MCP16251_16 datasheet(14/32 Pages) MICROCHIP

Part #	MCP16251

Description	Low Quiescent Current, PFM/PWM Synchronous Boost Regulator with True Output Disconnect or Input/Output Bypass Option

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14 / 32 page

MCP16251/2

DS20005173B-page 14

 2013 - 2016 Microchip Technology Inc.

5.0

APPLICATION INFORMATION

5.1

Typical Applications

The

MCP16251/2

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 the

input voltage and decreases with the 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

To calculate the resistor divider values for the

MCP16251/2, use Equation 5-1, where RTOP is

connected to VOUT, RBOT is connected to GND and

both are connected to the VFB input pin.

EQUATION 5-1:

EXAMPLE 1:

EXAMPLE 2:

EXAMPLE 3:

The internal error amplifier is a transconductance type,

i.e., its gain is not related to the resistors’ value. There

are some potential issues with higher value resistors.

For small surface mount resistors, environment con-

tamination can create leakage paths that significantly

change the resistor divider ratio and change the output

voltage tolerance. Designers should use resistors that

are larger than 1 M

 with precaution; they can be used

on limited temperature range (-20 to +85oC). For a

lower temperature (down to -40oC), resistors from

Examples 1 or 2 should be calculated as follows:

EXAMPLE 4:

EXAMPLE 5:

Smaller feedback resistor values will increase the

quiescent current drained from the battery by a few µA,

but will result in good regulation over the entire

temperature range.

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 MCP16251/2

and damage the device (for additional information, see

Application Note AN1337, “Optimizing Battery Life in

DC Boost Converters Using MCP1640”, DS01337.

5.3

Input Capacitor Selection

The boost input current is smoothed by the boost

inductor, 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 capacitance is sufficient at the input. For

high-power

applications

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.

Refer to Table 5-1 for the recommended range of the

input capacitor value.

VOUT = 2.0V

VFB = 1.23V

RBOT = 1 M

RTOP = 626.01 kwith a standard value of

620 k

, V

OUT is 1.992V)

VOUT = 3.3V

VFB = 1.23V

RBOT = 1 M

RTOP = 1.68 Mwith a standard value of

1.69 M

 V

OUT is 3.308V)

VOUT = 5.0V

VFB = 1.23V

RBOT = 1 M

RTOP = 3.065 M (with a standard value of

3.09 M

 V

OUT is 5.03V)

R

TOP

R

BOT

V

OUT

V

FB

-------------1

–







=

VOUT = 2.0V

VFB = 1.23V

RBOT = 309 k

RTOP = 193.44 kwith a standard value of

191 k

 V

OUT is 1.99V)

VOUT = 3.3V

VFB = 1.23V

RBOT = 309 k

RTOP = 520.024 kwith a standard value of

523 k

 V

OUT is 3.311V)

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