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TPS61181RTE
Schematic [ru]
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Texas Instruments TPS61180RTE, TPS61181RTE, TPS61182RTE Schematic [ru]

TPS61180/1/2
www.ti.com
SLVS801E –DECEMBER 2007–REVISED APRIL 2013
WLED DRIVER FOR NOTEBOOK DISPLAY
Check for Samples: TPS61180/1/2
1

FEATURES

• 5 V to 24 V Input Voltage • Driver for Input/Output Isolation PFET
• 1.0 MHz/1.3 MHz Switching Frequency • Over Voltage Protection
• Boost Output Auto-Adaptive to WLED Voltages • WLED Open/Short Protection
• Small External Components • Built-in Soft Start
• Integrated Loop Compensation • 16L 3 mm×3 mm QFN
• Six Current Sink of 25 mA
• Up to 10 WLED in Series
• Less Than 3% Current Matching and Accuracy
• Up to 1000:1 PWM Brightness DImming Range
• Minimized Output Ripple Under PWM Dimming

DESCRIPTION

The TPS61180/1/2 ICs provide highly integrated solutions for media size LCD backlight. These devices have a built-in high efficiency boost regulator with integrated 1.5A/40V power MOSFET. The six current sink regulators provide high precision current regulation and matching. In total, the device can support up to 60 WLED. In addition, the boost output automatically adjusts its voltage to the WLED forward voltage to improve efficiency.
The devices support pulse width modulation (PWM) brightness dimming. During dimming, the WLED current is turned on/off at the duty cycle and frequency determined by the PWM signal input on the DCRTL pin. One potential issue of PWM dimming is audible noises from the output ceramic capacitors. The TPS61180/1/2 family is designed to minimize this output AC ripple across a wide dimming duty cycle and frequency range; therefore, reducing the audible noise.
The TPS61180/1/2 ICs provide a driver output for an external PFET connected between the input and inductor. During short circuit or over-current conditions, the ICs turn off the external PFET and disconnect the battery from the WLEDs. The PFET is also turned off during IC shutdown (true shutdown) to prevent any leakage current of the battery. The device also integrates over-voltage protection, soft-start and thermal shutdown.
The TPS61180 IC requires external 3.3V IC supply, while TPS61181 and TPS61182 ICs have a built-in linear regulator for the IC supply. All the devices are in a 3×3 mm QFN package.

APPLICATIONS

• Notebook LCD Display Backlight
• UMPC LCD Display Backlight
• Backlight for Media Form Factor LCD display
1
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 © 2007–2013, Texas Instruments Incorporated
L1
10 Hm
Q1
D2
D1
C2
4.7 Fm
IFB1
IFB2
IFB3
IFB4 IFB5
IFB6
V
O
SWFault
V
BAT
Cin
EN
DCTRL
ISET
PGND
GND
R1 62kW
TPS61181/2
C4
0.1 Fm
Optional
5 Vto 24 V
C1
4.7 Fm
10 WLEDinseries,120 mA total
EN
PWMDimming
R2
51Ω
C3
1 Fm
R3
100kW
TPS61180/1/2
SLVS801E –DECEMBER 2007–REVISED APRIL 2013
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
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Figure 1. TPS61181/2 TYPICAL APPLICATION
ORDERING INFORMATION
PACKAGE IC SUPPLY SWITCHING FREQUENCY PACKAGE MARKING
TPS61180RTE External 3.3 V 1.0 MHz CCG TPS61181RTE Built-in LDO 1.0 MHz CCH TPS61182RTE Built-in LDO 1.3 MHz CCI
(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.
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Product Folder Links: TPS61180/1/2
(TYP)
(1)
DCTRL
IFB2
IFB1
IFB3
Cin
SW
V
O
5
EN
ISET
Fault
9
PGND
IFB5
13
1
GND
IFB6
IFB4
2
3
4
6
7 8
10
11
12
141516
QFNPACKAGE
16Pin3x3
(TOP VIEW)
V
BAT
TPS61180/1/2
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SLVS801E –DECEMBER 2007–REVISED APRIL 2013

