Datasheet

ManualsBrandsMicrochip ManualsDC / DC ControllersSwitching regulator SOT-23 2-5.5 V 1 A

 2010 Microchip Technology Inc. DS22234A-page 1

MCP1640/B/C/D

Features

• Up to 96% Typical Efficiency

• 800 mA Typical Peak Input Current Limit:

-I

OUT

> 100 mA @ 1.2V V

, 3.3V V

OUT

-I

OUT

> 350 mA @ 2.4V V

, 3.3V V

OUT

-I

OUT

> 350 mA @ 3.3V V

IN,

5.0V V

OUT

• Low Start-up Voltage: 0.65V, typical 3.3V V

OUT

@ 1 mA

• Low Operating Input Voltage: 0.35V, typical

3.3V

OUT

@ 1 mA

• Adjustable Output Voltage Range: 2.0V to 5.5V

• Maximum Input Voltage  V

OUT

< 5.5V

• Automatic PFM/PWM Operation (MCP1640/C):

- 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 (MCP1640/B)

- Input to Output Bypass Option (MCP1640C/D)

• Shutdown Current (All States): < 1 µA

• Low Noise, Anti-Ringing Control

• Overtemperature Protection

• Available Packages:

-SOT23-6

- 2x3 8-Lead 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

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

for applications powered by either one-cell, two-cell, or

three-cell alkaline, NiCd, NiMH, one-cell Li-Ion or

Li-Polymer batteries.

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 components. For standby

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, SOT23-6 and 2x3

DFN-8, are available.

Package Types

MCP1640

2x3 DFN*

GND

OUTS

OUTP

GND

OUT

MCP1640

6-Lead SOT23

* Includes Exposed Thermal Pad (EP); see Table 3-1.

0.65V Start-up Synchronous Boost Regulator with True

Output Disconnect or Input/Output Bypass Option

Summary of content (32 pages)

