3
2
4
5
DDC, DBV PACKAGE
(Top View)
1
SW
GND
FB
V
IN
EN
GND SW
V
IN
NC
EN FB
3
2
1
4
5
6
DRV PACKAGE
(Top View)
70
72
74
76
78
80
82
84
86
88
90
0.1 1 10 100
VI = 5 V
VI = 3.6 V
VI = 2.4 V
EFFICIENCY
vs
OUTPUT CURRENT
IO − Output Current − mA
Efficiency − %
V
IN
SW
FB
EN
GND
L1
10 µH
D1
R1
R2
C
FF
C
O
1 µF
V
OUT
VIN to 28 V
V
IN
1.8 V to 6 V
C
IN
4.7 µF
5
4
2
3
1
VO = 18 V
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TPS61040
TPS61041
SLVS413F –OCTOBER 2002–REVISED DECEMBER 2010
LOW-POWER DC/DC BOOST CONVERTER IN SOT-23 AND SON PACKAGES
Check for Samples: TPS61040, TPS61041
1
FEATURES
• 1.8-V to 6-V Input Voltage Range
• Adjustable Output Voltage Range up to 28 V
• 400-mA (TPS61040) and 250-mA (TPS61041)
Internal Switch Current
• Up to 1-MHz Switching Frequency
• 28-mA Typical No-Load Quiescent Current
• 1-mA Typical Shutdown Current
• Internal Soft Start
• Available in SOT23-5, TSOT23-5,
and 2 × 2 × 0.8-mm SON Packages
APPLICATIONS
• LCD Bias Supply
• White-LED Supply for LCD Backlights
• Digital Still Camera
• PDAs, Organizers, and Handheld PCs
• Cellular Phones
• Internet Audio Player
• Standard 3.3-V/5-V to 12-V Conversion
DESCRIPTION
The TPS61040/41 is a high-frequency boost
converter dedicated for small to medium LCD bias
supply and white LED backlight supplies. The device
is ideal to generate output voltages up to 28 V from a
dual cell NiMH/NiCd or a single cell Li-Ion battery.
The part can also be used to generate standard
3.3-V/5-V to 12-V power conversions.
The TPS61040/41 operates with a switching
frequency up to 1 MHz. This allows the use of small
external components using ceramic as well as
tantalum output capacitors. Together with the thin
SON package, the TPS61040/41 gives a very small
overall solution size. The TPS61040 has an internal
400 mA switch current limit, while the TPS61041 has
a 250-mA switch current limit, offering lower output
voltage ripple and allows the use of a smaller form
factor inductor for lower power applications. The low
quiescent current (typically 28 mA) together with an
optimized control scheme, allows device operation at
very high efficiencies over the entire load current
range.
TYPICAL APPLICATION
1
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.
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.
Copyright © 2002–2010, Texas Instruments Incorporated
+
+
-
RS Latch
Logic
S
R
Gate
Driver
_
Current Limit
Power MOSFET
N-Channel
R
SENSE
Soft
Start
6 µs Max
On Time
V
REF
= 1.233 V
Error Comparator
400 ns Min
Off Time
Under Voltage
Lockout
Bias Supply
VIN
FB
EN
GND
SW
TPS61040
TPS61041
SLVS413F –OCTOBER 2002–REVISED DECEMBER 2010
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.
www.ti.com
Table 1. ORDERING INFORMATION
SWITCH CURRENT PACKAGE
T
A
–40°C to
85°C
(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.
(2) The devices are available in tape and reel and in tubes. Add R suffix to the part number (e.g.,
TPS61040DRVR) to order quantities of 3000 parts in tape and reel or add suffix T (e.g.,
TPS61040DRVT) to order a tube with 250 pieces..
PART NUMBER
TPS61040DBV 400 SOT23-5 PHOI
TPS61040DDC 400 TSOT23-5 QXK
TPS61041DBV 250 SOT23-5 PHPI
TPS61040DRV 400 SON-6 2×2 CCL
TPS61041DRV 250 SON-6 2×2 CAW
(2)
LIMIT, mA MARKING
(1)
PACKAGE
FUNCTIONAL BLOCK DIAGRAM
2 Submit Documentation Feedback Copyright © 2002–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS61040 TPS61041
I
peak(typ)
+ I
LIM
)
V
IN
L
100 ns
I
peak(typ)
+ 400 mA )
V
IN
L
100 ns for the TPS61040
I
peak(typ)
+ 250 mA )
V
IN
L
100 ns for the TPS61041
TPS61040
TPS61041
www.ti.com
Table 2. Terminal Functions
TERMINAL
NAME DRV NO.
EN 4 3 I mode reducing the supply current to less than 1 mA. This pin should not be left floating and needs
FB 3 4 I
GND 2 1 – Ground
NC – 5 – No connection
SW 1 6 I
V
IN
DDC,
DBV NO.
5 2 I Supply voltage pin
I/O DESCRIPTION
This is the enable pin of the device. Pulling this pin to ground forces the device into shutdown
to be terminated.
