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MCP16322 Datasheet

Download or read online Microchip Technology MCP16322 24V Input, 1A/2A Output, High Efficiency Synchronous Buck Regulator With Power Good Indication pdf datasheet.



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24V Input, 1A/2A Output, High Efficiency Synchronous Buck Regulator
Features
• Up to 95% Typical Efficiency
• Input Voltage Range: 6.0V to 24V
• 1A Output Current (MCP16321)
• 2A Output Current (MCP16322)
• Fixed Output Voltages: 0.9V, 1.5V, 1.8V, 2.5V,
3.3V, 5V with 2% Output Voltage Accuracy
• Adjustable Version Output Voltage Range:
0.9V to 5V with 1.5% Reference Voltage Accuracy
• Integrated N-Channel High-Side Switch: 180 mΩ
• Integrated N-Channel Low-Side Switch: 120 mΩ
• 1 MHz Fixed Frequency
• Low Device Shutdown Current
• Peak Current Mode Control
• Internal Compensation
• Stable with Ceramic Capacitors
• Internal Soft-Start
• Cycle-by-Cycle Peak Current Limit
• Undervoltage Lockout (UVLO): 5.75V
• Overtemperature Protection
• V
Overvoltage Protection
OUT
• V
Voltage Supervisor Reported at the PG Pin
OUT
• Available Package: QFN-16 (3x3 mm)
Applications
®
®
• PIC
/dsPIC
Microcontroller Bias Supply
• 12V Industrial Input DC-DC Conversion
• Set-Top Boxes
• DSL Cable Modems
• Automotive
• Wall Cube Regulation
• SLA Battery Powered Devices
• AC-DC Digital Control Power Source
• Power Meters
• Consumer
• Medical and Health Care
• Distributed Power Supplies
© 2011 Microchip Technology Inc.
MCP16321/2
with Power Good Indication
Description
The MCP16321/2 is a highly integrated, high-efficiency,
fixed frequency, synchronous step-down DC-DC
converter in a 16-pin QFN package that operates from
input voltages up to 24V. Integrated features include a
high-side and low-side N-Channel switch, fixed
frequency Peak Current Mode Control, internal
compensation, peak current limit, V
protection and overtemperature protection. Minimal
external components are necessary to develop a
complete synchronous step-down DC-DC converter
power supply.
High converter efficiency is achieved by integrating a
high-speed, current limited, low resistance, high-side
N-Channel MOSFET, as well as a high-speed, low
resistance,
associated drive circuitry. High switching frequency
minimizes the size of the inductor and output capacitor,
resulting in a small solution size.
The MCP16321/2 device can supply 1A/2A of
continuous current while regulating the output voltage
from 0.9V to 5V. A high-performance peak current
mode architecture keeps the output voltage tightly
regulated, even during input voltage steps and output
current transient conditions that are common in power
supplies.
The regulator can be turned on and off with a logic level
signal applied to the EN input. The EN input is internally
pulled up to a 4.2V reference and is rated for a
maximum of 6V. With EN low, typically 5 µA of current
is consumed from the input, making the part ideal for
power shedding and load distribution applications. The
PG output is an open drain output pin used to interface
with other components of the system, and can be
pulled up to a maximum of 6V.
The output voltage can either be fixed at output
voltages of 0.9V, 1.5V, 1.8V, 2.5V, 3.3V, 5V or
adjustable using an external resistor divider. The
MCP16321/2 is offered in a 3x3 QFN-16 surface mount
package.
overvoltage
OUT
low-side
N-Channel
MOSFET
and
DS22285A-page 1

Summary of Contents

Page 1

... Input, 1A/2A Output, High Efficiency Synchronous Buck Regulator Features • 95% Typical Efficiency Input Voltage Range: 6.0V to 24V 1A Output Current (MCP16321) 2A Output Current (MCP16322) Fixed Output Voltages: 0.9V, 1.5V, 1.8V, 2.5V, 3.3V, 5V with 2% Output Voltage Accuracy Adjustable Version Output Voltage Range: 0. with 1.5% Reference Voltage Accuracy • ...

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... BOOST BOOST 4.7 µ 36 OUT GND GND C BOOST BOOST 4.7 µ OUT 10 kŸ GND GND V OUT 4.2V @ 1A/2A C OUT 2x22 µ OUT 3.3V @ 1A/2A C OUT 2x22 µF © 2011 Microchip Technology Inc. ...

