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MCP1640C Datasheet

Download or read online Microchip Technology MCP1640C 0.65V Start-Up Synchronous Boost Regulator With True Output Disconnect Or Input/Output Bypass Option pdf datasheet.



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0.65V Start-up Synchronous Boost Regulator with True
Output Disconnect or Input/Output Bypass Option
Features
• Up to 96% Typical Efficiency
• 800 mA Typical Peak Input Current Limit:
- I
> 100 mA @ 1.2V V
, 3.3V V
OUT
IN
- I
> 350 mA @ 2.4V V
, 3.3V V
OUT
IN
- I
> 350 mA @ 3.3V V
, 5.0V V
OUT
IN
• Low Start-up Voltage: 0.65V, typical 3.3V V
@ 1 mA
• Low Operating Input Voltage: 0.35V, typical
3.3V
@ 1 mA
OUT
• Adjustable Output Voltage Range: 2.0V to 5.5V
• Maximum Input Voltage  V
< 5.5V
OUT
• Automatic PFM/PWM Operation (MCP1640C):
- PFM Operation Disabled (MCP1640B/D)
- PWM Operation: 500 kHz
• Low Device Quiescent Current: 19 µA, typical
PFM Mode
• Internal Synchronous Rectifier
• Internal Compensation
• Inrush Current Limiting and Internal Soft-Start
• Selectable, Logic Controlled, Shutdown States:
- True Load Disconnect Option (MCP1640B)
- Input to Output Bypass Option (MCP1640C/D)
• Shutdown Current (All States): < 1 µA
• Low Noise, Anti-Ringing Control
• Overtemperature Protection
• Available Packages:
- 6-Lead SOT23
- 8-Lead 2x3 DFN
Applications
• One, Two and Three Cell Alkaline and NiMH/NiCd
Portable Products
• Single Cell Li-Ion to 5V Converters
• Li Coin Cell Powered Devices
• Personal Medical Products
• Wireless Sensors
• Handheld Instruments
• GPS Receivers
• Bluetooth Headsets
• +3.3V to +5.0V Distributed Power Supply
 2011 Microchip Technology Inc.
MCP1640/B/C/D
General Description
The MCP1640/B/C/D is a compact, high-efficiency,
fixed frequency, synchronous step-up DC-DC con-
verter. It provides an easy-to-use power supply solution
OUT
for applications powered by either one-cell, two-cell, or
OUT
three-cell alkaline, NiCd, NiMH, one-cell Li-Ion or
Li-Polymer batteries.
OUT
OUT
Low-voltage technology allows the regulator to start up
without high inrush current or output voltage overshoot
from a low 0.65V input. High efficiency is accomplished
by integrating the low resistance N-Channel Boost
switch and synchronous P-Channel switch. All
compensation and protection circuitry are integrated to
minimize
external
applications, the MCP1640 operates and consumes
only 19 µA while operating at no load, and provides a
true disconnect from input to output while shut down
(EN = GND). Additional device options are available
that operate in PWM-only mode and connect input to
output bypass while shut down.
A “true” load disconnect mode provides input to output
isolation while disabled by removing the normal boost
regulator diode path from input to output. A Bypass
mode option connects the input to the output using the
integrated low resistance P-Channel MOSFET, which
provides a low bias keep-alive voltage for circuits
operating in Deep Sleep mode. Both options consume
less than 1 µA of input current.
Output voltage is set by a small external resistor
divider. Two package options are available, 6-Lead
SOT23 and 8-Lead 2x3 DFN.
Package Types
MCP1640
6-Lead SOT23
SW
1
GND
2
3
EN
* Includes Exposed Thermal Pad (EP); see
components.
For
standby
MCP1640
8-Lead 2x3 DFN*
6 V
V
1
8
V
IN
FB
IN
S
V
2
7
EP
5 V
GND
OUTS
OUT
9
P
3
6
V
GND
OUTP
V
4
FB
EN
5 SW
4
Table
3-1.
DS22234B-page 1

Summary of Contents

Page 1

... Internal Compensation Inrush Current Limiting and Internal Soft-Start Selectable, Logic Controlled, Shutdown States: - True Load Disconnect Option (MCP1640B) - Input to Output Bypass Option (MCP1640C/D) Shutdown Current (All States): < 1 µA Low Noise, Anti-Ringing Control Overtemperature Protection • ...

