MCP16413 datasheet(19/44 Pages) MICROCHIP

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DS20006394D-page 19

MCP1641X

5.0

DEVICE OVERVIEW

5.1

Introduction

The MCP1641X is a low-voltage, step-up converter with

battery monitoring features. The MCP1641X delivers

high efficiency over a wide range of inputs: single-cell,

two-cell, alkaline/NiMH batteries or single-cell

Li-Ion/Li-Polymer batteries can be used.

A high level of integration lowers total system cost,

eases implementation and reduces the Bill of Materials

(BOM) and board area.

This family of devices features low quiescent current, a

programmable start-up voltage (UVLOSTART), low battery

indication, adjustable output voltage, dual modes of

operation (PFM/PWM and PWM Only), integrated

synchronous switch, internal compensation, low noise

anti-ringing control, inrush current limit and soft start.

A new battery-friendly feature for the Microchip’s step-up

converters family is the Automatic Input-to-Output

Voltage Bypass. This function helps optimize the capacity

usage of the battery, and keeps the efficiency high and

the noise low for a narrow step-up conversion ratio (e.g.,

two fresh alkaline cells powering a boost converter for a

3.0V or 3.3V output voltage). With automatic transition

from Input-to-Output Bypass to Boost mode operation

and low noise anti-ringing control circuitry, in addition to

the PWM Only switching, the MCP1641X devices offer a

good low noise DC-DC solution for compact

battery-powered systems.

The monitoring of its internal temperature, while

powering the converter from batteries, is an additional

safety feature of the MCP1641X family. An output pin

(PGT) provides an error signal if the temperature of the

die exceeds +75

C.

There are two shutdown options for the MCP1641X

family: Output Discharge and Input-to-Output Bypass.

5.2

MCP1641X Options

A summary of the device options is presented in

Table 3-1.

5.2.1

PFM/PWM OPERATION

The MCP16411/3/5/7 devices use an automatic

switchover from PWM to PFM mode, for light load

conditions, to maximize efficiency over a wide range of

output current.

The PFM mode operation has a higher output voltage

ripple and variable frequency as compared to the PWM

mode.

5.2.2

PWM ONLY OPERATION

During periods of light load operation, the MCP1641X

devices continue to operate at a fixed 500 kHz

switching frequency, allowing pulse-skipping.

The MCP16412/4/6/8 devices disable PFM mode

switching and operate only in PWM mode over the

entire load range.

5.2.3

OUTPUT DISCHARGE SHUTDOWN

OPTION

The MCP16411/2/5/6 devices incorporate an output

auto-discharge feature. While in Shutdown mode, the

MCP16411/2/5/6 devices automatically discharge the

output capacitor by using an internal N-Channel

MOSFET switch.

The capacitors connected to the output are discharged

by an integrated switch of 150-200Ω. The discharge

time depends on the total output capacitance.

During the Output Discharge Shutdown mode, the

output

the

MCP16411/2/5/6

completely

disconnected from the input by turning off the

integrated P-Channel switch and removing the switch

bulk diode connection. This removes the DC path,

which is typically present in boost converters and which

allows the output to be disconnected from the input.

While in this mode, a low quiescent current (2.3 µA,

typical) is consumed from the input (battery).

5.2.4

INPUT-TO-OUTPUT BYPASS

SHUTDOWN OPTION

The

MCP16413/4/7/8

devices

incorporate

the

Input-to-Output Bypass Shutdown option. With the EN

input pulled low, the output is connected to the input

using the internal P-Channel MOSFET.

In this mode, the current drawn from the input (battery)

is 2.3 μA, typically, with no load. The Input-to-Output

Bypass mode is used when the input voltage range is

high enough for the load to operate in Standby or Low

IQ mode (e.g., a microcontroller). When a higher,

regulated output voltage is necessary to operate the

application, the EN input is pulled high, boosting the

output to the regulated value.

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