Texas Instruments TPS61220EVM-319, User Manual

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1 Introduction
1.1 Related Documentation From Texas Instruments
2 Setup
2.1 J1/J3 – Input Connections
User's Guide
SLVU253 – February 2009
TPS61220EVM-319
This user’s guide describes the characteristics, operation, and use of the TPS61220EVM-319 evaluation
module (EVM). This EVM demonstrates the Texas Instruments TPS61220 synchronous boost converter.
The input voltage range of the TPS61220 is 0.7 V to 5.5 V, allowing the device to operate from one-cell to
three-cell battery configurations in addition to a single-cell Li-ion battery. This user’s guide includes setup
instructions, schematic diagram, bill of materials, and printed-circuit board layout drawings for the EVM.
The TPS61220EVM-319 evaluation module (EVM) helps designers evaluate the operation and
performance of the TPS61220 boost converter. The TPS61220 is an adjustable output version that can be
set between 1.8 V and 5.5 V. The output of this EVM is set to 3.3 V out. The output voltage can be
changed between 1.8 V and 5.5 V by adjusting the value of R1 and R2. See
Table 1 for common output
voltages and recommended values for R1 and R2; also see data sheet ( SLVS776 ) for more information.
The board features the small, 6-pin SC-70 package (DCK) for a small solution size.
Also available are the fixed output version of the device. The fixed version can be installed and evaluated
on this board by removing R2 and replacing R1 with a 0-
Ω
resistor or jumper wire. The inductor and
capacitors are satisfactory for the fixed version also and do not require replacement.
Table 1. Changing Output Voltage With R1 and R2
Vout (V) R1 (k
Ω
) R2 (k
Ω
)
5 1000 110
4.2 1000 137
3.6 1000 162
3.3 1000 178
3 1000 200
2.5 1000 249
2 499 165
1.8 499 191
TPS61220, Low Input Voltage Step-Up Converter in 6 Pin SC-70 Package data sheet ( SLVS776 )
This section describes the jumpers and connectors on the EVM as well as how to properly connect, set
up, and use the TPS61220EVM-319.
This is the connection for the leads from the input source. Connect the positive connection to the Vin J1
and the negative connection to the GND J3.
SLVU253 – February 2009 TPS61220EVM-319 1
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