TPS61032RSAR [TI]
96% EFFICIENT SYNCHRONOUS BOOST CONVERTER WITH 4A SWITCH;
| 型号： | TPS61032RSAR |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 96% EFFICIENT SYNCHRONOUS BOOST CONVERTER WITH 4A SWITCH |
| 文件： | 总28页 (文件大小：878K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TPS61030
TPS61031, TPS61032
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www.ti.com
SLUS534D–SEPTEMBER 2002–REVISED APRIL 2004
96% EFFICIENT SYNCHRONOUS BOOST CONVERTER WITH 4A SWITCH
FEATURES
DESCRIPTION
•
96% Efficient Synchronous Boost Converter
With 1000-mA Output Current From 1.8-V
Input
The TPS6103x devices provide a power supply
solution for products powered by either a one-cell
Li-Ion or Li-polymer, or a two to three-cell alkaline,
NiCd or NiMH battery. The converter generates a
stable output voltage that is either adjusted by an
external resistor divider or fixed internally on the chip.
It provides high efficient power conversion and is
capable of delivering output currents up to 1 A at 5 V
at a supply voltage down to 1.8 V. The implemented
boost converter is based on a fixed frequency,
pulse-width- modulation (PWM) controller using a
synchronous rectifier to obtain maximum efficiency.
At low load currents the converter enters Power Save
mode to maintain a high efficiency over a wide load
current range. The Power Save mode can be dis-
abled, forcing the converter to operate at a fixed
switching frequency. It can also operate synchronized
to an external clock signal that is applied to the
SYNC pin. The maximum peak current in the boost
switch is limited to a value of 4500 mA.
•
•
•
Device Quiescent Current: 20-µA (Typ)
Input Voltage Range: 1.8-V to 5.5-V
Fixed and Adjustable Output Voltage Options
Up to 5.5-V
•
Power Save Mode for Improved Efficiency at
Low Output Power
•
•
Low Battery Comparator
Low EMI-Converter (Integrated Antiringing
Switch)
•
•
•
Load Disconnect During Shutdown
Over-Temperature Protection
Available in a Small 4 mm x 4 mm QFN-16 or
in a TSSOP-16 Package
APPLICATIONS
The converter can be disabled to minimize battery
drain. During shutdown, the load is completely dis-
connected from the battery. A low-EMI mode is
implemented to reduce ringing and, in effect, lower
radiated electromagnetic energy when the converter
enters the discontinuous conduction mode.
•
All Single Cell Li or Dual Cell Battery
Operated Products as MP-3 Player, PDAs, and
Other Portable Equipment
The device is packaged in a 16-pin QFN package
measuring 4 mm x 4 mm (RSA) or in a 16-pin
TSSOP PowerPAD™ package (PWP).
L1
e.g. 5 V up to
1000 mA
VOUT
SW
6.8 µH
C2
2.2 µF
C3
220 µF
VBAT
R3
R4
R1
R2
1.8 V to 5 V
Input
C1
10 µF
EN
FB
R6
LBI
SYNC
GND
LBO
Low Battery
Comparator
Output
PGND
TPS6103x
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.
PowerPAD is a trademark of Texas Instruments.
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 © 2002–2004, Texas Instruments Incorporated
TPS61030
TPS61031, TPS61032
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SLUS534D–SEPTEMBER 2002–REVISED APRIL 2004
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.
AVAILABLE OUTPUT VOLTAGE OPTIONS(1)
OUTPUT VOLTAGE
TA
PACKAGE
PART NUMBER(2)
DC/DC
Adjustable
3.3 V
TPS61030PWP
TPS61031PWP
TPS61032PWP
TPS61030RSA
TPS61031RSA
TPS61032RSA
16-Pin TSSOP PowerPAD™
5 V
40°C to 85°C
Adjustable
3.3 V
16-Pin QFN
5 V
(1) Contact the factory to check availability of other fixed output voltage versions.
(2) The packages are available taped and reeled. Add R suffix to device type (e.g., TPS61030PWPR or TPS61030RSAR) to order
quantities of 2000 devices per reel for the PWP packaged devices and 3000 units per reel for the RSA package.
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted)(1)
TPS6103x
Input voltage range on LBI
-0.3 V to 3.6 V
-0.3 V to 7 V
Input voltage range on SW, VOUT, LBO, VBAT, SYNC, EN, FB
Maximum junction temperature TJ
-40°C to 150°C
-65°C to 150°C
Storage temperature range Tstg
(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.
