MCP16321/2 Data Sheet

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 2011-2016 Microchip Technology Inc.

DS20002285B-page 1

MCP16321/2

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

OUT

 Overvoltage Protection

• V

OUT 

Voltage Supervisor Reported at the PG Pin

• 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

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

OUT

 overvoltage

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, low-side N-Channel MOSFET and
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.

24V Input, 1A/2A Output, High Efficiency Synchronous Buck Regulator

with Power Good Indication

Obsolete Device

For further designs, please refer to the MIC24046 or MCP16311/2 Data Sheets

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MCP16321/2

DS20002285B-page 2

 2011-2016 Microchip Technology Inc.

Package Type

Typical Applications

2

MCP16321/2

3x3 QFN*

V

IN

S

GND

SW

SW

V

IN

FB

BOOST

NC

NC

PG

EN

SW

P

GN

D

P

GN

D

SW

V

IN

EP

16

1

15 14 13

3

4

12

11

10

9

5

6

7

8

17

* Includes Exposed Thermal Pad (EP); see 

Table 3-1

.

S

GND

P

GND

SW

V

FB

V

IN

EN

BOOST

V

IN

6.0V to 24V

C

BOOST

22 nF

L1

4.7 μH

C

IN

2x10 μF

C

OUT

2x22 μF

V

OUT

4.2V @ 1A/2A

10 k

ȍ

36.5 k

ȍ

PG

V

OUT

10 k

ȍ

S

GND

P

GND

SW

V

FB

V

IN

EN

BOOST

V

IN

6.0V to 24V

C

BOOST

22 nF

L1

4.7 μH

C

IN

2x10 μF

C

OUT

2x22 μF

V

OUT

3.3V @ 1A/2A

PG

V

OUT

10

 kŸ 

M

C

P1

632

1/2

MCP

163

21/2

Typical Application with Fixed Output Voltage

Typical Application with Adjustable Output Voltage

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 2011-2016 Microchip Technology Inc.

DS20002285B-page 3

MCP16321/2

1.0

ELECTRICAL 
CHARACTERISTICS

Absolute Maximum Ratings†

V

IN

.................................................................... -0.3V to 26.4V

SW ...................................................................... -1V to 26.4V
BOOST – GND ........................................... -0.3V to (V

IN

+6V)

EN,V

FB

, PG Voltage.............................................. -0.3V to 6V

Continuous Total Power Dissipation .......................................  

...................................................See Thermal Characteristics

Storage Temperature ....................................-65°C to +150°C
Operating Junction Temperature...................-40°C to +125°C
ESD Protection On All Pins:

HBM ......................................................................... 3 kV
MM ..........................................................................200V

† Notice:

 Stresses above those listed under “Absolute

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.

DC CHARACTERISTICS

Electrical Characteristics:

 Unless otherwise indicated, T

A

= +25°C, V

IN

= 12V,  V

OUT

= 3.3V, I

OUT

= 300 mA, 

L = 4.7 µH,  C

OUT

= 2x22 µF,  C

IN

= 2x10 µF. Boldface specifications apply over the T

J

 range of -40°C to +125°C.

Parameters

Sym.

Min.

Typ.

Max.

Units Conditions

V

IN

 Supply Voltage

Input Voltage

V

IN

6.0

24

V

Quiescent Current 
(Switching)

I

Q

5.2

mA

I

OUT

 = 0 mA

Quiescent Current 
(Non-Switching)

I

Q

2.3

mA

Closed Loop in 
Overvoltage
I

OUT

 = 0 mA

Quiescent Current - 
Shutdown

I

Q

5

10

µA

EN = 0

V

IN

 Undervoltage Lockout

Undervoltage Lockout Start

UVLO

STRT

5.5

5.75

6.0

V

V

IN

 Rising

Undervoltage Lockout 
Hysteresis

UVLO

HYS

0.65

V

Non-Switching

Output Characteristics
Maximum Output Current 
MCP16321

I

OUT

1

A

V

IN

 = 6V to 24V

Maximum Output Current 
MCP16322

I

OUT

2

A

V

IN

 = 6V to 24V

Output Voltage Adjust Range

V

OUT

0.9

5.0

V

Output Voltage Tolerance 
in PWM Mode

V

OUT-PWM

V

OUT

- 2%

V

OUT

V

OUT

  + 2%

V

I

OUT

 = 1A

Output Voltage Tolerance 
in PFM Mode

V

OUT-PFM

V

OUT

- 1%

V

OUT

+ 1% V

OUT

+ 3.5%

V

I

OUT

 = 0A

Feedback Voltage

V

FB

0.886

0.9

0.914

V

Feedback Reference 
Tolerance

V

FB-TOL

-1.5

1.5

%

PFM Mode Feedback 
Comparator Threshold

V

FB-PFM

V

OUT

 + 1%

V

Feedback Input Bias 
Current

I

FB

100

nA

Note 1:

Regulator SW pin is forced off for 240 ns every eight cycles to ensure the BOOST cap is replenished.

