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  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP16311 Datasheet

Integrated Synchronous Switch Step-Down Regulator

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MCP16311 pdf
MCP16311/2
30V Input, 1A Output, High-Efficiency,
Integrated Synchronous Switch Step-Down Regulator
Features
• Up to 95% Efficiency
• Input Voltage Range: 4.4V to 30V
• 1A Output Current Capability
• Output Voltage Range: 2.0V to 24V
• Qualification: AEC-Q100 Rev. G, Grade 1 (-40°C
to 125°C)
• Integrated N-Channel High-Side and Low-Side
Switches:
- 170 m, Low Side
- 300 m, High Side
• Stable Reference Voltage: 0.8V
• Automatic Pulse Frequency Modulation/Pulse-
Width Modulation (PFM/PWM) Operation
(MCP16311):
- PFM Operation Disabled (MCP16312)
- PWM Operation: 500 kHz
• Low Device Shutdown Current: 3 µA typical
• Low Device Quiescent Current:
- 44 µA (non-switching, PFM Mode)
• Internal Compensation
• Internal Soft-Start: 300 µs (EN low-to-high)
• Peak Current Mode Control
• Cycle-by-Cycle Peak Current Limit
• Undervoltage Lockout (UVLO):
- 4.1V typical to start
- 3.6V typical to stop
• Overtemperature Protection
• Thermal Shutdown:
- +150°C
- +25°C Hysteresis
Applications
• PIC®/dsPIC® Microcontroller Bias Supply
• 24V Industrial Input DC-DC Conversion
• General Purpose DC-DC Conversion
• Local Point of Load Regulation
• Automotive Battery Regulation
• Set-Top Boxes
• Cable Modems
• Wall Transformer Regulation
• Laptop Computers
• Networking Systems
• AC-DC Digital Control Bias
• Distributed Power Supplies
General Description
The MCP16311/2 is a compact, high-efficiency, fixed
frequency, synchronous step-down DC-DC converter in
an 8-pin MSOP, or 2 x 3 TDFN package that operates
from input voltage sources up to 30V. Integrated
features include a high-side and a low-side switch, fixed
frequency peak current mode control, internal
compensation, peak current limit and overtemperature
protection. The MCP16311/2 provides all the active
functions for local DC-DC conversion, with fast transient
response and accurate regulation.
High converter efficiency is achieved by integrating the
current-limited, low-resistance, high-speed high-side
and low-side switches and associated drive circuitry.
The MCP16311 is capable of running in PWM/PFM
mode. It switches in PFM mode for light load
conditions and for large buck conversion ratios. This
results in a higher efficiency over all load ranges. The
MCP16312 runs in PWM-only mode, and is
recommended for noise-sensitive applications.
The MCP16311/2 can supply up to 1A of continuous
current while regulating the output voltage from 2V to
12V. An integrated, high-performance peak current
mode architecture keeps the output voltage tightly
regulated, even during input voltage steps and output
current transient conditions common in power systems.
The EN input is used to turn the device on and off.
While off, only a few micro amps of current are
consumed from the input.
Output voltage is set with an external resistor divider.
The MCP16311/2 is offered in small MSOP-8 and 2 x 3
TDFN surface mount packages.
Package Type
MCP16311/2
MSOP
MCP16311/2
2x3 TDFN*
VFB 1
VCC 2
EN 3
VIN 4
8 AGND VFB 1
8 AGND
7 BOOST VCC 2 EP 7 BOOST
6 SW
EN 3 9 6 SW
5 PGND VIN 4
5 PGND
* Includes Exposed Thermal Pad (EP); see Table 3-1.
2013-2014 Microchip Technology Inc.
DS20005255B-page 1



  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP16311 Datasheet

Integrated Synchronous Switch Step-Down Regulator

No Preview Available !