This is the feedback pin of the device. Connect this pin to the external voltage divider to program
the desired output voltage.
Connect the inductor and the Schottky diode to this pin. This is the switch pin and is connected to
the drain of the internal power MOSFET.
DETAILED DESCRIPTION
OPERATION
The TPS61040/41 operates with an input voltage range of 1.8 V to 6 V and can generate output voltages up to
28 V. The device operates in a pulse-frequency-modulation (PFM) scheme with constant peak current control.
This control scheme maintains high efficiency over the entire load current range, and with a switching frequency
up to 1 MHz, the device enables the use of very small external components.
The converter monitors the output voltage, and as soon as the feedback voltage falls below the reference voltage
of typically 1.233 V, the internal switch turns on and the current ramps up. The switch turns off as soon as the
inductor current reaches the internally set peak current of typically 400 mA (TPS61040) or 250 mA (TPS61041).
See the Peak Current Control section for more information. The second criteria that turns off the switch is the
maximum on-time of 6 ms (typical). This is just to limit the maximum on-time of the converter to cover for extreme
conditions. As the switch is turned off the external Schottky diode is forward biased delivering the current to the
output. The switch remains off for a minimum of 400 ns (typical), or until the feedback voltage drops below the
reference voltage again. Using this PFM peak current control scheme the converter operates in discontinuous
conduction mode (DCM) where the switching frequency depends on the output current, which results in very high
efficiency over the entire load current range. This regulation scheme is inherently stable, allowing a wider
selection range for the inductor and output capacitor.
SLVS413F –OCTOBER 2002–REVISED DECEMBER 2010
PEAK CURRENT CONTROL
The internal switch turns on until the inductor current reaches the typical dc current limit (I
(TPS61040) or 250 mA (TPS61041). Due to the internal propagation delay of typical 100 ns, the actual current
exceeds the dc current limit threshold by a small amount. The typical peak current limit can be calculated:
The higher the input voltage and the lower the inductor value, the greater the peak.
By selecting the TPS61040 or TPS61041, it is possible to tailor the design to the specific application current limit
requirements. A lower current limit supports applications requiring lower output power and allows the use of an
inductor with a lower current rating and a smaller form factor. A lower current limit usually has a lower output
voltage ripple as well.
Copyright © 2002–2010, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Link(s): TPS61040 TPS61041
) of 400 mA
LIM
(1)
I
LIM
4
I
LIM
2
TPS61040
TPS61041
SLVS413F –OCTOBER 2002–REVISED DECEMBER 2010
SOFT START
All inductive step-up converters exhibit high inrush current during start-up if no special precaution is made. This
can cause voltage drops at the input rail during start up and may result in an unwanted or early system shut
down.
The TPS61040/41 limits this inrush current by increasing the current limit in two steps starting from for 256
cycles to for the next 256 cycles, and then full current limit (see Figure 14).
ENABLE
Pulling the enable (EN) to ground shuts down the device reducing the shutdown current to 1 mA (typical).
Because there is a conductive path from the input to the output through the inductor and Schottky diode, the
output voltage is equal to the input voltage during shutdown. The enable pin needs to be terminated and should
not be left floating. Using a small external transistor disconnects the input from the output during shutdown as
shown in Figure 18.
UNDERVOLTAGE LOCKOUT
An undervoltage lockout prevents misoperation of the device at input voltages below typical 1.5 V. When the
input voltage is below the undervoltage threshold, the main switch is turned off.
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THERMAL SHUTDOWN
An internal thermal shutdown is implemented and turns off the internal MOSFETs when the typical junction
temperature of 168°C is exceeded. The thermal shutdown has a hysteresis of typically 25°C. This data is based
on statistical means and is not tested during the regular mass production of the IC.
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature (unless otherwise noted)
Supply voltages on pin V
Voltages on pins EN, FB
Switch voltage on pin SW
Continuous power dissipation See Dissipation Rating Table
T
Operating junction temperature –40°C to 150°C
J
T
Storage temperature –65°C to 150°C
stg
(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.
(2)
IN
(2)
(2)
(1)
UNIT
–0.3 V to 7 V
–0.3 V to VIN+ 0.3 V
30 V
DISSIPATION RATING TABLE
PACKAGE R
DBV 250°C/W 357 mW 3.5 mW/°C 192 mW 140 mW
DDC, DRV 76°C/W 1300 mW 13 mW/°C 688 mW 500 mW
qJA
TA≤ 25°C FACTOR TA= 70°C TA= 85°C
POWER RATING ABOVE POWER RATING POWER RATING
DERATING
TA= 25°C
4 Submit Documentation Feedback Copyright © 2002–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS61040 TPS61041
TPS61040
TPS61041
www.ti.com
RECOMMENDED OPERATING CONDITIONS
V
V
L Inductor
f Switching frequency
C
C
T
T
(1) See application section for further information.
