ONSEMI CAT4137TD-T3

CAT4137
CMOS Boost Converter – White LED Driver
FEATURES
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DESCRIPTION
Drives up to 5 White LEDs from 3V
Power Efficiency up to 87%
Low Quiescent Ground Current 0.1mA
Adjustable Output Current (up to 30mA)
High Frequency 1MHz Operation
“Zero” current shutdown mode
Operates down to 2V (from two AA batteries)
Soft start power-up
Open LED low power mode
Automatic shutdown at 1.9V (UVLO)
Thermal shutdown protection
Thin SOT23 5-Lead (1mm max height)
The CAT4137 is a DC/DC step-up converter that
delivers a regulated output current. Operation at a
constant switching frequency of 1MHz allows the
device to be used with small value external ceramic
capacitors and inductor.
The device drives a string of white LEDs connected
in series and provides the regulated current to control
the LEDs with inherent uniform brightness and
matching. An external resistor R1 sets the output
current and allows up to 30mA current to be
supported over a wide range of input supply voltages
from 2.2V to 5.5V, making the device ideal for
battery-powered applications.
LED dimming can be done by using a DC voltage, a
logic signal, or a pulse width modulation (PWM)
signal. The shutdown control pin allows the device to
be placed in power-down mode with “zero” quiescent
current.
APPLICATIONS
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LCD Backlighting
Cellular Phones
Handheld Devices
Digital Cameras
In addition to thermal protection and overload current
limiting, the device also enters a very low power
operating mode during “Open LED” fault conditions.
The device is housed in a low profile (1mm max
height) 5-lead thin SOT23 package for space critical
applications.
ORDERING INFORMATION
Part Number
CAT4137TD-T3
Package
TSOT23-5(1)
Quantity
per Reel
3000
Package
Marking
LX
CAT4137TD-GT3
TSOT23-5(2)
3000
UE
For Ordering Information details see page 15.
Notes: (1) Matte-Tin Plated Finish (RoHS-compliant).
(2) NiPdAu Plated Finish (RoHS-compliant).
PIN CONFIGURATION
TYPICAL APPLICATION CIRCUIT
TSOT-23 5-Lead
1mm max height
SW
1
GND
2
FB
3
5
L
VIN
2.2 to
5.5V
C1
VIN
D
VOUT
22µH
C2
SW
1µF
VIN
0.22µF
CAT4137
4
SHDN
OFF ON
SHDN
GND
(Top View)
FB
VFB = 300mV
R1
15Ω
L: Murata LQH32CN220
D: Central CMDSH2-3 (rated 30V)
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
1
Doc. No. MD-5012 Rev. C
CAT4137
ABSOLUTE MAXIMUM RATINGS
Parameter
Rating
Unit
VIN, FB voltage
-0.3 to +7
V
¯¯¯¯¯ voltage
SHDN
-0.3 to +7
V
SW voltage
