Product
Folder
Sample &
Buy
Support &
Community
Tools &
Software
Technical
Documents
TPS630250
TPS630251, TPS630252
SLVSBJ9B – MAY 2014 – REVISED MARCH 2015
TPS63025x High Current, High Efficiency Single Inductor Buck-Boost Converter
1 Features
3 Description
•
The TPS63025x are high efficiency, low quiescent
current buck-boost converters suitable for application
where the input voltage is higher or lower than the
output. Output currents can go as high as 2 A in
boost mode and as high as 4 A in buck mode. The
maximum average current in the switches is limited to
a typical value of 4 A. The TPS63025x regulates the
output voltage over the complete input voltage range
by automatically switching between buck or boost
mode depending on the input voltage ensuring a
seamless transition between modes. The buck-boost
converter is based on a fixed frequency, pulse-widthmodulation (PWM) controller using synchronous
rectification to obtain highest efficiency. At low load
currents, the converter enters Power Save Mode to
maintain high efficiency over the complete load
current range. There is a PFM/PWM pin that allows
the user to choose between automatic PFM/PWM
mode operation and forced PWM operation. During
PWM mode a fixed-frequency of typically 2.5 MHz is
used. The output voltage is programmable using an
external resistor divider, or is fixed internally on the
chip. The converter can be disabled to minimize
battery drain. During shutdown, the load is
disconnected from the battery. The device is
packaged in a 20-pin WCSP package measuring
1.766 mm x 2.086mm and 14-pin HotRod package
measuring 2.5 mm x 3mm.
1
•
•
•
•
•
•
•
•
•
•
•
•
•
Real Buck or Boost Operation with Automatic and
Seamless Transition Between Buck and Boost
Operation
2.3 V to 5.5 V input voltage range
2 A Continuous Output Current : VIN≥ 2.5 V,
VOUT= 3.3 V
Adjustable and Fixed Output Voltage
Efficiency up to 95% in Buck or Boost Mode and
up to 97% when VIN=VOUT
2.5MHz Typical Switching Frequency
35-μA Operating Quiescent Current
Integrated Soft Start
Power Save Mode
True Shutdown Function
Output Capacitor Discharge Function
Over-Temperature Protection and Over-Current
Protection
Wide Capacitance Selection
Small 1.766 mm x 2.086 mm, 20-pin WCSP and
2.5 mm x 3 mm, 14-pin Hot Rod
2 Applications
•
•
•
•
•
Cellular Phones, Smart Phones
Tablets PC
PC and Smart Phone accessories
Point of load regulation
Battery Powered Applications
Device Information(1)
PART NUMBER
TPS63025x
PACKAGE
BODY SIZE (NOM)
DSBGA (20)
1.766 mm × 2.086 mm
VQFN (14)(2)
2.5 mm x 3 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
(2) Product Preview
4 Typical Application
sp
Efficiency vs Output Current
L1 1µH
TPS63025
C1
L1
VOUT
3.3 V up to 2A
L2
VIN
VOUT
EN
FB
10µF
C2
2X22µF
VINA
PFM/
PWM
GND
PGND
Efficiency (%)
VIN
2.7 V to 5.5 V
VIN = 2.8V, V OUT = 3.3V
VIN = 3.3V, V OUT = 3.3V
VIN = 3.6V, V OUT = 3.3V
VIN = 4.2V, V OUT = 3.3V
TPS63025, Power Save Enabled
0.1
Output Current (mA)
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. UNLESS OTHERWISE NOTED, this document contains PRODUCTION
DATA.
TPS630250
TPS630251, TPS630252
SLVSBJ9B – MAY 2014 – REVISED MARCH 2015
www.ti.com
Table of Contents
1
2
3
4
5
6
7
8
9
Features ..................................................................
Applications ...........................................................
Description .............................................................
Typical Application ................................................
Revision History.....................................................
Device Comparison Table.....................................
Pin Configuration and Functions .........................
Specifications.........................................................
1
1
1
1
2
3
3
4
8.1
8.2
8.3
8.4
8.5
8.6
8.7
4
4
4
5
5
6
6
Absolute Maximum Ratings ......................................
ESD Ratings ............................................................
Recommended Operating Conditions.......................
Thermal Information ..................................................
Electrical Characteristics...........................................
Timing Requirements ................................................
Typical Characteristics ..............................................
Detailed Description .............................................. 7
9.1 Overview ................................................................... 7
9.2 Functional Block Diagram ......................................... 7
9.3 Feature Description................................................... 8
9.4 Device Functional Modes........................................ 10
10 Application and Implementation........................ 13
10.1 Application Information.......................................... 13
10.2 Typical Application ............................................... 13
11 Power Supply Recommendations ..................... 20
12 Layout................................................................... 20
12.1 Layout Guidelines ................................................. 20
12.2 Layout Example .................................................... 20
13 Device and Documentation Support ................. 21
13.1
13.2
13.3
13.4
13.5
13.6
Device Support ....................................................
Documentation Support .......................................
