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MCP16301H Schematic ( PDF Datasheet ) - Microchip

Teilenummer MCP16301H
Beschreibung High-Voltage Input Integrated Switch Step-Down Regulator
Hersteller Microchip
Logo Microchip Logo 




Gesamt 30 Seiten
MCP16301H Datasheet, Funktion
MCP16301/H
High-Voltage Input Integrated Switch Step-Down Regulator
Features
• Up to 96% Typical Efficiency
• Input Voltage Range:
- 4.0V to 30V (MCP16301)
- 4.7V to 36V (MCP16301H)
• Output Voltage Range: 2.0V to 15V
• 2% Output Voltage Accuracy
• Qualification: AEC-Q100 Rev G, Grade 1
(-40°C to +125°C)
• Integrated N-Channel Buck Switch: 460 m
• Minimum 600 mA Output Current Over All Input
Voltage Range (See Figure 2-6 for Maximum
Output Current vs. VIN):
- up to 1A output current at 3.3V, 5V and 12V
VOUT, SOT-23 package at +25°C ambient
temperature
• 500 kHz Fixed Frequency
• Adjustable Output Voltage
• 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): 3.5V
• Overtemperature Protection
• Available Package: SOT-23-6
Applications
• PIC® Microcontroller and dsPIC® Digital Signal
Controller Bias Supply
• 24V 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
• D2 Package Linear Regulator Replacement
- See Figure 5-2
• Consumer
• Medical and Health Care
• Distributed Power Supplies
General Description
The MCP16301/H devices are highly integrated,
high-efficiency, fixed-frequency, step-down DC-DC
converters in a popular 6-pin SOT-23 package that
operates from input voltage sources up to 36V.
Integrated features include a high-side switch,
fixed-frequency peak current mode control, internal
compensation, peak current limit and overtemperature
protection. Minimal external components are
necessary to develop a complete step-down DC-DC
converter power supply.
High converter efficiency is achieved by integrating the
current-limited, low-resistance, high-speed N-Channel
MOSFET and associated drive circuitry. High
switching frequency minimizes the size of external
filtering components, resulting in a small solution size.
The MCP16301/H devices can supply 600 mA of
continuous current while regulating the output voltage
from 2.0V to 15V. An integrated, 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 systems.
The EN input is used to turn the device on and off.
While turned off, only a few micro amps of current are
consumed from the input for power shedding and load
distribution applications.
Output voltage is set with an external resistor divider.
The MCP16301/H devices are offered in a
space-saving SOT-23-6 surface mount package.
Package Type
MCP16301/H
6-Lead SOT-23
BOOST 1
GND 2
VFB 3
6 SW
5 VIN
4 EN
2011-2015 Microchip Technology Inc.
DS20005004D-page 1






MCP16301H Datasheet, Funktion
MCP16301/H
Note: Unless otherwise indicated, VIN = EN = 12V, COUT = CIN = 2 X 10 µF, L = 15 µH, VOUT = 3.3V, ILOAD = 200 mA,
TA = +25°C.
5
4
VOUT = 3.3V
3 IOUT = 0 mA
2
1
VIN = 6V
VIN = 12V
VIN = 30V
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
Ambient Temperature (°C)
FIGURE 2-7:
Temperature.
Input Quiescent Current vs.
1800
1600
1400
1200
1000
VIN = 30V
VIN = 12V
VIN = 6V
800
VOUT = 3.3V
600
-40 -25 -10 5 20 35 50 65 80 95 110 125
Ambient Temperature (°C)
FIGURE 2-10:
Peak Current Limit vs.
Temperature; VOUT = 3.3V.
505
500
495
490
VIN = 12V
VOUT = 3.3V
IOUT = 200 mA
485
480
475
470
465
460
455
-40 -20
0 20 40 60 80 100
Ambient Temperature (°C)
120
FIGURE 2-8:
Switching Frequency vs.
Temperature; VOUT = 3.3V.
510
500
490
480
470
460
450
440
430
420
3
FIGURE 2-11:
TA = 25°C
VDS = 100 mV
3.5 4 4.5
Boost Voltage (V)
5
Switch RDSON vs. VBOOST.
95.5
95.4
95.3
VIN = 5V
IOUT = 200 mA
95.2
95.1
95
94.9
94.8
94.7
-40 -25 -10 5 20 35 50 65 80 95 110 125
Ambient Temperature (°C)
FIGURE 2-9:
Maximum Duty Cycle vs.
Ambient Temperature; VOUT = 5.0V.
0.802
0.801
0.800
VIN = 12V
VOUT = 3.3V
IOUT = 100 mA
0.799
0.798
0.797
0.796
-40 -20
FIGURE 2-12:
VOUT = 3.3V.
0 20 40 60 80 100 120
Ambient Temperature (°C)
VFB vs. Temperature;
DS20005004D-page 6
2011-2015 Microchip Technology Inc.

6 Page









MCP16301H pdf, datenblatt
MCP16301/H
VIN
CIN
BG
REF
VREG
VOUT
SS OTEMP
VREF
Boost
Pre-
charge
500 kHz OSC
RTOP
RBOT
+
FB
Amp
-
-
Comp
+
RCOMP
Precharge
Overtemp
VREF CCOMP
EN +
-
SHDN all blocks
GND
S
PWM
Latch
R
HS
Drive
+
CS
+
RSENSE
Slope
Comp
BOOST Boost Diode
CBOOST
SW
Schottky
Diode
VOUT
COUT
GND
FIGURE 4-1:
MCP16301/H Block Diagram.
4.2 Functional Description
4.2.1
STEP-DOWN OR BUCK
CONVERTER
The MCP16301/H devices are non-synchronous
step-down or buck converters, capable of stepping
input voltages ranging from 4V to 30V (MCP16301) or
36V (MCP16301H) down to 2.0V to 15V for VIN > VOUT.
The integrated high-side switch is used to chop or
modulate the input voltage using a controlled duty cycle
for output voltage regulation. High efficiency is
achieved by using a low-resistance switch, low forward
drop diode, low equivalent series resistance (ESR), an
inductor and a capacitor. When the switch is turned on,
a DC voltage is applied to the inductor (VIN – VOUT),
resulting in a positive linear ramp of inductor current.
When the switch turns off, the applied inductor voltage
is equal to -VOUT, resulting in a negative linear ramp of
inductor current (ignoring the forward drop of the
Schottky diode).
For steady-state, continuous inductor current
operation, the positive inductor current ramp must
equal the negative current ramp in magnitude. While
operating in steady state, the switch duty cycle must be
equal to the relationship of VOUT/VIN for constant
output voltage regulation, under the condition that the
inductor current is continuous or never reaches zero.
For discontinuous inductor current operation, the
steady-state duty cycle will be less than VOUT/VIN to
maintain voltage regulation. The average of the
chopped input voltage or SW node voltage is equal to
the output voltage, while the average of the inductor
current is equal to the output current.
VIN
+
-
SW
Schottky
Diode
IL
L
VOUT
COUT
IL IOUT
0
VIN
SW VOUT
on off on off on
Continuous Inductor Current Mode
IL
0
IOUT
VIN
SW
on off on off on
Discontinuous Inductor Current Mode
FIGURE 4-2:
Step-Down Converter.
DS20005004D-page 12
2011-2015 Microchip Technology Inc.

12 Page





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