Input voltage range 1.8 6 V
IN
Output voltage range 28 V
OUT
IN
OUT
A
J
(1)
(1)
Input capacitor
Output capacitor
(1)
(1)
Operating ambient temperature –40 85 °C
Operating junction temperature –40 125 °C
ELECTRICAL CHARACTERISTICS
VIN= 2.4 V, EN = VIN, TA= –40°C to 85°C, typical values are at TA= 25°C (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY CURRENT
V
IN
I
Q
I
SD
V
UVLO
ENABLE
V
IH
V
IL
I
I
POWER SWITCH AND CURRENT LIMIT
Vsw Maximum switch voltage 30 V
t
off
t
on
R
DS(on)
R
DS(on)
I
LIM
I
LIM
OUTPUT
V
OUT
V
ref
I
FB
V
FB
(1) The line and load regulation depend on the external component selection. See the application section for further information.
Input voltage range 1.8 6 V
Operating quiescent current I
= 0 mA, not switching, VFB= 1.3 V 28 50 mA
OUT
Shutdown current EN = GND 0.1 1 mA
Under-voltage lockout threshold 1.5 1.7 V
EN high level input voltage 1.3 V
EN low level input voltage 0.4 V
EN input leakage current EN = GND or V
IN
Minimum off time 250 400 550 ns
Maximum on time 4 6 7.5 ms
MOSFET on-resistance VIN= 2.4 V; ISW= 200 mA; TPS61040 600 1000 mΩ
MOSFET on-resistance VIN= 2.4 V; ISW= 200 mA; TPS61041 750 1250 mΩ
MOSFET leakage current VSW= 28 V 1 10 mA
MOSFET current limit TPS61040 350 400 450 mA
MOSFET current limit TPS61041 215 250 285 mA
Adjustable output voltage range V
Internal voltage reference 1.233 V
Feedback input bias current VFB= 1.3 V 1 mA
Feedback trip point voltage 1.8 V ≤ VIN≤ 6 V 1.208 1.233 1.258 V
Line regulation
Load regulation
(1)
(1)
1.8 V ≤ VIN≤ 6 V; V
CFF= not connected
VIN= 2.4 V; V
= 18 V; 0 mA ≤ I
OUT
OUT
SLVS413F –OCTOBER 2002–REVISED DECEMBER 2010
MIN TYP MAX UNIT
2.2 10 mH
4.7 mF
1 mF
0.1 1 mA
IN
= 18 V; I
= 10 mA;
load
≤ 30 mA 0.15 %/mA
OUT
0.05 %/V
1 MHz
28 V
Copyright © 2002–2010, Texas Instruments Incorporated Submit Documentation Feedback 5
Product Folder Link(s): TPS61040 TPS61041
Efficiency − %
70
72
74
76
78
80
82
84
86
88
90
0.1 1 10 100
VI = 5 V
VI = 3.6 V
VI = 2.4 V
IO − Output Current − mA
VO = 18 V
70
72
74
76
78
80
82
84
86
88
90
0.1 1 10 100
TPS61040
TPS61041
IL − Load Current − mA
L = 10 µH
VO = 18 V
Efficiency − %
TPS61040
TPS61041
SLVS413F –OCTOBER 2002–REVISED DECEMBER 2010
TYPICAL CHARACTERISTICS
h Efficiency
I
Q
V
FB
I
SW
I
CL
R
DS(on)
Quiescent current vs Input voltage and temperature 5
Feedback voltage vs Temperature 6
Switch current limit vs Temperature 7
Switch current limit
R
DS(on)
Line transient response 12
Load transient response 13
Start-up behavior 14
EFFICIENCY EFFICIENCY
OUTPUT CURRENT LOAD CURRENT
vs Load current 1, 2, 3
vs Input voltage 4
vs Supply voltage, TPS61041 8
vs Supply voltage, TPS61040 9
vs Temperature 10
vs Supply voltage 11
vs vs
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Table 3. Table of Graphs
FIGURE
Figure 1. Figure 2.
6 Submit Documentation Feedback Copyright © 2002–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS61040 TPS61041
70
72
74
76
78
80
82
84
86
88
90
0.1 1 10
100
L = 10 µH
L = 3.3 µH
IL − Load Current − mA
VO = 18 V
Efficiency − %
70
72
74
76
78
80
82
84
86
88
90
1 2 3 4 5 6
IO = 10 mA
IO = 5 mA
VI − Input Voltage − V
L = 10 µH
VO = 18 V
Efficiency − %
1.23
1.232
1.234
1.236
1.238
1.24
−40 −20 0 20 40 60 80 100 120
VCC = 2.4 V
TA − Temperature − °C
V
FB
− Feedback Voltage − V
0
5
10
15
20
25
30
35
40
1.8 2.4 3 3.6 4.2 4.8 5.4 6
VI − Input Voltage − V
TA = 85°C
TA = 27°C
TA = −40°C
Quiescent Current − µA
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TPS61040
TPS61041
SLVS413F –OCTOBER 2002–REVISED DECEMBER 2010
EFFICIENCY EFFICIENCY
vs vs
LOAD CURRENT INPUT VOLTAGE
Figure 3. Figure 4.