Related Links ........................................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
21
21
21
21
21
21
14 Mechanical, Packaging, and Orderable
Information ........................................................... 21
5 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision A (May 2014) to Revision B
Page
•
Added VQFN (RNC) package option .................................................................................................................................... 3
•
Changed UVLO in the Electrical Characteristics From: MAX = 1.9 V To: 2 V ...................................................................... 5
Changes from Original (May 2014) to Revision A
Page
•
Added devices TPS630250, TPS630251, and TPS630252 voltage options ......................................................................... 1
•
Added Specifications, Detailed Description section, Application and Implementation section, Power Supply
Recommendations section, Layout section, Device and Documentation Support section; and, changed status to
Production Data. .................................................................................................................................................................... 4
•
Changed Load Regulation Typ spec from "125 mV/A" to "2.5 mV/A" ................................................................................... 6
2
Submit Documentation Feedback
Copyright © 2014–2015, Texas Instruments Incorporated
Product Folder Links: TPS630251 TPS630252
TPS630250
TPS630251, TPS630252
www.ti.com
6
SLVSBJ9B – MAY 2014 – REVISED MARCH 2015
Device Comparison Table
PART NUMBER
VOUT
TPS630250
Adjustable
TPS630251
2.9 V
TPS630252
3.3 V
7 Pin Configuration and Functions
VQFN 14-Pin
RNC Package
Top View
DSBGA 20-Pin
YFF Package
Top View
E1
D1
C1
B1
A1
4
3
E2
D2
C2
B2
A2
5
13
E3
D3
C3
B3
A3
6
12
E4
D4
C4
B4
A4
7
8
2
9
1
10
14
11
Product Preview
Pin Functions
PIN
I/O
DESCRIPTION
NAME
DSBGA
RNC
VOUT
A1,A2,A3
12, 13, 14
FB
A4
11
L2
B1,B2,B3
1
B4
10
C1,C2,C3
2
PWR Power Ground
C4
9
PWR Analog Ground
D1,D2,D3
3
PWR Connection for Inductor
PFM/PWM
PGND
GND
L1
PWR Buck-Boost converter output
IN
Voltage feedback of adjustable version, must be connected to VOUT on fixed output voltage
versions
PWR Connection for Inductor
IN
EN
D4
8
VIN
E1,E2,E3
4, 5, 6
PWR Supply voltage for power stage
E4
7
PWR Supply voltage for control stage.
VINA
IN
set low for PFM mode, set high for forced PWM mode. It must not be left floating
Enable input. Set high to enable and low to disable. It must not be left floating.
Copyright © 2014–2015, Texas Instruments Incorporated
Product Folder Links: TPS630251 TPS630252
Submit Documentation Feedback
3
TPS630250
TPS630251, TPS630252
SLVSBJ9B – MAY 2014 – REVISED MARCH 2015
www.ti.com
8 Specifications
8.1 Absolute Maximum Ratings (1)
over junction temperature range (unless otherwise noted)
VALUE
Voltage
(2)
MIN
MAX
UNIT
VIN, L1, EN, VINA, PFM/PWM
–0.3
7
V
VOUT, FB
–0.3
4
V
L2 (3)
–0.3
4
V
(4)
-0.3
5.5
V
2.7
A
L2
Input current
Continuos average current into L1 (5)
TJ
Operating junction temperature
–40
125
Tstg
Storage temperature range
–65
150
(1)
(2)
(3)
(4)
(5)
°C
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
All voltage values are with respect to network ground pin.
DC voltage rating.
AC voltage rating.
Maximum continuos average input current 3.5A, under those condition do not exceed 105°C for more than 25% operating time.
8.2 ESD Ratings
VALUE
Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001
V(ESD)
(1)
(2)
Electrostatic discharge
(1)
UNIT
±2000
Charged-device model (CDM), per JEDEC specification JESD22C101 (2)
V
±700
JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
8.3 Recommended Operating Conditions (1)
MAX
UNIT
VIN
Input Voltage Range
MIN
2.3
5.5
V
VOUT
Output Voltage
2.5
3.6
V
L
Inductance
1.3
µH
Cout
Output Capacitance (3)
20
TA
Operating ambient temperature
–40
85
°C
TJ
Operating virtual junction temperature
–40
125
°C
(1)
(2)
(3)
4
(2)
0.5
TYP
1
µF
Refer to the Application Information section for further information
Effective inductance value at operating condition. The nominal value given matches a typical inductor to be chosen to meet the
inductance required.
Due to the dc bias effect of ceramic capacitors, the effective capacitance is lower then the nominal value when a voltage is applied. This
is why the capacitance is specified to allow the selection of the nominal capacitor required with the dc bias effect for this type of
capacitor. The nominal value given matches a typical capacitor to be chosen to meet the minimum capacitance required.
