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MCP1624 Datasheet

Download or read online Microchip Technology MCP1624 Low-Voltage Input Boost Regulator For PIC®Microcontrollers pdf datasheet.



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Low-Voltage Input Boost Regulator
for PIC
Features:
• Up to 96% Typical Efficiency
• 425 mA Typical Peak Input Current Limit:
- I
> 50 mA @ 1.2V V
, 3.3V V
OUT
IN
- I
> 175 mA @ 2.4V V
, 3.3V V
OUT
IN
- I
> 175 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 (MCP1624)
• PWM-only Operation (MCP1623)
• 500 kHz PWM Frequency
• Low Device Quiescent Current: 19 µA, typical
PFM mode
• Internal Synchronous Rectifier
• Internal Compensation
• Inrush Current Limiting and Internal Soft-Start
• True Load Disconnect
• Shutdown Current (All States): < 1 µA
• Low Noise, Anti-Ringing Control
• Overtemperature Protection
• SOT-23-6 and 2 x 3 DFN-8 Package
Applications:
• One, Two and Three Cell Alkaline and NiMH/NiCd
®
Low-Power PIC
Microcontroller Applications
© 2011 Microchip Technology Inc.
MCP1623/24
®
Microcontrollers
General Description:
The MCP1623/24 is a compact, high-efficiency, fixed
frequency, synchronous step-up DC-DC converter. It
provides an easy-to-use power supply solution for PIC
OUT
microcontroller
OUT
one-cell, two-cell, or 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
applications, the MCP1624 operates and consumes
only 19 µA while operating at no load. The MCP1623
device option is available that operates in PWM-only
mode.
A “true” Load Disconnect mode provides input to output
isolation while disabled (EN = GND) by removing the
normal boost regulator diode path from input to output.
This mode consumes less than 1 µA of input current.
Output voltage is set by a small external resistor
divider.
Packaging
MCP1623/24
6-Lead SOT-23
SW
1
GND
2
EN
3
* Includes Exposed Thermal Pad (EP); see
applications
powered
by
either
external
components.
For
standby
MCP1623/24
2x3 DFN*
6 V
V
1
8
V
IN
FB
IN
S
2
7
V
EP
GND
OUTS
5 V
OUT
9
P
V
3
6
GND
OUTP
V
4
FB
EN
4
5 SW
Table
3-1.
DS41420C-page 1

Summary of Contents

Page 1

... N-Channel Boost switch and synchronous P-Channel switch. All compensation and protection circuitry are integrated to minimize applications, the MCP1624 operates and consumes only 19 µA while operating at no load. The MCP1623 device option is available that operates in PWM-only mode. A true Load Disconnect mode provides input to output isolation while disabled (EN GND) by removing the normal boost regulator diode path from input to output ...

Page 2

... MCP1623/ 0. 4.7 µF - MCP1623/24 Typical Application Circuit 100 0.01 MCP1624 Efficiency vs. I FIGURE 1: Typical Application. DS41420C-page 4.7 µH V OUT 3. OUT V IN 976 KΩ 562 KΩ GND V 0. (mA) OUT , V 3.3V OUT OUT OUT 10 µF ® ...

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 © 2011 Microchip Technology Inc. ...

Page 5

... OUTMAX 5.0V. OUT OUT MCP1623/24 3.3V mA 25°C. OUT LOAD 100 1000 I (mA) OUT MCP1624 Efficiency 0. 100 1000 I (mA) OUT MCP1624 Efficiency 1. 100 1000 I (mA) OUT MCP1624 Efficiency vs. DS41420C-page 5 ...

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 MCP1623 PWM Pulse . OUT © 2011 Microchip Technology Inc. ...

Page 7

... Current vs © 2011 Microchip Technology Inc 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. MCP1623/24 3.3V mA 25°C. OUT LOAD A MCP1624 3.3V V PFM OUT MCP1623 3.3V V OUT MCP1623/24 High Load DS41420C-page 7 ...

Page 8

... MCP1623/24 Note: Unless otherwise indicated 1.2V FIGURE 2-19: 3.3V Start-up After Enable. FIGURE 2-20: 3.3V Start-up when ENABLE FIGURE 2-21: MCP1624 3.3V V Transient Waveforms. DS41420C-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 MCP1623 3.3V V ...