PINOUT

TERMINAL FUNCTIONS
TERMINAL I/O DESCRIPTION
NO. NAME
1 PGND I Power ground of the IC. Internally, it connects to the source of the PWM switch. 2 SW I This pin connects to the drain of the internal PWM switch, external Schottky diode and inductor. 3 V
4 V 5 ISET I The resistor on this pin programs the WLED output current. 6 Cin I Supply voltage of the IC. For TPS61181/2, it is the output of the internal LDO. Connect 0.1 μF bypass
7, 8, 9 IFB1-IFB3 I Current sink regulation inputs. They are connected to the cathode of WLEDs. The PWM loop regulates
12, 13, 14 IFB4-IFB6 the lowest V
10 GND I Signal ground of the IC. 11 DCTRL I Dimming control logic input. The dimming frequency range is 100 Hz to 1 kHz. 15 EN I The enable pin to the IC. For TPS61181/2, a logic high signal turns on the internal LDO and enables the
16 Fault I Gate driver output for an external PFET used for fault protection. It can also be used as signal output for
BAT
O
I This pin is connected to the battery supply. It provides the pull-up voltage for the Fault pin and battery
voltage signal. For TPS61181/2, this is also the input to the internal LDO.
O This pin monitors the output of the boost regulator. Connect this pin to the anode of the WLED strings.
capacitor to this pin. For TPS61180, connect an external 3.3 V supply to power the IC.
to 400 mV. Each channel is limited to 25 mA current.
IFB
IC. Therefore, do not connect the EN pin to the Cin pin.
system fault report.
Copyright © 2007–2013, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Links: TPS61180/1/2
C2
4.7 Fm
IFB1 IFB2 IFB3
IFB4 IFB5 IFB6
V
O
SW
PGND
GND
10 WLEDinseries,120 mA total
Current
Regulator
Dimming
Control
L1
10 Hm
Q1
D2
Cin
C4
0.1 Fm
Optional
CurrentMode
PWMControl
IFB 1...IFB 6
Fault
Protection
5 Vto 24 V
C1
4.7 Fm
R3
51 W
C3
1 Fm
InternalRegulator
(TPS61181/2only)
EN
PWMDimming
Fault
ISET
V
BAT
EN
DCTRL
D1
R1
R3
100kW
TPS61180/1/2
SLVS801E –DECEMBER 2007–REVISED APRIL 2013

FUNCTIONAL BLOCK DIAGRAM

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ABSOLUTE MAXIMUM RATINGS

(1)
VALUE UNIT
–0.3 to 24 V
–0.3 to 3.6 V
–0.3 to 40 V –0.3 to 20 V
–0.3 to 7 V
over operating free-air temperature range (unless otherwise noted)
Voltages on pin V Voltage on pin Cin
BAT
(2)
and Fault
Voltage on pin SW and V Voltage on pin IFB1 to IFB6 Voltage on all other pins Continuous power dissipation See Dissipation Rating Table Operating junction temperature range –40 to 150 °C Storage temperature range –65 to 150 °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

TPS61180/1/2RTE TPS61180/1/2RTE
(1) The JEDEC low-K (1s) board used to derive this data was a 3in×3in, two-layer board with 2-ounce copper traces on top of the board.
PACKAGE R
(2) The JEDEC high-K (2s2p) board used to derive this data was a 3in×3in, multilayer board with 1-ounce internal power and ground.
(2)
(2)
O
(2)
(2)
(1) (2)
θJA
POWER RATING POWER RATING POWER RATING
TA≤ 25°C TA= 70°C TA= 85°C
270°C/W 370 mW 204 mW 148 mW
48.7°C/W 2.05 W 1.13 W 821 mW
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Product Folder Links: TPS61180/1/2
TPS61180/1/2
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SLVS801E –DECEMBER 2007–REVISED APRIL 2013

RECOMMENDED OPERATING CONDITIONS

MIN TYP MAX UNIT
V C V
Battery input voltage range 5.0 24 V
bat
IC supply voltage range 2.7 3.6 V
in
Output voltage range Vin 38 V
O
L Inductor 4.7 10 μH C C F T T
Input capacitor 1 μF
I
Output capacitor 2.2 10 μF
O
PWM dimming frequency 0.1 1 kHz
PWM
Operating ambient temperature –40 85 °C
A
Operating junction temperature –40 125 °C
J