Page 2

... SW V OUTS OUTP 976 K 309 K GND GND for 3.3V OUT OUT V 0.8V IN 1.0 10.0 100.0 Output Current (mA) V OUT 3.3V @ 100 mA C OUT µ OUT 5.0V @ 300 mA C OUT µ 2. 1.2V IN 1000.0 2011 Microchip Technology Inc. ...

Page 3

... OUT 5: Peak current limit determined by characterization, not production tested. 2011 Microchip Technology Inc. Notice: Stresses above those listed under Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of ...

Page 4

... OUT kHz %of V OUT %of V OUT IN µ µS EN Low to High, 90 Note 4 OUT C C quiescent current can be IN Units Conditions ° C Steady State ° C ° C Transient ° C/W EIA/JESD51-3 Standard ° C/W 2011 Microchip Technology Inc. ...

Page 5

... Temperature in PWM Mode. 600 V OUT 500 V 3.3V OUT 400 V 2.0V 300 OUT 200 100 0 0 0.5 1 1.5 2 2.5 3 3.5 V (V) IN FIGURE 2-3: Maximum I OUT 2011 Microchip Technology Inc µ 4.7 µH, V OUT IN 100 3.3V OUT 0. FIGURE 2-4: Mode Efficiency vs. I 100 90 5.0V 80 ...

Page 6

... I (mA) OUT Minimum Start-up and into Resistive Load vs OUT V 3.3V OUT - Ambient Temperature (° vs. Ambient OSC V 5.0V OUT V 3.3V OUT V 2.0V OUT (mA) OUT PWM Pulse Skipping Mode . OUT 2011 Microchip Technology Inc. 10 ...

Page 7

... OUT 3. 2.0V OUT OUT 0.5 1 1.5 2 2.5 V (V) IN FIGURE 2-15: PFM / PWM Threshold Current vs 2011 Microchip Technology Inc. MCP1640/B/C µ 4.7 µH, V OUT 5.0V OUT 3. 5.0V OUT 2.9 3.2 3.5 FIGURE 2-16: Mode Waveforms. 4 4.5 5 FIGURE 2-17: PWM Mode Waveforms 5.0V OUT 3 3.5 4 FIGURE 2-18: Waveforms ...

Page 8

... Start-up when ENABLE FIGURE 2-21: MCP1640 3.3V V Transient Waveforms. DS22234B-page µ 4.7 µH, V OUT IN OUT FIGURE 2-22: Transient Waveforms. FIGURE 2-23: IN Transient Waveforms. Load FIGURE 2-24: OUT Waveforms. 3.3V mA 25° C. LOAD A MCP1640B 3.3V V Load OUT MCP1640B 2.0V V Load OUT 3.3V V Line Transient OUT 2011 Microchip Technology Inc. ...

Page 9

... Output Voltage Pin (V OUT The output voltage pin connects the integrated P-Channel MOSFET to the output capacitor. The FB voltage divider is also connected to the V voltage regulation. 2011 Microchip Technology Inc. Table 3-1. 5 Switch Node, Boost Inductor Input Pin Ground Pin 4 ...

Page 10

... MCP1640/B/C/D NOTES: DS22234B-page 10 2011 Microchip Technology Inc. ...

Page 11

... Output Disconnect mode or Input Bypass mode 4.1.1 PWM/PFM MODE OPTION The MCP1640C devices use an automatic switchover from PWM to PFM mode for light load conditions to maximize efficiency over a wide range of output current. During PFM mode, higher peak current is used to pump the output up to the threshold limit. While ...

Page 12

... There is no undervoltage lockout feature for the MCP1640/B/C/D. The device will start up at the lowest possible voltage and run down to the lowest possible voltage. For typical battery applications, this may result in motor-boating (emitting a low-frequency tone) for deeply discharged batteries. 2011 Microchip Technology Inc. FB ...

Page 13

... The peak current limit is set to 800 mA typical. 4.2.3 PFM MODE OPERATION The MCP1640C devices are capable of operating in normal PWM mode and PFM mode to maintain high efficiency at all loads. In PFM mode, the output ripple has a variable frequency component that changes with the input voltage and output current ...

Page 14

... MCP1640/B/C/D NOTES: DS22234B-page 14 2011 Microchip Technology Inc. ...

Page 15

... The FB input leakage current can also impact the divider and change the output voltage tolerance. 2011 Microchip Technology Inc. 5.3 Input Capacitor Selection The boost input current is smoothed by the boost inductor reducing the amount of filtering necessary at the input ...