RECOMMENDED OPERATING CONDITIONS
MIN
1.8
-40
-40
NOM
MAX
5.5
UNIT
V
Supply voltage at VBAT, VI
Operating ambient temperature range, TA
Operating virtual junction temperaturerange, TJ
85
°C
125
°C
2
TPS61030
TPS61031, TPS61032
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SLUS534D–SEPTEMBER 2002–REVISED APRIL 2004
ELECTRICAL CHARACTERISTICS
over recommended free-air temperature range and over recommended input voltage range (typical at an ambient temperature
range of 25°C) (unless otherwise noted)
DC/DC STAGE
PARAMETER
TEST CONDITIONS
MIN
1.8
TYP
MAX
5.5
UNIT
V
VI
Input voltage range
VO
VFB
f
TPS61030 output voltage range
TPS61030 feedback voltage
Oscillator frequency
1.8
5.5
V
490
500
500
3600
500
600
510
700
700
4500
mV
kHz
kHz
mA
mA
mΩ
mΩ
Frequency range for synchronization
Switch current limit
VOUT= 5 V
4000
0.4 x ISW
55
Start-up current limit
SWN switch on resistance
SWP switch on resistance
Total accuracy
VOUT= 5 V
VOUT= 5 V
55
-3%
3%
0.6%
0.6%
Line regulation
Load regulation
IO = 0 mA, VEN = VBAT = 1.8 V,
VOUT =5 V
VBAT
VOUT
10
25
µA
Quiescent current
Shutdown current
IO = 0 mA, VEN = VBAT = 1.8 V,
VOUT = 5 V
10
20
1
µA
µA
VEN= 0 V, VBAT = 2.4 V
0.1
CONTROL STAGE
PARAMETER
TEST CONDITIONS
VLBI voltage decreasing
VLBI voltage decreasing
MIN
TYP
1.5
MAX
UNIT
V
VUVLO Under voltage lockout threshold
VIL
LBI voltage threshold
490
500
10
510
mV
mV
µA
V
LBI input hysteresis
LBI input current
EN = VBAT or GND
0.01
0.04
100
0.01
0.1
0.4
LBO output low voltage
LBO output low current
LBO output leakage current
EN, SYNC input low voltage
EN, SYNC input high voltage
EN, SYNC input current
Overtemperature protection
Overtemperature hysteresis
VO = 3.3 V, IOI = 100 µA
µA
µA
V
VLBO= 7 V
0.1
VIL
VIH
0.2 × VBAT
0.8 × VBAT
V
Clamped on GND or VBAT
0.01
140
20
0.1
µA
°C
°C
3
TPS61030
TPS61031, TPS61032
www.ti.com
SLUS534D–SEPTEMBER 2002–REVISED APRIL 2004
PIN ASSIGNMENTS
PWP PACKAGE
(TOP VIEW)
RSA PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
SW
SW
NC
VOUT
VOUT
VOUT
FB
GND
LBO
EN
PGND
PGND
PGND
VBAT
LBI
VOUT
NC
LBO
EN
SYNC
LBI
PowerPAD
SW
SW
SYNC
NC − No internal connection
Terminal Functions
TERMINAL
NAME
NO.
I/O
DESCRIPTION
PWP
RSA
11
14
13
9
EN
FB
9
I
I
Enable input. (1/VBAT enabled, 0/GND disabled)
Voltage feedback of adjustable versions
Control/logic ground
12
11
7
GND
LBI
I/O
I
Low battery comparator input (comparator enabled with EN)
Low battery comparator output (open drain)
Not connected
LBO
NC
10
16
8
12
2
O
SYNC
10
I
Enable/disable power save mode (1/VBAT disabled, 0/GND enabled,
clock signal for synchronization)
SW
PGND
1, 2
3, 4
5, 6, 7
8
I
I/O
I
Boost and rectifying switch input
Power ground
3, 4, 5
6
VBAT
Supply voltage
VOUT
13, 14, 15
1, 15, 16
O
DC/DC output
PowerPAD™
Must be soldered to achieve appropriate power dissipation. Should be
connected to PGND.
4
TPS61030
TPS61031, TPS61032
www.ti.com
SLUS534D–SEPTEMBER 2002–REVISED APRIL 2004
FUNCTIONAL BLOCK DIAGRAM
SW
VOUT
PGND
Anti-
Ringing
VBAT
PGND
Gate
Control
100 kW
PGND
10 pF
Error Amplifier
_
+
FB
Regulator
+
_
V
REF
= 0.5 V
Control Logic
Oscillator
GND
Temperature
Control
EN
SYNC
GND
LBI
Low Battery Comparator
+
_
LBO
+
V
REF
= 0.5 V
_
GND
PARAMETER MEASUREMENT INFORMATION
L1
VOUT
SW
V
CC
6.8 µH
Boost Output
C2
2.2 µF
C3
220 µF
VBAT
R3
R4
R1
R2
C1
10 µF
Power
Supply
EN
FB
R6
LBI
SYNC
GND
LBO
Control Output
PGND
List of Components:
U1 = TPS6103xPWP
TPS6103x
