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SEMICONDUCTOR
TECHNICAL DATA
White LED Step-Up Converter
The KAB3403T/DN is a monolithic step-up DC/DC converter specifically designed to drive white LEDs with a constant current from Li-ion cell. Relative large 320mV feedback voltage & it s high accuracy help you setting LED current with a external resistor. KAB3403T/DN is available in a extremely low profile & small TS-6 package. A 10 H inductor is sufficient for most application. FEATURES
Inherently Matched LED Current. High Efficiency : 87% (max.)
C
KAB3403T/DN
BICD LINEAR INTEGRATED CIRCUIT
E K B K
1 G
6
2
5
DIM A B C D E
F G H I J K L D
3
4
MILLIMETERS _ 2.9 + 0.2 1.6+0.2/-0.1 _ 0.70 + 0.05 _ 0.4 + 0.1 2.8+0.2/-0.3 _ 1.9 + 0.2
0.95 _ 0.16 + 0.05 0.00-0.10 0.25+0.25/-0.15 0.60 0.55
A
F L G
Built in a open circuits protection for the LEDs fail. Drives Up to Five LEDs Built in a N-channel MOSFET Switch. Fast 1.1MHz(typ.) Switching Frequency. Wide Dimming control range : 12%~100%. Automatic Soft-Start Bulit in OVD (Over voltage protection.) Extremely low height & small Packaging.
J
APPLICATIONS
Celluar Phones Smart Phones PDAs Digital Cameras MP3 Players, Color Displays
C D
A
A
E
Marking
6
Type Name
5
4
Lot No.
DIM A B C D E F G H I J
MILLIMETERS _ 2.00 + 0.10 _ 1.60 + 0.10 _ 0.30 + 0.05 0.65 Typ _ 1.00 + 0.10 _ 0.25 + 0.10 0.25 _ 0.75 + 0.05 0.0 + 0.05 0.20 Ref
J
403
Type Name
403
TDFN-6
1 2 3
Lot No.
KAB3403DN
KAB3403T
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I H
F
I J
H
TS6
B
G
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KAB3403T/DN
TYPICAL APPLICATION
L1 4.7H ~ 22H VIN D1 VOUT
CONVERSION EFFICIENCY
90
LED1 OVD LED2 LED3 LED4 C2 1F
EFFICIENCY (%)
C1 1F
VCC
SW
85 80 75 70 65 60 0 5 10 15 20 25 30 35
KAB3403T/DN
ON OFF Shutdown and Dimming control CTL GND FB
VFB R1 16
3.0V 3.6V 4.3V 5.0V
LOAD CURRENT (mA)
BLOCK DIAGRAM
VCC
SW OVD
I sens Comparator
R S
Q
Driver
OVER VOLTAGE DETECTION
Ramp Generator
1.1MHz Oscillator
GND
Soft Start
FB
Error Amp Reference Generator Vref (320mV) Shutdown
CTL
Dimming
figure 2. KAB3403T/DN Block Diagram
PIN FUNCTIONS
NO. SYMBOL KAB3403T 6 5 4 3 2 KAB3403DN 1 2 3 4 5 VCC GND FB SW OVD Input supply pin. Must be locally bypassed. Ground pin. Connect directly to local ground plane, Feedback pin. Reference voltage is 320mV. Connect cathode of lowest LED and resistor here. Switch pin. Connect inductor/diode here. Minimize trace area at this pin to reduce EMI. Over output voltage detect pin. Connect cathode of schottky diode and anode of highest LED. Control pin : Shutdown or dimming control. Connect external enable or dimming circuits. 1 6 CTL Shutdown mode (IF = 0) : VCTL<1.0V Dimming control mode : (IF = 12% ~ 100%, depend on VCTL) FUNCTION AND CONNECTION.