Submit Documentation Feedback
Copyright © 2014–2015, Texas Instruments Incorporated
Product Folder Links: TPS630251 TPS630252
TPS630250
TPS630251, TPS630252
www.ti.com
SLVSBJ9B – MAY 2014 – REVISED MARCH 2015
8.4 Thermal Information
TPS63025x
THERMAL METRIC (1)
YFF (DSBGA)
RNC (VQFN) (2)
20 PINS
14 PINS
71.1
69.2
RθJA
Junction-to-ambient thermal resistance
RθJC(top)
Junction-to-case (top) thermal resistance
0.5
38.2
RθJB
Junction-to-board thermal resistance
11.4
12.7
ψJT
Junction-to-top characterization parameter
2
1.9
ψJB
Junction-to-board characterization parameter
11.3
12.7
RθJC(bot)
Junction-to-case (bottom) thermal resistance
N/A
N/A
(1)
(2)
UNIT
°C/W
For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
Product Preview
8.5 Electrical Characteristics
VIN= 2.3V to 5.5V, TJ= –40°C to 125°C, typical values are at TA= 25°C (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
SUPPLY
VIN
Input voltage range
VIN_Min
Minimum input voltage to turn on into full load
2.3
IOUT
Continuos Output Current
IQ
Quiescent current
Isd
(1)
VIN >=2.5V, VOUT=3.3V
VIN
UVLO
IOUT = 2A
5.5
V
2
A
70
μA
12
μA
0.1
2
μA
1.7
2
IOUT = 0mA, EN = VIN = 3.6V,
VOUT = 3.3V TJ = -40°C to 85°C,
not switching
35
Shutdown current
EN = low, TJ = -40°C to 85°C
Under voltage lockout threshold
VIN falling
VOUT
1.6
Under voltage lockout hysteresis
Thermal shutdown
Temperature rising
Thermal Shutdown hysteresis
V
2.8
V
180
mV
140
°C
20
°C
LOGIC SIGNALS EN, PFM/PWM
VIH
High level input voltage
VIN = 2.3V to 5.5V
VIL
Low level input voltage
VIN = 2.3V to 5.5V
Ilkg
Input leakage current
EN = GND or VIN
1.2
V
0.01
0.4
V
0.2
μA
3.6
V
OUTPUT
VOUT
Output Voltage range
2.3
VFB
Feedback regulation voltage
VFB
Feedback voltage accuracy
VFB
Feedback voltage accuracy
VOUT
Output voltage accuracy
PWM mode, TPS630251
VOUT
Output voltage accuracy (2)
PFM mode, TPS630251
VOUT
Output voltage accuracy
VOUT
0.8
(2)
PWM mode, TPS630250
-1%
PFM mode, TPS630250
-1%
V
1%
1.3%
+3%
2.871
2.9
2.929
V
2.871
2.938
2.987
V
PWM mode, TPS630252
3.267
3.3
3.333
V
Output voltage accuracy (2)
PFM mode, TPS630252
3.267
3.343
3.399
V
IPWM/PFM
Output current to enter PFM mode
VIN = 3V; VOUT = 3.3V
IFB
Feedback input bias current
VFB = 0.8V
10
High side FET on-resistance
VIN = 3.0V, VOUT = 3.3V
35
mΩ
Low side FET on-resistance
VIN = 3.0V, VOUT = 3.3V
50
mΩ
High side FET on-resistance
VIN = 3.0V, VOUT = 3.3V
25
mΩ
Low side FET on-resistance
VIN = 3.0V, VOUT = 3.3V
50
mΩ
RDS_Buck(on)
RDS_Boost(on)
(1)
(2)
350
mA
100
nA
For minimum output current in a specific working point see Figure 5 and Equation 1 trough Equation 4.
Conditions: L = 1 µH, COUT = 2 × 22 µF.
Copyright © 2014–2015, Texas Instruments Incorporated
Product Folder Links: TPS630251 TPS630252
Submit Documentation Feedback
5
TPS630250
TPS630251, TPS630252
SLVSBJ9B – MAY 2014 – REVISED MARCH 2015
www.ti.com
Electrical Characteristics (continued)
VIN= 2.3V to 5.5V, TJ= –40°C to 125°C, typical values are at TA= 25°C (unless otherwise noted)
PARAMETER
TEST CONDITIONS
VIN = 3.0V, VOUT = 3.3V TJ =
65°C to 125°C
(3)
MIN
TYP
3.5
4.5
MAX UNIT
IIN
Average input current limit
fs
Switching Frequency
2.5
MHz
RON_DISC
Discharge ON-Resistance
EN = low
120
Ω
Line regulation
VIN = 2.8V to 5.5V, IOUT = 2A
7.4
mV/
V
Load regulation
VIN= 3.6V, IOUT = 0A to 2A
5
mV/
A
TYP
MAX UNIT
(3)
5
A
For variation of this parameter with Input voltage and temperature see Figure 5.
8.6 Timing Requirements
VIN= 2.3 V to 5.5 V, TJ= –40°C to 125°C, typical values are at TA= 25°C (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
OUTPUT
tSS
Soft-start time
td
Start up delay
VOUT=EN=low to high, Buck
mode VIN=3.6V, VOUT=3.3V,
IOUT=2A
450
µs
VOUT=EN=low to high, Boost
mode VIN=2.8V, VOUT=3.3V,
IOUT=2A
700
µs
Time from when EN=high to
when device starts switching
100
µs
8.7 Typical Characteristics
0.016
60
TA = -40 ºC
TA = 25 ºC
TA = 85 ºC
Quiescent Current (mA)
Resistance (mS)
50
40
30
20
10
0
2.5
TA = -40 ºC
TA = 25 ºC
TA = 85 ºC
2.8
3.1
3.4
0.008
TPS630252
3.7
4
4.3
Input Voltage (V)
4.6
4.9
5.2
5.5
Figure 1. High Side FET On-Resistance vs Input Voltage
6
0.012
Submit Documentation Feedback
0.004
2.5
2.8
3.1
3.4
3.7
4
4.3 4.6
Input Voltage (V)
4.9
5.2
5.5
Figure 2. Quiescent Current vs Input Voltage
Copyright © 2014–2015, Texas Instruments Incorporated
Product Folder Links: TPS630251 TPS630252
TPS630250
TPS630251, TPS630252
www.ti.com
SLVSBJ9B – MAY 2014 – REVISED MARCH 2015
9 Detailed Description
9.1 Overview
The TPS63025x use 4 internal N-channel MOSFETs to maintain synchronous power conversion at all possible
operating conditions. This enables the device to keep high efficiency over the complete input voltage and output
power range. To regulate the output voltage at all possible input voltage conditions, the device automatically
switches from buck operation to boost operation and back as required by the configuration. It always uses one
active switch, one rectifying switch, one switch is held on, and one switch held off. Therefore, it operates as a
buck converter when the input voltage is higher than the output voltage, and as a boost converter when the input
voltage is lower than the output voltage. There is no mode of operation in which all 4 switches are switching at
the same time. Keeping one switch on and one switch off eliminates their switching losses. The RMS current
through the switches and the inductor is kept at a minimum, to minimize switching and conduction losses.