L1 = Sumida CDRH124–6R8
C1, C2 = X7R/X5R Ceramic
C3 = Low ESR Tantalum
5
TPS61030
TPS61031, TPS61032
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SLUS534D–SEPTEMBER 2002–REVISED APRIL 2004
TYPICAL CHARACTERISTICS
Table of Graphs
DC/DC Converter
Figure
1, 2
3
Maximum output current
vs Input voltage
vs Output current (TPS61030) (VO = 2.5 V, VI = 1.8 V, VSYNC = 0 V)
vs Output current (TPS61031) (VO = 3.3 V, VI = 1.8 V, 2.4 V, VSYNC = 0 V)
vs Output current (TPS61032) (VO = 5.0 V, VI = 2.4 V, 3.3 V, VSYNC = 0 V)
vs Input voltage (TPS61031) (IO = 10 mA, 100 mA, 1000 mA, VSYNC = 0 V)
vs Input voltage (TPS61032) (IO = 10 mA, 100 mA, 1000 mA, VSYNC = 0 V)
vs Output current (TPS61031) (VI = 2.4 V)
4
Efficiency
5
6
7
8
Output voltage
vs Output current (TPS61032) (VI = 3.3 V)
9
No-load supply current into VBAT
No-load supply current into VOUT
vs Input voltage (TPS61032)
10
11
12
13
14
15
16
17
vs Input voltage (TPS61032)
Minimum Load Resistance at Startup vs Input voltage (TPS61032)
Output voltage in continuous mode (TPS61032)
Output voltage in power save mode (TPS61032)
Load transient response (TPS61032)
Waveforms
Line transient response (TPS61032)
DC/DC converter start-up after enable (TPS61032)
TPS61031
TPS61032
MAXIMUM OUTPUT CURRENT
vs
MAXIMUM OUTPUT CURRENT
vs
INPUT VOLTAGE
INPUT VOLTAGE
3.5
3.5
3
3
2.5
2.5
2
1.5
1
2
1.5
1
0.5
0
0.5
0
1.8
2.2
2.6
3
3.4
3.8
4.2
4.6
5
1.8
2.2
2.6
3
3.4
3.8
4.2
4.6
5
V
- Input Voltage - V
V
- Input Voltage - V
I
I
Figure 1.
Figure 2.
6
TPS61030
TPS61031, TPS61032
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SLUS534D–SEPTEMBER 2002–REVISED APRIL 2004
TYPICAL CHARACTERISTICS (continued)
TPS61030
EFFICIENCY
vs
TPS61031
EFFICIENCY
vs
OUTPUT CURRENT
OUTPUT CURRENT
100
90
80
70
60
50
40
30
100
90
80
70
60
50
40
30
20
V
= 1.8 V
BAT
V
BAT
= 2.4 V
20
10
0
V
= 2.5 V
O
10
0
V
O
= 3.3 V
V = 1.8 V
I
1
10
100
1000
10000
1
10
100
1000
10000
I - Output Current - mA
O
I
O
- Output Current - mA
Figure 3.
Figure 4.
TPS61032
EFFICIENCY
vs
TPS61031
EFFICIENCY
vs
OUTPUT CURRENT
INPUT VOLTAGE
100
90
100
90
I
O
= 100 mA
V
BAT
= 2.4 V
I
O
= 1000 mA
80
70
V
BAT
= 3.3 V
I
O
= 10 mA
60
50
40
80
70
30
20
60
50
V
= 5 V
10
0
O
1
10
I
100
1000
10000
1.8
2
2.2
2.4
2.6
2.8
3
3.2
- Output Current - mA
O
V - Input Voltage - V
I
Figure 5.
Figure 6.
7
TPS61030
TPS61031, TPS61032
www.ti.com
SLUS534D–SEPTEMBER 2002–REVISED APRIL 2004
TYPICAL CHARACTERISTICS (continued)
TPS61032
EFFICIENCY
vs
TPS61031
OUTPUT VOLTAGE
vs
INPUT VOLTAGE
OUTPUT CURRENT
3.4
3.35
3.3
100
I
= 100 mA
O
95
90
85
80
75
70
65
60
I
O
= 10 mA
I
= 1000 mA
O
VBAT = 2.4 V
3.25
3.2
55
50
1.8
2.2
2.6
3
3.4
3.8
4.2
4.6
5
1
10
I
100
1000
10000
- Output Current - mA
V - Input Voltage - V
I
O
Figure 7.
Figure 8.
TPS61032
OUTPUT VOLTAGE
vs
TPS61032
NO-LOAD SUPPLY CURRENT INTO VBAT
vs
OUTPUT CURRENT
INPUT VOLTAGE
5.2
16
14
12
10
8
85°C
25°C
-40°C
5.15
5.1
5.05
VBAT = 3.3 V
5
4.95
6
4
4.9
4.85
4.8
2
0
2
3
4
5
1
10
100
1000
10000
V - Input Voltage - V
I
I
O
- Output Current - mA
Figure 9.
Figure 10.
8
TPS61030
TPS61031, TPS61032
www.ti.com
SLUS534D–SEPTEMBER 2002–REVISED APRIL 2004
TYPICAL CHARACTERISTICS (continued)
TPS61032
NO-LOAD SUPPLY CURRENT INTO VOUT
MINIMUM LOAD RESISTANCE AT START-UP
vs
vs
INPUT VOLTAGE
INPUT VOLTAGE
14
14
12
10
85°C
12
25°C
-40°C
10
8
6
4
8
6
4
2
0
2
0
2
3
4
5
1.8
2.2
2.6
3
3.4
3.8
4.2
4.6
5
V - Input Voltage - V
I
V
- Input Voltage - V
I
Figure 11.