TPS61040
QUIESCENT CURRENT FEEDBACK VOLTAGE
vs vs
INPUT VOLTAGE FREE-AIR TEMPERATURE
Copyright © 2002–2010, Texas Instruments Incorporated Submit Documentation Feedback 7
Figure 5. Figure 6.
Product Folder Link(s): TPS61040 TPS61041
230
250
270
290
310
330
350
370
390
410
430
−40−30−20 −10 0 10 20 30 40 50 60 70 80 90
TPS61040
TPS61041
TA − Temperature − °C
I
(SW)
− Switch Current Limit − mA
240
242
244
246
248
250
252
254
256
258
260
1.8 2.4 3 3.6 4.2 4.8 5.4 6
VCC − Supply Voltage − V
TA = 27°C
I
(CL)
− Current Limit − mA
0
200
400
600
800
1000
1200
−40−30 −20−10 0 10 20 30 40 50 60 70 80 90
TA − Temperature − °C
TPS61041
TPS61040
r
DS(on)
− Static Drain-Source On-State Resistance − mΩ
380
385
390
395
400
405
410
415
420
1.8 2.4 3 3.6 4.2 4.8 5.4 6
VCC − Supply Voltage − V
TA = 27°C
I
(CL)
− Current Limit − mA
TPS61040
TPS61041
SLVS413F –OCTOBER 2002–REVISED DECEMBER 2010
TPS61040/41 TPS61041
SWITCH CURRENT LIMIT CURRENT LIMIT
vs vs
FREE-AIR TEMPERATURE SUPPLY VOLTAGE
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Figure 7. Figure 8.
TPS61040 TPS61040/41
CURRENT LIMIT STATIC DRAIN-SOURCE ON-STATE RESISTANCE
vs vs
SUPPLY VOLTAGE FREE-AIR TEMPERATURE
8 Submit Documentation Feedback Copyright © 2002–2010, Texas Instruments Incorporated
Figure 9. Figure 10.
Product Folder Link(s): TPS61040 TPS61041
V
I
2.4 V to 3.4 V
V
O
100 mV/div
200 µS/div
VO = 18 V
0
100
200
300
400
500
600
700
800
900
1000
1.8 2.4 3 3.6 4.2 4.8 5.4 6
VCC − Supply Voltage − V
TPS61041
TPS61040
r
DS(on)
− Static Drain-Source On-State Resistance − mΩ
V
O
5 V/div
EN
1 V/div
I
I
50 mA/div
VO = 18 V
V
O
1 mA to 10 mA
200 µS/div
V
O
100 mA/div
VO = 18 V
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TPS61040
TPS61041
SLVS413F –OCTOBER 2002–REVISED DECEMBER 2010
TPS61040/41
STATIC DRAIN-SOURCE ON-STATE RESISTANCE
vs
SUPPLY VOLTAGE
Figure 11. Figure 12. Line Transient Response
Figure 13. Load Transient Response Figure 14. Start-Up Behavior
Copyright © 2002–2010, Texas Instruments Incorporated Submit Documentation Feedback 9
Product Folder Link(s): TPS61040 TPS61041
fS
max
+
V
IN(min)
(V
OUT
* V
IN)
IP L V
OUT
fSǒI
load
Ǔ
+
2 I
load
(V
OUT
* VIN) Vd)
I
2
P
L
I
load max
+ h
I
2
P
L fS
max
2 (V
OUT
* V
IN)
TPS61040
TPS61041
SLVS413F –OCTOBER 2002–REVISED DECEMBER 2010
APPLICATION INFORMATION
INDUCTOR SELECTION, MAXIMUM LOAD CURRENT
Because the PFM peak current control scheme is inherently stable, the inductor value does not affect the stability
of the regulator. The selection of the inductor together with the nominal load current, input and output voltage of
the application determines the switching frequency of the converter. Depending on the application, inductor
values between 2.2 mH and 47 mH are recommended. The maximum inductor value is determined by the
maximum on time of the switch, typically 6 ms. The peak current limit of 400 mA/250 mA (typically) should be
reached within this 6-ms period for proper operation.
The inductor value determines the maximum switching frequency of the converter. Therefore, select the inductor
value that ensures the maximum switching frequency at the converter maximum load current is not exceeded.
The maximum switching frequency is calculated by the following formula:
Where:
IP= Peak current as described in the Peak Current Control section
L = Selected inductor value
V
If the selected inductor value does not exceed the maximum switching frequency of the converter, the next step
is to calculate the switching frequency at the nominal load current using the following formula:
= The highest switching frequency occurs at the minimum input voltage (2)
IN(min)
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Where:
IP= Peak current as described in the Peak Current Control section
L = Selected inductor value
I
= Nominal load current
load
Vd = Rectifier diode forward voltage (typically 0.3V) (3)
A smaller inductor value gives a higher converter switching frequency, but lowers the efficiency.