-0.3 to 40
V
Storage Temperature Range
-65 to +160
°C
Junction Temperature Range
-40 to +150
°C
300
°C
Lead Temperature
RECOMMENDED OPERATING CONDITIONS
Parameter
VIN
SW pin voltage
Ambient Temperature Range
LED Bias Current
Range
Unit
2.2 to 5.5
V
0 to 24
V
-40 to +85
°C
1 to 30
mA
ELECTRICAL OPERATING CHARACTERISTICS
VIN = 3.6V, ambient temperature of 25ºC (over recommended operating conditions unless specified otherwise)
Symbol Parameter
IQ
Operating Current
ISD
Shutdown Current
Conditions
VFB = 0.3V
VFB = 0.4V (not switching)
VSHDN
¯¯¯¯¯ = 0V
VFB
FB Pin Voltage
3 LEDs with ILED=20mA
IFB
FB pin input leakage
R1 = 10Ω
R1 = 15Ω
R1 = 20Ω
Enable Threshold Level
Shutdown Threshold Level
Min
Typ
0.4
0.1
0.1
Max
1.5
0.3
1
Unit
285
300
315
mV
1
31.5
21
15.75
1.5
µA
0.4
0.1
30
20
15
0.8
0.7
28.5
19
14.25
mA
µA
ILED
Programmed LED Current
VIH
VIL
¯¯¯¯¯ Logic High
SHDN
¯¯¯¯¯ Logic Low
SHDN
FSW
Switching Frequency
0.7
1
1.3
MHz
ILIM
Switch Current Limit
250
300
400
mA
RSW
Switch “On” Resistance
ISW = 100mA
1.0
2.0
Ω
ILEAK
Switch Leakage Current
Switch Off, VSW = 5V
1
5
µA
TSD
Thermal Shutdown
150
ºC
THYS
Thermal Hysteresis
20
ºC
86
%
1.9
V
29
V
η
VUVLO
VOV-SW
Efficiency
Under-voltage lock out
(UVLO) threshold
Output Clamp Voltage
Doc. No. MD-5012 Rev. C
Typical Application Circuit
“Open LED” fault
2
mA
V
V
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT4137
TYPICAL CHARACTERISTICS
VIN = 3.6V, CIN = 1.0uF, COUT = 0.22µF, L = 22µH with 3 LEDs at 20mA, TAMB=25ºC, unless otherwise specified.
Quiescent Current vs. VIN (Switching)
Quiescent Current vs. VIN (Not Switching)
120
1.00
SUPPLY CURRENT [mA]
SUPPLY CURRENT [uA]
VFB = 0.4V
100
80
60
40
20
0
0.50
0.25
0.00
2.5
3.0
3.5
4.0
4.5
INPUT VOLTAGE [V]
5.0
2.5
3.5
4.0
4.5
5.0
FB Pin Voltage vs. Output Current
310
310
FB PIN VOLTAGE [mV]
3 LEDs
305
300
295
290
2.5
3.0
3.5
4.0
4.5
3 LEDs
305
300
295
290
5.0
0
INPUT VOLTAGE [V]
5
10
15
20
25
30
OUTPUT CURRENT [mA]
Switching Frequency vs. Supply Voltage
Switch ON Resistance vs. Input Voltage
2.0
SWITCH RESISTANCE [ohm]
1.10
CLOCK FREQUENCY [MHz].
3.0
INPUT VOLTAGE [V]
FB Pin Voltage vs. Supply Voltage
FB PIN VOLTAGE [mV]
0.75
1.05
3 LEDs at 20mA
1.00
0.95
1.5
1.0
0.5
0.0
0.90
2.5
3.0
3.5
4.0
2.5
4.5
INPUT VOLTAGE [V]
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
3
3.0
3.5
4.0
4.5
INPUT VOLTAGE [V]
5.0
Doc. No. MD-5012 Rev. C
CAT4137
TYPICAL CHARACTERISTICS
VIN = 3.6V, CIN = 1.0uF, COUT = 0.22µF, L = 22µH, with 3 LEDs at 20mA, TAMB=25ºC, unless otherwise specified.
