONS INFORMATION
Inductor Selection
Table 2 shows a list of several ceramic capacitor manufac-
turers. Consultthemanufacturersfordetailedinformation
on their entire selection of ceramic parts.
A 10μH inductor is recommended for most LT3593 ap-
plications. Although small size and high efficiency are
major concerns, the inductor should have low core losses
at 1MHz and low DCR (copper wire resistance). Some
inductors in this category with small size are listed in
Table 1. The efficiency comparison of different inductors
is shown in Figure 4.
Table 2. Recommended Ceramic Capacitor Manufacturers
Taiyo Yuden
(408) 573-4150
www.t-yuden.com
AVX
(803) 448-9411
www.avxcorp.com
Murata
Kemet
(714) 852-2001
www.murata.com
Table 1. Recommended Inductors
CURRENT
(408) 986-0424
www.kemet.com
L
DCR
RATING
(mA)
650
450
PART
LQH43CN100
LQH32CN100
(μH)
(Ω)
VENDOR
Murata
Diode Selection
10
10
0.24
0.44
Schottky diodes, with their low forward voltage drop and
fast reverse recovery, are the ideal choices for LT3593 ap-
plications. The forward voltage drop of a Schottky diode
represents the conduction losses in the diode, while the
diode capacitance (CT or CD) represents the switching
losses. Fordiodeselection, bothforwardvoltagedropand
diode capacitance need to be considered. Schottky diodes
with higher current ratings usually have lower forward
voltage drop and larger diode capacitance, which can
causesignificantswitchinglossesatthe1.0MHzswitching
frequency of the LT3593. A Schottky diode rated at 400mA
to500mAissufficientformostLT3593applications.Some
recommended Schottky diodes are listed in Table 3.
NR3010T100M
10
0.45
500
Taiyo Yuden
VLF4012AT-100M
VLF3010AT-100M
10
10
0.20
0.58
500
490
TDK
DE2812-1098AS-100M
DB3015C-1068AS-100M 10
10
0.29
0.38
580
400
TOKO
90.00
80.00
70.00
60.00
50.00
40.00
30.00
Table 3. Recommended Schottky Diodes
NR3010T100M
VLF4012-AT-100MR50
LQH43CN100K03
VLF3010AT-100MR49
LQH32CN100K53
DB3015C-1068AS-100M
FORWARD VOLTAGE
DIODE
PART
NUMBER
CURRENT DROP CAPACITANCE
(mA)
(V)
(pF)
MANUFACTURER
CMDSH05-4
CMMSH1-40
ZLL5400
500
0.47 at
500mA
50 at 1V
Central
631-435-1110
www.centralsemi.com
0.00
5.00
10.00
15.00
20.00
1000
520
0.55 at
1A
80 at 4V
LED CURRENT (mA)
3593 F04
0.50 at
400mA
15 at 30V Zetex
Figure 4. Efficiency Comparison of Different Inductors
631-543-7100
www.zetex.com
PMEG-
4005AEA
500
0.47 at
500mA
50 at 1V
Phillips
Capacitor Selection
+3140 27 24825
www.semiconductors.
phillips.com
The small size of ceramic capacitors makes them ideal
for LT3593 applications. Use only X5R and X7R types
because they retain their capacitance over wider voltage
and temperature ranges than other types such as Y5V or
Z5U. A 1μF input capacitor and a 1μF output capacitor are
sufficient for most applications.
3593f
8
LT3593
APPLICATIONS INFORMATION
Overvoltage Protection
Low Input Voltage Applications
The LT3593 has an internal open-circuit protection circuit.
In the case of an output open circuit, when the LEDs are
The LT3593 can be used in low input voltage applications.
The input supply voltage to the LT3593 must be 2.7V or
higher, but the inductor can be run off a lower battery
voltage. This technique allows the LEDs to be powered off
two alkaline cells. Most portable devices have a 3.3V logic
supply voltage which can be used to power the LT3593.
TheLEDscanbedrivenstraightfromthebattery, resulting
in higher efficiency.
disconnected from the circuit or the LEDs fail open, V
CAP
is clamped at 38V. The LT3593 will then switch at a very
low frequency to minimize input current. V
and input
CAP
currentduringoutputopencircuitareshownintheTypical
PerformanceCharacteristics.Figure5showsthetransient
response when the LEDs are disconnected.