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... Undervoltage Lockout IN Undervoltage Lockout Start UVLO Undervoltage Lockout UVLO Hysteresis Output Characteristics Maximum Output Current MCP16321 Maximum Output Current MCP16322 Output Voltage Adjust Range Output Voltage Tolerance V in PWM Mode Output Voltage Tolerance V in PFM Mode Feedback Voltage Feedback Reference Tolerance ...

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... ms 1.1 MHz Open Loop V FB Low 99 % Open Loop V FB Low Note 1 % mΩ mΩ 2.4 A MCP16321 3.4 A MCP16322 0. -0 µ ms 95% V OUT °C °C © 2011 Microchip Technology Inc. ...

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... Temperature Ranges Operating Junction Temperature Range Storage Temperature Range Maximum Junction Temperature Package Thermal Resistances Thermal Resistance, 16L 3x3-QFN Note 1: Measured using a 4-layer FR4 Printed Circuit Board with a 13.5 in © 2011 Microchip Technology Inc. Sym Min Typ Max T -40 125 ...

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... MCP16321/2 NOTES: DS22285A-page 6 © 2011 Microchip Technology Inc. ...

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... 18V OUT 24V 0.4 0.8 1.2 I (A) OUT FIGURE 2-3: 2.5V V Efficiency vs. OUT I OUT. © 2011 Microchip Technology Inc. 12V Floating (Internally pulled up 200 mA 25°C. MCP16321 maximum output current 1A. A 100 OUT 50 40 1.6 2 FIGURE 2-4: OUT I . OUT 90 V ...

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... OUT V 1.8V OUT 12V 18V IN 0.4 0.8 1.2 1 (A) OUT 1.8V V vs. I OUT OUT. V 1.5V OUT 12V 16V IN 0.4 0.8 1.2 1 (A) OUT 1.5V V vs. I OUT OUT. V 0.9V OUT 10V IN 0.4 0.8 1.2 1 (A) OUT 0.9V V vs. I OUT OUT. © 2011 Microchip Technology Inc. ...

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... I OUT 2.496 (V) IN FIGURE 2-15: 2. OUT © 2011 Microchip Technology Inc. 12V Floating (Internally pulled up 200 mA 25°C. MCP16321 maximum output current 1A. A 1.804 1.803 1.802 1.801 1.8 1.799 1.798 FIGURE 2-16: 1.503 1.5025 1 ...

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... C 2x22 µF, IN OUT - 110 Ambient Temperature (°C) Oscillator Frequency vs. 300 mA). OUT OUT - 110 Ambient Temperature (°C) Input Quiescent Current vs OUT - 110 Ambient Temperature (°C) Input Current vs. © 2011 Microchip Technology Inc. ...

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... OUT V 12V IN FIGURE 2-26: Light Load Switching Waveforms 3.3V OUT I 500 mA OUT V 12V IN FIGURE 2-27: Heavy Load Switching Waveforms. © 2011 Microchip Technology Inc. 12V Floating (Internally pulled up 200 mA 25°C. MCP16321 maximum output current 1A 3.3V OUT I 200 mA OUT V 12V IN 1.8 2 Ratio FIGURE 2-28: ...

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... MCP16321/2 Note: Unless otherwise indicated 4.7 µH (XAL6060-472MEB), I LOAD V 3.3V OUT I 200 mA OUT 10V IN FIGURE 2-31: Line Transient Response. DS22285A-page 12 12V Floating (Internally pulled up 200 mA 25°C. MCP16321 maximum output current 1A µ 2x22 µF, IN OUT © 2011 Microchip Technology Inc. ...

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... The input capacitors provide AC current for the high-side power switch and a stable voltage source for the internal device power. This capacitor should be connected as close as possible to the V pins. © 2011 Microchip Technology Inc. Table 3-1. Description ...

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... Exposed Thermal Pad (EP) There is no internal electrical connection between the Exposed Thermal Pad (EP) and the P pins. The EP must be connected to GND on the Printed Circuit Board (PCB). DS22285A-page 14 ) and S GND GND © 2011 Microchip Technology Inc. ...

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... Resistor divider (adjustable version only) The selection of the external inductor, output capacitor, input capacitor and boost capacitor is dependent upon the output voltage and the maximum output current. © 2011 Microchip Technology Inc. MCP16321/2 4.1.4 ENABLE INPUT The enable input (EN) is used to disable the device. If disabled, the device consumes a minimal current from the input ...

