MCP1640/B/C/D
0.65V Start-Up Synchronous Boost Regulator
with True Output Disconnect or Input/Output Bypass Option
Features General Description
Up to 96% Typical Efficiency The MCP1640/B/C/D is a compact, high-efficiency,
fixed frequency, synchronous step-up DC-DC con-
800 mA Typical Peak Input Current Limit:
verter. It provides an easy-to-use power supply solution
-I > 100 mA @ 1.2V V , 3.3V V
OUT IN OUT
for applications powered by either single-cell, two-cell,
-I > 350 mA @ 2.4V V , 3.3V V
OUT IN OUT
or three-cell alkaline, NiCd, NiMH, and single-cell Li-Ion
-I > 350 mA @ 3.3V V , 5.0V V
OUT IN OUT
or Li-Polymer batteries.
Low Start-Up Voltage: 0.65V, typical 3.3V V
OUT
Low-voltage technology allows the regulator to start-up
@ 1 mA
without high inrush current or output voltage overshoot
Low Operating Input Voltage: 0.35V, typical
from a low 0.65V input. High efficiency is accomplished
3.3V @ 1 mA
OUT
by integrating the low resistance N-Channel Boost
Adjustable Output Voltage Range: 2.0V to 5.5V
switch and synchronous P-Channel switch. All
Maximum Input Voltage V < 5.5V compensation and protection circuitry is integrated to
OUT
minimize the number of external components. For
Automatic PFM/PWM Operation (MCP1640/C):
standby applications, the MCP1640 consumes only
- PFM Operation Disabled (MCP1640B/D)
19 A while operating at no load, and provides a true
- PWM Operation: 500 kHz
disconnect from input to output while in Shutdown
Low Device Quiescent Current: 19 A, typical
(EN = GND). Additional device options are available by
PFM Mode (not switching)
operating in PWM-Only mode and connecting input to
Internal Synchronous Rectifier output while the device is in Shutdown.
Internal Compensation
The true load disconnect mode provides input-to-out-
Inrush Current Limiting and Internal Soft Start
put isolation while the device is disabled by removing
the normal boost regulator diode path from input-to-
Selectable, Logic Controlled Shutdown States:
output. The Input-to-Output Bypass mode option con-
- True Load Disconnect Option (MCP1640/B)
nects the input to the output using the integrated low
- Input to Output Bypass Option (MCP1640C/D)
resistance P-Channel MOSFET, which provides a low
Shutdown Current (All States): < 1 A
bias voltage for circuits operating in Deep Sleep mode.
Low Noise, Anti-Ringing Control
Both options consume less than 1 A of input current.
Overtemperature Protection
Output voltage is set by a small external resistor
Available Packages:
divider. Two package options are available, 6-Lead
SOT-23 and 8-Lead 2 x 3 mm DFN.
- 6-Lead SOT-23
- 8-Lead 2 x 3 mm DFN
Package Types
Applications
MCP1640 MCP1640
6-Lead SOT-23 8-Lead 2 x 3 DFN*
One, Two and Three Cell Alkaline and NiMH/NiCd
Portable Products
V
SW V 1 8 V
Single-Cell Li-Ion to 5V Converters 1 6 IN
FB IN
Li Coin Cell Powered Devices S 2 7 V
EP
V GND OUTS
GND 2 5
OUT
9
Personal Medical Products
P 3 6 V
GND OUTP
EN 3 V
4
FB
Wireless Sensors
EN SW
4 5
Handheld Instruments
GPS Receivers
* Includes Exposed Thermal Pad (EP); see Table 3-1.
Bluetooth Headsets
+3.3V to +5.0V Distributed Power Supply
2010-2015 Microchip Technology Inc. DS20002234D-page 1MCP1640/B/C/D
Typical Application
L
1
4.7 H
V
OUT
V
IN 3.3V @ 100 mA
SW
V
0.9V to 1.7V
OUT
V
IN
976 k
C
C
OUT
IN
+
V 10 F
4.7 F FB
EN
562 k
GND
-
L
1
4.7 H
V
OUT
V
IN 5.0V @ 300 mA
SW
V
3.0V to 4.2V
OUTS
V
IN
V
OUTP
976 k
C
C OUT
IN
+
V 10 F
4.7 F FB
EN
309 k
P
S
- GND
GND
Efficiency vs. I for 3.3V
OUT OUT
100.0
V = 2.5V
IN
80.0
V = 0.8V V = 1.2V
IN IN
60.0
40.0
0.1 1.0 10.0 100.0 1000.0
Output Current (mA)
DS20002234D-page 2 2010-2015 Microchip Technology Inc.
Efficiency (%)
ALKALINE
LI-ION