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ADM00458

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22
MCP16251 AND MCP1640B
SYNCHRONOUS BOOST CONVERTERS
EVALUATION BOARD USER’S GUIDE
2013 Microchip Technology Inc. DS50002110B-page 13
Chapter 2. Installation and Operation
2.1 INTRODUCTION
The MCP1640B is capable of regulating the output voltage over a wide 2.0V to 5.5V
range, and typically can deliver over 100 mA of load current at 3.3V output when
supplied from a single 1.2V cell. The input voltage range is 0.35V to 5.5V with a low
0.65V start-up voltage. The regulated output voltage (V
OUT
) should be greater than or
equal to the input voltage (V
IN
). In particular, the MCP1640B is PWM-only with True
Disconnect shutdown option.
The MCP16251 can regulate the output voltage over a 1.8V to 5.5V range, and can
deliver a minimum of 75 mA of load current at 3.3V V
OUT
when supplied from a one
alkaline battery. Compared to the MCP1640B, the MCP16251 has both pulse-width
modulation (PWM) and pulse frequency modulation (PFM) operating modes, and
automatically selects the best operating mode for efficiency.
FIGURE 2-1: Synchronous Boost Application for SOT-23-6 package type.
When disabled, the True Disconnect option removes the normal boost topology path
from input to output by opening the diode path, using a P-Channel synchronous switch
with a reversible body diode.
EN Switch
V
OUT
SEL
V
OUT
GND
L
1
4,7 µH
GND
V
IN
C
1
C
2
U
1
10 µF
10 µF
5
RT
1
RT
2
V
OUT1
V
OUT2
GND
EN
FB
SW
V
IN
V
OUT
1
2
3
6
4
_
+
+
_
RB
1
Note: Calculate R
T
resistors for a particular V
OUT
as:
V
FB
= 1.23V (for MCP16251)
V
FB
= 1.21V (for MCP1640B)
R
T
R
B
V
OUT
V
FB
------------- 1–


=
MCP16251 and MCP1640B Synchronous Boost Converters Evaluation Board User’s Guide
DS50002110B-page 14 2013 Microchip Technology Inc.
The MCP16251 and MCP1640B Synchronous Boost Converters Evaluation Board
offers both package types in two boost-converter applications for 2.0V, 3.3V and 5.0V
output voltage options that can be selected using a mini-dip switch. The enable input
is controlled in both boost converter applications using a mini-dip switch.
2.2 BOARD FEATURES
The MCP16251 and MCP1640B Synchronous Boost Converters Evaluation Board has
the following features:
• It can be powered by one-cell, two-cell, or three-cell alkaline, NiCd, NiMH,
one-cell Li-Ion or Li-Polymer batteries
• Input voltage range (V
IN
): 0.35V to 5.5V, with V
IN
V
OUT
• Fixed output voltage: 2.0V or 3.3V and 3.3V or 5.0V, selected using a mini-dip
switch on board
• Output current: typical 125 mA @ 3.3V Output, 1.5V Input or 200 mA @ 5.0V
Output, 3V Input
• Start-up voltage: 0.82V (for MCP16251’s Converter) or 0.65V (for MCP1640B’s
Converter) at V
OUT
= 3.3V and I
OUT
= 1mA, resistive load
• Automatic PFM/PWM Operation for the MCP16251 Converter
• PWM Switching Frequency = 500 kHz
• Enable state, selectable using the mini-dip switch on board
• Peak Input Current Limit (800mA for MCP1640 or 650mA for MCP16251)
• Overtemperature Protection
2.3 GETTING STARTED
The MCP16251 and MCP1640B Synchronous Boost Converters Evaluation Board is
fully assembled and tested to evaluate and demonstrate the MCP16251 and the
MCP1640B products. This board requires the use of external lab supplies and load.
2.3.1 Power Input and Output Connection
2.3.1.1 POWERING THE MCP16251 AND MCP1640B SYNCHRONOUS BOOST
CONVERTERS EVALUATION BOARD
Soldered test points are available for input voltage connections. The maximum input
voltage should not exceed 6.0V. The output voltage will not remain in regulation for
input voltages that are greater than or equal to the output voltage.
The MCP16251 and MCP1640B Synchronous Boost Converters Evaluation Board has
two independent circuit applications, one using the MCP16251 SOT-23-6 package,
while the other uses the MCP1640B DFN-8 package. The SOT-23-6 package has two
output voltage settings (2.0V and 3.3V) selectable by an on-board mini-dip switch. The
DFN-8 package has two output voltage settings (3.3V and 5.0V), also selectable by an
on-board mini-dip switch.
Soldered test points are available to connect a load. The switch peak current limit will
provide a safe maximum current value. The maximum output current for the converters
will vary with input and output voltages; refer to the MCP16251/2 and MCP1640/B/C/D
data sheets for more information on the maximum output current.
Installation and Operation
2013 Microchip Technology Inc. DS50002110B-page 15
2.3.1.2 BOARD POWER-UP PROCEDURE
1. Connect system load to V
OUT
and GND terminals; maximum load varies with
input and output voltage (see the MCP16251/2 and MCP1640/B/C/D data sheets
for more information on the maximum load). Connect the (+) side of the load to
V
OUT
and the negative (-) load to ground (GND).
2. Set the desired output voltage using the V
OUT
SEL mini-dip switch.
3. Turn the device ON/OFF using the EN mini-dip switch.
4. When EN is set ON or high, the converter is enabled and V
OUT
can be measured
on the V
OUT
and GND terminals. When EN is low, the converter is disabled and
V
OUT
is floating, and disconnected from the input.
Capacitors C
3
, C
4
, C
6
and C
7
are not populated. The component pads are provided for
experimental use.
FIGURE 2-2: MCP16251 and MCP1640B Synchronous Boost Converters Evaluation Board Setup.
A-meter
A-meter
V-meter
1.2V Cell
Resistive
(100Ω/1W)
V
OUT
SEL switch
between 2 and 3.3V
V-meter
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22

ADM00458

Mfr. #:
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Manufacturer:
Microchip Technology
Description:
Power Management IC Development Tools MCP16251 & MCP1640B Sync Boost Converters Eval Board
Lifecycle:
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