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. 2x3 DFN 5 Switch Node, Boost Inductor Input Pin Ground Pin ...

Page 10

... There is one feature option for the MCP1623/24 family: PWM/PFM mode or PWM mode only. 4.1.1 PWM/PFM MODE OPTION The MCP1624 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 ...

Page 11

... LOGIC GND OSCILLATOR PWM/PFM LOGIC FIGURE 4-1: MCP1623/24 Block Diagram. © 2011 Microchip Technology Inc. During this time, the boost switch current is limited to 50% of its nominal value. Once the output voltage reaches 1.6V, normal closed-loop PWM operation is initiated. for PIC The MCP1623/24 charges an internal capacitor with a very weak current source ...

Page 12

... The peak current limit is set to 425 mA typical. 4.2.3 PFM MODE OPERATION The MCP1624 device is 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 13

... 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 14

... For a more accurate estimation of internal Size power dissipation, subtract the I WxLxH (mm) dissipation. 2.3x2.3x1.0 3.5x4.3x0.8 4.6x4.6x1.5 6.0x6.0x2.5 6.3x6.3x3.0 resistance, (θ ), the junction JA 5-3. OUT ( × ) – OUT OUT Dis , C and the inductor. IN OUT 2 L power INRMS ESR © 2011 Microchip Technology Inc. ...

Page 15

... When possible, ground planes and traces should be used to help shield the feedback signal and minimize noise and magnetic interference GND FIGURE 5-1: MCP1623/24 SOT-23-6 Recommended Layout. © 2011 Microchip Technology Inc. Via to GND Plane R R BOT MCP1623/24 ...

Page 16

... MCP1623/24 NOTES: DS41420C-page 16 © 2011 Microchip Technology Inc. ...

Page 17

... Package Marking Information (Not to Scale) 6-Lead SOT-23 XXNN MCP1623 MCP1624 8-Lead DFN XXX YWW NN MCP1623 MCP1624 Legend: XX...X Customer-specific information Y Year code (last digit of calendar year) YY Year code (last 2 digits of calendar year) WW Week code (week of January 1 is week 01) NNN ...

Page 18

... MCP1623/24 6-Lead Plastic Small Outline Transistor (CHY) [SOT-23] Note: Notes: DS41420C-page 18 I © 2011 Microchip Technology Inc. φ ...

Page 19

... Plastic Small Outline Transistor (CHY) [SOT-23] Note: © 2011 Microchip Technology Inc. MCP1623/24 DS41420C-page 19 ...

Page 20

... MCP1623/24 /HDG 3ODVWLF 'XDO )ODW 1R /HDG 3DFNDJH 0& ± [[ PP %RG >')1@ 1RWH 1RWHV DS41420C-page 20 © 2011 Microchip Technology Inc. ...

Page 21

... PP %RG >')1@ 1RWH © 2011 Microchip Technology Inc. MCP1623/24 DS41420C-page 21 ...

Page 22

... MCP1623/24 NOTES: DS41420C-page 22 © 2011 Microchip Technology Inc. ...

Page 23

... Updated the package marking information and drawings. 3. Updated the Product Identification System page. Revision B (July 2010) The following is the list of modifications: 1. Updated the packaging specification. Revision A (May 2010) Original Release of this Document. © 2011 Microchip Technology Inc. MCP1623/24 DS41420C-page 23 ...

Page 24

... MCP1623/24 NOTES: DS41420C-page 24 © 2011 Microchip Technology Inc. ...

Page 25

... Package a) MCP1623-I/CHY: b) MCP1623T-I/CHY: c) MCP1624-I/CHY: d) MCP1624T-I/CHY: e) MCP1623-I/MC: f) MCP1623T-I/MC: g) MCP1624-I/MC: h) MCP1624T-I/MC: MCP1623/24 . 0.65V, Sync Reg., 6LD SOT-23 package Tape and Reel, 0.65V, Sync Reg., 6LD SOT-23 package 0.65V, Sync Reg., 6LD SOT-23 package Tape and Reel, 0.65V, Sync Reg., 6LD SOT-23 package 0 ...

Page 26

... MCP1623/24 NOTES: DS41420C-page 26 © 2011 Microchip Technology Inc. ...

Page 27

... 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 28

... 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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