LED Current Regulation
LED Current vs. Input Voltage (3 LEDs)
35
0.4
LED CURRENT VARIATION [%]
Rfb = 10Ω
LED CURRENT [mA]
30
25
Rfb = 15Ω
20
15
Rfb = 20Ω
10
5
0
2.0
2.5
3.0
3.5 4.0 4.5
INPUT VOLTAGE [V]
5.0
0.2
0.0
-0.2
-0.4
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE [V]
Efficiency across Supply Voltage (3 LEDs)
Efficiency across Load Current (3 LEDs)
100
100
VIN = 4.2V
EFFICIENCY [%]
EFFICIENCY [%]
15mA
90
80
20mA
70
60
90
80
VIN = 3.6V
70
60
2.0
2.5
3.0
3.5
4.0
4.5
5.0
0
5
INPUT VOLTAGE [V]
10
20
25
30
LED CURRENT [mA]
Efficiency across Supply Voltage (4 LEDs)
Efficiency across Load Current (4 LEDs)
100
100
VIN = 4.2V
15mA
90
EFFICIENCY [%]
EFFICIENCY [%]
15
80
20mA
70
90
VIN = 3.6V
80
70
60
60
2.0
2.5
3.0
3.5
4.0
4.5
0
5.0
10
15
20
25
30
LED CURRENT [mA]
INPUT VOLTAGE [V]
Doc. No. MD-5012 Rev. C
5
4
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT4137
TYPICAL CHARACTERISTICS
VIN = 3.6V, CIN = 1.0uF, COUT = 0.22µF, L = 22µH, with 3 LEDs at 20mA, TAMB=25ºC, unless otherwise specified.
Shutdown Voltage vs. Input Voltage
FB Pin Voltage vs. Temperature
1.0
SHUTDOWN VOLTAGE [V]
FB PIN VOLTAGE [mV]
304
302
300
298
3 LEDs at 20mA
296
294
25°C
0.8
0.6
85°C
0.4
0.2
-50
-25
0
25
50
75
100
3.0
3.5
4.0
4.5
INPUT VOLTAGE [V]
TEMPERATURE [°C]
5.0
Switching Frequency vs. Temperature
Under Voltage Lock Out vs. Temperature
1.10
CLOCK FREQUENCY[MHz].
2.2
2.1
UVLO [V]
-40°C
2.0
1.9
1.8
1.7
20mA per LED
1.05
1.00
0.95
0.90
1.6
-50
-25
0
25
50
75
-50
100
TEMPERATURE [°C]
100
Switching Waveforms (2 LEDs in Series)
Switching Waveforms (3 LEDs in Series)
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
-25
0
25 50 75
TEMPERATURE [ºC]
5
Doc. No. MD-5012 Rev. C
CAT4137
TYPICAL CHARACTERISTICS
VIN = 3.6V, CIN = 1.0uF, COUT = 0.22µF, L = 22µH, with 3 LEDs at 20mA, TAMB=25ºC, unless otherwise specified.
Line Transient Response (3V – 5.5V)
Power-up with 3 LEDs at 20mA
Maximum Output Current vs. Input Voltage
MAX OUTPUT CURRENT [mA]
140
120
VOUT = 10V
100
80
60
40
VOUT = 17V
20
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE [V]
Doc. No. MD-5012 Rev. C
6
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT4137
PIN DESCRIPTION
VIN is the supply input for the internal logic. The
device is compatible with supply voltages down to
2.2V and up to 5.5V. A small bypass ceramic
capacitor of 1µF is recommended between the VIN
and GND pins near the device. The under-voltage
lockout (UVLO) circuitry will place the device into an
idle mode (not switching) whenever the supply falls
below 1.9V.
SW pin is the drain terminal of the internal low
resistance power switch. The inductor and the
Schottky diode anode should be connected to the
SW pin. Traces going to the SW pin should be as
short as possible with minimum loop area. This pin
contains over-voltage circuitry which becomes active
above 24V. In the event of an “Open-Led” fault
condition, the device will enter a low power mode
and the SW pin will be clamped to approximately
30V.
¯¯¯¯¯ is the shutdown logic input. When the pin
SHDN
voltage is taken below 0.4V, the device immediately
enters shutdown mode, drawing nearly zero current.
At voltages greater than 1.5V, the device becomes
fully enabled and operational.
FB feedback pin is regulated at 0.3V. A resistor
connected between the FB pin and ground sets the
LED current according to the formula:
ILED = 0.3V/R1
GND is the ground reference pin. This pin should be
connected directly to the ground plane on the PCB.
The lower LED cathode is connected to the FB pin.
Pin #
Name
1
SW
2
GND
Ground pin. Connect the pin to the ground plane.