Controlling the switches this way allows the converter to always keep higher efficiency.
The device provides a seamless transition from buck to boost or from boost to buck operation.
9.2 Functional Block Diagram
L1
L2
VIN
VOUT
Current
Sensor
VIN
VOUT
EN
PGND
_
+
Oscillator
PFM/PWM
EN
PGND
Gate
Control
Modulator
VINA
PGND
Device
Control
_
FB
+
+
-
Temperature
Control
GND
VREF
PGND
PGND
Functional Block Diagram (Adjustable Output Voltage)
Copyright © 2014–2015, Texas Instruments Incorporated
Product Folder Links: TPS630251 TPS630252
Submit Documentation Feedback
7
TPS630250
TPS630251, TPS630252
SLVSBJ9B – MAY 2014 – REVISED MARCH 2015
www.ti.com
Functional Block Diagram (continued)
L1
L2
VIN
VOUT
Current
Sensor
EN
PGND
VIN
VOUT
PGND
FB
_
Modulator
VINA
_
+
+
Oscillator
PFM/PWM
+
-
Device
Control
EN
PGND
Gate
Control
Temperature
Control
VREF
PGND
GND
PGND
Functional Block Diagram (Fixed Output Voltage)
9.3 Feature Description
9.3.1 Undervoltage Lockout (UVLO)
To avoid mis-operation of the device at low input voltages, an undervoltage lockout is included. UVLO shuts
down the device at input voltages lower than typically 1.7 V with a 180 mV hysteresis.
9.3.2 Output Discharge Function
When the device is disabled by pulling enable low and the supply voltage is still applied, the internal transistor
use to discharge the output capacitor is turned on, and the output capacitor is discharged until UVLO is reached.
This means, if there is no supply voltage applied the output discharge function is also disabled. The transistor
which is responsible of the discharge function, when turned on, operates like an equivalent 120-Ω resistor,
ensuring typically less than 10ms discharge time for 20-µF output capacitance and a 3.3 V output.
9.3.3 Thermal Shutdown
The device goes into thermal shutdown once the junction temperature exceeds typically 140°C with a 20°C
hysteresis.
8
Submit Documentation Feedback
Copyright © 2014–2015, Texas Instruments Incorporated
Product Folder Links: TPS630251 TPS630252
TPS630250
TPS630251, TPS630252
www.ti.com
SLVSBJ9B – MAY 2014 – REVISED MARCH 2015
Feature Description (continued)
9.3.4
Softstart
To minimize inrush current and output voltage overshoot during start up, the device has a Softstart. At turn on,
the input current raises monotonic until the output voltage reaches regulation. During Softstart, the input current
follows the current ramp charging the internal Softstart capacitor. The device smoothly ramps up the input current
bringing the output voltage to its regulated value even if a large capacitor is connected at the output.
The Softstart time is measured as the time from when the EN pin is asserted to when the output voltage has
reached 90% of its nominal value. There is typically a 100µs delay time from when the EN pin is asserted to
when the device starts the switching activity. The Softstart time depends on the load current, the input voltage,
and the output capacitor. The Softstart time in boost mode is longer then the time in buck mode. The total typical
Softstart time is 1ms.
The inductor current is able to increase and always assure a soft start unless a real short circuit is applied at the
output.
9.3.5
Short Circuit Protection
The TPS63025x provides short circuit protection to protect itself and the application. When the output voltage
does not increase above 1.2V, the device assumes a short circuit at the output and limits the input current to 4 A.
Copyright © 2014–2015, Texas Instruments Incorporated
Product Folder Links: TPS630251 TPS630252
Submit Documentation Feedback
9
TPS630250
TPS630251, TPS630252
SLVSBJ9B – MAY 2014 – REVISED MARCH 2015
www.ti.com
9.4 Device Functional Modes
9.4.1
Control Loop Description
0.8V
Ramp and Clock
Generator
Figure 3. Average Current Mode Control
The controller circuit of the device is based on an average current mode topology. The average inductor current
is regulated by a fast current regulator loop which is controlled by a voltage control loop. Figure 3 shows the
control loop.
The non inverting input of the transconductance amplifier, gmv, is assumed to be constant. The output of gmv
defines the average inductor current. The inductor current is reconstructed by measuring the current through the
high side buck MOSFET. This current corresponds exactly to the inductor current in boost mode. In buck mode
the current is measured during the on time of the same MOSFET. During the off time, the current is
reconstructed internally starting from the peak value at the end of the on time cycle. The average current and the
feedback from the error amplifier gmv forms the correction signal gmc. This correction signal is compared to the
buck and the boost sawtooth ramp giving the PWM signal. Depending on which of the two ramps the gmc output
crosses either the Buck or the Boost stage is initiated. When the input voltage is close to the output voltage, one
buck cycle is always followed by a boost cycle. In this condition, no more than three cycles in a row of the same
mode are allowed. This control method in the buck-boost region ensures a robust control and the highest
efficiency.
10
Submit Documentation Feedback
Copyright © 2014–2015, Texas Instruments Incorporated
Product Folder Links: TPS630251 TPS630252
TPS630250
TPS630251, TPS630252
www.ti.com
SLVSBJ9B – MAY 2014 – REVISED MARCH 2015
Device Functional Modes (continued)
9.4.2 Power Save Mode Operation
Heavy Load transient step
PFM mode at light load
current
Comparator High
30mV ripple
Vo+1.3%*Vo
Comparator low
Vo
PWM mode
Absolute Voltage drop
with positioning
Figure 4. Power Save Mode Operation
Depending on the load current, in order to provide the best efficiency over the complete load range, the device
works in PWM mode at load currents of approximately 350mA or higher. At lighter loads, the device switches
automatically into Power Save Mode to reduce power consumption and extend battery life. The PFM/PWM pin is
used to select between the two different operation modes. To enable Power Save Mode, the PFM/PWM pin must
be set low.