PAGE 1
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 • 800 mA Typical Peak Input Current Limit: - IOUT > 100 mA @ 1.2V VIN, 3.3V VOUT - IOUT > 350 mA @ 2.4V VIN, 3.3V VOUT - IOUT > 350 mA @ 3.3V VIN, 5.0V VOUT • Low Start-up Voltage: 0.65V, typical 3.3V VOUT @ 1 mA • Low Operating Input Voltage: 0.35V, typical 3.3VOUT @ 1 mA • Adjustable Output Voltage Range: 2.0V to 5.
PAGE 2
MCP1640/B/C/D L1 4.7 µH VIN 0.9V To 1.7V VOUT 3.3V @ 100 mA SW V OUT VIN ALKALINE + CIN 4.7 µF 976 K COUT 10 µF VFB EN 562 K - GND L1 4.7 µH VIN 3.0V To 4.2V LI-ION + VOUT 5.0V @ 300 mA SW V OUTS CIN 4.7 µF VIN VOUTP EN VFB 976 K COUT 10 µF 309 K - PGND SGND Efficiency vs. IOUT for 3.3VOUT 100.0 Efficiency (%) V IN = 2.5V 80.0 V IN = 0.8V V IN = 1.2V 60.0 40.0 0.1 1.0 10.0 100.0 1000.0 Output Current (mA) DS22234A-page 2  2010 Microchip Technology Inc.
PAGE 3
MCP1640/B/C/D 1.0 ELECTRICAL CHARACTERISTICS † 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 the device at those or any other conditions above those indicated in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended periods may affect device reliability. Absolute Maximum Ratings † EN, FB, VIN, VSW, VOUT - GND ........................
PAGE 4
MCP1640/B/C/D DC CHARACTERISTICS (CONTINUED) Electrical Characteristics: Unless otherwise indicated, VIN = 1.2V, COUT = CIN = 10 µF, L = 4.7 µH, VOUT = 3.3V, IOUT = 15 mA, TA = +25°C. Boldface specifications apply over the TA range of -40oC to +85oC. Parameters Sym Min Typ Max Units NMOS Peak Switch Current Limit IN(MAX) 600 850 — mA VOUT Accuracy VOUT% -3 — +3 % Line Regulation VOUT/ VOUT) / VIN| -1 0.01 1 %/V Load Regulation VOUT / VOUT| -1 0.
PAGE 5
MCP1640/B/C/D 2.0 TYPICAL PERFORMANCE CURVES Note: The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
PAGE 6
MCP1640/B/C/D Note: Unless otherwise indicated, VIN = EN = 1.2V, COUT = CIN = 10 µF, L = 4.7 µH, VOUT = 3.3V, ILOAD = 15 mA, TA = +25°C. 3.33 1.00 VIN = 1.2V IOUT = 15 mA VOUT = 3.3V 3.325 3.32 0.85 VIN = 1.8V Startup VIN (V) VOUT (V) 3.315 3.31 3.305 0.70 0.55 3.3 Shutdown VIN = 0.8V 3.295 0.40 3.29 0.25 3.285 -40 -25 -10 5 20 35 50 65 0 80 20 40 Ambient Temperature (°C) FIGURE 2-7: Temperature. 525 Switching Frequency (kHz) VIN = 1.5V 3.36 IOUT = 5 mA VOUT (V) 3.34 3.
PAGE 7
MCP1640/B/C/D Note: Unless otherwise indicated, VIN = EN = 1.2V, COUT = CIN = 10 µF, L = 4.7 µH, VOUT = 3.3V, ILOAD = 15 mA, TA = +25°C. 10000 PWM / PFM PWM ONLY VOUT = 5.0V IIN (µA) 1000 VOUT = 3.3V VOUT = 2.0V 100 VOUT = 2.0V VOUT = 3.3V VOUT = 5.0V 10 0.8 1.1 1.4 1.7 2 2.3 2.6 2.9 3.2 3.5 VIN (V) FIGURE 2-13: VIN. Input No Load Current vs. FIGURE 2-16: MCP1640 3.3V VOUT PFM Mode Waveforms. Switch Resistance (Ohms) 5 4 P - Channel 3 2 1 N - Channel 0 1 1.5 2 2.5 3 3.5 4 4.
PAGE 8
MCP1640/B/C/D Note: Unless otherwise indicated, VIN = EN = 1.2V, COUT = CIN = 10 µF, L = 4.7 µH, VOUT = 3.3V, ILOAD = 15 mA, TA = +25°C. FIGURE 2-19: 3.3V Start-up After Enable. FIGURE 2-22: MCP1640B 3.3V VOUT Load Transient Waveforms. FIGURE 2-20: VENABLE. 3.3V Start-up when VIN = FIGURE 2-23: MCP1640B 2.0V VOUT Load Transient Waveforms. FIGURE 2-21: MCP1640 3.3V VOUT Load Transient Waveforms. DS22234A-page 8 FIGURE 2-24: Waveforms. 3.3V VOUT Line Transient  2010 Microchip Technology Inc.
PAGE 9
MCP1640/B/C/D 3.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1. TABLE 3-1: Pin No.
PAGE 10
MCP1640/B/C/D NOTES: DS22234A-page 10  2010 Microchip Technology Inc.
PAGE 11
MCP1640/B/C/D 4.0 DETAILED DESCRIPTION 4.1.3 4.1 Device Option Overview The MCP1640/B devices incorporate a true output disconnect feature. With the EN pin pulled low, the output of the MCP1640/B is isolated or disconnected from the input by turning off the integrated P-Channel switch and removing the switch bulk diode connection. This removes the DC path typical in boost converters, which allows the output to be disconnected from the input.
PAGE 12
MCP1640/B/C/D 4.2 Functional Description Figure 4-1 depicts the functional block diagram of the MCP1640/B/C/D. The MCP1640/B/C/D is a compact, high-efficiency, fixed frequency, step-up DC-DC converter that provides an easy-to-use power supply solution for applications powered by either one-cell, two-cell, or three-cell alkaline, NiCd, or NiMH, or one-cell Li-Ion or Li-Polymer batteries. VOUT VIN INTERNAL BIAS IZERO DIRECTION CONTROL SW SOFT-START .