3
FB
Feedback pin. Connect to the last LED cathode.
4
¯¯¯¯¯
SHDN
5
VIN
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
Function
Switch pin. This is the drain of the internal power switch.
Shutdown pin (Logic Low). Set high to enable the driver.
Power Supply input.
7
Doc. No. MD-5012 Rev. C
CAT4137
DEVICE OPERATION
The CAT4137 is a fixed frequency (1MHz), low
noise, inductive boost converter providing constant
current to the load. A high voltage internal CMOS
power switch is used to energize the external
inductor. When the power switch is then turned off,
the stored energy inductor is released into the load
via the external Schottky diode.
In the event of a “Open-Led” fault condition, where
the feedback control loop becomes open, the output
voltage will continue to increase. Once this voltage
exceeds 24V, an internal protection circuit will
become active and place the device into a very low
power safe operating mode. In addition, an internal
clamping circuit will limit the peak output voltage to
29V. If this fault condition is repaired, the device will
automatically resume normal operation.
The on/off duty cycle of the power switch is internally
adjusted and controlled to maintain a constant
regulated voltage of 0.3V across the external
feedback resistor connected to the feedback pin
(FB). The value of external resistor will accurately set
the LED bias current accordingly (0.3V/R1).
Thermal overload protection circuitry has been
included to prevent the device from operating at
unsafe junction temperatures above 150ºC. In the
event of a thermal overload condition the device will
automatically shutdown and wait till the junction
temperatures cools to 130ºC before normal operation
is resumed.
During the initial power-up stage, the duty cycle of
the internal power switch is limited to prevent
excessive in-rush currents and thereby provide a
“soft-start” mode of operation.
While in normal operation, the device will comfortably
deliver up to 30mA of bias current into a string of up to
5 white LEDs.
BLOCK DIAGRAM
VOUT
VIN
SW
C1
C2
1MHz
Oscillator
300mV
+
Enable
SHDN
–
Thermal
Shutdown
& UVLO
A1
PWM
&
Logic
+
RC
A2
–
Driver
ILED
N1
CC
RS
GND
–
VREF
+
VIN
Over Voltage
Protection
Current
Sense
FB
R1
15Ω
Doc. No. MD-5012 Rev. C
8
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT4137
APPLICATION INFORMATION
EXTERNAL COMPONENT SELECTION
Schottky Diode
The current rating of the Schottky diode must
exceed the peak current flowing through it. The
Schottky diode performance is rated in terms of its
forward voltage at a given current. In order to
achieve the best efficiency, this forward voltage
should be as low as possible. The response time is
also critical since the driver is operating at 1MHz.
Central Semiconductor Schottky CMDSH2-3
(200mA rated) or the CMDSH-3 (100mA rated) is
recommended for most applications.
Capacitors
The CAT4137 only requires small ceramic
capacitors of 1uF on the input and 0.22µF on the
output. The output capacitor should be rated at 30V
or greater. Under normal conditions, a 1µF input
capacitor is sufficient. For applications with higher
output power, a larger input capacitor of 2.2µF or
4.7µF may be appropriate. X5R and X7R capacitor
types are ideal due to their stability across
temperature range.
Inductor
A 22µH inductor is recommended for most of the
CAT4137 applications. In cases where the
efficiency is critical, inductances with lower series
resistance are preferred. Several inductor types
from various vendors can be used. Figure 1 shows
how different inductor types affect the efficiency
across the load range.