During Power Save Mode, the part operates with a reduced switching frequency and lowest supply current to
maintain high efficiency. The output voltage is monitored with a comparator at every clock cycle by the thresholds
comp low and comp high. When the device enters Power Save Mode, the converter stops operating and the
output voltage drops. The slope of the output voltage depends on the load and the output capacitance. When the
output voltage reaches the comp low threshold, at the next clock cycle the device ramps up the output voltage
again, by starting operation. Operation can last for one or several pulses until the comp high threshold is
reached. At the next clock cycle, if the load is still lower than about 350mA, the device switches off again and the
same operation is repeated. Instead, if at the next clock cycle, the load is above 350mA, the device automatically
switches to PWM mode.
In order to keep high efficiency in PFM mode, there is only one comparator active to keep the output voltage
regulated. The AC ripple in this condition is increased, compared to the PWM mode. The amplitude of this
voltage ripple in the worst case scenario is 50mV pk-pk, (typically 30 mV pk-pk), with 2-µF effective output
capacitance. In order to avoid a critical voltage drop when switching from 0A to full load, the output voltage in
PFM mode is typically 1.3% above the nominal value in PWM mode. This is called Dynamic Voltage Positioning
and allows the converter to operate with a small output capacitor and still have a low absolute voltage drop
during heavy load transients.
Power Save Mode is disabled by setting the PFM/PWM pin high.
Copyright © 2014–2015, Texas Instruments Incorporated
Product Folder Links: TPS630251 TPS630252
Submit Documentation Feedback
11
TPS630250
TPS630251, TPS630252
SLVSBJ9B – MAY 2014 – REVISED MARCH 2015
www.ti.com
Device Functional Modes (continued)
9.4.3 Current Limit
The current limit variation depends on the difference between the input and output voltage. The maximum current
limit value is at the highest difference.
Given the curves provided in Figure 5, it is possible to calculate the output current reached in boost mode, using
Equation 1 and Equation 2 and in buck mode using Equation 3 and Equation 4.
Duty Cycle Boost
Output Current Boost
Duty Cycle Buck
Output Current Buck
D=
V
-V
IN
OUT
V
OUT
(1)
IOUT = 0 x IIN (1-D)
D=
(2)
V
OUT
V
IN
(3)
IOUT = ( 0 x IIN ) / D
(4)
With,
η = Estimated converter efficiency (use the number from the efficiency curves or 0.90 as an assumption)
IIN= Minimum average input current (Figure 5)
9.4.4 Supply and Ground
The TPS63025x provides two input pins (VIN and VINA) and two ground pins (PGND and GND).
The VIN pin supplies the input power, while the VINA pin provides voltage for the control circuits. A similar
approach is used for the ground pins. GND and PGND are used to avoid ground shift problems due to the high
currents in the switches. The reference for all control functions is the GND pin. The power switches are
connected to PGND. Both grounds must be connected on the PCB at only one point, ideally, close to the GND
pin.
9.4.5 Device Enable
The device starts operation when the EN pin is set high. The device enters shutdown mode when the EN pin is
set low. In shutdown mode, the regulator stops switching, all internal control circuitry is switched off, and the load
is disconnected from the input.
12
Submit Documentation Feedback
Copyright © 2014–2015, Texas Instruments Incorporated
Product Folder Links: TPS630251 TPS630252
TPS630250
TPS630251, TPS630252
www.ti.com
SLVSBJ9B – MAY 2014 – REVISED MARCH 2015
10 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
10.1 Application Information
The TPS63025x are high efficiency, low quiescent current buck-boost converters suitable for application where
the input voltage is higher, lower or equal to the output. Output currents can go as high as 2A in boost mode and
as high as 4A in buck mode. The maximum average current in the switches is limited to a typical value of 4 A.
10.2 Typical Application
L1 1µH
TPS630250
VIN
2.5 V to 5.5 V
L1
C1
VOUT
3.3 V up to 2A
L2
VIN
VOUT
EN
FB
R1
PFM/
PWM
R2
VINA
GND
C2
560k
10µF
VIN or GND
47µF
180k
PGND
3.3V Adjustable Version
10.2.1 Design Requirements
The design guideline provides a component selection to operate the device within the recommended operating
conditions.
Table 1 shows the list of components for the Application Characteristic Curves.
Table 1. Components for Application Characteristic Curves (1)
REFERENCE
DESCRIPTION
MANUFACTURER
TPS630250
Texas Instruments
L1
1 μH, 8.75A, 13mΩ, SMD
XAL4020-102MEB, Coilcraft
C1
10 μF 6.3V, 0603, X5R ceramic
Standard
C2
47 μF 6.3V, 0603, X5R ceramic
Standard
R1
560kΩ
Standard
R2
180kΩ
Standard
(1)
See Third-Party Products Discalimer
Copyright © 2014–2015, Texas Instruments Incorporated
Product Folder Links: TPS630251 TPS630252
Submit Documentation Feedback
13
TPS630250
TPS630251, TPS630252
SLVSBJ9B – MAY 2014 – REVISED MARCH 2015
www.ti.com
10.2.2 Detailed Design Procedure
The first step is the selection of the output filter components. To simplify this process Table 2 outlines possible
inductor and capacitor value combinations.
