Texas Instruments TPS61280-585 User Manual
User's Guide
SLVU955A–December 2013–Revised June 2014
TPS61280-585 Evaluation Module
This User's Guide describes the characteristics, operation, and use of the TPS61280 evaluation module
(EVM). This EVM enables test and evaluation of the Texas Instruments' TPS61280 device, a 2.3-MHz
(typ.), up to 4.8-V input, step-up dc-dc converter with integrated Pass-Through Mode. This User's Guide
includes EVM specifications, user software description, the schematic diagram, bill of materials, and board
layout. After the release of the A-version device in the summer of 2014, the EVM is assembled with the
TPS61280A (supports PWM mode during startup which is not available for TPS61280).
Contents
1 Introduction ................................................................................................................... 2
1.1 Requirements ....................................................................................................... 2
1.2 Applications.......................................................................................................... 2
1.3 Features.............................................................................................................. 2
2 TPS61280EVM Schematic ................................................................................................. 3
3 Connector and Test Point Descriptions................................................................................... 4
3.1 J1 Input Connectors................................................................................................ 4
3.2 J2 Output Connector ............................................................................................... 4
3.3 Other Connectors................................................................................................... 5
3.4 Jumpers.............................................................................................................. 5
4 TPS61280EVM Assembly Drawings and Layout........................................................................ 7
5 List of Materials .............................................................................................................. 9
List of Figures
1 TPS61280EVM-585 Schematic............................................................................................ 3
2 TPS61280EVM-585 Component Placement............................................................................. 7
3 TPS61280EVM-585 Top Copper .......................................................................................... 7
4 TPS61280EVM-585 Inner Layer 1 ........................................................................................ 8
5 TPS61280EVM-585 Inner Layer 2 ........................................................................................ 8
6 TPS61280EVM-585 Bottom Copper ...................................................................................... 8
7 Quick Connection Overview................................................................................................ 9
8 User Interface of TPS61280EVM-585................................................................................... 10
9 I²C Pull-Up Resistor Setting............................................................................................... 11
SLVU955A–December 2013–Revised June 2014 TPS61280-585 Evaluation Module
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Introduction
1 Introduction
The TPS61280 device provides a power-supply solution for products powered by either a three-cell
alkaline, NiCd or NiMH battery, or a single-cell Li-Ion or Li-polymer battery. The wide input voltage range
is ideal for portable power applications such as mobile phones or computer peripherals. In addition, the
TPS61280 can also maintain its output biased at the input voltage level. In this mode, the synchronous
rectifier is current-limited, and allows external loads (for example, an audio amplifier) to be powered with a
restricted supply. In this mode, quiescent current is reduced to 18 μA. Input current in shutdown mode is
less than 5 μA in order to maximize battery life.
1.1 Requirements
The TPS61280EVM is designed to operate over the full input voltage range and produces a fixed output
voltage.
In order to operate this EVM, only a dc power supply able to deliver between 2.3 V and 4.8 V is required.
1.2 Applications
• Single-Cell Ni-Rich, Si-Anode, Li-Ion, LiFePO4 smart-phones or tablet PCs
• 2.5G, 3G, and 4G mini-module data cards
• Current-limited applications featuring high peak power loads
1.3 Features
• 95% Efficiency at 2.3-MHz operation
• VINrange from 2.3 V to 4.8 V
• 2-μA quiescent current in low IQ pass-through mode
• Integrated pass-through mode (35 mΩ)
• Programmable valley inductor current limit and output voltage via I²C interface
• True pass-through mode during shutdown
• Thermal shutdown and overload protection
• Total solution size < 20 mm², sub 1-mm Profil
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1
2
3
J4
1
2
3
J3
1
2
J10
1
2
J11
1
2
3
J5
150uF
C1
VSELENABLE nBYP
GNDGND
VIN VIN
R1
R2
C12C11C10
1
2
3
J6
2.2k
R5
VIN
VIN
GND
GPIO/PG
VIN
S+
S-
GND
C2 C3 C4
GND
GND
GND
GNDGND GND GND
GND
VIN
5
4
1
2
3
6
J1
5
4
1
2
3
6
J2
VOUT
Ferrite Bead
L2
Ferrite Bead
L3
10µF
C6
10uF
C7 C8 C9
GND
ENABLE VSEL nBYP GPIO
GPIO
VSEL
ENABLE
nBYP
SDA
1
2
3
J7
1
2
3
J8
2.2kR32.2k
R4
VIN
I2C_CONNECTOR
GND
GND
1 2
3 4
5 6
7 8
9 10
J9
EN
A1
GPIO
A2
VIN
A3
VIN
A4
VSEL
B1
SCL
B2
VOUT
B3
VOUT
B4
BYP
C1
SDA
C2
SW
C3
SW
C4
AGND
D1
PGND
D2
PGND
D3
PGND
D4
U1
TPS61280YFF
SCL
SCL
SDA
1.5µF
C5
SW
470nH
L1
VOUT
S+
S-
GND
1 1 1
1
1
1 1
1
1
1 1 11 1
1
Not Installed
2.3V - 4.8V 2.85V - 4.4V
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2 TPS61280EVM Schematic
Figure 1 illustrates the TPS61280EVM schematic.