ELECTRICAL CHARACTERISTICS

V
= 10.8 V, 0.1 μF at Cin, EN = Logic High, IFB current = 15m A, IFB voltage = 500 mV, TA= –40°C to 85°C, typical
BAT
values are at TA= 25°C (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY CURRENT
V
BAT
V
cc
V
cin
I
q_bat
I
q_Vcc
I
Q_sw
I
SD
V
cc_UVLO
V
bat_UVLO
V
bat_hys
EN AND DCTRL
V
H
V
L
R
PD
T
SD
CURRENT REGULATION
V
ISET
K
ISET
IFB Current accuracy Riset = 62K 19.4 20 20.6 mA K
m
I
leak
I
IFB_MAX
BOOST OUTPUT REGULATION
V
IFB_L
V
IFB_H
V
reg_L
V
o_step
POWER SWITCH
R
PWM_SW
R
start
Battery input voltage range 5.0 24 V IC supply voltage range TPS61180 only 2.7 3.15 3.6 V Cin pin output voltage TPS61181/TPS61182 only 2.7 3.15 3.6 V
Operating quiescent current into V
BAT
Device enable, switching TPS61180 1 no load, Vin = 24 V
TPS61181/2 3 Operating quiescent current into Cin pin TPS61180 only 2 mA Operating quiescent current into V
O
VO= 35V 50 μA Shutdown current EN=GND 2 18 μA Cin pin under-voltage lockout threshold TPS61180 only 2.2 2.4 V V
under-voltage lockout threshold When Vin ramp down 4.2 4.5 V
BAT
V
under-voltage lockout hysteresis When Vin ramp up 300 mV
BAT
Logic high voltage 1.2 V Logic low voltage 0.4 V Pull down resistor on both pins 400 800 1600 kΩ
EN pulse width to shutdown EN high to low ms
TPS61180/1 27 37 TPS61182 21 28
ISET pin voltage 1.204 1.229 1.253 V Current multiple Iout/ISET ISET current = 15 μA and 25 μA 970 1000 1030
(I
max–Imin
)/I
AVG
ISET current = 15 μA and 25 μA 1 2.5 % IFB pin leakage current IFB voltage = 20 V on all pins 3 μA Current sink max output current IFB = 425 mV 25 mA
VOdial up threshold Measured on V VOdial down threshold Measured on V
(min) 400 mV
IFB
(min) 700 mV
IFB
Min Vout regulation voltage 16 V VOstepping voltage 100 150 mV
PWM FET on-resistance VCC= 3.3 V for TPS61180 0.2 0.45 Ω Start up charging resistance VO= 0 V 100 300 Ω
mA
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Product Folder Links: TPS61180/1/2
TPS61180/1/2
SLVS801E –DECEMBER 2007–REVISED APRIL 2013
ELECTRICAL CHARACTERISTICS (continued)
V
= 10.8 V, 0.1 μF at Cin, EN = Logic High, IFB current = 15m A, IFB voltage = 500 mV, TA= –40°C to 85°C, typical
BAT
values are at TA= 25°C (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
start_r
I
LN_NFET
OSCILLATOR
f
S
D
max
D
min
OS, SC, OVP AND SS
I
LIM
V
ovp
V
ovp_IFB
V
sc
V
sc_dly
V
IFB_nouse
Fault OUTPUT
V
fault_high
V
fault_low
THERMAL SHUTDOWN
T
shutdown
T
hysteresis
Isolation FET start up threshold VIN–VO, VOramp up 1.2 2 V PWM FET leakage current VSW= 35 V, TA= 25°C 1 μA
Oscillator frequency MHz
TPS61182 1.2 1.3 1.5
TPS61180/1 0.9 1.0 1.2 Maximum duty cycle IFB = 0 V 85 94 %
Minimum duty cycle %
N-Channel MOSFET current limit D = D
TPS61182 8
TPS61180/1 7
max
1.5 3 A VOovervoltage threshold Measured on the VOpin 38 39 40 V IFB overvoltage threshold Measured on the IFBx pin 15 17 20 V Short circuit detection threshold VIN-VO, VOramp down 1.7 2.5 V Short circuit detection delay during start up 32 ms IFB no use detection threshold TPS61180 Only 0.6 V
Fault high voltage Measured as V Fault low voltage Measured as V
= 15 V
bat–VFault bat–VFault
, sink 0.1mA, Vin 6 8 10 V
0.1 V
Thermal shutdown threshold 160 °C Thermal shutdown threshold hysteresis 15 °C
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Product Folder Links: TPS61180/1/2
80
82
84
86
88
90
92
94
96
98
100
0 25 50
75
100
125
150
I -OutputCurrent-mA
O
Efficiency-%
V =11V
bat
V =28.8V
O
V =17.6V
O
V =23.2V
O
80
82
84
86
88
90
92
94
96
98
100
Efficiency-%
0 25 50
75
100
125
150
I -OutputCurrent-mA
O
V =11V
bat
V =31.6V
O
V =36.2V
O
TPS61180/1/2
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SLVS801E –DECEMBER 2007–REVISED APRIL 2013