10.2.2.1 Output Filter Design
Table 2. Matrix of Output Capacitor and Inductor Combinations
NOMINAL OUTPUT CAPACITOR VALUE [µF] (2)
NOMINAL
INDUCTOR
VALUE [µH] (1)
44
47
66
88
100
0.680
+
+
+
+
+
1.0
+ (3)
+
+
+
+
+
+
+
1.5
(1)
(2)
(3)
Inductor tolerance and current de-rating is anticipated. The effective inductance can vary by 20% and –30%.
Capacitance tolerance and bias voltage de-rating is anticipated. The effective capacitance can vary by 20% and –50%.
Typical application. Other check mark indicates recommended filter combinations
10.2.2.2 Inductor Selection
The inductor selection is affected by several parameter like inductor ripple current, output voltage ripple,
transition point into Power Save Mode, and efficiency. See Table 3 for typical inductors.
Table 3. List of Recommended Inductors (1)
(1)
INDUCTOR VALUE
COMPONENT SUPPLIER
SIZE (LxWxH mm)
Isat/DCR
1 µH
Coilcraft XAL4020-102ME
4 X 4 X 2.10
4.5A/10mΩ
1 µH
Toko, DFE322512C
3.2 X 2.5 X 1.2
4.7A/34mΩ
1 µH
TDK, SPM4012
4.4 X 4.1 X 1.2
4.1A/38mΩ
1 µH
Wuerth, 74438334010
3 X 3 X 1.2
6.6A/42.10mΩ
0.6 µH
Coilcraft XFL4012-601ME
4 X 4 X 1.2
5A/17.40mΩ
0.68µH
Wuerth,744383340068
3 X 3 X 1.2
7.7A/36mΩ
See Third-Party Products Desclaimer
For high efficiencies, the inductor should have a low dc resistance to minimize conduction losses. Especially at
high-switching frequencies, the core material has a high impact on efficiency. When using small chip inductors,
the efficiency is reduced mainly due to higher inductor core losses. This needs to be considered when selecting
the appropriate inductor. The inductor value determines the inductor ripple current. The larger the inductor value,
the smaller the inductor ripple current and the lower the conduction losses of the converter. Conversely, larger
inductor values cause a slower load transient response. To avoid saturation of the inductor, the peak current for
the inductor in steady state operation is calculated using Equation 6. Only the equation which defines the switch
current in boost mode is shown, because this provides the highest value of current and represents the critical
current value for selecting the right inductor.
Duty Cycle Boost
IPEAK
D=
V
-V
IN
OUT
V
OUT
(5)
Iout
Vin ´ D
=
+
η ´ (1 - D)
2 ´ f ´ L
(6)
Where,
D =Duty Cycle in Boost mode
f = Converter switching frequency (typical 2.5MHz)
L = Inductor value
η = Estimated converter efficiency (use the number from the efficiency curves or 0.90 as an assumption)
Note: The calculation must be done for the minimum input voltage which is possible to have in boost mode
Calculating the maximum inductor current using the actual operating conditions gives the minimum saturation
current of the inductor needed. It's recommended to choose an inductor with a saturation current 20% higher
than the value calculated using Equation 6. Possible inductors are listed in Table 3.
14
Submit Documentation Feedback
Copyright © 2014–2015, Texas Instruments Incorporated
Product Folder Links: TPS630251 TPS630252
TPS630250
TPS630251, TPS630252
www.ti.com
SLVSBJ9B – MAY 2014 – REVISED MARCH 2015
10.2.2.3 Capacitor Selection
10.2.2.3.1
Input Capacitor
At least a 10μF input capacitor is recommended to improve line transient behavior of the regulator and EMI
behavior of the total power supply circuit. An X5R or X7R ceramic capacitor placed as close as possible to the
VIN and PGND pins of the IC is recommended. This capacitance can be increased without limit. If the input
supply is located more than a few inches from the TPS63025x converter additional bulk capacitance may be
required in addition to the ceramic bypass capacitors. An electrolytic or tantalum capacitor with a value of 47 μF
is a typical choice.
10.2.2.3.2
Output Capacitor
For the output capacitor, use of a small ceramic capacitors placed as close as possible to the VOUT and PGND
pins of the IC is recommended. The recommended nominal output capacitance value is 20 µF with a variance as
outlined in Table 2.
There is also no upper limit for the output capacitance value. Larger capacitors causes lower output voltage
ripple as well as lower output voltage drop during load transients.
