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TPS 61150 A
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Texas Instruments TPS 61150 A INSTALLATION INSTRUCTIONS

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DUAL OUTPUT BOOST WLED DRIVER
USING SINGLE INDUCTOR
TPS61150A
SLVS706 – OCTOBER 2006

FEATURES

• 2.5V to 6V Input Voltage Range
• 0.7A Integrated Switch
• Built-in Power Diode
• 1.2MHz Fixed PWM Frequency
• Individually Programmable Output Current
• Input-to-Output Isolation
• Built-in Soft Start
• 27V Overvoltage Protection
• 3% at 15mA Matching between Two Current
Strings, Improvement from TPS61150/1
• Up to 83% Efficiency
• Up to 30kHz PWM Dimming Frequency
• Availiable in a 10 Pin, 3 × 3 mm QFN Package

APPLICATIONS

• Up to 14 WLED Driver for Media Form Factor
Display
• Sub and Main Display Backlight in Clam Shell
Phones
• Display and Keypad Backlight in Portable
Equipment
The two current outputs are ideal for driving WLED backlight for the sub and main displays in clam shell phones. The two outputs can also be used for driving display and keypad backlights. When used together, the two outputs can drive up to 14 WLED for one large display.
In addition to the small inductor, small capacitor and 3mm x 3mm QFN package, the built-in MOSFET and diode eliminate the need for any external power devices. Overall, the IC provides an extremely compact solution with high efficiency and plenty of flexibility.

TYPICAL APPLICATION

DESCRIPTION

The TPS61150A is a high frequency boost converter with two regulated current outputs for driving WLEDs. Each current output can be individually programmed through external resistors. There is dedicated selection pin for each output, so the two outputs can be turned on separately or simultaneously. The output current can be reduced by a pulse width modulation (PWM) signal on the select pins or an analog voltage on the ISET pin. The boost regulator runs at 1.2MHz fixed switching frequency to reduce output ripple and avoid audible noises associated with PFM control.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
Copyright © 2006, Texas Instruments Incorporated
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1
2
3
4
5
10
9
8
7
6
IFB1
ISET
SEL1
SEL2
VIN
IFB2
ISET2
GND
IOUT
SW
QFNPACKAGE
(TOP VIEW)
Exposed
Thermal
Pad
TPS61150A
SLVS706 – OCTOBER 2006
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
ORDERING INFORMATION
T
A
–40 to 85 ° C TPS61150ADRCR 28V BTK –40 to 85 ° C TPS61150ADRCT 28V BTK
(1) For the most current package and ordering information, see the Package Option Addendum at the end
of this document, or see the TI website at www.ti.com .
PACKAGE OVP (Typ.) PACKAGE MARKING
(1)

DEVICE INFORMATION

TERMINAL FUNCTIONS
TERMINAL
NAME NO.
VIN 5 I below the undervoltage lockout threshold, the IC turns off and disables outputs; thereby disconnecting the
GND 8 O Ground. Connect the input and output capacitors as close as possible to this pin. SW 6 I Switching node of the IC. IOUT 7 O Constant current supply output. IOUT is directly connected to the boost converter output.
IFB1, IFB2 10 I ISET1, 2
ISET2 9 SEL1, 3
SEL2 4 Thermal Pad
I/O DESCRIPTION
Input pin. VIN provides the current to the boost power stage, and also powers the IC circuit. When VIN is WLEDs from the input.
Return path for the IOUT regulation. The current regulator is connected to this pin, and it can be disabled to open the current path.
I Output current programming. The resistor connected to the pin programs the corresponding output current.
I Mode selection. See Table 1 for details.
The thermal pad should be soldered to the analog ground. If possible, use the thermal pad to connect to ground plane for ideal power dissipation.
2
Table 1. TPS61150A Mode Selection
SEL1 SEL2 IFB1 IFB2
H L Enable Disable L H Disable Enable H H Enable Enable L L IC Shutdown
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FUNCTIONAL BLOCK DIAGRAM

VIN
IFB2
IOUT
SW
Error
Amplifier
Current
Sink
SEL1
SEL2
GND
ISET2
TPS61150A
Current
Sink
0.33V
IFB1
ISET1
+
−
1.2MHzCurrent ModeControl
PWM
TPS61150A
SLVS706 – OCTOBER 2006

ABSOLUTE MAXIMUM RATINGS

(1)
over operating free-air temperature range (unless otherwise noted)
VALUE UNIT
Supply voltages on pin VIN Voltages on pins SEL1/2, ISET1/2 Voltage on pin IOUT, SW, IFB1 and IFB2 Continuous power dissipation See Dissipation Rating Table Operating junction temperature range –40 to 150 ° C Storage temperature range –65 to 150 ° C Lead Temperature (soldering, 10 sec) 260 ° C
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) All voltage values are with respect to network ground terminal.