MCP16311 pdf
MCP16311/2
Typical Applications
VIN
4.5V to 30V
CIN
2 x 10 µF
CVCC
1 µF
BOOST
SW
VIN
EN
VCC
VFB
GND
CBOOST
100 nF
L1
15 µH
VOUT
3.3V @ 1A
31.6 k
COUT
2 x 10 µF
10 k
Vin
6V to 30V
CIN
2 x 10 µF
CVCC
1 µF
BOOST
SW
VIN
EN
VCC
VFB
GND
C10B0OOnSFT22Lµ1 H
VOUT
5V, @ 1A
COUT
2 x 10 µF
52.3 k
10 k
100
90
80
70
60
50
40
30
20
10
0
1
VOUT = 5V
VOUT = 3.3V
VIN = 12V
PWM ONLY
PWM/PFM
10 100
IOUT (mA)
1000
DS20005255B-page 2
2013-2014 Microchip Technology Inc.



  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP16311 Datasheet

Integrated Synchronous Switch Step-Down Regulator

No Preview Available !

MCP16311 pdf
MCP16311/2
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings †
VIN, SW ............................................................... -0.5V to 32V
BOOST – GND ................................................... -0.5V to 38V
BOOST – SW Voltage........................................ -0.5V to 6.0V
VFB Voltage ........................................................ -0.5V to 6.0V
EN Voltage ............................................. -0.5V to (VIN + 0.3V)
Output Short-Circuit Current ................................. Continuous
Power Dissipation ....................................... Internally Limited
Storage Temperature ....................................-65°C to +150°C
Ambient Temperature with Power Applied ....-40°C to +125°C
Operating Junction Temperature...................-40°C to +150°C
ESD Protection on All Pins:
HBM ..................................................................... 1 kV
MM ......................................................................200V
† 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.
DC CHARACTERISTICS
Electrical Characteristics: Unless otherwise indicated, TA = +25°C, VIN = VEN = 7V, VBOOST - VSW = 5.0V,
VOUT = 5.0V, IOUT = 100 mA, L = 22 µH, COUT = CIN = 2 x 10 µF X7R Ceramic Capacitors.
Boldface specifications apply over the TA range of -40°C to +125°C.
Parameters
Sym.
Min.
Typ.
Max. Units
Conditions
VIN Supply Voltage
Input Voltage
Quiescent Current
Quiescent Current -
PFM Mode
Quiescent Current -
PWM Mode
Quiescent Current -
Shutdown
VIN Undervoltage Lockout
Undervoltage Lockout Start
Undervoltage Lockout Stop
Undervoltage Lockout
Hysteresis
VIN
IQ
IQ_PFM
IQ_PWM
IQ_SHDN
UVLOSTRT
UVLOSTOP
UVLOHYS
4.4
3.18
0.2
44
85
3.8
3
4.1
3.6
0.5
30 V Note 1
60 µA Nonswitching,
VFB = 0.9V
— µA Switching,
IOUT = 0 (MCP16311)
8 mA Switching,
IOUT = 0 (MCP16312)
9 µA VOUT = EN = 0V
4.4 V VIN Rising
— V VIN Falling
1V
Output Characteristics
Feedback Voltage
Output Voltage
Adjust Range
VFB
VOUT
0.784
2.0
0.800
0.816
24
V IOUT = 5 mA
V Note 2, Note 3
Feedback Voltage
Line Regulation
Feedback Voltage
Load Regulation
VFB/VFB)/VIN -0.15
VFB / VFB
0.01
0.25
0.15
%/V VIN = 7V to 30V,
IOUT = 50 mA
% IOUT = 5 mA to 1A,
MCP16312
Note 1:
2:
The input voltage should be greater than the output voltage plus headroom voltage; higher load currents
increase the input voltage necessary for regulation. See characterization graphs for typical input-to-output
operating voltage range.
For VIN < VOUT, VOUT will not remain in regulation; for output voltages above 12V, the maximum current
will be limited to under 1A.
3: Determined by characterization, not production tested.
4: This is ensured by design.
2013-2014 Microchip Technology Inc.
DS20005255B-page 3




Part Number MCP16311
Description Integrated Synchronous Switch Step-Down Regulator
Maker Microchip
Total Page 30 Pages
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