10.2.2.4 Setting The Output Voltage
When the adjustable output voltage version TPS63025x is used, the output voltage is set by an external resistor
divider. The resistor divider must be connected between VOUT, FB and GND. When the output voltage is
regulated properly, the typical value of the voltage at the FB pin is 800 mV. The current through the resistive
divider should be about 10 times greater than the current into the FB pin. The typical current into the FB pin is
0.1 μA, and the voltage across the resistor between FB and GND, R2, is typically 800 mV. Based on these two
values, the recommended value for R2 should be lower than 180 kΩ, in order to set the divider current at 4μA or
higher. It is recommended to keep the value for this resistor in the range of 180kΩ. From that, the value of the
resistor connected between VOUT and FB, R1, depending on the needed output voltage (VOUT), can be
calculated using Equation 7:
æV
ö
R1 = R2 × ç OUT - 1÷
V
è FB
ø
(7)
10.2.3 Application Curves
4.5
4
3.5
Efficiency (%)
Minimum Average Input Current (A)
5
3
2.5
2
TPS63025, VOUT = 3.3V
1.5
1
2.3
VIN = 2.8V, V OUT = 3.3V
VIN = 3.3V, V OUT = 3.3V
VIN = 3.6V, V OUT = 3.3V
VIN = 4.2V, V OUT = 3.3V
TA = 25 °C
TA = 85 °C
2.7
3.1
3.5
3.9
4.3
4.7
5.1
TPS63025, Power Save Enabled
5.5
0.1
Input Voltage (V)
Output Current (mA)
Figure 5. Minimum Average Input Current vs Input Voltage
Figure 6. Efficiency vs Output Current
Copyright © 2014–2015, Texas Instruments Incorporated
Product Folder Links: TPS630251 TPS630252
Submit Documentation Feedback
15
TPS630250
TPS630251, TPS630252
www.ti.com
VIN = 2.8V, V OUT = 3.3V
VIN = 3.3V, V OUT = 3.3V
VIN = 3.6V, V OUT = 3.3V
VIN = 4.2V, V OUT = 3.3V
Efficiency (%)
Efficiency (%)
SLVSBJ9B – MAY 2014 – REVISED MARCH 2015
VIN = 2.8V, V OUT = 2.9V
VIN = 2.9V, V OUT = 2.9V
VIN = 3.6V, V OUT = 2.9V
VIN = 4.2V, V OUT = 2.9V
TPS63025, Power Save Disabled
0.1
1
10
100
Output Current (mA)
TPS63025, Power Save Enabled
1k 2k
0.1
VIN = 2.8V, V OUT = 2.9V
VIN = 2.9V, V OUT = 2.9V
VIN = 3.6V, V OUT = 2.9V
VIN = 4.2V, V OUT = 2.9V
1
10
100
IOUT = 10mA
IOUT = 200mA
IOUT = 1A
IOUT = 2A
1k 2k
Input Voltage (V)
Output Current (mA)
Figure 10. Efficiency vs Input Voltage
Efficiency (%)
Efficiency (%)
Figure 9. Efficiency vs Output Current
IOUT = 10mA
IOUT = 200mA
IOUT = 1A
IOUT = 2A
TPS63025, VOUT = 3.3V, Power Save Disabled
IOUT = 10mA
IOUT = 200mA
IOUT = 1A
IOUT = 2A
TPS63025, VOUT = 2.9V, Power Save enabled
Input Voltage (V)
Input Voltage (V)
Figure 11. Efficiency vs Input Voltage
16
Submit Documentation Feedback
1k 2k
TPS63025, VOUT = 3.3V, Power Save enabled
TPS63025, Power Save Disabled
0.1
10
100
Output Current (mA)
Figure 8. Efficiency vs Output Current
Efficiency (%)
Efficiency (%)
Figure 7. Efficiency vs Output Current
1
Figure 12. Efficiency vs Input Voltage
Copyright © 2014–2015, Texas Instruments Incorporated
Product Folder Links: TPS630251 TPS630252
TPS630250
TPS630251, TPS630252
www.ti.com
SLVSBJ9B – MAY 2014 – REVISED MARCH 2015
TPS63025, VOUT = 2.9V, Power Save Disabled
IOUT = 10mA
IOUT = 200mA
IOUT = 1A
IOUT = 2A
VIN = 3.6V
Output Voltage (V)
Efficiency (%)
VIN = 2.8V
VIN = 3.3V
VIN = 4.2V
TPS63025, Power Save Enabled
Output Current (mA)
Input Voltage (V)
Figure 13. Efficiency vs Input Voltage
Figure 14. Output Voltage vs Output Current
TPS63025
VIN = 2.8V
VIN = 3.3V
Output Voltage (V)
VIN = 3.6V
L2
VIN = 4.2V
L1
VOUT_Ripple 50mV/div
VIN = 3.3 V, IOUT = 200mA
Time 2µs/div
Output Current (mA)
Figure 15. Output Voltage vs Output Current
Figure 16. Output Voltage Ripple in Buck-Boost Mode
and PFM to PWM Transition
TPS63025
TPS63025
L2
L2
L1
L1
VOUT_Ripple 50mV/div
VOUT_Ripple 50mV/div
Time 2µs/div
VIN = 2.8 V, VOUT =3.3V, IOUT =16mA
VIN = 2.8 V
Time 2µs/div
VIN = 4.2 V, VOUT =3.3V, IOUT =16mA
IOUT = 16 mA
Figure 17. Output Voltage Ripple in Boost Mode and PFM
Operation
Figure 18. Output Voltage Ripple in Buck Mode
and PFM Operation
Copyright © 2014–2015, Texas Instruments Incorporated
Product Folder Links: TPS630251 TPS630252
Submit Documentation Feedback
17
TPS630250
TPS630251, TPS630252
SLVSBJ9B – MAY 2014 – REVISED MARCH 2015
TPS63025
www.ti.com
TPS63025
L2
L2
L1
L1
VOUT_Ripple 50mV/div
VOUT_Ripple 50mV/div
VIN = 2.5 V, VOUT =3.3V, IOUT =1A
Time 1µs/div
Figure 19. Switching Waveforms in Boost Mode
and PWM Operation
VIN = 4.5V, VOUT =3.3V, IOUT =1A
Time 1µs/div
Figure 20. Switching Waveforms in Buck Mode
and PWM Operation
TPS63025
TPS63025
Output Current
1A/div, DC
L2
L1
Output Voltage
100 mV/div, AC
VOUT_Ripple 50mV/div
Time 1µs/div
VIN = 3.3V, VOUT =3.3V, IOUT =1A
Figure 21. Switching Waveforms in Buck-Boost Mode
and PWM Operation
TPS63025
Time 1 ms/div
VIN = 2.8 V, VOUT = 3.3 V, IOUT = 0A to 1.5A
Figure 22. Load Transient Response Boost Mode
VIN = from 3V to 3.6V, IOUT = 1.5A
TPS63025
Output Current
1A/div, DC
Input Voltage
200 mV/div,
Offset 3V
Output Voltage
100 mV/div, AC
Output Voltage
50 mV/div
Time 1 ms/div
VIN = 4.2 V, VOUT = 3.3 V, IOUT = 0A to 1.5A
Figure 23. Load Transient Response Buck Mode
18
Submit Documentation Feedback
Time 1 ms/div
Figure 24. Line Transient Response
Copyright © 2014–2015, Texas Instruments Incorporated
Product Folder Links: TPS630251 TPS630252
TPS630250
TPS630251, TPS630252
www.ti.com
SLVSBJ9B – MAY 2014 – REVISED MARCH 2015
TPS63025 VOUT = 3.3 V
TPS63025, VOUT = 3.3V
Enable
2 V/div, DC
Enable
2 V/div, DC
Output Voltage
1V/div, DC
Output Voltage
1V/div, DC
Inductor Current
500 mA/div, DC
Time 100 ms/div
VIN = 2.5 V, IL = 0A
Figure 25. Start Up After Enable
Inductor Current
500 mA/div, DC
Time 100 ms/div
VIN = 4.5 V, IL = 0A
Figure 26. Start Up After Enable
Copyright © 2014–2015, Texas Instruments Incorporated
Product Folder Links: TPS630251 TPS630252
Submit Documentation Feedback
19
TPS630250
TPS630251, TPS630252
SLVSBJ9B – MAY 2014 – REVISED MARCH 2015
www.ti.com
11 Power Supply Recommendations
The TPS63025x device family has no special requirements for its input power supply. The input power supply’s
output current needs to be rated according to the supply voltage, output voltage and output current of the
TPS63025x.