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MCP16321/2

DS20002285B-page 4

 2011-2016 Microchip Technology Inc.

PFM Mode Feedback

V

FB-PFM

V

OUT

 + 1%

V

EN Input Characteristics
EN Input Logic High

V

IH

2.2

V

EN Input Logic Low

V

IL

0.8

V

EN Input Hysteresis

V

EN-HYST

480

mV

EN Input Leakage Current

I

ENLK

3.5

µA

V

EN

 = 5V

-1.5

µA

V

EN

 = 0V

Soft-Start Time

t

SS

4

ms

Switching Characteristics
Switching Frequency

f

SW

0.9

1

1.1

MHz Open Loop V

FB

 

Low

Maximum Duty Cycle

DC

MAX

95

97

99

%

Open Loop V

FB

 

Low

Note 1

Minimum Duty Cycle

7

%

NMOS Low-Side 
Switch On Resistance

Low-Side R

DS(ON)

120

m

NMOS High-Side 
Switch On Resistance

High-Side 

R

DS(ON)

180

m

NMOS High-Side 
Switch Current Limit

I

N(MAX)

1.4

1.8

2.4

A

MCP16321

2.4

2.8

3.4

A

MCP16322

PG Output Characteristics
PG Low-level 
Output Voltage

PG

IL

0.01

V

I

PG

 = -0.3 mA

PG High-Level Output Leak-
age Current

I

PGLK

0.5

µA

V

PG

 = 5V

PG Release Timer

t

PG

10

ms

V

OUT

 Undervoltage Threshold

V

OUT-UV

91% V

OUT

93% V

OUT

95% V

OUT

V

OUT

 Undervoltage 

Hysteresis

V

OUT-UV_HYST

1.5% V

OUT

V

OUT

 Overvoltage 

Threshold

V

OUT-OV

103% V

OUT

V

OUT

 Overvoltage 

Hysteresis

V

OUT-OV_HYST

1% V

OUT

Thermal Characteristics
Thermal Shutdown 
Die Temperature

T

SD

170

°C

Die Temperature 
Hysteresis

T

SDHYS

10

°C

DC CHARACTERISTICS (CONTINUED)

Electrical Characteristics:

 Unless otherwise indicated, T

A

= +25°C, V

IN

= 12V,  V

OUT

= 3.3V, I

OUT

= 300 mA, 

L = 4.7 µH,  C

OUT

= 2x22 µF,  C

IN

= 2x10 µF. Boldface specifications apply over the T

J

 range of -40°C to +125°C.

Parameters

Sym.

Min.

Typ.

Max.

Units Conditions

Note 1:

Regulator SW pin is forced off for 240 ns every eight cycles to ensure the BOOST cap is replenished.

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 2011-2016 Microchip Technology Inc.

DS20002285B-page 5

MCP16321/2

TABLE 1-1:

TEMPERATURE CHARACTERISTICS

Electrical Characteristics

Parameters

Sym.

Min.

Typ.

Max.

Units

Conditions

Temperature Ranges
Operating Junction Temperature 
Range

T

J

-40

125

°C

Steady State

Storage Temperature Range

T

A

-65

150

°C

Maximum Junction Temperature

T

J

150

°C

Transient

Package Thermal Resistances
Thermal Resistance, 16L 3x3-QFN

JA

38.5

°C/W

Note 1

Note 1:

Measured using a 4-layer FR4 Printed Circuit Board with a 13.5 in

2

, 1 oz internal copper ground plane.

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MCP16321/2

DS20002285B-page 6

 2011-2016 Microchip Technology Inc.

NOTES:

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 2011-2016 Microchip Technology Inc.

DS20002285B-page 7

MCP16321/2

2.0

TYPICAL PERFORMANCE CURVES

Note:

 Unless otherwise indicated, V

IN

= 12V, EN = Floating (Internally pulled up), C

IN

= 20  µF,  C

OUT

= 2x22 µF,

L = 4.7 µH (XAL6060-472MEB), I

LOAD

= 200 mA,  T

A

= +25°C. MCP16321 maximum output current = 1A.

FIGURE 2-1:

5V V

OUT

 Efficiency vs. I

OUT

.

FIGURE 2-2:

3.3V V

OUT

 Efficiency vs. 

I

OUT.

FIGURE 2-3:

2.5V V

OUT

 Efficiency vs. 