The inductor value has less effect on the maximum available load current and is only of secondary order. The
best way to calculate the maximum available load current under certain operating conditions is to estimate the
expected converter efficiency at the maximum load current. This number can be taken out of the efficiency
graphs shown in Figure 1 through Figure 4. The maximum load current can then be estimated as follows:
Where:
IP= Peak current as described in the Peak Current Control section
L = Selected inductor value
fS
= Maximum switching frequency as calculated previously
max
h = Expected converter efficiency. Typically 70% to 85% (4)
10 Submit Documentation Feedback Copyright © 2002–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS61040 TPS61041
V
OUT
+ 1.233 V ǒ1 )
R1
R2
Ǔ
C
FF
+
1
2 p
fS
20
R1
TPS61040
TPS61041
www.ti.com
The maximum load current of the converter is the current at the operation point where the converter starts to
enter the continuous conduction mode. Usually the converter should always operate in discontinuous conduction
mode.
Last, the selected inductor should have a saturation current that meets the maximum peak current of the
converter (as calculated in the Peak Current Control section). Use the maximum value for I
Another important inductor parameter is the dc resistance. The lower the dc resistance, the higher the efficiency
of the converter. See Table 4 and the typical applications for the inductor selection.
Table 4. Recommended Inductor for Typical LCD Bias Supply (see Figure 15)
DEVICE INDUCTOR VALUE COMPONENT SUPPLIER COMMENTS
10 mH Sumida CR32-100 High efficiency
10 mH Sumida CDRH3D16-100 High efficiency
TPS61040 10 mH Murata LQH4C100K04 High efficiency
4.7 mH Sumida CDRH3D16-4R7 Small solution size
4.7 mH Murata LQH3C4R7M24 Small solution size
TPS61041 10 mH Murata LQH3C100K24
SETTING THE OUTPUT VOLTAGE
The output voltage is calculated as:
SLVS413F –OCTOBER 2002–REVISED DECEMBER 2010
for this calculation.
LIM
High efficiency
Small solution size
(5)
For battery-powered applications, a high-impedance voltage divider should be used with a typical value for R2 of
≤200 kΩ and a maximum value for R1 of 2.2 MΩ. Smaller values might be used to reduce the noise sensitivity of
the feedback pin.
A feedforward capacitor across the upper feedback resistor R1 is required to provide sufficient overdrive for the
error comparator. Without a feedforward capacitor, or one whose value is too small, the TPS61040/41 shows
double pulses or a pulse burst instead of single pulses at the switch node (SW), causing higher output voltage
ripple. If this higher output voltage ripple is acceptable, the feedforward capacitor can be left out.
The lower the switching frequency of the converter, the larger the feedforward capacitor value required. A good
starting point is to use a 10-pF feedforward capacitor. As a first estimation, the required value for the feedforward
capacitor at the operation point can also be calculated using the following formula:
Where:
R1 = Upper resistor of voltage divider
fS = Switching frequency of the converter at the nominal load current (See the Inductor Selection, Maximum
Load Current section for calculating the switching frequency)
CFF= Choose a value that comes closest to the result of the calculation (6)
Copyright © 2002–2010, Texas Instruments Incorporated Submit Documentation Feedback 11
Product Folder Link(s): TPS61040 TPS61041
DV
out
+
I
out
C
out
ǒ
1
fS(Iout)
–
IP L
Vout ) Vd–Vin
Ǔ
) IP ESR
TPS61040
TPS61041
SLVS413F –OCTOBER 2002–REVISED DECEMBER 2010
The larger the feedforward capacitor the worse the line regulation of the device. Therefore, when concern for line
regulation is paramount, the selected feedforward capacitor should be as small as possible. See the following
section for more information about line and load regulation.
LINE AND LOAD REGULATION
The line regulation of the TPS61040/41 depends on the voltage ripple on the feedback pin. Usually a 50 mV
peak-to-peak voltage ripple on the feedback pin FB gives good results.
Some applications require a very tight line regulation and can only allow a small change in output voltage over a
certain input voltage range. If no feedforward capacitor CFFis used across the upper resistor of the voltage
feedback divider, the device has the best line regulation. Without the feedforward capacitor the output voltage
ripple is higher because the TPS61040/41 shows output voltage bursts instead of single pulses on the switch pin
(SW), increasing the output voltage ripple. Increasing the output capacitor value reduces the output voltage
ripple.
If a larger output capacitor value is not an option, a feedforward capacitor CFFcan be used as described in the
previous section. The use of a feedforward capacitor increases the amount of voltage ripple present on the
feedback pin (FB). The greater the voltage ripple on the feedback pin (≥50 mV), the worse the line regulation.
There are two ways to improve the line regulation further:
1. Use a smaller inductor value to increase the switching frequency which will lower the output voltage ripple,
as well as the voltage ripple on the feedback pin.