EFFICIENCY (%)
100
LED Current Setting
The LED current is set by the external resistor
between the feedback pin (FB) and ground. The
formula below gives the relationship between the
resistor and the current:
R1 = 0.3V/LED current
3 LEDs
VIN = 3.6V
90
80
SUMIDA CDRH3D16-220
MURATA LQH32CN220
PANASONIC ELJ-EA220
PANASONIC ELJ-PC220
70
LED current (mA)
R1 (Ω)
5
60
10
30
15
20
20
15
25
12
30
10
Table 1. Resistor R1 and LED current
60
5
10
15
20
25
LED CURRENT [mA]
30
Figure 1. Efficiency for various inductors
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
9
Doc. No. MD-5012 Rev. C
CAT4137
TYPICAL APPLICATIONS
Efficiency vs. LED Current, Two LEDs
CAT4137 Driving Two LEDs
L
VIN
1µF
100
VOUT
95
33µH
C2
SW
1µF
VIN
CAT4137
OFF ON
SHDN
FB
20mA
VFB = 300mV
GND
EFFICIENCY [%]
2.2V to
5.0V
C1
D
VIN = 3.6V
90
85
80
R1
75
15Ω
70
VIN = 3V
0
10
20
30
40
LED CURRENT [mA]
L: Sumida CDRH3D16-330
D: Central CMDSH2-3 (rated 30V)
C2: Taiyo Yuden GMK212BJ105KG-T (rated 35V)
For best performance, a 33µH inductor and a 1µF
output capacitor are recommended for 2-LED
applications.
In 2-LED configuration, the CAT4137 can be powered
from two AA alkaline cells or from a Li-ion battery.
Doc. No. MD-5012 Rev. C
10
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT4137
DIMMING CONTROL
There are several methods available to control the
LED brightness.
2. Filtered PWM signal
A filtered PWM signal can be used as a variable DC
voltage that can be used to control the LED current.
Figure 4 shows the PWM control circuitry connected
to the CAT4137 FB pin. The PWM signal has a
voltage swing of 0V to 2.5V. The LED current can be
dimmed within a range from 0 to 22mA. The PWM
signal frequency can vary from very low frequency up
to 100kHz.
¯¯¯¯¯ pin
1. PWM signal on the SHDN
LED brightness dimming can be done by applying a
¯¯¯¯¯ input. The LED current is
PWM signal to the SHDN
repetitively turned on and off, so that the average
current is proportional to the duty cycle. A 100% duty
¯¯¯¯¯ always high, corresponds to the
cycle, with SHDN
LEDs at nominal current. Figures 2 and 3 show 1kHz
and 4kHz signals with a 50% duty cycle applied to the
¯¯¯¯¯ pin. The PWM frequency range is from 100Hz
SHDN
to 10kHz. The recommended PWM frequency range
is from 100Hz to 4kHz.
VIN
SW
CAT4137
SHDN
GND
¯¯¯¯¯
Switching waveforms PWM on SHDN
RA
4.02kΩ
PWM 2.5V
Signal 0V
VIN
C1
0.22µF
LED
Current
FB
VFB = 300mV
RB
3.3kΩ
R2
1kΩ
R1
15Ω
Figure 4. Circuit for filtered PWM signal
A PWM signal at 0V DC, or a 0% duty cycle, results in
a max LED current of about 22mA. A PWM signal with
a 100% duty cycle results in an LED current of 0mA.
LED Current vs. Duty Cycle
Figure 2. PWM at 1kHz
25
LED CURRENT [mA]
20
15
10
5
0
0
20
40
60
80
DUTY CYCLE [%]
100
Figure 3. PWM at 4kHz
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
11
Doc. No. MD-5012 Rev. C
CAT4137
OPEN LED PROTECTION
In the event of an “Open LED” fault condition, the
CAT4137 will continue to boost the output voltage
with maximum power until the output voltage reaches
approximately 24V. Once the output exceeds this
level, internal circuitry immediately places the device
into a very low power mode where the total input
power consumed is less than 10mW.
In low power mode, the input supply current will
typically drop to 2mA. An internal clamping circuit will
limit the subsequent output voltage to approximately
29V. This operating mode eliminates the need for any
external protection zener diode. This protection
scheme also fully protects the device against any
malfunction in the external Schottky diode (opencircuit).