I

OUT.

FIGURE 2-4:

1.8V V

OUT

 Efficiency vs. 

I

OUT

.

FIGURE 2-5:

1.5V V

OUT

 Efficiency vs. 

I

OUT.

FIGURE 2-6:

0.9V V

OUT

 Efficiency vs. 

I

OUT.

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.

50

55

60

65

70

75

80

85

90

95

100

0.0

0.4

0.8

1.2

1.6

2.0

Efficiency

 (%

)

I

OUT

(A)

V

IN

= 6V

V

IN

= 24V

V

IN

= 18V

V

IN

= 12V

V

OUT

= 5V

50

55

60

65

70

75

80

85

90

95

0

0.4

0.8

1.2

1.6

2

Efficiency

 (%

)

I

OUT

(A)

V

IN

= 24V

V

IN

= 6V

V

IN

= 18V

V

IN

= 12V

V

OUT

= 3.3V

40

50

60

70

80

90

100

0

0.4

0.8

1.2

1.6

2

Efficiency

 (%

)

I

OUT 

(A)

V

IN

= 24V

V

IN

= 6V

V

IN

= 18V

V

IN

= 12V

V

OUT

= 2.5V

40

50

60

70

80

90

100

0

0.4

0.8

1.2

1.6

2

Efficiency

 (%

)

I

OUT

(A)

V

IN

= 6V

V

IN

= 18V

V

IN

= 12V

V

OUT

= 1.8V

40

45

50

55

60

65

70

75

80

85

90

0

0.4

0.8

1.2

1.6

2

Efficiency

 (%

)

I

OUT

(A)

V

IN

= 6V

V

IN

= 18V

V

OUT

= 1.5V

V

IN

= 12V

40

50

60

70

80

90

100

0

0.4

0.8

1.2

1.6

2

Efficiency

 (%

)

I

OUT

(A)

V

IN

= 10V

V

IN

= 6V

V

IN

= 8V

V

OUT

= 0.9V

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MCP16321/2

DS20002285B-page 8

 2011-2016 Microchip Technology Inc.

Note:

 Unless otherwise indicated, V

IN

= 12V, EN = Floating (Internally pulled up), C

IN

= 20 µF, C

OUT

= 2x22 µF,

L = 4.7 µH (XAL6060-472MEB), I

LOAD

= 200 mA,  T

A

= +25°C. MCP16321 maximum output current = 1A.

FIGURE 2-7:

5V V

OUT

 vs. I

OUT.

FIGURE 2-8:

3.3V V

OUT

 vs. I

OUT.

FIGURE 2-9:

2.5V V

OUT

 vs. I

OUT.

FIGURE 2-10:

1.8V V

OUT

 vs. I

OUT.

FIGURE 2-11:

1.5V V

OUT

 vs. I

OUT.

FIGURE 2-12:

0.9V V

OUT

 vs. I

OUT.

4.98

4.99

5

5.01

5.02

5.03

5.04

0

0.4

0.8

1.2

1.6

2

V

OUT

(V)

I

OUT

(A)

V

IN

= 6V

V

IN

= 12V

V

IN

= 24V

V

IN

= 18V

V

OUT

= 5V

3.295

3.3

3.305

3.31

3.315

3.32

0

0.4

0.8

1.2

1.6

2

V

OUT

(V)

I

OUT

(A)

V

IN

= 6V

V

IN

= 12V

V

IN

= 24V

V

IN

= 18V

V

OUT

=3.3V

2.495

2.497

2.499

2.501

2.503

2.505

2.507

2.509

2.511

2.513

2.515

0

0.4

0.8

1.2

1.6

2

V

OUT

(V)

I

OUT

(A)

V

IN

= 6V

V

IN

= 12V

V

IN

= 24V

V

IN

= 18V

V

OUT

=2.5V

1.798

1.799

1.8

1.801

1.802

1.803

1.804

1.805

1.806

1.807

1.808

0

0.4

0.8

1.2

1.6

2

V

OUT

(V)

I

OUT

(A)

V

IN

= 6V

V

IN

= 12V

V

IN

= 18V

V

OUT

=1.8V

1.498

1.499

1.5

1.501

1.502

1.503

1.504

1.505

0

0.4

0.8

1.2

1.6

2

V

OUT

(V)

I

OUT

(A)

V

IN

= 6V

V

IN

= 12V

V

IN

= 16V

V

OUT

=1.5V

0.897

0.898

0.899

0.9

0.901

0.902

0.903

0.904

0

0.4

0.8

1.2

1.6

2

V

OUT

(V)

I

OUT

(A)

V

IN

= 6V

V

IN

= 8V

V

IN

= 10V

V

OUT

=0.9V

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DS20002285B-page 9

MCP16321/2

Note:

 Unless otherwise indicated, V

IN

= 12V, EN = Floating (Internally pulled up), C

IN

= 20  µF,  C

OUT

= 2x22 µF,

L = 4.7 µH (XAL6060-472MEB), I

LOAD

= 200 mA,  T

A

= +25°C. MCP16321 maximum output current = 1A.