2. Add a small capacitor from the feedback pin (FB) to ground to reduce the voltage ripple on the feedback pin
down to 50 mV again. As a starting point, the same capacitor value as selected for the feedforward capacitor
CFFcan be used.
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OUTPUT CAPACITOR SELECTION
For best output voltage filtering, a low ESR output capacitor is recommended. Ceramic capacitors have a low
ESR value but tantalum capacitors can be used as well, depending on the application.
Assuming the converter does not show double pulses or pulse bursts on the switch node (SW), the output
voltage ripple can be calculated as:
where:
IP= Peak current as described in the Peak Current Control section
L = Selected inductor value
I
= Nominal load current
out
fS (I
) = Switching frequency at the nominal load current as calculated previously
out
Vd = Rectifier diode forward voltage (typically 0.3 V)
C
= Selected output capacitor
out
ESR = Output capacitor ESR value (7)
See Table 5 and the typical applications section for choosing the output capacitor.
Table 5. Recommended Input and Output Capacitors
DEVICE CAPACITOR VOLTAGE RATING COMPONENT SUPPLIER COMMENTS
4.7 mF/X5R/0805 6.3 V Tayo Yuden JMK212BY475MG CIN/C
10 mF/X5R/0805 6.3 V Tayo Yuden JMK212BJ106MG CIN/C
TPS61040/41 1 mF/X7R/1206 25 V Tayo Yuden TMK316BJ105KL C
1 mF/X5R/1206 35 V Tayo Yuden GMK316BJ105KL C
4.7 mF/X5R/1210 25 V Tayo Yuden TMK325BJ475MG C
OUT
OUT
OUT
OUT
OUT
12 Submit Documentation Feedback Copyright © 2002–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS61040 TPS61041
V
IN
SW
FB
EN
GND
L1
D1
R1
R2
C
FF
C
O
V
O
V
IN
C
IN
TPS61040
TPS61041
www.ti.com
INPUT CAPACITOR SELECTION
For good input voltage filtering, low ESR ceramic capacitors are recommended. A 4.7 mF ceramic input capacitor
is sufficient for most of the applications. For better input voltage filtering this value can be increased. See Table 5
and typical applications for input capacitor recommendations.
DIODE SELECTION
To achieve high efficiency a Schottky diode should be used. The current rating of the diode should meet the
peak current rating of the converter as it is calculated in the Peak Current Control section. Use the maximum
value for I
for this calculation. See Table 6 and the typical applications for the selection of the Schottky diode.
LIM
Table 6. Recommended Schottky Diode for Typical LCD Bias Supply (see Figure 15)
DEVICE REVERSE VOLTAGE COMPONENT SUPPLIER COMMENTS
30 V ON Semiconductor MBR0530
TPS61040/41
20 V ON Semiconductor MBR0520
20 V ON Semiconductor MBRM120L High efficiency
30 V Toshiba CRS02
LAYOUT CONSIDERATIONS
Typical for all switching power supplies, the layout is an important step in the design; especially at high peak
currents and switching frequencies. If the layout is not carefully done, the regulator might show noise problems
and duty cycle jitter.
The input capacitor should be placed as close as possible to the input pin for good input voltage filtering. The
inductor and diode should be placed as close as possible to the switch pin to minimize the noise coupling into
other circuits. Because the feedback pin and network is a high-impedance circuit, the feedback network should
be routed away from the inductor. The feedback pin and feedback network should be shielded with a ground
plane or trace to minimize noise coupling into this circuit.
Wide traces should be used for connections in bold as shown in Figure 15. A star ground connection or ground
plane minimizes ground shifts and noise.