Figure 12.
TPS61032
TPS61032
OUTPUT VOLTAGE IN CONTINUOUS MODE
OUTPUT VOLTAGE IN POWER SAVE MODE
Output Voltage
20 mV/Div
V = 3.3 V, R = 5 W
V = 3.3 V, R = 100 W
I
L
I
L
Output Voltage
50 mV/Div, AC
Inductor Current
200 mA/Div
Inductor Current
200 mA/Div, DC
Timebase - 1 µs/Div
Timebase - 200 µs/Div
Figure 14.
Figure 13.
9
TPS61030
TPS61031, TPS61032
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SLUS534D–SEPTEMBER 2002–REVISED APRIL 2004
TYPICAL CHARACTERISTICS (continued)
TPS61032
LOAD TRANSIENT RESPONSE
TPS61032
LINE TRANSIENT RESPONSE
V = 2.2 V to 2.7 V,
I
V = 2.5 V,
Output Current
500 mA/Div, DC
I
Input Voltage
500 mV/Div, DC
R
L
= 50 W
I
L
= 80 mA to 800 mA
Output Voltage
20 mV/Div, AC
Output Voltage
50 mV/Div, AC
Timebase - 2 ms/Div
Figure 15.
Timebase - 2 ms/Div
Figure 16.
TPS61032
DC/DC CONVERTER START-UP AFTER ENABLE
Enable
5 V/Div, DC
Output Voltage
2 V/Div, DC
Input Current
500 mA/Div, DC
Voltage at SW
2 V/Div, DC
V = 2.4 V,
I
R
L
= 20 W
Timebase - 400 µs/Div
Figure 17.
10
TPS61030
TPS61031, TPS61032
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SLUS534D–SEPTEMBER 2002–REVISED APRIL 2004
DETAILED DESCRIPTION
Controller Circuit
The controller circuit of the device is based on a fixed frequency multiple feedforward controller topology. Input
voltage, output voltage, and voltage drop on the NMOS switch are monitored and forwarded to the regulator. So
changes in the operating conditions of the converter directly affect the duty cycle and must not take the indirect
and slow way through the control loop and the error amplifier. The control loop, determined by the error amplifier,
only has to handle small signal errors. The input for it is the feedback voltage on the FB pin or, at fixed output
voltage versions, the voltage on the internal resistor divider. It is compared with the internal reference voltage to
generate an accurate and stable output voltage.
The peak current of the NMOS switch is also sensed to limit the maximum current flowing through the switch and
the inductor. The typical peak current limit is set to 4000 mA. An internal temperature sensor prevents the device
from getting overheated in case of excessive power dissipation.
Synchronous Rectifier
The device integrates an N-channel and a P-channel MOSFET transistor to realize a synchronous rectifier.
Because the commonly used discrete Schottky rectifier is replaced with a low RDS(ON) PMOS switch, the power
conversion efficiency reaches 96%. To avoid ground shift due to the high currents in the NMOS switch, two
separate ground pins are used. The reference for all control functions is the GND pin. The source of the NMOS
switch is connected to PGND. Both grounds must be connected on the PCB at only one point close to the GND
pin. A special circuit is applied to disconnect the load from the input during shutdown of the converter. In
conventional synchronous rectifier circuits, the backgate diode of the high-side PMOS is forward biased in
shutdown and allows current flowing from the battery to the output. This device however uses a special circuit
which takes the cathode of the backgate diode of the high-side PMOS and disconnects it from the source when
the regulator is not enabled (EN = low).
The benefit of this feature for the system design engineer is that the battery is not depleted during shutdown of
the converter. No additional components have to be added to the design to make sure that the battery is
disconnected from the output of the converter.
Device Enable
The device is put into operation when EN is set high. It is put into a shutdown mode when EN is set to GND. In
shutdown mode, the regulator stops switching, all internal control circuitry including the low-battery comparator is
switched off, and the load is isolated from the input (as described in the Synchronous Rectifier Section). This
also means that the output voltage can drop below the input voltage during shutdown. During start-up of the
converter, the duty cycle and the peak current are limited in order to avoid high peak currents drawn from the
battery.
Undervoltage Lockout
An undervoltage lockout function prevents device start-up if the supply voltage on VBAT is lower than
approximately 1.6 V. When in operation and the battery is being discharged, the device automatically enters the
shutdown mode if the voltage on VBAT drops below approximately 1.6 V. This undervoltage lockout function is
implemented in order to prevent the malfunctioning of the converter.
Softstart
When the device enables the internal start-up cycle starts with the first step, the precharge phase. During
precharge, the rectifying switch is turned on until the output capacitor is charged to a value close to the input
voltage. The rectifying switch current is limited in that phase. This also limits the output current under short-circuit
conditions at the output. After charging the output capacitor to the input voltage the device starts switching. Until
the output voltage is reached, the boost switch current limit is set to 40% of its nominal value to avoid high peak
currents at the battery during startup. When the output voltage is reached, the regulator takes control and the
switch current limit is set back to 100%.