FIGURE 2-13:

5V V

OUT

 vs V

IN.

FIGURE 2-14:

3.3V V

OUT

 vs V

IN.

FIGURE 2-15:

2.5V V

OUT

 vs V

IN.

FIGURE 2-16:

1.8V V

OUT

 vs V

IN.

FIGURE 2-17:

1.5V V

OUT

 vs V

IN.

FIGURE 2-18:

0.9V V

OUT

 vs V

IN.

4.985

4.99

4.995

5

5.005

5.01

5.015

5.02

6

8

10

12

14

16

18

20

22

24

V

OUT

(V)

V

IN

(V)

I

OUT

= 1A

I

OUT

= 2A

V

OUT

= 5V

3.294

3.296

3.298

3.3

3.302

3.304

3.306

3.308

3.31

6

8

10

12

14

16

18

20

22

24

V

OUT

(V)

V

IN

(V)

I

OUT

= 1A

I

OUT

= 2A

V

OUT

= 3.3V

2.496

2.497

2.498

2.499

2.5

2.501

2.502

2.503

2.504

2.505

2.506

6

8

10

12

14

16

18

20

22

24

V

OUT

(V)

V

IN

(V)

I

OUT

= 1A

I

OUT

= 2A

V

OUT

= 2.5V

1.798

1.799

1.8

1.801

1.802

1.803

1.804

6

8

10

12

14

16

18

V

OUT

(V)

V

IN

(V)

I

OUT

= 2A

I

OUT

= 1A

V

OUT

= 1.8V

1.4985

1.499

1.4995

1.5

1.5005

1.501

1.5015

1.502

1.5025

1.503

6

8

10

12

14

16

V

IN

(V)

V

OUT

(V)

I

OUT

= 2A

I

OUT

= 1A

V

OUT

= 1.5V

0.8994

0.8996

0.8998

0.9

0.9002

0.9004

0.9006

0.9008

0.901

0.9012

6

7

8

9

10

V

OUT

(V)

V

IN

(V)

I

OUT

= 2A

I

OUT

= 1A

V

OUT

= 0.9V

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MCP16321/2

DS20002285B-page 10

 2011-2016 Microchip Technology Inc.

Note:

 Unless otherwise indicated, V

IN

= 12V, EN = Floating (Internally pulled up), C

IN

= 20 µF, C

OUT

= 2x22 µF,

L = 4.7 µH (XAL6060-472MEB), I

LOAD

= 200 mA,  T

A

= +25°C. MCP16321 maximum output current = 1A.

FIGURE 2-19:

Shutdown Current vs. Input 

Voltage.

FIGURE 2-20:

Shutdown Current vs. 

Temperature.

FIGURE 2-21:

Output Voltage vs. 

Temperature.

FIGURE 2-22:

Oscillator Frequency vs. 

Temperature (I

OUT

= 300 mA).

FIGURE 2-23:

Input Quiescent Current vs. 

Temperature (No Load, Switching).

FIGURE 2-24:

Input Current vs. 

Temperature (No Load, No Switching).

0

1

2

3

4

5

6

7

8

6

10

14

18

22

Shudow

n Current 

(µA)

V

IN

(V)

4.45

4.50

4.55

4.60

4.65

4.70

4.75

4.80

4.85

4.90

-40

-10

20

50

80

110

Shutdow

n Current 

(µA)

Ambient Temperature (°C)

3.284

3.286

3.288

3.290

3.292

3.294

3.296

3.298

3.300

-40

-10

20

50

80

110

V

OUT

(V)

Ambient Temperature (°C)

I

OUT

= 0.1A

I

OUT

= 1A

980

985

990

995

1000

1005

1010

1015

1020

-40

-10

20

50

80

110

Oscillator Frequency

 (kHz)

Ambient Temperature (°C)

5.20

5.25

5.30

5.35

5.40

5.45

5.50

-40

-10

20

50

80

110

Sw

itching Quiscent 

Current 

(mA)

Ambient Temperature (°C)

I

OUT

= 0A

2.28

2.30

2.32

2.34

2.36

2.38

2.40

2.42

-40

-10

20

50

80

110

Non-Sw

itching Quiscent 

Current 

(mA)

Ambient Temperature (°C)

I

OUT

= 0A

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Microchip Technology Inc.
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