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MCP16322 Datasheet
High Efficiency Synchronous Buck Regulator

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Obsolete Device
For further designs, please refer to the MIC24046 or MCP16311/2 Data Sheets
MCP16321/2
24V Input, 1A/2A Output, High Efficiency Synchronous Buck Regulator
with Power Good Indication
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 m
• Integrated N-Channel Low-Side Switch: 120 m
• 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
• VOUT Overvoltage Protection
• VOUT 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, VOUT 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.
2011-2016 Microchip Technology Inc.
DS20002285B-page 1


MCP16322 Datasheet
High Efficiency Synchronous Buck Regulator

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MCP16321/2
Package Type
MCP16321/2
3x3 QFN*
16 15 14 13
SW 1
12 SW
VIN 2
VIN 3
SGND 4
5
EP
17
67
11 VIN
10 BOOST
9 EN
8
* Includes Exposed Thermal Pad (EP); see Table 3-1.
Typical Applications
Typical Application with Adjustable Output Voltage
VIN
6.0V to 24V
CIN
2x10 μF
BOOST
CBOOST
22 nF
SW
L1
4.7 μH
VIN
36.5 kȍ
VFB
VOUT
10 kȍ
10 kȍ
EN PG
SGND
PGND
VOUT
4.2V @ 1A/2A
COUT
2x22 μF
Typical Application with Fixed Output Voltage
VIN
6.0V to 24V
CIN
2x10 μF
CBOOST
22 nF
BOOST
SW
L1
4.7 μH
VIN
VFB
VOUT
10 kŸ
EN PG
SGND
PGND
VOUT
3.3V @ 1A/2A
COUT
2x22 μF
DS20002285B-page 2
2011-2016 Microchip Technology Inc.


MCP16322 Datasheet
High Efficiency Synchronous Buck Regulator

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MCP16321/2
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings†
VIN.................................................................... -0.3V to 26.4V
SW ...................................................................... -1V to 26.4V
BOOST – GND ........................................... -0.3V to (VIN+6V)
EN,VFB, 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, TA = +25°C, VIN = 12V, VOUT = 3.3V, IOUT = 300 mA,
L = 4.7 µH, COUT = 2x22 µF, CIN = 2x10 µF. Boldface specifications apply over the TJ range of -40°C to +125°C.
Parameters
Sym.
Min.
Typ.
Max. Units Conditions
VIN Supply Voltage
Input Voltage
Quiescent Current
(Switching)
Quiescent Current
(Non-Switching)
Quiescent Current -
Shutdown
VIN
6.0
24 V
IQ
— 5.2
— mA IOUT = 0 mA
IQ
— 2.3
— mA Closed Loop in
Overvoltage
IOUT = 0 mA
IQ
—5
10 µA EN = 0
VIN Undervoltage Lockout
Undervoltage Lockout Start UVLOSTRT 5.5 5.75
Undervoltage Lockout
Hysteresis
UVLOHYS
— 0.65
6.0 V VIN Rising
— V Non-Switching
Output Characteristics
Maximum Output Current
MCP16321
IOUT
1
— A VIN = 6V to 24V
Maximum Output Current
MCP16322
IOUT
2
— A VIN = 6V to 24V
Output Voltage Adjust Range
Output Voltage Tolerance
in PWM Mode
VOUT
VOUT-PWM
0.9
VOUT - 2%
VOUT
5.0
VOUT + 2%
V
V IOUT = 1A
Output Voltage Tolerance
in PFM Mode
VOUT-PFM
VOUT - 1% VOUT + 1% VOUT + 3.5% V IOUT = 0A
Feedback Voltage
Feedback Reference
Tolerance
VFB
VFB-TOL
0.886
-1.5
0.9
0.914
1.5
V
%
PFM Mode Feedback
Comparator Threshold
VFB-PFM
— VOUT + 1%
V
Feedback Input Bias
Current
IFB
— 100
— nA
Note 1: Regulator SW pin is forced off for 240 ns every eight cycles to ensure the BOOST cap is replenished.
2011-2016 Microchip Technology Inc.
DS20002285B-page 3


MCP16322 Datasheet
High Efficiency Synchronous Buck Regulator

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MCP16321/2
DC CHARACTERISTICS (CONTINUED)
Electrical Characteristics: Unless otherwise indicated, TA = +25°C, VIN = 12V, VOUT = 3.3V, IOUT = 300 mA,
L = 4.7 µH, COUT = 2x22 µF, CIN = 2x10 µF. Boldface specifications apply over the TJ range of -40°C to +125°C.
Parameters
Sym.
Min.
Typ.
Max. Units Conditions
PFM Mode Feedback
VFB-PFM
— VOUT + 1%
V
EN Input Characteristics
EN Input Logic High
EN Input Logic Low
EN Input Hysteresis
EN Input Leakage Current
Soft-Start Time
VIH
VIL
VEN-HYST
IENLK
tSS
2.2
——
— 480
— 3.5
— -1.5
—4
—V
0.8 V
— mV
— µA VEN = 5V
— µA VEN = 0V
— ms
Switching Characteristics
Switching Frequency
fSW
0.9 1
1.1 MHz Open Loop VFB
Low
Maximum Duty Cycle
DCMAX
95 97
99 % Open Loop VFB
Low
Note 1
Minimum Duty Cycle
—7
—%
NMOS Low-Side
Switch On Resistance
Low-Side RDS(ON)
120
— m
NMOS High-Side
Switch On Resistance
NMOS High-Side
Switch Current Limit
High-Side — 180
RDS(ON)
IN(MAX)
1.4 1.8
2.4 2.8
— m
2.4 A MCP16321
3.4 A MCP16322
PG Output Characteristics
PG Low-level
Output Voltage
PG High-Level Output Leak-
age Current
PG Release Timer
VOUT Undervoltage Threshold
VOUT Undervoltage
Hysteresis
VOUT Overvoltage
Threshold
VOUT Overvoltage
Hysteresis
PGIL
— — 0.01
IPGLK
— 0.5
tPG
VOUT-UV
VOUT-UV_HYST
91% VOUT
10
93% VOUT
1.5% VOUT
95% VOUT
VOUT-OV
— 103% VOUT
VOUT-OV_HYST
— 1% VOUT
V IPG = -0.3 mA
µA VPG = 5V
ms
Thermal Characteristics
Thermal Shutdown
Die Temperature
TSD
— 170
— °C
Die Temperature
Hysteresis
TSDHYS
— 10
— °C
Note 1: Regulator SW pin is forced off for 240 ns every eight cycles to ensure the BOOST cap is replenished.
DS20002285B-page 4
2011-2016 Microchip Technology Inc.


MCP16322 Datasheet
High Efficiency Synchronous Buck Regulator

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MCP16321/2
TABLE 1-1: TEMPERATURE CHARACTERISTICS
Electrical Characteristics
Parameters
Sym. Min. Typ. Max. Units
Conditions
Temperature Ranges
Operating Junction Temperature
Range
TJ -40 — 125 °C Steady State
Storage Temperature Range
Maximum Junction Temperature
TA -65 — 150 °C
TJ
— 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 in2, 1 oz internal copper ground plane.
2011-2016 Microchip Technology Inc.
DS20002285B-page 5


MCP16322 datasheets pdf
Total : 30 Pages
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