12 Layout
12.1 Layout Guidelines
The PCB layout is an important step to maintain the high performance of the TPS63025x devices.
• Place input and output capacitors as close as possible to the IC. Traces need to be kept short. Routing wide
and direct traces to the input and output capacitor results in low trace resistance and low parasitic inductance.
• Use a common-power GND
• Use separate traces for the supply voltage of the power stage; and, the supply voltage of the analog stage.
• The sense trace connected to FB is signal trace. Keep these traces away from L1 and L2 nodes.
12.2 Layout Example
GND
GND
L
COUT
CIN
CIN
COUT
VIN
VOUT
AVIN
FB
R1
R2
EN
PFM/PWM
Figure 27. TPS63025x RNC Package Layout
20
Submit Documentation Feedback
Copyright © 2014–2015, Texas Instruments Incorporated
Product Folder Links: TPS630251 TPS630252
TPS630250
TPS630251, TPS630252
www.ti.com
SLVSBJ9B – MAY 2014 – REVISED MARCH 2015
13 Device and Documentation Support
13.1 Device Support
13.1.1 Third-Party Products Disclaimer
TI'S PUBLICATION OF INFORMATION REGARDING THIRD-PARTY PRODUCTS OR SERVICES DOES NOT
CONSTITUTE AN ENDORSEMENT REGARDING THE SUITABILITY OF SUCH PRODUCTS OR SERVICES
OR A WARRANTY, REPRESENTATION OR ENDORSEMENT OF SUCH PRODUCTS OR SERVICES, EITHER
ALONE OR IN COMBINATION WITH ANY TI PRODUCT OR SERVICE.
13.2 Documentation Support
13.2.1 Related Documentation
For related documentation see the following:
TPS63025EVM-553 User's Guide, TPS63025 High Current, High Efficiency Single Inductor Buck-Boost
Converter, SLVUA24
13.3 Related Links
The table below lists quick access links. Categories include technical documents, support and community
resources, tools and software, and quick access to sample or buy.
Table 4. Related Links
PARTS
PRODUCT FOLDER
SAMPLE & BUY
TECHNICAL
DOCUMENTS
TOOLS &
SOFTWARE
SUPPORT &
COMMUNITY
TPS630250
Click here
Click here
Click here
Click here
Click here
TPS630251
Click here
Click here
Click here
Click here
Click here
TPS630252
Click here
Click here
Click here
Click here
Click here
13.4 Trademarks
All trademarks are the property of their respective owners.
13.5 Electrostatic Discharge Caution
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.
13.6 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
14 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
Copyright © 2014–2015, Texas Instruments Incorporated
Product Folder Links: TPS630251 TPS630252
Submit Documentation Feedback
21
PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
TPS630250RNCR
ACTIVE
VQFN-HR
RNC
14
3000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
63025P
TPS630250RNCT
ACTIVE
VQFN-HR
RNC
14
250
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
63025P
TPS630250YFFR
ACTIVE
DSBGA
YFF
20
3000
RoHS & Green
SNAGCU
Level-1-260C-UNLIM
-40 to 125
TPS
630250
TPS630250YFFT
ACTIVE
DSBGA
YFF
20
250
RoHS & Green
SNAGCU
Level-1-260C-UNLIM
-40 to 125
TPS
630250
TPS630251YFFR
ACTIVE
DSBGA
YFF
20
3000
RoHS & Green
SNAGCU
Level-1-260C-UNLIM
-40 to 125
TPS
630251
TPS630251YFFT
ACTIVE
DSBGA
YFF
20
250
RoHS & Green
SNAGCU
Level-1-260C-UNLIM
-40 to 125
TPS
630251
TPS630252YFFR
ACTIVE
DSBGA
YFF
20
3000
RoHS & Green
SNAGCU
Level-1-260C-UNLIM
-40 to 125
TPS
630252
TPS630252YFFT
ACTIVE
DSBGA
YFF
20
250
RoHS & Green
SNAGCU
Level-1-260C-UNLIM
-40 to 125
TPS
630252
(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)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
工商网监
湘ICP备2023018690号