Open LED Power-up Waveforms
Open LED Protection
(Central CMDSH2-3)
L
VIN
D
VOUT
22µH
C1
C2
1µF
0.22µF
SW
VIN
CAT4137
OFF ON
SHDN
FB
VFB = 300mV
GND
R1
15Ω
Open LED Supply Current vs. VIN
SUPPLY CURRENT [mA]
2.5
2.0
1.5
1.0
2.5
Doc. No. MD-5012 Rev. C
3.0
3.5
4.0
4.5
INPUT VOLTAGE [V]
5.0
12
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT4137
BOARD LAYOUT
The CAT4137 is a high-frequency switching regulator.
Traces carrying high-frequency switching current have
to be carefully layout on the board in order to minimize
EMI, ripple and noise in general. The thicker lines
shown on Figure 4 indicate the switching current path.
All these traces have to be short and wide enough to
minimize the parasitic inductance and resistance. The
loop shown on Figure 4 corresponds to the current
path when the CAT4137 internal switch is closed. On
Figure 5 is shown the current loop when the CAT4137
switch is open. Both loop areas should be as small as
possible.
L
D
Capacitor C1 has to be placed as close as possible to
the VIN pin and GND. The capacitor C2 has to be
connected separately to the top LED anode. A
ground plane under the CAT4137 allows for direct
connection of the capacitors to ground. The resistor
R1 must be connected directly to the GND pin of the
CAT4137 and not shared with the switching current
loops and any other components.
L
VOUT
D
VOUT
VIN
VIN
SW
SW
VIN
VIN
CAT4137
Switch
Closed
SHDN
C1
CAT4137
FB
SHDN
C2
R1
FB
C2
C1
R1
GND
GND
Figure 5. Open-switch current loop
Figure 4. Closed-switch current loop
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
Switch
Open
13
Doc. No. MD-5012 Rev. C
CAT4137
PACKAGE OUTLINE DRAWING
TSOT-23 5-Lead (TD) (1)(2)
SYMBOL
D
MIN
NOM
0.01
0.05
0.10
A2
0.80
0.87
0.90
b
0.30
c
0.12
0.15
0.20
A
e
1.00
A1
E1
E
MAX
0.45
D
2.90 BSC
E
2.80 BSC
E1
1.60 BSC
e
0.95 TYP
L
0.30
0.40
L1
0.60 REF
L2
0.25 BSC
θ
0º
0.50
8º
TOP VIEW
A2 A
b
θ
L
A1
c
L1
SIDE VIEW
L2
END VIEW
For current Tape and Reel information, download the PDF file from:
http://www.catsemi.com/documents/tapeandreel.pdf.
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC standard MO-193.
Doc. No. MD-5012 Rev. C
14
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT4137
EXAMPLE OF ORDERING INFORMATION1
Prefix
CAT
Device #
Suffix
4137
TD
–
Product Number
4137
Optional
Company ID
G
T3
Lead Finish
G: NiPdAu
Blank: Matte-Tin(4)
Tape & Reel
T: Tape & Reel
3: 3000/Reel
Package
TD: TSOT-23
Notes:
(1) All packages are RoHS-compliant (Lead-free, Halogen-free).
(2) The standard lead finish is NiPdAu.
(3) The device used in the above example is a CAT4137TD–GT3 (TSOT-23, NiPdAu Plated Finish, Tape & Reel 3000).
(4) For Matte-Tin package option, please contact your nearest ON Semiconductor Sales office.
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
15
Doc. No. MD-5012 Rev. C
CAT4137
REVISION HISTORY
Date
Rev.
Reason
13-Dec-05
00
Initial Issue
11-Jan-08
B
Add NiPdAu lead finish
Add Extended Temperature range
Update Package Outline Drawing
Add Example of Ordering Information
Change Document Number from 25093, Rev. 00 to MD-5016, Rev. B
17-Nov-08
C
Change logo and fine print to ON Semiconductor
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to
any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
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