TPS61280EVM Schematic
SLVU955A–December 2013–Revised June 2014 TPS61280-585 Evaluation Module
Figure 1. TPS61280EVM-585 Schematic
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Connector and Test Point Descriptions
3 Connector and Test Point Descriptions
3.1 J1 Input Connectors
3.1.1 Pin 1 and 2: VIN
This header is the positive connection to the input power supply. The power supply must be connected
between these pins and pins 5 and 6 (GND). Twist the leads to the input supply and keep them as short
as possible. The input voltage must be between 2.3 V and 4.8 V.
3.1.2 Pin 3: Input Sense VIN
This header is intended to measure the input voltage directly on the input capacitor close to the device.
Therefore, a four-wire power and sense supply can be connected. Twist the leads to the sensing
connector.
Pin 4: Input Sense GND
This header is intended to measure the GND close to the input of the device. Therefore, a four-wire power
and sense supply can be connected. Twist the leads to the sensing connector.
3.1.3 Pin 5 and 6: GND
This header is the return connection to the input power supply. Connect the power supply between these
pins and pins 1 and 2 (VIN). Twist the leads to the input supply and keep them as short as possible. The
input voltage must be between 2.3 V and 4.8 V.
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3.2 J2 Output Connector
3.2.1 Pin 1 and 2: VOUT
This header is the positive connection of the output voltage. Connect the load between these pins and
pins 5 and 6 (GND).
3.2.2 Pin 3: Output Sense VOUT
This header is intended to measure the output voltage directly on the output capacitors.
3.2.3 Pin 4: Output Sense GND
This header is intended to measure the GND close to the output of the device.
Pin 5 and 6: GND
This is the return connection of the output voltage. Connect the load between these pins and Pin 1 and 2
(VOUT).
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3.3 Other Connectors
J9: I²C Connector
This 10-pin header connects the USB-to-GPIO adaptor to the TPS61280EVM-585.
J10: SMA Input Connector
This SMA connector is connected to the input voltage of the converter. It can be used to easily analyze
the noise spectrum of the input voltage with a spectrum analyzer. By default, J10 is not assembled on the
EVM.
3.3.1 J11: SMA Output Connector
This SMA connector is connected to the output voltage of the converter. It can be used to easily analyze
the noise spectrum of the output voltage with a spectrum analyzer. By default, J11 is not assembled on
the EVM.
3.4 Jumpers
3.4.1 J3: Enable Jumper
Placing a jumper across pins EN and ON ties the EN pin to VIN, and enables the device. Placing a jumper
across pins EN and OFF ties the EN pin to GND, which disables the device.
J4: VSEL, Output Voltage Selection
Placing a jumper across pins HIGH and VSEL ties the VSEL pin to VIN, and selects the default output roof
voltage. Placing a jumper across pins LOW and VSEL ties the VSEL pin to GND, and selects the default
output floor voltage.
Connector and Test Point Descriptions
Table 1. TPS61280 VSEL Settings
Value Description Default Output Voltage
HIGH Selects the Output Roof Voltage as stored in register 0x03 3.15 V
LOW Selects the Output Floor Voltage as stored in register 0x02 3.35 V
J5: nBYP, Forced Bypass Selection
Placing a jumper across pins nBYP and ON ties the nBYP pin to GND and enables the pass-through
mode. Placing a jumper across pins nBYP and OFF ties the nBYP pin to VIN and enables auto DC/DC
boost mode.
Table 2. TPS61280 Mode of Operations
EN Input nBYP Input Device Status
LOW LOW The device is shut down in pass-through mode featuring a shutdown current down to ca. 2 μA typ. The
LOW HIGH The device is shut down and the output voltage is reduced to a minimum value (VIN – VOUT ≤ 3.6 V).
HIGH LOW The device is active in forced pass-through mode. The device supply current is approximately 15 μA typ.
HIGH HIGH The device is active in auto mode (dc/dc boost, pass-through). The device supply current is approximately
load current capability is limited (up to ca. 250 mA).
The device shutdown current is approximately 8.5 μA typ.
from the battery. The device is short-circuit protected by a current limit of ca. 7300 mA.
50 μA typ. from the battery.
J6: GPIO/PG, General Purpose In/Out and Power Good
This pin can either be configured as a input (mode selection) or as dual role input/open-drain output
(nRST/nFAULT) pin. Per default, the pin is configured as nRST/nFAULT input/output.
Pin GPIO/PG is connected to HIGH per default. This pin is tied to VIN via pull-Up resistor R5.
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