Figure 6 shows three LEDs powered by two AA cells.
The battery is connected to the inductors and the chip is
powered off a 3.3V logic supply voltage.
L1
10μH
D1
2 AA CELLS
2V TO 3.2V
C1
1μF
C2
1μF
SW
V
3.3V
CAP
LED
IN
C3
1μF
LT3593
I
L
200mA/DIV
SHUTDOWN AND
CURRENT CONTROL
CTRL
GND
V
CAP
20V/DIV
V
SW
3593 F06
20V/DIV
C1: TAIYO YUDEN EMK107B5105MA
C2: MURATA GRM31MR71H105KA88
L1: MURATA LQH43CN100
3593 F05
V
= 3.6V
400μs/DIV
IN
FRONT PAGE
LEDs DISCONNECTED
AT THIS INSTANT
D1: CENTRAL CMDSH05-4
APPLICATION CIRCUIT
Figure 5. Output Open-Circuit Waveform
Figure 6. Two AA Cells to Three White LEDs
3593f
9
LT3593
APPLICATIONS INFORMATION
Board Layout Considerations
Switchingnodepin(SW).Keepthesensevoltagepins(CAP
and LED) away from the switching node. Place C2 next to
theCAPpin.Alwaysuseagroundplaneundertheswitching
regulator to minimize interplane coupling. Recommended
component placement is shown in Figure 7.
As with all switching regulators, careful attention must
be paid to the PCB layout and component placement. To
prevent electromagnetic interference (EMI) problems,
properlayoutofhighfrequencyswitchingpathsisessential.
Minimize the length and area of all traces connected to the
L1
L1
V
V
IN
IN
C1
D1
D1
C1
4
3
6
5
4
1
2
3
7
5
6
2
1
CTRL
GND
CTRL
GND
C2
C2
3593 F07
DFN Package
TSOT-23 Package
Figure 7. Recommended Component Placement
3593f
10
LT3593
TYPICAL APPLICATIONS
Li-Ion Driver for One White LED
Conversion Efficiency
70
60
50
40
30
20
10
V
= 3.6V
IN
1 LED
C2
1μF
L1
D1
10μH
V
IN
3V TO 5V
C1
1μF
V
SW
IN
CAP
LT3593
GND
SHUTDOWN AND
CURRENT CONTROL
LED
CTRL
0
5
10
15
20
3593 TA02a
LED CURRENT (mA)
3593 TA02b
C1: TAIYO YUDEN EMK107BJ105MA
C2: TAIYO YUDEN GMK316BJ105ML
L1: MURATA LQH43CN100
D1: CENTRAL CMDSH05-4
Li-Ion Driver for Two White LED
Conversion Efficiency
80
70
60
50
40
30
20
V
= 3.6V
IN
2 LEDs
C2
1μF
L1
D1
10μH
V
IN
3V TO 5V
C1
1μF
V
SW
IN
CAP
LT3593
GND
SHUTDOWN AND
CURRENT CONTROL
LED
CTRL
0
5
10
15
20
3593 TA03a
LED CURRENT (mA)
3593 TA03b
C1: TAIYO YUDEN EMK107BJ105MA
C2: TAIYO YUDEN GMK316BJ105ML
L1: MURATA LQH43CN100
D1: CENTRAL CMDSH05-4
3593f
11
LT3593
TYPICAL APPLICATIONS
Li-Ion Driver for Three White LEDs
Efficiency
90
80
70
60
50
40
30
L1
V
= 3.6V
10μH
D1
IN
V
IN
3V TO 5V
3 LEDs
C1
1μF
C2
1μF
V
SW
CAP
IN
LT3593
GND
SHUTDOWN AND
CURRENT CONTROL
CTRL
LED
3593 TA04a
C1: TAIYO YUDEN EMK107BJ105MA
C2: TAIYO YUDEN GMK316BJ105ML
L1: MURATA LQH43CN100
0
5
10
15
20
LED CURRENT (mA)
D1: CENTRAL CMDSH05-4
3593 TA04b
Li-Ion Driver for Four White LEDs
Efficiency
L1
90
80
70
60
50
40
30
D1
10μH
V
= 3.6V
IN
V
IN
3V TO 5V
4 LEDs
C1
1μF
C2
1μF
V
SW
CAP