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KAB3403T/DN
MAXIMUM RATINGS (Ta=25 )
SYMBOL VCC VSW VOVD Topr Tstg Tj RATING -0.3 ~ 6.0 -0.3 ~ 22 -0.3 ~ 22 -40 ~ 85 -55 ~ 150 150 UNIT V V V
CHARACTERISTICS Input Voltage Switching pin Voltage OVD pin Voltage Operating temperature range Storage temperature range Maximum Junction temperature
RECOMMENDED OPERATING CONDITIONS (Topr=-40~85
CHARACTERISTICS Input Voltage CTL pin voltage for full LED current CTL pin voltage to shutdown chip LED Current CTL Response Delay (When Power ON.) SYMBOL VCC VCTL H VCC=3.0V VCTL L IF Tpd CTL
)
MIN. 2.7 2.7 TYP. 20 MAX. 5.5 0.5 UNIT V V V
CONDITION -
VCC=3.6V, RSENSE=16 , Topr =25 , Five LED -
2
ELECTRICAL CHARACTERISTIC (Topr=-40~85 , VCC=2.7~5.5V, RSENSE=16
CHARACTERISTICS Input Voltage Supply Current Feedback Voltage CTL Pin Bias Current Switching Frequency Switching Pin Current Switch Leak Current OVD Pin Voltage OVD Pin Leak Current Switching Pin OVP CTL pin voltage for Full LED Current CTL pin voltage to shutdown Chip Feedback Bias Current Maximum Duty Cycle SYMBOL VCC ICC VFB ICTL fOSC IO(SW) IOZ(SW) VOVD IOZ(OVD) VO(SW) VCTL H VCTL L IFB Dmax
, unless otherwise noted.)
CONDITION VCC = 3.6V, VCTL=3.6V VCTL = 0V VCC=VCTL=3.0V, Topr = 25 , L =4.7 H VCC = 3.0V, VCTL = 3.0V VCTL = 3.0V MIN. 2.7 304 0.77 VOVD = 18V VCC = 3.0V 19 25 2.7 85 TYP. 0.9 0.5 320 5 1.1 400 0.5 21 0.5 0.5 90 MAX. 5.5 1.5 1 336 10 1.43 1 23 1 0.5 1 % V V V V UNIT V
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KAB3403T/DN
Inductor Section A 10uH inductor is sufficient for most application. The efficiency comparision of different value inductors help you design your application circuits.
90 88 VIN=3.6, 4LED Inductor=Murata 86 84 82 80 78 76 74 72 70 68 66 64 62 60 0 5 15 20 10
The KAB3403T/DN will then switch at a high duty cycle resulting in a high output voltage. But Internal Over Voltage Protection Circuits prevent output voltage ascending over OVD pin voltage(19V ~ 23V see Fig 4). This circuits is valid when driving up to 4 LEDs in series. But, when driving more than 4 LEDs in series, Normal output voltage could be over OVD pin voltage. In this case, zener diode can be used to check connect of OVD pin to LED anode.(see Fig 5) [Recommended Zener diode : KDZ3.0V]
L1 4.7H ~ 22H VIN D1
EFFICIENCY (%)
10H 4.7H
LED1 VCC SW OVD LED2 LED3 LED4 CTL C1 1F GND R1 16 FB C2 1F
25
30
35
LOAD CURRENT (mA) Figure3. Efficiency Comparison of different value inductors Inductor Section A 1uF input capacitor and output capacitor above 1uF are sufficient for most KAB3403T/DN application. Diode Selection For Diode Selection, both forward voltage drop and diode capacitance need to be considered. Schottky diodes with higher current ratings usually have lower forward voltage and larger diode capacitance, which can cause significant switching losses. A schottky diode rated at 100mA to 200mA is sufficient for most KAB3403T/DN applications. Part No. KDR730E Reverse Forward Voltage (V) Current (mA) 30 200 mA Voltage Drop (V) 0.6V (max) at 200 mA 0.5V(max) at 200 mA 0.5V(max) at 500 mA Package
1.60 1.20 0.80 1 0.30
KAB3403T/DN
Figure4. 4LEDs driver with Open-circuit protection.
L1 4.7H~22H VIN LED1 SW OVD DZ VCC LED2 LED3 LED4 C2 1F D1
KAB3403T/DN
CTL C1 1F GND FB
LED5 LED6
2
1.60 1.20 0.80 1 2 0.30
R1 16
KDR720E
30
200 mA
1.25
Table1. Recommended Schottky Diode
0.30
KDR412
20
500 mA
2.50 1.70
Figure5. 6LEDs driver with Open-circuit protection. Dimming Control There are 4 different type of dimming control circuits;
LED Current Control The LED current is controlled by the feedback resistor (RSENSE in Figure 1). The feedback reference is 320mV. The LED current is 320mV/RSENSE . The tolerance of LED Current is depends on tolerance of RSENSE and feedback reference. Open-Circuits Protection In the case of output open circuit, when LEDs are disconnected from the circuit or the LEDs fail, the feedback voltage will be zero.
