MCP16251 AND MCP1640B
SYNCHRONOUS BOOST CONVERTERS
EVALUATION BOARD USER’S GUIDE
2013 Microchip Technology Inc. DS50002110B-page 11
Chapter 1. Product Overview
1.1 INTRODUCTION
The MCP16251 and MCP1640B devices are compact, high-efficiency, fixed frequency,
step-up DC-DC converters. These products provide an easy-to-use power supply
solution, with a minimum number of external components for applications powered by
one-cell, two-cell, or three-cell alkaline, NiCd, NiMH, one-cell Li-Ion or Li-Polymer
batteries.
The MCP16251 automatically selects the best operating mode for efficiency,
pulse-width modulation (PWM) or pulse frequency (PFM). The device has a very low
quiescent current 4 µA (not switching, measured at output), a wide input voltage range
(0.35 to 5.5V) and a low start-up voltage (0.82V) at 1 mA load current.
The MCP1640B is a PWM-only controller, with a typical of 19 µA quiescent current (not
switching, measured at output), a wide input voltage range (0.35V to 5.5V) and a
start-up voltage of 0.65V at 1 mA load current.
The major differences between the two device families (MCP16251/2 and
MCP1640/B/C/D) are the very low quiescent current for the MCP16251/2, and the
voltage reference (1.21V for the MCP1640/B/C/D, 1.23V for the MCP16251/2,
respectively).
The available package types for these devices are: SOT-23-6 and 2x3 mm (T)DFN-8.
The scope of this evaluation board is to demonstrate the low quiescent current for the
PWM/PFM MCP16251 device, and the low-noise output for the MCP1640B PWM-only
option.
This chapter provides an overview of the MCP16251 and MCP1640B Synchronous
Boost Converters Evaluation Board, and covers the following topics:
• What is the MCP16251 and MCP1640B Synchronous Boost Converters Evalua-
tion Board?
• What the MCP16251 and MCP1640B Synchronous Boost Converters Evaluation
Board Contains
FIGURE 1-1: Typical MCP16251 Boost Converter Single-Cell Battery Input.
V
IN
EN
GND
V
FB
SW
V
IN
0.9V to 1.7V
V
OUT
3.3V @ 75 mA
C
OUT
10 µF
C
IN
4.7 µF
L
1
4.7 µH
V
OUT
+
-
1.69 M
1M
Alkaline
