MIC4680
1A 200 kHz SuperSwitcher™ Buck Regulator
Features
General Description
•
•
•
•
•
•
The MIC4680 SuperSwitcher™ is an easy-to-use fixed
or adjustable output voltage step-down (buck)
switch-mode voltage regulator. The 200 kHz MIC4680
achieves up to 1.3A of continuous output current over
a wide input range in a 8-lead SOIC.
•
•
•
•
•
SOIC-8 Package with Up to 1.3A Output Current
All Surface Mount Solution
Only Four External Components Required
Fixed 200 kHz Operation
3.3V, 5V, and Adjustable Output Versions
Internally Compensated with Fast Transient
Response
Wide 4V to 34V Operating Input Voltage Range
Less than 2 µA Typical Shutdown Mode Current
Up to 90% Efficiency
Thermal Shutdown
Overcurrent Protection
Applications
• Simple 1A High-Efficiency Step-Down Regulator
• Replacement TO-220 and TO-263 Designs
• Efficient Pre-Regulator (5V to 2.5V, 12V to 3.3V,
etc.)
• On-Card Switching Regulators
• Positive-to-Negative Converter (Inverting
Buck-Boost)
• Simple Battery Charger
• Negative Boost Converter
• Higher Output Current Regulator using External
FET
2021 Microchip Technology Inc. and its subsidiaries
The MIC4680 is available in 3.3V and 5V fixed output
versions or adjustable output down to 1.25V.
The MIC4680 has an input voltage range of 4V to 34V,
with excellent line, load, and transient response. The
regulator performs cycle-by-cycle current limiting and
thermal shutdown for protection under fault conditions.
In shutdown mode, the regulator draws less than 2 μA
of standby current.
The MIC4680 SuperSwitcher regulator requires a
minimum number of external components and can
operate using a standard series of inductors and
capacitors. Frequency compensation is provided
internally for fast transient response and ease of use.
Package Type
MIC4680
8-Lead SOIC (M)
(Top View)
SHDN 1
8 GND
IN 2
7 GND
SW 3
6 GND
FB 4
5 GND
DS20006623A-page 1
MIC4680
Typical Application Circuits
Fixed Regulator Circuit
MIC4680-3.3YM
+6V to +34V
C1
15μF
35V
SHUTDOWN
2
1
ENABLE
IN
SHDN
SW
3
FB
4
L1
C2
220μF
16V
D1
B260A or
SS26
GND
Power
SOIC-8
3.3V/1A
68μH
5–8
Adjustable Regulator Circuit
+5V to +34V
C1
15μF
35V
SHUTDOWN
ENABLE
Power
SOIC-8
2
1
MIC4680YM
IN
SW
SHDN
FB
GND
5–8
L1
3
2.5V/1A
68μH
R1
3.01k
4
D1
B260A or
SS26
C2
220μF
16V
R2
2.94k
Functional Block Diagrams
Adjustable Version
Fixed Version
V IN
VIN
IN
SHDN
IN
SHDN
Internal
Regulator
200kHz
Oscillator
Thermal
Shutdown
Current
Limit
Internal
Regulator
200kHz
Oscillator
Thermal
Shutdown
VOUT = VREF
R1 = R2
Current
Limit
R1
+ 1)
( R2
( VVOUT - 1)
REF
VREF = 1.23V
Comparator
SW
Driver
Reset
VOUT
Comparator
VOUT
SW
Driver
1A
Switch
COUT
Reset
1A
Switch
COUT
FB
R1
FB
Error
Amp
1.23V
Bandgap
Reference
MIC4680-x.x
Error
Amp
1.23V
Bandgap
Reference
R2
MIC4680 [adj.]
GND
DS20006623A-page 2
2021 Microchip Technology Inc. and its subsidiaries
MIC4680
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
Supply Voltage (VIN; Note 1) .....................................................................................................................................+38V
Shutdown Voltage (VSHDN) ........................................................................................................................ –0.3V to +38V
Steady-State Output Switch Voltage (VSW).................................................................................................................–1V
Feedback Voltage (Adjustable Version; VFB) ............................................................................................................+12V
ESD Rating ............................................................................................................................................................ Note 2
Operating Ratings ‡
Supply Voltage (VIN; Note 3) ......................................................................................................................... +4V to +34V
† 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.
‡ Notice: The device is not guaranteed to function outside its operating rating.
Note 1: Absolute maximum rating is intended for voltage transients only, prolonged DC operation is not recommended.
2: Devices are ESD sensitive. Handling precautions are recommended.
3: VIN(MIN) = VOUT + 2.5V or 4V, whichever is greater.