11
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SLUS534D–SEPTEMBER 2002–REVISED APRIL 2004
Detailed Description (continued)
Power Save Mode and Synchronization
The SYNC pin can be used to select different operation modes. To enable power save, SYNC must be set low.
Power save mode is used to improve efficiency at light load. In power save mode the converter only operates
when the output voltage trips below a set threshold voltage. It ramps up the output voltage with one or several
pulses and goes again into power save mode once the output voltage exceeds the set threshold voltage. This
power save mode can be disabled by setting the SYNC to VBAT.
Applying an external clock with a duty cycle between 30% and 70% at the SYNC pin forces the converter to
operate at the applied clock frequency. The external frequency has to be in the range of about ±20% of the
nominal internal frequency. Detailed values are shown in the electrical characteristic section of the data sheet.
Low Battery Detector Circuit—LBI/LBO
The low-battery detector circuit is typically used to supervise the battery voltage and to generate an error flag
when the battery voltage drops below a user-set threshold voltage. The function is active only when the device is
enabled. When the device is disabled, the LBO pin is high-impedance. The switching threshold is 500 mV at LBI.
During normal operation, LBO stays at high impedance when the voltage, applied at LBI, is above the threshold.
It is active low when the voltage at LBI goes below 500 mV.
The battery voltage, at which the detection circuit switches, can be programmed with a resistive divider
connected to the LBI pin. The resistive divider scales down the battery voltage to a voltage level of 500 mV,
which is then compared to the LBI threshold voltage. The LBI pin has a built-in hysteresis of 10 mV. See the
application section for more details about the programming of the LBI threshold. If the low-battery detection
circuit is not used, the LBI pin should be connected to GND (or to VBAT) and the LBO pin can be left
unconnected. Do not let the LBI pin float.
Low-EMI Switch
The device integrates a circuit that removes the ringing that typically appears on the SW node when the
converter enters discontinuous current mode. In this case, the current through the inductor ramps to zero and the
rectifying PMOS switch is turned off to prevent a reverse current flowing from the output capacitors back to the
battery. Due to the remaining energy that is stored in parasitic components of the semiconductor and the
inductor, a ringing on the SW pin is induced. The integrated antiringing switch clamps this voltage to VBAT and
therefore dampens ringing.
12
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TPS61031, TPS61032
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SLUS534D–SEPTEMBER 2002–REVISED APRIL 2004
APPLICATION INFORMATION
Design Procedure
The TPS6103x dc/dc converters are intended for systems powered by a dual or triple cell NiCd or NiMH battery
with a typical terminal voltage between 1.8 V and 5.5 V. They can also be used in systems powered by one-cell
Li-Ion with a typical stack voltage between 2.5 V and 4.2 V. Additionally, two or three primary and secondary
alkaline battery cells can be the power source in systems where the TPS6103x is used.
Programming the Output Voltage
The output voltage of the TPS61030 dc/dc converter section can be adjusted with an external resistor divider.
The typical value of the voltage on the FB pin is 500 mV. The maximum allowed value for the output voltage is
5.5 V. The current through the resistive divider should be about 100 times greater than the current into the FB
pin. The typical current into the FB pin is 0.01 µA, and the voltage across R6 is typically 500 mV. Based on those
two values, the recommended value for R4 should be lower than 500 kΩ, in order to set the divider current at 1
µA or higher. Because of internal compensation circuitry the value for this resistor should be in the range of 200
kΩ. From that, the value of resistor R3, depending on the needed output voltage (VO), can be calculated using
equation 1:
V
V
O
O
R3 + R4
* 1 + 180 kW
* 1
ǒ Ǔ ǒ Ǔ
V
500 mV
FB
(1)
If as an example, an output voltage of 3.3 V is needed, a 1-MΩ resistor should be chosen for R3. If for any
reason the value for R4 is chosen significantly lower than 200 kΩ additional capacitance in parallel to R3 is
recommended. The required capacitance value can be easily calculated using Equation 2:
200 kW
R4
ǒ
–1Ǔ
C
+ 10 pF
parR3
(2)
L1
V
CC
VOUT
FB
SW
Boost Output
C2
C3
VBAT
R3
R4
R1
Power
Supply
C1
EN
R6
LBI
R2
SYNC
GND
LBO
Control Output
PGND
TPS6103x
Figure 18. Typical Application Circuit for Adjustable Output Voltage Option
Programming the LBI/LBO Threshold Voltage
The current through the resistive divider should be about 100 times greater than the current into the LBI pin. The
typical current into the LBI pin is 0.01 µA, and the voltage across R2 is equal to the LBI voltage threshold that is
generated on-chip, which has a value of 500 mV. The recommended value for R2 is therefore in the range of 500
kΩ. From that, the value of resistor R1, depending on the desired minimum battery voltage VBAT, can be
calculated using Equation 3.