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... Comparator FIGURE 4-1: MCP16321/2 Block Diagram. DS22285A-page 16 UV Protection OTEMP Protection Monitor and BOOST Control Voltage Current Limit Slope Comp HS PWM Drive Gate Drive Internal Bias Control 1 MHz LS Drive SGND BOOST CS C BOOST OUT C OUT PGND © 2011 Microchip Technology Inc. ...

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... The average of the chopped input voltage or SW node voltage is equal to the output voltage, while the average inductor current is equal to the output current. © 2011 Microchip Technology Inc ...

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... Therefore, when the maximum duty cycle approaches, the switch node is forced off for 240 ns every 8 cycles to ensure that the boost cap gets replenished. © 2011 Microchip Technology Inc. ...

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... A 10 kΩ resistor is recommended as a good trade-off for quiescent current and noise immunity. © 2011 Microchip Technology Inc. 5.0.3 GENERAL DESIGN EQUATIONS The step-down converter duty cycle can be estimated using Equation 5-2 Inductor Current Mode ...

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... MCP16322 RECOMMENDED INDUCTORS Size DCR I SAT WxLxH (µH) (Ω) (A) (mm) 4.7 0.056 2.84 6.1x6.1x3.2 4.7 0.065 3.2 6.2x6.2x2.5 4.7 0.024 3.16 7.3x7.3x4.1 4.7 0.054 2.6 8.89x6.1x5.0 ® 4.7 0.06 2.5 5.9x6.2x3.3 4.7 0.057 2 ...

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... Circuit Board with a 13.5 in copper ground plane smaller ground plane will result in a larger θ and external EXAMPLE 5-6: DIS Total System Dissipation 943 mW × OUT MCP16322 internal power dissipation estimate: Estimated Junction 30.14°C MCP16321/2 POWER DISSIPATION MCP16321 V 12V 5.0V OUT OUT Efficiency 92 ...

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... IN Figure 5- placed close IN and L OUT return close to C OUT IN should be placed between the BOOST pin to place R and FB TOP are routed away from the switch BOT L R 10Ω BOOST R R BOT TOP Trace on GND © 2011 Microchip Technology Inc. ...

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... COMPONENTS Component Value µ µF OUT L 4.7 µH R 36.5 kΩ TOP R 10 kΩ BOT R 10 kΩ BOOST © 2011 Microchip Technology Inc. C BOOST L BOOST OUT GND GND MCP16321/2 V OUT 0. 10Ω ...

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... MCP16321/2 NOTES: DS22285A-page 24 © 2011 Microchip Technology Inc. ...

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... Microchip Technology Inc. Part Number Code MCP16321T-150E/NG AAA MCP16321T-180E/NG AAB MCP16321T-250E/NG AAC MCP16321T-330E/NG AAD MCP16321T-500E/NG AAE MCP16321T-ADJE/NG AAF MCP16322T-150E/NG ABA MCP16322T-180E/NG ABB MCP16322T-250E/NG ABC MCP16322T-330E/NG ABD MCP16322T-500E/NG ABE MCP16322T-ADJE/NG ABF MCP16321/2 Example AAA E114 5256 ) e 3 DS22285A-page 25 ...

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... MCP16321/2 DS22285A-page 26 © 2011 Microchip Technology Inc. ...

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... Microchip Technology Inc. MCP16321/2 DS22285A-page 27 ...

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... MCP16321/2 DS22285A-page 28 © 2011 Microchip Technology Inc. ...

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... APPENDIX A: REVISION HISTORY Revision A (December 2011) Original Release of this Document. © 2011 Microchip Technology Inc. MCP16321/2 DS22285A-page 29 ...

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... MCP16321/2 NOTES: DS22285A-page 30 © 2011 Microchip Technology Inc. ...

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... Microchip Technology Inc. X /XX Examples: a) MCP16321T-150E/NG: Package Range b) MCP16321T-ADJE/NG: c) MCP16322T-150E/NG: d) MCP16322T-ADJE/NG: MCP16321/2 . Tape and Reel, 1.5V Output Voltage, Extended Temperature 16LD QFN Package Tape and Reel, Adjustable Output Voltage, Extended Temperature 16LD QFN Package Tape and Reel, 1.5V Output Voltage, Extended Temperature ...

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... MCP16321/2 NOTES: DS22285A-page 32 © 2011 Microchip Technology Inc. ...

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... 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 ...

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... Singapore Tel: 65-6334-8870 Fax: 65-6334-8850 Taiwan - Hsin Chu Tel: 886-3-5778-366 Fax: 886-3-5770-955 Taiwan - Kaohsiung Tel: 886-7-536-4818 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. 11/29/11 ...

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