DISSIPATION RATINGS

PACKAGE R
(1)
QFN
(2)
QFN
(2 48.7
(1) Soldered PowerPAD on a standard 2-layer PCB without vias for thermal pad. (2) Soldered PowerPAD on a standard 4-layer PCB with vias for thermal pad .
(2)
(2)
(2)
TA≤ 25 ° C TA= 70 ° C TA= 85 ° C
θ JA
o
270
C/W 370mW 204mW 148mW
o
C/W 2.05W 1.13W 821mW
POWER RATING POWER RATING POWER RATING
–0.3 to 7 V –0.3 to 7 V
30 V
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TPS61150A
SLVS706 – OCTOBER 2006

RECOMMENDED OPERATING CONDITIONS

over operating free-air temperature range (unless otherwise noted)
V
I
V
O
L Inductor C
I
C
O
T
A
T
J
(1) See Application Section for further information.
Input voltage range 2.5 6.0 V Output voltage range VIN 27 V
(1)
Input capacitor Output capacitor
(1)
(1)
Operating ambient temperature –40 85 ° C Operating junction temperature –40 125 ° C
MIN NOM MAX UNIT
10 µ H 1 µ F 1 µ F
4
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ELECTRICAL CHARACTERISTICS

VIN = 3.6V, SELx = VIN, Rset = 80k Ω , V noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY CURRENT
V
I
I
Q
I
SD
V
UVLO
V
hys
ENABLE AND SOFT START
V
(selh)
V
(sell)
R
(en)
t
(off)
I
(ss)
t
(ss)
t
(ss_en)
CURRENT FEEDBACK
V
(ISET)
K
ISET
K
M
V
(IFB)
V
hys(IFB_L)
t
I(sink)
I
lkg
POWER SWITCH AND DIODE
R
DS(ON)
I
lkg(N_NFET)
V
(F)
OC AND OVP
I
L
I
(IFB_MAX)
V
ovp
V
ovp_hys
PWM AND PFM CONTROL
F
S
D
max
THERMAL SHUTDOWN
T
shutdown
T
hys
Input voltage range 2.5 6.0 V Operating quiescent current into VIN Device PWM switching no load 2 mA Shutdown current SELx = GND, TA= 25 ° C 1.7 1.9 µ A
Under-voltage lockout threshold VIN falling 1.65 1.8 V Under-voltage lockout hysterisis 70 mV
SEL logic high voltage VI= 2.5V to 6V 1.2 V SEL logic low voltage VI= 2.5V to 6V 0.4 V SEL pull down resistor 300 700 k Ω SEL pulse width to disable SELx high to low 40 ms IFB soft start current steps 16 Soft start time step Measured as clock divider 64 Soft start enable time Time between falling and rising of two adjacent 40 ms
ISET pin voltage 1.204 1.229 1.254 V Current multipler, I
Current matching, (2 × |I
/I
, I
fb1
set1
–I
fb1
IFB regulation voltage 300 330 360 mV IFB low threshold hysteresis 60 mV Current sink settle time measured from 6 µ s
SELx rising edge
(1)
IFB pin leakage current IFB voltage = 25V 1 µ A
N-channel MOSFET on-resistance VIN= V N-channel leakage current V Power diode forward voltage Diode current = 0.7A 0.83 1.0 V
N-Channel MOSFET current limit A
Current sink max output current IFB current = 330mV 34 mA Overvoltage threshold 27 28 29 V Overvoltage hysteresis 550 mV
Oscillator frequency 1.0 1.2 1.5 MHz Maximum duty cycle Feedback voltage = 1.0V 89% 93%
Thermal shutdown threshold 160 ° C Thermal shutdown threshold hysteresis 15 ° C
TPS61150A
SLVS706 – OCTOBER 2006
= 15V, TA= –40 ° C to 85 ° C, typical values are at TA= 25 ° C (unless otherwise
(IOUT)
SELx = GND 2.7 3
SELx pulses
/I
fb2
set2
|)/(I
fb2
fb1
ISET current = 16.7 µ A 883 920 957 ISET current = 1.2 µ A 736 920 1104
+I
) ISET current = 16.7 µ A 0% 3%
fb2
ISET current = 1.2 µ A 0% 20%
= 3.6V 0.6 0.9 Ω
GS
= 25V 1 µ A
DS
Dual output, IOUT= 15V, Duty cycle = 76% 0.75 1.0 1.25 Single output , IOUT= 15V, Duty cycle = 76% 0.40 0.55 0.7
(1) This specification determines the minimum on time required for PWM dimming for desirable linearity. The maximum PWM dimming
frequency can be calculated from the minimum duty cycle required in the application.
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0
100
200
300
400
500
600
10 20 30 40 50 60 70 80 90
DutyCycle-%
CurrentLimit-mA
V =4.2V
I
V =3.6V
I
V =3V
I
0
200
400
600
800
1000
1200
10 20 30 40 50 60 70 80 90
DutyCycle-%
CurrentLimit-mA
VI=4.2V
V =3.6V
I
V =3V
I
TPS61150A
SLVS706 – OCTOBER 2006