13
TPS61030
TPS61031, TPS61032
www.ti.com
SLUS534D–SEPTEMBER 2002–REVISED APRIL 2004
APPLICATION INFORMATION (continued)
V
V
BAT
BAT
R1 + R2
* 1 + 390 kW
* 1
ǒ
Ǔ ǒ Ǔ
V
500 mV
LBI*threshold
(3)
The output of the low battery supervisor is a simple open-drain output that goes active low if the dedicated
battery voltage drops below the programmed threshold voltage on LBI. The output requires a pullup resistor with
a recommended value of 1 MΩ. The maximum voltage which is used to pull up the LBO outputs should not
exceed the output voltage of the dc/dc converter. If not used, the LBO pin can be left floating or tied to GND.
Inductor Selection
A boost converter normally requires two main passive components for storing energy during the conversion. A
boost inductor and a storage capacitor at the output are required. To select the boost inductor, it is
recommended to keep the possible peak inductor current below the current limit threshold of the power switch in
the chosen configuration. For example, the current limit threshold of the TPS6103x's switch is 4500 mA at an
output voltage of 5 V. The highest peak current through the inductor and the switch depends on the output load,
the input (VBAT), and the output voltage (VOUT). Estimation of the maximum average inductor current can be done
using Equation 4:
V
OUT
0.8
I
+ I
L
OUT
V
BAT
(4)
For example, for an output current of 1000 mA at 5 V, at least 3500 mA of average current flows through the
inductor at a minimum input voltage of 1.8 V.
The second parameter for choosing the inductor is the desired current ripple in the inductor. Normally, it is
advisable to work with a ripple of less than 20% of the average inductor current. A smaller ripple reduces the
magnetic hysteresis losses in the inductor, as well as output voltage ripple and EMI. But in the same way,
regulation time at load changes rises. In addition, a larger inductor increases the total system costs. With those
parameters, it is possible to calculate the value for the inductor by using Equation 5:
ǒVOUT BATǓ
V
–V
BAT
L +
DI ƒ V
L
OUT
(5)
Parameter f is the switching frequency and ∆IL is the ripple current in the inductor, i.e., 10% × IL. In this example,
the desired inductor has the value of 5.5 µH. In typical applications a 6.8 µH inductance is recommended. The
minimum possible inductance value is 2.2 µH. With the calculated inductance and current values, it is possible to
choose a suitable inductor. Care has to be taken that load transients and losses in the circuit can lead to higher
currents as estimated in equation 4. Also, the losses in the inductor caused by magnetic hysteresis losses and
copper losses are a major parameter for total circuit efficiency.
The following inductor series from different suppliers have been used with the TPS6103x converters:
List of Inductors
VENDOR
INDUCTOR SERIES
CDRH124
Sumida
CDRH103R
CDRH104R
7447779___
744771___
Wurth Electronik
EPCOS
B82464G
14
TPS61030
TPS61031, TPS61032
www.ti.com
SLUS534D–SEPTEMBER 2002–REVISED APRIL 2004
Capacitor Selection
Input Capacitor
At least a 10-µF input capacitor is recommended to improve transient behavior of the regulator and EMI behavior
of the total power supply circuit. A ceramic capacitor or a tantalum capacitor with a 100-nF ceramic capacitor in
parallel, placed close to the IC, is recommended.
Output Capacitor
The major parameter necessary to define the output capacitor is the maximum allowed output voltage ripple of
the converter. This ripple is determined by two parameters of the capacitor, the capacitance and the ESR. It is
possible to calculate the minimum capacitance needed for the defined ripple, supposing that the ESR is zero, by
using Equation 6:
ǒVOUT BATǓ
I
* V
OUT
C
+
min
ƒ DV V
OUT
(6)
Parameter f is the switching frequency and ∆V is the maximum allowed ripple.
With a chosen ripple voltage of 10 mV, a minimum capacitance of 100 µF is needed. The total ripple is larger
due to the ESR of the output capacitor. This additional component of the ripple can be calculated using
Equation 7:
DV
I
R
ESR
OUT
ESR
(7)
An additional ripple of 80 mV is the result of using a tantalum capacitor with a low ESR of 80 mΩ. The total ripple
is the sum of the ripple caused by the capacitance and the ripple caused by the ESR of the capacitor. In this
example, the total ripple is 90 mV. Additional ripple is caused by load transients. This means that the output
capacitance needs to be larger than calculated above to meet the total ripple requirements.
The output capacitor must completely supply the load during the charging phase of the inductor. A reasonable
value of the output capacitance depends on the speed of the load transients and the load current during the load
change. With the calculated minimum value of 100 µF and load transient considerations, a recommended output
capacitance value is in around 220 µF. For economical reasons this usually is a tantalum capacitor. Because of
this the control loop has been optimized for using output capacitors with an ESR of above 30 mΩ. The minimum
value for the output capacitor is 22 µF.
Small Signal Stability
When using output capacitors with lower ESR, like ceramics, it is recommended to use the adjustable voltage
version. The missing ESR can be easily compensated there in the feedback divider. Typically a capacitor in the
range of 10 pF in parallel to R3 helps to obtain small signal stability with lowest ESR output capacitors. For more
detailed analysis the small signal transfer function of the error amplifier and regulator, which is given in Equation
8, can be used.