PAGE 13
MCP1640/B/C/D 4.2.2 PWM MODE OPERATION In normal PWM operation, the MCP1640/B/C/D operates as a fixed frequency, synchronous boost converter. The switching frequency is internally maintained with a precision oscillator typically set to 500 kHz. The MCP1640B/D devices will operate in PWM only mode even during periods of light load operation. By operating in PWM only mode, the output ripple remains low and the frequency is constant.
PAGE 14
MCP1640/B/C/D NOTES: DS22234A-page 14  2010 Microchip Technology Inc.
PAGE 15
MCP1640/B/C/D 5.0 APPLICATION INFORMATION 5.1 Typical Applications The MCP1640/B/C/D synchronous boost regulator operates over a wide input voltage and output voltage range. The power efficiency is high for several decades of load range. Output current capability increases with input voltage and decreases with increasing output voltage. The maximum output current is based on the N-Channel peak current limit.
PAGE 16
MCP1640/B/C/D 5.5 Inductor Selection The MCP1640/B/C/D is designed to be used with small surface mount inductors; the inductance value can range from 2.2 µH to 10 µH. An inductance value of 4.7 µH is recommended to achieve a good balance between inductor size, converter load transient response and minimized noise. TABLE 5-2: Part Number MCP1640/B/C/D RECOMMENDED INDUCTORS Value (µH) DCR  (typ) ISAT (A) Size WxLxH (mm) SD3110 4.7 0.285 0.68 3.1x3.1x1.0 SD3112 4.7 0.246 0.80 3.1x3.1x1.
PAGE 17
MCP1640/B/C/D Via to GND Plane RBOT RTOP +VIN +VOUT CIN L MCP1640 1 GND GND FIGURE 5-1: COUT Via for Enable MCP1640/B/C/D SOT23-6 Recommended Layout. Wired on Bottom Plane L +VIN +VOUT CIN COUT GND MCP1640 RTOP 1 RBOT Enable GND FIGURE 5-2: MCP1640/B/C/D DFN-8 Recommended Layout.  2010 Microchip Technology Inc.
PAGE 18
MCP1640/B/C/D NOTES: DS22234A-page 18  2010 Microchip Technology Inc.
PAGE 19
MCP1640/B/C/D 6.0 TYPICAL APPLICATION CIRCUITS L1 4.7 µH VOUT MANGANESE LITHIUM DIOXIDE BUTTON CELL + 2.0V TO 3.2V - 5.0V @ 5 mA SW V OUT VIN CIN 4.7 µF 976 K VFB EN COUT 10 µF 309 K ® FROM PIC MCU I/O Note: FIGURE 6-1: GND For applications that can operate directly from the battery input voltage during Sleep mode and require a higher voltage during normal run mode, the MCP1640C device provides input to output bypass when disabled.
PAGE 20
MCP1640/B/C/D NOTES: DS22234A-page 20  2010 Microchip Technology Inc.
PAGE 21
MCP1640/B/C/D 7.0 PACKAGING INFORMATION 7.1 Package Marking Information (Not to Scale) 6-Lead SOT-23 XXNN 8-Lead DFN XXX YWW NN Legend: XX...X Y YY WW NNN e3 * Note: Example BZNN Example AHM 945 25 Customer-specific information Year code (last digit of calendar year) Year code (last 2 digits of calendar year) Week code (week of January 1 is week ‘01’) Alphanumeric traceability code Pb-free JEDEC designator for Matte Tin (Sn) This package is Pb-free.
PAGE 22
MCP1640/B/C/D / $ !$ % $ 0 $$ ,33... 3 " .
PAGE 23
MCP1640/B/C/D Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging  2010 Microchip Technology Inc.
PAGE 24
MCP1640/B/C/D ! " # $ % & ' ( ) )*+, - . "# / $ !$ % $ 0 $$ ,33... 3 " .
PAGE 25
MCP1640/B/C/D ! " # $ % & ' ( ) )*+, - . "# / $ !$ % $ 0 $$ ,33... 3  2010 Microchip Technology Inc. " .
PAGE 26
MCP1640/B/C/D NOTES: DS22234A-page 26  2010 Microchip Technology Inc.
PAGE 27
MCP1640/B/C/D APPENDIX A: REVISION HISTORY Revision A (February 2010) • Original Release of this Document.  2010 Microchip Technology Inc.
PAGE 28
MCP1640/B/C/D NOTES: DS22234A-page 28  2010 Microchip Technology Inc.
PAGE 29
MCP1640/B/C/D PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. PART NO. X X /XX Device Tape and Reel Temperature Range Package Device MCP1640: MCP1640T: MCP1640B: MCP1640BT: MCP1640C: MCP1640CT: MCP1640D: MCP1640DT: 0.65V, PWM/PFM True Disconnect, Sync Boost Regulator 0.65V, PWM/PFM True Disconnect, Sync Boost Regulator (Tape and Reel) 0.65V, PWM Only True Disconnect, Sync Boost Regulator 0.
PAGE 30
MCP1640/B/C/D NOTES: DS22234A-page 30  2010 Microchip Technology Inc.
PAGE 31
Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature.
PAGE 32
WORLDWIDE SALES AND SERVICE AMERICAS ASIA/PACIFIC ASIA/PACIFIC EUROPE Corporate Office 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: http://support.microchip.com Web Address: www.microchip.