TYPICAL CHARACTERISTICS

Table of Graphs

Overcurrent Limit VIN = 3.0V, 3.6V, and 4.2V, single and dual output 1,2 WLED efficiency VIN = 3.3V, 3.6V and 4.2V, 3 WLED, WLED voltage = 11V 3 WLED efficiency VIN = 3.3V, 3.6V and 4.2V, 4 WLED, WLED voltage = 15V 4 WLED efficiency VIN = 3.3V, 3.6V and 4.2V, 5 WLED, WLED voltage = 19V 5 WLED efficiency VIN = 3.3V, 3.6V and 4.2V, 6 WLED, WLED voltage = 23V 6 Both on efficiency VIN = 3.3V, 3.6V and 4.2V, 4 WLED on each output 7 K value over current VIN = 3.6V, I PWM dimming linearity Frequency = 20kHz and 30kHz 9 Single output PWM dimming waveform 10 Multiplexed PWM dimming waveform 11 Start up waveform 12
= 1mA to 25mA 8
WLED
FIGURES
OVERCURRENT LIMIT (SINGLE OUTPUT) OVERCURRENT LIMIT (DUAL OUTPUT)
vs vs
DUTY CYCLE DUTY CYCLE
Figure 1. Figure 2.
6
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50
60
70
80
90
0 5 10 15 20 25
WLEDCurrent-mA
Efficiency-%
WLEDVoltage=11V ,3WLED, SingleOutput
V =3.6V
I
V =3.3V
I
V =4.2V
I
50
60
70
80
90
0 5 10 15 20 25
WLEDCurrent-mA
Efficiency-%
WLEDVoltage=15V,4WLED, SingleOutput
V =4.2V
I
V =3.3V
I
V =3.6V
I
50
60
70
80
90
0 5 10 15 20 25
WLEDCurrent-mA
Efficiency-%
WLEDVoltage=19V,5WLED, SingleOutput
V =4.2V
I
V =3.3V
I
V =3.6V
I
50
60
70
80
90
0 5 10 15 20 25
WLEDCurrent-mA
Efficiency-%
WLEDVoltage=23V,6WLED, SingleOutput
V
I
V =4.2V
I
V =3.6V
I
=3.3V
EFFICIENCY EFFICIENCY
vs vs
LOAD CURRENT LOAD CURRENT
Figure 3. Figure 4.
TPS61150A
SLVS706 – OCTOBER 2006
EFFICIENCY EFFICIENCY
vs vs
LOAD CURRENT LOAD CURRENT
Figure 5. Figure 6.
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700
800
900
1000
1100
1200
0 10 20 30 40 50
WLEDCurrent-mA
V =3.6V WLED1Voltage=15V
WLED2Voltage=15V
I
KValue
WLED1
WLED2
50
60
70
80
90
0 10 20 30 40
60
50
I -TotalOutputCurrent-mA
O
Efficiency-%
WLED1Voltage=15V WLED2Voltage=15V
V =3.3V
I
V =4.2V
I
V =3.6V
I
ISEL2
5V/div ,DC
WLEDCurrent
20mA/div,DC
IOUT
1V/div ,DC
15VOffset
SW
10V/div ,DC
t-Time-20 s/divm
0
5
10
15
20
25
0
20 40 60
80 100
PWMDutycycle-%
WLEDcurrent-mA
f=20kHz
f=30kHz
TPS61150A
SLVS706 – OCTOBER 2006
BOTH ON EFFICIENCY K VALUE
vs vs
TOTAL OUTPUT CURRENT WLED CURRENT
Figure 7. Figure 8.
SINGLE OUTPUT WLED PWM
WLED BRIGHTNESS DIMMING LINEARITY BRIGHTNESS DIMMING
8
Figure 9. Figure 10.
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