5 (R3 ) R4)
R4 (1 ) i w 2.3 ms)
d
A
+
+
REG
V
FB
(8)
LAYOUT CONSIDERATIONS
As for all switching power supplies, the layout is an important step in the design, especially at high peak currents
and high switching frequencies. If the layout is not carefully done, the regulator could show stability problems as
well as EMI problems. Therefore, use wide and short traces for the main current path and for the power ground
tracks. The input capacitor, output capacitor, and the inductor should be placed as close as possible to the IC.
Use a common ground node for power ground and a different one for control ground to minimize the effects of
ground noise. Connect these ground nodes at any place close to one of the ground pins of the IC.
The feedback divider should be placed as close as possible to the control ground pin of the IC. To lay out the
control ground, it is recommended to use short traces as well, separated from the power ground traces. This
avoids ground shift problems, which can occur due to superimposition of power ground current and control
ground current.
15
TPS61030
TPS61031, TPS61032
www.ti.com
SLUS534D–SEPTEMBER 2002–REVISED APRIL 2004
Layout Considerations (continued)
L1
V
5 V
CC
VOUT
FB
SW
6.8 µH
Boost Output
C2
2.2 µF
C3
220 µF
VBAT
Battery
Input
R1
R2
C1
EN
10 µF
R6
LBI
SYNC
GND
LBO
LBO
PGND
TPS61032
List of Components:
U1 = TPS6103xPWP
L1 = Sumida CDRH124–6R8
C1, C2 = X7R,X5R Ceramic
C3 = Low ESR Tantalum
Figure 19. Power Supply Solution for Maximum Output Power
V
10 V
CC2
C5
Unregulated
Auxiliary Output
DS1
C6
1 µF
0.1 µF
L1
V
5 V
SW
CC1
VOUT
FB
6.8 µH
Boost Main Output
C2
2.2 µF
C3
220 µF
VBAT
EN
Battery
Input
R1
C3
10 µF
R6
LBI
R2
SYNC
GND
LBO
LBO
PGND
List of Components:
U1 = TPS6103xPWP
TPS61032
L1 = Sumida CDRH124–6R8
C3, C5, C6, = X7R,X5R Ceramic
C3 = Low ESR Tantalum
DS1 = BAT54S
Figure 20. Power Supply Solution With Auxiliary Positive Output Voltage
16
TPS61030
TPS61031, TPS61032
www.ti.com
SLUS534D–SEPTEMBER 2002–REVISED APRIL 2004
Layout Considerations (continued)
V
–5 V
CC2
C5
Unregulated
Auxiliary Output
DS1
C6
1 µF
0.1 µF
L1
V
5 V
SW
CC1
VOUT
6.8 µH
Boost Main Output
C2
2.2 µF
C3
220 µF
VBAT
EN
Battery
Input
R1
C1
10 µF
R6
FB
LBI
R2
SYNC
GND
LBO
LBO
PGND
TPS61032
List of Components:
U1 = TPS6103xPWP
L1 = Sumida CDRH124–6R8
C1, C2, C5, C6 = X7R,X5R Ceramic
C3 = Low ESR Tantalum
DS1 = BAT54S
Figure 21. Power Supply Solution With Auxiliary Negative Output Voltage
THERMAL INFORMATION
Implementation of integrated circuits in low-profile and fine-pitch surface-mount packages typically requires
special attention to power dissipation. Many system-dependent issues such as thermal coupling, airflow, added
heat sinks and convection surfaces, and the presence of other heat-generating components affect the
power-dissipation limits of a given component.
Three basic approaches for enhancing thermal performance are listed below:
•
•
•
Improving the power dissipation capability of the PCB design
Improving the thermal coupling of the component to the PCB
Introducing airflow in the system
The maximum junction temperature (TJ) of the TPS6103x devices is 125°C. The thermal resistance of the 16-pin
TSSOP PowerPAD package (PWP) is RΘJA = 36.5 °C/W (QFN package, RSA, 38.1 °C/W), if the PowerPAD is
soldered. Specified regulator operation is assured to a maximum ambient temperature TA of 85°C. Therefore, the
maximum power dissipation for the PWP package is about 1096 mW, for the RSA package it is about 1050 mW.
More power can be dissipated if the maximum ambient temperature of the application is lower.
