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MCP1640T-ICHY Datasheet(PDF) 15 Page - Microchip Technology

Part No. MCP1640T-ICHY
Description  0.65V Start-Up Synchronous Boost Regulator with True Output Disconnect or Input/Output Bypass Option
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP1640T-ICHY Datasheet(HTML) 15 Page - Microchip Technology

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 2010-2015 Microchip Technology Inc.
DS20002234D-page 15
MCP1640/B/C/D
5.0
APPLICATION INFORMATION
5.1
Typical Applications
The MCP1640/B/C/D synchronous boost regulator
operates over a wide input and output voltage range.
The power efficiency is high for several decades of load
range. Output current capability increases with input
voltage and decreases with increasing output voltage.
The maximum output current is based on the
N-Channel peak current limit. Typical characterization
curves in this data sheet are presented to display the
typical output current capability.
5.2
Adjustable Output Voltage
Calculations and
Maximum Output Current
To calculate the resistor divider values for the
MCP1640/B/C/D, the following equation can be used,
where RTOP is connected to VOUT, RBOT is connected
to GND and both are connected to the FB input pin.
EQUATION 5-1:
EXAMPLE 1:
EXAMPLE 2:
The internal error amplifier is of transconductance type; its
gain is not related to the resistors' value. There are some
potential issues with higher-value resistors. For small
surface-mount resistors, environment contamination can
create leakage paths that significantly change the resistor
divider ratio and modify the output voltage tolerance.
Smaller feedback resistor values will increase the
current drained from the battery by a few µA, but will
result in good regulation over the entire temperature
range and environment conditions. The feedback input
leakage current can also impact the divider and change
the output voltage tolerance.
For boost converters, the removal of the feedback
resistors during operation must be avoided. In this
case, the output voltage will increase above the
absolute maximum output limits of the MCP1640/B/C/D
and damage the device.
The maximum device output current is dependent upon
the input and output voltage. For example, to ensure a
100 mA load current for VOUT = 3.3V, a minimum of
1.0-1.1V input voltage is necessary. If an application is
powered by one Li-Ion battery (VIN from 3.0V to 4.2V),
the minimum load current the MCP1640/B/C/D can
deliver is close to 300 mA at 5.0V output and a
maximum of 500 mA (Figure 2-3).
5.2.1
VIN >VOUT SITUATION
For VIN >VOUT, the output voltage will not remain in
regulation. VIN >VOUT is an unusual situation for a
boost converter, and there is a common issue when
two Alkaline cells (2 x 1.6V typical) are used to boost to
3.0V output. The Input-to-Output Bypass option is
recommended to be used in this situation until the
batteries’ voltages go down to a safe headroom. A
minimum headroom of approximately 150 to 200 mV
between VOUT and VIN must be ensured, unless a low-
frequency, high-amplitude output ripple on VOUT is
expected. The ripple and its frequency is VIN and load
dependent. The higher the VIN, the higher the ripple
and the lower its frequency.
5.3
Input Capacitor Selection
The boost input current is smoothed by the boost induc-
tor reducing the amount of filtering necessary at the
input. Some capacitance is recommended to provide
decoupling from the source. Low ESR X5R or X7R are
well suited since they have a low temperature coefficient
and small size. For most applications, 4.7 µF of capaci-
tance is sufficient at the input. For high-power applica-
tions that have high source impedance or long leads,
connecting the battery to the input 10 µF of capacitance
is recommended. Additional input capacitance can be
added to provide a stable input voltage.
Table 5-1 contains the recommended range for the
input capacitor value.
5.4
Output Capacitor Selection
The output capacitor helps provide a stable output
voltage during sudden load transients and reduces the
output voltage ripple. As with the input capacitor, X5R
and X7R ceramic capacitors are well suited for this appli-
cation. Using other capacitor types (aluminum or tanta-
lum) with large ESR has an impact on the converter's
efficiency and maximum output power (see AN1337).
VOUT =3.3V
VFB =1.21V
RBOT = 309 k
RTOP = 533.7 k (Standard Value = 536 k)
VOUT =5.0V
VFB = 1.21V
RBOT =309 k
RTOP =967.9 k (Standard Value = 976 k)
R
TOP
R
BOT
V
OUT
V
FB
----------------
1



=


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