TYPICAL CHARACTERISTICS

Table of Graphs Figure
Load Efficiency TPS61181 V Load Efficiency TPS61181 V Load Efficiency TPS61181 V Load Efficiency TPS61181 V PWM Dimming Efficiency V PWM Dimming Efficiency V Dimming Linearity V Dimming Linearity V Output Ripple VO=28.8V; I Switching Waveform V Output Ripple at PWM Dimming V Short Circuit Protection V Open WLED Protection V Startup Waveform V
EFFICIENCY EFFICIENCY
OUTPUT CURRENT OUTPUT CURRENT
vs vs
= 11V; VO=28.8V, 23.2V and 17.6V; L=4.7uH Figure 2
bat
= 11V; VO=36.2V and 31.6V; L=4.7uH Figure 3
bat
= 11V; VO=28.8V; L=4.7uH, L=10uH Figure 4
bat
= 7V, 11V and 19V; VO=28.8V; L=4.7uH Figure 5
bat
= 7V, 11V and 19V; VO=28.8V; I
bat
= 7V, 11V and 19V; VO=36.2V; I
bat
= 11V; VO=28.8V; I
bat
= 11V; VO=28.8V; I
bat
= 20μA; PWM Freq = 200Hz; Duty = 50% Figure 10
set
= 11V; I
bat
= 11V; I
bat
= 11V; I
bat
= 11V; I
bat
= 11V; I
bat
= 20μA Figure 11
set
= 20μA; PWM Freq = 200Hz; Duty = 50%; CO=4.7μF Figure 12
set
= 20μA Figure 13
set
= 20μA Figure 14
set
= 20μA Figure 15
set
= 20μA; PWM Freq = 1kHz Figure 8
set
= 20μA; PWM Freq = 200Hz Figure 9
set
= 20μA; PWM Freq = 200Hz Figure 6
set
= 20μA; PWM Freq = 200Hz Figure 7
set
Copyright © 2007–2013, Texas Instruments Incorporated Submit Documentation Feedback 7
Figure 2. Figure 3.
Product Folder Links: TPS61180/1/2
50
60
70
80
90
100
0 10 20 30 40 50 60 70 80 90 100
PWMDimmingDutyCycle-%
V =11V
bat
Efficiency-%
V =19V
bat
V =7V
bat
V =28.8V,TPS61181
ISET=20 A, DimmingFrequency=200Hz
O
m
50
60
70
80
90
100
0 10 20 30 40 50 60 70 80 90 100
PWMDimmingDutyCycle-%
Efficiency-%
V =36.2V-TPS61181
ISET=20 A DimmingFrequency=200Hz
O
m
V =19V
bat
V =11V
bat
V =7V
bat
80
82
84
86
88
90
92
94
96
98
100
Efficiency-%
0 25 50
75
100
125
150
I -OutputCurrent-mA
O
V =11V
bat
10 Hm
4.7 Hm
V =28.8V,
TPS61181
O
80
82
84
86
88
90
92
94
96
98
100
Efficiency-%
0 25 50
75
100
125
150
I -OutputCurrent-mA
O
V =7V
bat
V =19V
bat
V =11V
bat
V =28.8V,
TPS61181
O
TPS61180/1/2
SLVS801E –DECEMBER 2007–REVISED APRIL 2013
EFFICIENCY EFFICIENCY
OUTPUT CURRENT OUTPUT CURRENT
vs vs
Figure 4. Figure 5.
EFFICIENCY EFFICIENCY
DIMMING DUTY CYCLE DIMMING DUTY CYCLE
vs vs
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Figure 6. Figure 7.
Product Folder Links: TPS61180/1/2
50
100
150
200
250
300
350
5 7.5 12.5 15 17.5 20.0
OutputRipplePeaktoPeak-mV
10
V -V
bat
V =28.8V,TPS61181
ISET=20 A, DimmingFrequency=200Hz
O
m
L =4.7 Hm
L =10 Hm
0
20
40
60
80
100
120
140
0 10 20 30 40 50 60 70 80 90 100
PWMDimmingDutyCycle-%
I -OutputCurrent-mA
O
TPS61181 ISET=20 A, DimmingFrequency=200Hz
m
0
20
40
60
80
100
120
140
0 10 20 30 40 50 60 70 80 90 100
PWMDimmingDutyCycle-%
I -OutputCurrent-mA
O
TPS61181 ISET=20 A, DimmingFrequency=1kHz
m
TPS61180/1/2
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SLVS801E –DECEMBER 2007–REVISED APRIL 2013
PWM DIMMING linearity 1kHz PWM DIMMING LINEARITY 200Hz
Figure 8. Figure 9.
PWM DIMMING OUTPUT RIPPLE CO=4.7μF
vs
INPUT VOLTAGE
Copyright © 2007–2013, Texas Instruments Incorporated Submit Documentation Feedback 9
Figure 10.
Product Folder Links: TPS61180/1/2
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