T
* T
J(MAX)
R
A
125°C * 85°C
36.5°CńW
P
+
+
D(MAX)
qJA
17
PACKAGE OPTION ADDENDUM
www.ti.com
16-Jul-2010
PACKAGING INFORMATION
Status (1)
Eco Plan (2)
MSL Peak Temp (3)
Samples
Orderable Device
Package Type Package
Drawing
Pins
Package Qty
Lead/
Ball Finish
(Requires Login)
TPS61030PWP
TPS61030PWPG4
TPS61030PWPR
TPS61030PWPRG4
TPS61030RSAR
TPS61030RSARG4
TPS61031PWP
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
HTSSOP
HTSSOP
HTSSOP
HTSSOP
QFN
PWP
PWP
PWP
PWP
RSA
RSA
PWP
PWP
PWP
PWP
RSA
RSA
PWP
PWP
PWP
PWP
RSA
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
90
Green (RoHS
& no Sb/Br)
CU NIPDAU Level-2-260C-1 YEAR
Purchase Samples
90
Green (RoHS
& no Sb/Br)
CU NIPDAU Level-2-260C-1 YEAR
CU NIPDAU Level-2-260C-1 YEAR
CU NIPDAU Level-2-260C-1 YEAR
CU NIPDAU Level-2-260C-1 YEAR
CU NIPDAU Level-2-260C-1 YEAR
CU NIPDAU Level-2-260C-1 YEAR
CU NIPDAU Level-2-260C-1 YEAR
CU NIPDAU Level-2-260C-1 YEAR
CU NIPDAU Level-2-260C-1 YEAR
CU NIPDAU Level-2-260C-1 YEAR
CU NIPDAU Level-2-260C-1 YEAR
CU NIPDAU Level-2-260C-1 YEAR
CU NIPDAU Level-2-260C-1 YEAR
CU NIPDAU Level-2-260C-1 YEAR
CU NIPDAU Level-2-260C-1 YEAR
CU NIPDAU Level-2-260C-1 YEAR
Purchase Samples
Request Free Samples
Request Free Samples
Request Free Samples
Request Free Samples
2000
2000
3000
3000
90
Green (RoHS
& no Sb/Br)
Green (RoHS
& no Sb/Br)
Green (RoHS
& no Sb/Br)
QFN
Green (RoHS
& no Sb/Br)
HTSSOP
HTSSOP
HTSSOP
HTSSOP
QFN
Green (RoHS
& no Sb/Br)
Contact TI Distributor
or Sales Office
TPS61031PWPG4
TPS61031PWPR
TPS61031PWPRG4
TPS61031RSAR
TPS61031RSARG4
TPS61032PWP
90
Green (RoHS
& no Sb/Br)
Contact TI Distributor
or Sales Office
2000
2000
3000
3000
90
Green (RoHS
& no Sb/Br)
Request Free Samples
Request Free Samples
Request Free Samples
Request Free Samples
Purchase Samples
Green (RoHS
& no Sb/Br)
Green (RoHS
& no Sb/Br)
QFN
Green (RoHS
& no Sb/Br)
HTSSOP
HTSSOP
HTSSOP
HTSSOP
QFN
Green (RoHS
& no Sb/Br)
TPS61032PWPG4
TPS61032PWPR
TPS61032PWPRG4
TPS61032RSAR
90
Green (RoHS
& no Sb/Br)
Purchase Samples
2000
2000
3000
Green (RoHS
& no Sb/Br)
Request Free Samples
Request Free Samples
Request Free Samples
Green (RoHS
& no Sb/Br)
Green (RoHS
& no Sb/Br)
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
16-Jul-2010
Status (1)
Eco Plan (2)
MSL Peak Temp (3)
Samples
Orderable Device
Package Type Package
Drawing
Pins
Package Qty
Lead/
Ball Finish
(Requires Login)
TPS61032RSARG4
ACTIVE
QFN
RSA
16
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU Level-2-260C-1 YEAR
Request Free Samples
(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.
(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.
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.
Addendum-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
15-Mar-2010
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
B0
K0
P1
W
Pin1
Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant
(mm) W1 (mm)
TPS61030PWPR
TPS61030RSAR
TPS61031PWPR
TPS61031RSAR
TPS61032PWPR
TPS61032RSAR
HTSSOP PWP
QFN RSA
HTSSOP PWP
QFN RSA
HTSSOP PWP
QFN RSA
16
16
16
16
16
16
2000
3000
2000
3000
2000
3000
330.0
330.0
330.0
330.0
330.0
330.0
12.4
12.4
12.4
12.4
12.4
12.4
6.9
4.3
6.9
4.3
6.9
4.3
5.6
4.3
5.6
4.3
5.6
4.3
1.6
1.5
1.6
1.5
1.6
1.5
8.0
8.0
8.0
8.0
8.0
8.0
12.0
12.0
12.0
12.0
12.0
12.0
Q1
Q2
Q1
Q2
Q1
Q2
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
15-Mar-2010
*All dimensions are nominal
Device
Package Type Package Drawing Pins
SPQ
Length (mm) Width (mm) Height (mm)
TPS61030PWPR
TPS61030RSAR
TPS61031PWPR
TPS61031RSAR
TPS61032PWPR
TPS61032RSAR
HTSSOP
QFN
PWP
RSA
PWP
RSA
PWP
RSA
16
16
16
16
16
16
2000
3000
2000
3000
2000
3000
346.0
340.5
346.0
340.5
346.0
340.5
346.0
333.0
346.0
333.0
346.0
333.0
29.0
20.6
29.0
20.6
29.0
20.6
HTSSOP
QFN
HTSSOP
QFN
Pack Materials-Page 2
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LOW-POWER DC/DC BOOST CONVERTER IN SOT-23 AND SON PACKAGESWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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TI
TPS61040DBVT
Analog ICWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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ETC
TPS61040DDC
暂无描述Warning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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TI
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