SLVS413F –OCTOBER 2002–REVISED DECEMBER 2010
Copyright © 2002–2010, Texas Instruments Incorporated Submit Documentation Feedback 13
Figure 15. Layout Diagram
Product Folder Link(s): TPS61040 TPS61041
V
IN
SW
FB
EN
GND
L1
10 µH
D1
R1
2.2 MW
R2
160 kW
C
FF
22 pF
C2
1 µF
V
OUT
18 V
V
IN
1.8 V to 6 V
C1
4.7 µF
L1: Sumida CR32-100
D1: Motorola MBR0530
C1: Tayo Yuden JMK212BY475MG
C2: Tayo Yuden TMK316BJ105KL
TPS61040
V
IN
SW
FB
EN
GND
L1
10 µH
D1
R1
2.2 MW
R2
160 kW
C
FF
22 pF
C2
1 µF
V
O
18 V
VIN
1.8 V to 6 V
C1
4.7 µF
DAC or Analog Voltage
0 V = 25 V
1.233 V = 18 V
TPS61040
L1: Sumida CR32-100
D1: Motorola MBR0530
C1: Tayo Yuden JMK212BY475MG
C2: Tayo Yuden GMK316BJ105KL
V
IN
SW
FB
EN
GND
L1
10 µH
D1
R1
2.2 MW
R2
160 kW
C
FF
22 pF
C2
1 µF
V
OUT
18 V / 10 mA
V
IN
1.8 V to 6 V
C1
4.7 µF
R3
200 kW
BC857C
C3
0.1 µF
(Optional)
L1: Sumida CR32-100
D1: Motorola MBR0530
C1: Tayo Yuden JMK212BY475MG
C2: Tayo Yuden TMK316BJ105KL
TPS61040
TPS61040
TPS61041
SLVS413F –OCTOBER 2002–REVISED DECEMBER 2010
www.ti.com
Figure 16. LCD Bias Supply
Figure 17. LCD Bias Supply With Adjustable Output Voltage
Figure 18. LCD Bias Supply With Load Disconnect
14 Submit Documentation Feedback Copyright © 2002–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS61040 TPS61041
V
IN
SW
FB
EN
GND
L1
6.8 µH
D1
R1
1.5 MW
R2
210 kW
C
FF
22 pF
C2
1 µF
V1 = 10 V/15 mA
VIN = 2.7 V to 5 V
C1
4.7 µF
C4
4.7 µF
C3
1 µF
V2 = –10 V/15 mA
D2
D3
L1: Murata LQH4C6R8M04
D1, D2, D3: Motorola MBR0530
C1: Tayo Yuden JMK212BY475MG
C2, C3, C4: Tayo Yuden EMK316BJ105KF
TPS61040
V
IN
SW
FB
EN
GND
L1
6.8 µH
D1
R1
1.8 MW
R2
205 kW
C
FF
4.7 pF
C2
4.7 µF
V
O =
12 V/35 mA
VIN 3.3 V
C1
10 µF
L1: Murata LQH4C6R8M04
D1: Motorola MBR0530
C1: Tayo Yuden JMK212BJ106MG
C2: Tayo Yuden EMK316BJ475ML
TPS61040
V
IN
SW
FB
EN
GND
3.3 µH
D1
C2
4.7 µF
5 V/45 mA
1.8 V to 4 V
C1
4.7 µF
TPS61040
L1: Murata LQH4C3R3M04
D1: Motorola MBR0530
C1, C2: Tayo Yuden JMK212BY475MG
C
FF
3.3 pF
R1
620 kW
R2
200 kW
www.ti.com
TPS61040
TPS61041
SLVS413F –OCTOBER 2002–REVISED DECEMBER 2010
Figure 19. Positive and Negative Output LCD Bias Supply
Copyright © 2002–2010, Texas Instruments Incorporated Submit Documentation Feedback 15
Figure 21. Dual Battery Cell to 5-V/50-mA Conversion
Efficiency Approx. Equals 84% at VIN= 2.4 V to Vo = 5 V/45 mA
Figure 20. Standard 3.3-V to 12-V Supply
Product Folder Link(s): TPS61040 TPS61041
V
IN
SW
FB
EN
GND
L1
10 µH
D1
C2
1 µF
C1
4.7 µF
R
S
82 Ω
VCC = 2.7 V to 6 V
PWM
100 Hz to 500 Hz
D2
24 V
(Optional)
L1: Murata LQH4C100K04
D1: Motorola MBR0530
C1: Tayo Yuden JMK212BY475MG
C2: Tayo Yuden TMK316BJ105KL
V
IN
SW
FB
EN
GND
L1
10 µH
D1
MBRM120L
C2
100 nF
(See
Note A)
C1
4.7 µF
R
S
110 Ω
VCC = 2.7 V to 6 V
R1
120 kΩ
R2
160 kΩ
Analog Brightness Control
3.3 V ≅ Led Off
0 V ≅ Iled = 20 mA
D2
24 V
(Optional)
L1: Murata LQH4C3R3M04
D1: Motorola MBR0530
C1: Tayo Yuden JMK212BY475MG
C2: Standard Ceramic Capacitor
TPS61040
TPS61041
SLVS413F –OCTOBER 2002–REVISED DECEMBER 2010
Figure 22. White LED Supply With Adjustable Brightness Control
Using a PWM Signal on the Enable Pin, Efficiency Approx. Equals 86% at VIN= 3 V, I
