Datasheet

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MCP1623/24

Features:

• Up to 96% Typical Efficiency

• 425 mA Typical Peak Input Current Limit:

-I

OUT

> 50 mA @ 1.2V V

, 3.3V V

OUT

-I

OUT

> 175 mA @ 2.4V V

, 3.3V V

OUT

-I

OUT

> 175 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 (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

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

microcontroller 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 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

GND

OUT

MCP1623/24

6-Lead SOT-23

MCP1623/24

2x3 DFN*

GND

OUTS

OUTP

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

Low-Voltage Input Boost Regulator

for PIC

Microcontrollers

Summary of content (28 pages)

PAGE 1
MCP1623/24 Low-Voltage Input Boost Regulator for PIC® Microcontrollers Features: General Description: • Up to 96% Typical Efficiency • 425 mA Typical Peak Input Current Limit: - IOUT > 50 mA @ 1.2V VIN, 3.3V VOUT - IOUT > 175 mA @ 2.4V VIN, 3.3V VOUT - IOUT > 175 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 5.5V • Maximum Input Voltage ≤ VOUT < 5.
PAGE 2
MCP1623/24 L1 4.7 µH VIN 0.9V To 1.7V VOUT 3.3V SW V OUT VIN CIN 4.7 µF ALKALINE + 976 KΩ VFB EN VDD COUT 10 µF PIC® MCU 562 KΩ VSS GND - MCP1623/24 Typical Application Circuit 100 VIN = 2.5V 90 Efficiency (%) 80 VIN = 1.2V 70 VIN = 0.8V 60 50 40 30 20 0.01 0.1 1 10 100 1000 IOUT (mA) MCP1624 Efficiency vs. IOUT, VOUT = 3.3V FIGURE 1: DS41420C-page 2 Typical Application. © 2011 Microchip Technology Inc.
PAGE 3
MCP1623/24 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
MCP1623/24 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 IN(MAX) 300 425 — mA VOUT% -7.4 — +7.4 % Line Regulation |(ΔVOUT/ VOUT) / ΔVIN| — 0.01 — %/V Load Regulation |ΔVOUT / VOUT| — 0.
PAGE 5
MCP1623/24 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
MCP1623/24 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. 100 1.00 90 VOUT = 3.3V VIN = 1.6V 80 0.85 Startup VIN = 1.2V 60 VIN (V) Efficiency (%) 70 50 VIN = 0.8V 40 0.70 0.55 Shutdown 30 0.40 20 10 0 0.01 0.25 0.1 1 10 100 0 1000 20 40 IOUT (mA) VIN = 2.5V VIN = 1.2V Efficiency (%) 70 60 VIN = 0.8V 50 40 30 20 10 0 0.01 525 Switching Frequency (kHz) 90 80 VOUT = 3.
PAGE 7
MCP1623/24 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: MCP1624 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
MCP1623/24 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: MCP1623 3.3V VOUT Load Transient Waveforms. MCP1623 PWM FIGURE 2-20: VENABLE. 3.3V Start-up when VIN = FIGURE 2-21: MCP1624 3.3V VOUT Load Transient Waveforms. DS41420C-page 8 FIGURE 2-23: MCP1623 2.0V VOUT Load Transient Waveforms. FIGURE 2-24: Waveforms. 3.
PAGE 9
MCP1623/24 3.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1.
PAGE 10
MCP1623/24 4.0 DETAILED DESCRIPTION 4.1 Device Option Overview The MCP1623/24 family of devices is capable of low start-up voltage and delivers high efficiency over a wide load range for single cell, two cell, three cell alkaline, NiMH, NiCd and single cell Li-Ion battery inputs. A high level of integration lowers total system cost, eases implementation and reduces board area.
PAGE 11
MCP1623/24 4.2 Functional Description 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. The MCP1623/24 charges an internal capacitor with a very weak current source. The voltage on this capacitor, in turn, slowly ramps the current limit of the boost switch to its nominal value. The soft-start capacitor is completely discharged in the event of a commanded shutdown or a thermal shutdown.
PAGE 12
MCP1623/24 4.2.2 PWM MODE OPERATION In normal PWM operation, the MCP1623/24 operates as a fixed frequency, synchronous boost converter. The switching frequency is internally maintained with a oscillator typically set to 500 kHz. The MCP1623 device will operate in PWM-only mode even during periods of light load operation. By operating in PWMonly mode, the output ripple remains low and the frequency is constant.
PAGE 13
MCP1623/24 5.0 APPLICATION INFORMATION 5.1 Typical Applications The MCP1623/24 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 14
MCP1623/24 5.5 Inductor Selection The MCP1623/24 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 MCP1623/24 RECOMMENDED INDUCTORS Value (µH) DCR Ω (typ) ISAT (A) Size WxLxH (mm) 4.7 0.190 1.5 2.5x3.2x2.0 Coilcraft® ME3220 LPS3015 4.7 0.200 1.2 3.0x3.0x1.
PAGE 15
MCP1623/24 5.7 PCB Layout Information Good printed circuit board layout techniques are important to any switching circuitry and switching power supplies are no different. When wiring the switching high current paths, short and wide traces should be used. Therefore, it is important that the input and output capacitors be placed as close as possible to the MCP1623/24 to minimize the loop area.
PAGE 17
MCP1623/24 6.0 PACKAGING INFORMATION 6.1 Package Marking Information (Not to Scale) 6-Lead SOT-23 Example XXNN CJNN Package Marking MCP1623 HUNN MCP1624 CJNN 8-Lead DFN Example XXX YWW NN AKH 050 25 Package Marking Legend: XX...
PAGE 18
MCP1623/24 6-Lead Plastic Small Outline Transistor (CHY) [SOT-23] Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging b 4 N E E1 PIN 1 ID BY LASER MARK 1 2 3 e e1 D A A2 c φ L A1 L1 Units Dimension Limits Number of Pins MILLIMETERS MIN N NOM MAX 6 Pitch e 0.95 BSC Outside Lead Pitch e1 1.90 BSC Overall Height A 0.90 – Molded Package Thickness A2 0.89 – 1.45 1.30 Standoff A1 0.
PAGE 19
MCP1623/24 6-Lead Plastic Small Outline Transistor (CHY) [SOT-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.
PAGE 20
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PAGE 23
MCP1623/24 APPENDIX A: REVISION HISTORY Revision C (February 2011) The following is the list of modifications: 1. 2. 3. Added the 8-lead, 2x3 DFN package and related information throughout the document. Updated the package marking information and drawings. 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.
PAGE 25
MCP1623/24 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: MCP1623: MCP1623T: MCP1624: MCP1624T: = 0.65V, PWM Only True Disconnect, Sync Boost Regulator 0.65V, PWM Only True Disconnect, Sync Boost Regulator (Tape and Reel) 0.65V, PWM/PFM True Disconnect, Sync Boost Regulator 0.
PAGE 27
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 28
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