IN
LT3593
GND
SHUTDOWN AND
CURRENT CONTROL
CTRL
LED
3593 TA05a
0
5
10
15
20
C1: TAIYO YUDEN EMK107BJ105MA
C2: TAIYO YUDEN GMK316BJ105ML
L1: MURATA LQH43CN100
LED CURRENT (mA)
3593 TA05b
D1: CENTRAL CMDSH05-4
Li-Ion Driver for Six White LEDs
Efficiency
90
80
70
60
50
40
30
L1
V
= 3.6V
IN
D1
10μH
V
IN
3V TO 5V
6 LEDs
C1
1μF
C2
1μF
V
SW
CAP
IN
LT3593
GND
SHUTDOWN AND
CURRENT CONTROL
CTRL
LED
0
5
10
15
20
LED CURRENT (mA)
3593 TA06b
3593 TA06a
C1: TAIYO YUDEN EMK107BJ105MA
C2: TAIYO YUDEN GMK316BJ105ML
L1: MURATA LQH43CN100
D1: CENTRAL CMDSH05-4
3593f
12
LT3593
TYPICAL APPLICATIONS
Li-Ion Driver For Ten White LEDs
Efficiency
90
80
70
60
50
40
30
L1
V
= 3.6V
IN
10μH
D1
10 LEDs
V
IN
3V TO 5V
C1
1μF
C2
1μF
V
SW
CAP
IN
LT3593
GND
SHUTDOWN AND
CURRENT CONTROL
CTRL
LED
0
5
10
15
20
LED CURRENT (mA)
3593 TA07b
3593 TA07a
C1: TAIYO YUDEN EMK107BJ105MA
C2: MURATA GRM31MR71H105KA88
L1: MURATA LQH43CN100
D1: CENTRAL CMDSH05-4
Li-Ion Driver For Ten White LEDs
Efficiency
90
80
70
60
50
40
30
L1
V
= 3.6V
IN
22μH
D1
10 LEDs
V
IN
3V TO 5V
C1
1μF
C2
2.2μF
V
SW
CAP
IN
LT3593
GND
SHUTDOWN AND
CURRENT CONTROL
CTRL
LED
0
5
10
15
20
LED CURRENT (mA)
3593 TA08b
3593 TA08a
C1: TAIYO YUDEN EMK107BJ105MA
C2: MURATA GRM31CR71H225KA88
L1: MURATA LQH43CN220
D1: CENTRAL CMDSH05-4
3593f
13
LT3593
PACKAGE DESCRIPTION
DC Package
6-Lead Plastic DFN (2mm × 2mm)
(Reference LTC DWG # 05-08-1703)
0.675 ±0.05
2.50 ±0.05
0.61 ±0.05
1.15 ±0.05
(2 SIDES)
PACKAGE
OUTLINE
0.25 ± 0.05
0.50 BSC
1.42 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
R = 0.115
TYP
0.56 ± 0.05
(2 SIDES)
0.38 ± 0.05
4
6
2.00 ±0.10
(4 SIDES)
PIN 1 BAR
TOP MARK
(SEE NOTE 6)
PIN 1
CHAMFER OF
EXPOSED PAD
(DC6) DFN 1103
3
1
0.25 ± 0.05
0.50 BSC
0.75 ±0.05
0.200 REF
1.37 ±0.05
(2 SIDES)
BOTTOM VIEW—EXPOSED PAD
0.00 – 0.05
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WCCD-2)
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
3593f
14
LT3593
PACKAGE DESCRIPTION
S6 Package
6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
2.90 BSC
(NOTE 4)
0.62
MAX
0.95
REF
1.22 REF
1.4 MIN
1.50 – 1.75
2.80 BSC
3.85 MAX 2.62 REF
(NOTE 4)
PIN ONE ID
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.30 – 0.45
6 PLCS (NOTE 3)
0.95 BSC
0.80 – 0.90
0.20 BSC
DATUM ‘A’
0.01 – 0.10
1.00 MAX
0.30 – 0.50 REF
1.90 BSC
0.09 – 0.20
(NOTE 3)
S6 TSOT-23 0302 REV B
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
3593f
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
15
LT3593
TYPICAL APPLICATION
Li-Ion Driver for Six LEDs
Efficiency
90
80
70
60
50
40
30
L1
V
= 3.6V
IN
D1
10μH
V
6 LEDs
IN
3V TO 5V
C1
1μF
C2
1μF
V
SW
CAP
IN
LT3593
GND