1. Using a DC Voltage to CTL pin
Description Rate Of the LED Current Example : RSENSE = 16 VCTL 0V~0.5V 1V~2.5V VCTL>2.5V 0 0 25 ~ 100 5 ~ 20 100 20 UNIT % mA
Table 2 CTL pin Voltage vs ILED
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KAB3403T/DN
L1 4.7H ~ 22H VIN VCC C1 1F SW OVD LED1 LED2 LED3 LED4 CTL GND R1 16 FB C2 1F VIN LED1 VCC SW OVD LED2 LED3 LED4 CTL C1 1F Rsence FB R1 KTK5132V
LOGIC
4. Using a Logic Signal to FB pin.
D1
For application that need to adjust the LED current in discrete steps. A logic signal can be used as shown in Figure 9.
L1 4.7H ~ 22H D1
KAB3403T/DN
DC
KAB3403T/DN
GND
C2 1F
Figure6. Using a DC Signal to CTL pin. 2. Using a filtered PWM Signal to CTL pin. The filtered PWM signal can be considered as an adjustable DC voltage. It can be used to replace the variable DC Voltage source in dimming control. The circuit is shown in Figure 7
L1 4.7H ~ 22H VIN LED1 C1 1F VCC SW OVD LED2 LED3 R1 15k PWM Signal C2 1F D1
Figure9. Using a Logic Signal to FB pin.
KAB3403T/DN
LED4 CTL FB GND Rsence D1 LED1 VCC SW OVD LED2 LED3 LED4 GND FB R2 Rsence R1
C3 1F
Figure7. Using a filtered PWM Signal to CTL pin. 3. Using a DC Voltage to FB pin. The dimming control using a DC control voltage to FB pin of the KAB3403T/DN is shown in Figure. The LED current can be varied applying a DC voltage to the FB pin. The voltage can come from a filtered PWM signal. It can be used to replace the variable DC voltage source in dimming control.
L1 4.7H ~ 22H VIN
KAB3403T/DN
CTL C1 1F
C2 1F
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KAB3403T/DN
VFB vs VCTL
350
VCC = 3.6V
VFB vs Duty
350 300 250
300 250
VFB (mV)
200 150 100 50 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
VFB (mV)
200 150 100 50 0 0 10 20 30 40 50 60 70 80 90 100 110
VCTL (V)
Duty (%)
Switching Frequency vs VIN
1.5 350 300
VFB vs VIN
Switching Frequency (MHz)
1.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 2.5 3.0 3.5 4.0 4.5 5.5 5.0 100 2.0 2.5 3.0 3.5 4.0 4.5 5.5 5.0 150
VFB (mV)
250 200
VIN (V)
VIN (V)
Inrush Current
VIN=3.6V ILED=20A
Efficicncy vs Temperature
95
EN 5V/Div VOUT
90 85
VIN=4.3V VIN=3.6V VIN=3.0V
Efficicncy (%)
2V/Div
80 75 70 65 60 55 50 -60 -10
IIN 100mA/Div
Time (40s/Div)
40
90
140
Temperature ( C)
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KAB3403T/DN
Switching Frequency vs Temperature
1.8 500 400
Quiescent Current vs Temperature
Switching Frequency (MHz)
1.6 1.4 1.2
V IN=4.3V
ICC (A)
V IN=3.6V VIN=2.7V
1.0 0.8 0.6 0.4 0.2 0 -50 0 50 100
300 200 100 0 -50
-10
30
70
110
Temperature ( C)
Temperature ( C)
APPLICATION CIRCUIT
DC-DC Converter
VIN VIN L1 10H D1 KDR730E
EFFICIENCY
16V/20mA
100 80 60 40 20 0 0 10 20 30 40
R2 740k VCC CIN 1F OVD FB GND FB R3 15k COUT 1F SW
CTL
EFFICIENCY (%)
3.2V 3.6V 4.2V
50
LOAD CURRENT (mA)
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