LED
www.ti.com
= 15 mA
A. A smaller output capacitor value for C2 causes a larger LED ripple.
Figure 23. White LED Supply With Adjustable Brightness Control
Using an Analog Signal on the Feedback Pin
16 Submit Documentation Feedback Copyright © 2002–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS61040 TPS61041
PACKAGE OPTION ADDENDUM
www.ti.com
17-May-2014
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status
(1)
Package Type Package
Drawing
Pins Package
Qty
Eco Plan
(2)
Lead/Ball Finish
(6)
MSL Peak Temp
(3)
Op Temp (°C) Device Marking
(4/5)
Samples
TPS61040DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS
& no Sb/Br)
CU NIPDAU Level-1-260C-UNLIM -40 to 85 PHOI
TPS61040DBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS
& no Sb/Br)
CU NIPDAU Level-1-260C-UNLIM -40 to 85 PHOI
TPS61040DDCR ACTIVE SOT DDC 5 3000 Green (RoHS
& no Sb/Br)
CU NIPDAU Level-2-260C-1 YEAR -40 to 85 QXK
TPS61040DDCT ACTIVE SOT DDC 5 250 Green (RoHS
& no Sb/Br)
CU NIPDAU Level-2-260C-1 YEAR -40 to 85 QXK
TPS61040DRVR ACTIVE SON DRV 6 3000 Green (RoHS
& no Sb/Br)
CU NIPDAU Level-1-260C-UNLIM -40 to 85 CCL
TPS61040DRVRG4 ACTIVE SON DRV 6 TBD Call TI Call TI -40 to 85
TPS61040DRVT ACTIVE SON DRV 6 250 Green (RoHS
& no Sb/Br)
CU NIPDAU Level-1-260C-UNLIM -40 to 85 CCL
TPS61040DRVTG4 ACTIVE SON DRV 6 250 Green (RoHS
& no Sb/Br)
CU NIPDAU Level-1-260C-UNLIM -40 to 85 CCL
TPS61041DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS
& no Sb/Br)
CU NIPDAU Level-1-260C-UNLIM -40 to 85 PHPI
TPS61041DBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS
& no Sb/Br)
CU NIPDAU Level-1-260C-UNLIM -40 to 85 PHPI
TPS61041DRVR ACTIVE SON DRV 6 3000 Green (RoHS
& no Sb/Br)
CU NIPDAU Level-1-260C-UNLIM -40 to 85 CAW
TPS61041DRVRG4 ACTIVE SON DRV 6 3000 Green (RoHS
& no Sb/Br)
CU NIPDAU Level-1-260C-UNLIM -40 to 85 CAW
TPS61041DRVT ACTIVE SON DRV 6 250 Green (RoHS
& no Sb/Br)
CU NIPDAU Level-1-260C-UNLIM -40 to 85 CAW
TPS61041DRVTG4 ACTIVE SON DRV 6 250 Green (RoHS
& no Sb/Br)
CU NIPDAU Level-1-260C-UNLIM -40 to 85 CAW
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
PACKAGE OPTION ADDENDUM
www.ti.com
17-May-2014
Addendum-Page 2
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3)
MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4)
There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5)
Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6)
Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish
value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
OTHER QUALIFIED VERSIONS OF TPS61040, TPS61041 :
•
Automotive: TPS61040-Q1, TPS61041-Q1
NOTE: Qualified Version Definitions:
•
Automotive - Q100 devices qualified for high-reliability automotive applications targeting zero defects
PACKAGE MATERIALS INFORMATION
www.ti.com 28-Nov-2013
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
TPS61040DBVR SOT-23 DBV 5 3000 178.0 9.0 3.23 3.17 1.37 4.0 8.0 Q3
TPS61040DBVR SOT-23 DBV 5 3000 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
TPS61040DDCR SOT DDC 5 3000 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
TPS61040DDCT SOT DDC 5 250 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
TPS61040DRVR SON DRV 6 3000 179.0 8.4 2.2 2.2 1.2 4.0 8.0 Q2
TPS61040DRVT SON DRV 6 250 179.0 8.4 2.2 2.2 1.2 4.0 8.0 Q2
TPS61041DBVR SOT-23 DBV 5 3000 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
TPS61041DBVR SOT-23 DBV 5 3000 178.0 9.0 3.23 3.17 1.37 4.0 8.0 Q3
TPS61041DRVR SON DRV 6 3000 179.0 8.4 2.2 2.2 1.2 4.0 8.0 Q2
TPS61041DRVR SON DRV 6 3000 180.0 8.4 2.25 2.25 1.0 4.0 8.0 Q2
TPS61041DRVT SON DRV 6 250 180.0 8.4 2.25 2.25 1.0 4.0 8.0 Q2
Type
Package
Drawing
Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm)B0(mm)K0(mm)P1(mm)W(mm)
Pin1
Quadrant
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com 28-Nov-2013
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
TPS61040DBVR SOT-23 DBV 5 3000 180.0 180.0 18.0
TPS61040DBVR SOT-23 DBV 5 3000 203.0 203.0 35.0
TPS61040DDCR SOT DDC 5 3000 195.0 200.0 45.0
TPS61040DDCT SOT DDC 5 250 195.0 200.0 45.0
TPS61040DRVR SON DRV 6 3000 203.0 203.0 35.0
TPS61040DRVT SON DRV 6 250 203.0 203.0 35.0
TPS61041DBVR SOT-23 DBV 5 3000 203.0 203.0 35.0
TPS61041DBVR SOT-23 DBV 5 3000 180.0 180.0 18.0
TPS61041DRVR SON DRV 6 3000 203.0 203.0 35.0
TPS61041DRVR SON DRV 6 3000 205.0 200.0 33.0
TPS61041DRVT SON DRV 6 250 205.0 200.0 33.0
Pack Materials-Page 2
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