SHUTDOWN AND
CURRENT CONTROL
CTRL
LED
0
5
10
15
20
LED CURRENT (mA)
3593 TA06b
3593 TA06a
C1: TAIYO YUDEN EMK107BJ105MA
C2: TAIYO YUDEN GMK316BJ105ML
L1: MURATA LQH43CN100
D1: CENTRAL CMDSH05-4
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
I
< 1μA, ThinSOTTM Package
SD
LT1932
Constant Current, 1.2MHz, High Efficiency White LED Up to 8 White LEDs, V : 1V to 10V, V
Boost Regulator
= 34V, I = 1.2mA,
Q
IN
OUT(MAX)
LT1937
Constant Current, 1.2MHz, High Efficiency White LED Up to 4 White LEDs, V : 2.5V to 10V, V
= 34V, I = 1.9mA,
OUT(MAX) Q
IN
Boost Regulator
I
< 1μA, ThinSOT and SC70 Packages
SD
LTC®3200
LTC3200-5
LTC3201
Low Noise, 2MHz Regulated Charge Pump White
LED Driver
Low Noise, 2MHz Regulated Charge Pump White
LED Driver
Low Noise, 1.7MHz Regulated Charge Pump White
LED Driver
Up to 6 White LEDs, V : 2.7V to 4.5V, I = 8mA, I < 1μA, MS Package
IN Q SD
Up to 6 White LEDs, V : 2.7V to 4.5V, I = 8mA, I < 1μA, ThinSOT
IN Q SD
Package
Up to 6 White LEDs, V : 2.7V to 4.5V, I = 6.5mA, I < 1μA, MS Package
IN
Q
SD
LTC3202
Low Noise, 1.5MHz Regulated Charge Pump White
LED Driver
Up to 8 White LEDs, V : 2.7V to 4.5V, I = 5mA, I < 1μA, MS Package
IN Q SD
LTC3205
High Efficiency, Multidisplay LED Controller
Up to 4 (Main), 2 (Sub) and RGB, V : 2.8V to 4.5V, I = 50μA, I < 1μA,
IN Q SD
24-Lead QFN Package
Up to 4 White LEDs and One High current CAM LED, V : 2.9V to 4.5V,
LTC3210
Low Noise Charge Pump LED Controller
IN
I = 4.5mA, I < 6μA, UD Package
Q
SD
LT3465/LT3465A
Constant Current, 1.2MHz/2.7MHz, High Efficiency
White LED Boost Regulator with Integrated Schottky
Diode
Up to 6 White LEDs, V : 2.7V to 16V, V
SD
= 34V, I = 1.9mA,
OUT(MAX) Q
IN
I
< 1μA, ThinSOT Package
LT3466/LT3466-1
LT3486
Dual Full Function, 2MHz Diodes White LED Step-Up Up to 20 White LEDs, V : 2.7V to 24V, V
= 39V,
IN
OUT(MAX)
Converter with Built-In Schottkys
DFN and TSSOP-16 Packages
Dual 1.3A White LED Converter with 1000:1 True
Color PWM Dimming
Drives Up to 16 100mA White LEDs. V : 2.5V to 24V, V
= 36V,
IN
OUT(MAX)
DFN and TSSOP Packages
LT3491
White LED Driver with Integrated Schottky
Up to 6 White LEDs, V : 2.5V to 12V, I = 2.6mA, I < 10μA, SC70 and
IN
Q
SD
2mm × 2mm DFN Packages
LT3591
White LED Driver with Integrated Schottky
Up to 10 White LEDs, V : 2.5V to 12V, I = 4mA, I < 11μA,
IN
Q
SD
3mm × 2mm DFN Package
ThinSOT is a trademark of Linear Technology Corporation.
3593f
LT 0308 • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
16
●
●
© LINEAR TECHNOLOGY CORPORATION 2008
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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