Page 16

... Therefore it is important that the input 6.3x6.3x3.0 and output capacitors be placed as close as possible to the MCP1640/B/C/D to minimize the loop area. ), the junction temperature 5-3. OUT  OUT OUT Dis , C and the IN OUT 2 L power INRMS ESR 2011 Microchip Technology Inc. ...

Page 17

... IN GND FIGURE 5-1: MCP1640/B/C/D SOT23-6 Recommended Layout GND FIGURE 5-2: MCP1640/B/C/D DFN-8 Recommended Layout. 2011 Microchip Technology Inc. MCP1640/B/C/D Via to GND Plane R R BOT MCP1640 1 Via for Enable L MCP1640 ...

Page 18

... MCP1640/B/C/D NOTES: DS22234B-page 18 2011 Microchip Technology Inc. ...

Page 19

... Normal Run mode, the MCP1640C device provides input to out- put bypass when disabled. The PIC One of its I/O pins is used to enable and disable the MCP1640C to control its bias voltage. While operating in Sleep mode, the MCP1640C input quiescent current is typically less than 1 uA. ...

Page 20

... MCP1640/B/C/D NOTES: DS22234B-page 20 2011 Microchip Technology Inc. ...

Page 21

... Microchip Technology Inc. MCP1640/B/C/D Example BZNN Package Marking BZNN MCP1640C BXNN BWNN MCP1640D BYNN Example AHM 945 25 Package Marking AHM MCP1640C AHQ AHP MCP1640D AHR ) e 3 DS22234B-page 21 ...

Page 22

... MCP1640/B/C/D /HDG 3ODVWLF 6PDOO 2XWOLQH 7UDQVLVWRU & >627@ 1RWH N PIN LASER MARK 1RWHV DS22234B-page φ 2011 Microchip Technology Inc. ...

Page 23

... Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging 2011 Microchip Technology Inc. MCP1640/B/C/D DS22234B-page 23 ...

Page 24

... MCP1640/B/C/D /HDG 3ODVWLF 'XDO )ODW 1R /HDG 3DFNDJH 0& ± [[ PP %RG >')1@ 1RWH NOTE TOP VIEW A3 1RWHV DS22234B-page EXPOSED PAD BOTTOM VIEW A NOTE NOTE 2011 Microchip Technology Inc. ...

Page 25

... Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging 2011 Microchip Technology Inc. MCP1640/B/C/D DS22234B-page 25 ...

Page 26

... MCP1640/B/C/D NOTES: DS22234B-page 26 2011 Microchip Technology Inc. ...

Page 27

... APPENDIX A: REVISION HISTORY Revision B (March 2011) The following is the list of modifications: 1. Updated Table 5-2. 2. Added the package markings Section 7.0 Packaging Information. Revision A (February 2010) Original release of this document. 2011 Microchip Technology Inc. MCP1640/B/C/D tables in DS22234B-page 27 ...

Page 28

... MCP1640/B/C/D NOTES: DS22234B-page 28 2011 Microchip Technology Inc. ...

Page 29

... MCP1640B: 0.65V, PWM Only True Disconnect, Sync Boost Regulator MCP1640BT: 0.65V, PWM Only True Disconnect, Sync Boost Regulator (Tape and Reel) MCP1640C: 0.65V, PWM/PFM Input to Output Bypass, Sync Boost Regulator MCP1640CT: 0.65V, PWM/PFM Input to Output Bypass, Sync Boost Regulator (Tape and Reel) MCP1640D: 0 ...

Page 30

... MCP1640/B/C/D NOTES: DS22234B-page 30 2011 Microchip Technology Inc. ...

Page 31

... PICtail, REAL ICE, rfLAB, Select Mode, Total Endurance, TSHARC, UniWinDriver, WiperLock and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. © 2011, Microchip Technology Incorporated, Printed in the U ...

Page 32

... Singapore Tel: 65-6334-8870 Fax: 65-6334-8850 Taiwan - Hsin Chu Tel: 886-3-6578-300 Fax: 886-3-6578-370 Taiwan - Kaohsiung Tel: 886-7-213-7830 Fax: 886-7-330-9305 Taiwan - Taipei Tel: 886-2-2500-6610 Fax: 886-2-2508-0102 Thailand - Bangkok Tel: 66-2-694-1351 Fax: 66-2-694-1350 2011 Microchip Technology Inc. 02/18/11 ...

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