ELECTRICAL CHARACTERISTICS
Electrical Characteristics: VIN = 12V; ILOAD = 500 mA; TJ = +25°C, bold values valid for –40°C to +125°C, unless
noted. (Note 1)
Parameter
Symbol
Min.
Typ.
Max.
Units
Conditions
1.217
1.230
1.243
1.205
—
1.255
1.193
1.230
1.267
1.180
—
1.280
93
97
—
%
VFB = 1.0V
—
50
500
µA
VIN = 34V, VSHDN = 5V, VSW = 0V
—
4
20
mA
VIN = 34V, VSHDN = 5V, VSW = –1V
—
7
12
mA
VFB = 1.5V
3.266
3.3
3.333
3.201
—
3.399
3.168
3.3
3.432
3.135
—
3.465
93
97
—
%
VFB = 2.5V
—
50
500
µA
VIN = 34V, VSHDN = 5V, VSW = 0V
—
4
20
mA
VIN = 34V, VSHDN = 5V, VSW = –1V
MIC4680 Adjustable Voltage Version
Feedback Voltage
Maximum Duty Cycle
VFB
DCMAX
Output Leakage Current
IOZ
Quiescent Current
IQ
±1%
V
±1%
8V ≤ VIN ≤ 34V, 0.1A ≤ ILOAD ≤ 1A,
VOUT = 5V
MIC4680-3.3
Output Voltage
Maximum Duty Cycle
Output Leakage Current
Note 1:
VOUT
DCMAX
IOZ
±1%
V
±3%
6V ≤ VIN ≤ 34V, 0.1A ≤ ILOAD ≤ 1A
Test at TA = +85°C, ensured by design, and characterized to TJ = +125°C.
2021 Microchip Technology Inc. and its subsidiaries
DS20006623A-page 3
MIC4680
ELECTRICAL CHARACTERISTICS (CONTINUED)
Electrical Characteristics: VIN = 12V; ILOAD = 500 mA; TJ = +25°C, bold values valid for –40°C to +125°C, unless
noted. (Note 1)
Parameter
Symbol
Min.
Typ.
Max.
Units
IQ
—
7
12
mA
4.950
5.0
5.05
4.85
—
5.15
4.800
5.0
5.200
4.750
—
5.250
93
97
—
%
VFB = 4.0V
—
50
500
µA
VIN = 34V, VSHDN = 5V, VSW = 0V
—
4
20
mA
VIN = 34V, VSHDN = 5V, VSW = –1V
Quiescent Current
Conditions
VFB = 4.0V
MIC4680-5.0
Output Voltage
VOUT
Maximum Duty Cycle
DCMAX
±1%
V
±3%
8V ≤ VIN ≤ 34V, 0.1A ≤ ILOAD ≤ 1A
Output Leakage Current
IOZ
Quiescent Current
IQ
—
7
12
mA
VFB = 6.0V
Frequency Fold Back
—
30
50
100
kHz
—
Oscillator Frequency
fOSC
180
200
220
kHz
—
Saturation Voltage
VSAT
—
1.4
1.8
V
IOUT = 1A
Short-Circuit Current Limit
ISC
1.3
1.8
2.5
A
VFB = 0V, see Figure 1-1
Standby Quiescent Current
ISTBY
—
1.5
—
µA
VSHDN = VIN
—
30
100
µA
VSHDN = 5V (regulator off)
Shutdown Input Logic Level
VSHDN
2
1.6
—
—
1.0
0.8
Shutdown Input Current
ISHDN
–10
–0.5
10
–10
–1.5
10
Thermal Shutdown
TSHDN
—
160
—
MIC4680-3.3 and MIC4680-5.0
Note 1:
V
µA
°C
Regulator off
Regulator on
VSHDN = 5V (regulator off)
VSHDN = 0V (regulator on)
—
Test at TA = +85°C, ensured by design, and characterized to TJ = +125°C.
Test Circuit
+12V
SHUTDOWN
ENABLE
Device Under Test
2
IN
1
SHDN
SW
3
FB
4
68μH
I
GND
SOIC-8
FIGURE 1-1:
DS20006623A-page 4
5–8
Current Limit Test Circuit.
2021 Microchip Technology Inc. and its subsidiaries
MIC4680
Shutdown Input Behavior
OFF
ON
0.8V
0V
FIGURE 1-2:
2V
1V
1.6V
VIN(max)
Shutdown Hysteresis.
TEMPERATURE SPECIFICATIONS
Parameters
Sym.
Min.
Typ.
Max.
Units
Conditions
Maximum Junction Temperature Range TJ(MAX)
–40
—
+125
°C
—
Operating Temperature Range
TJ
–40
—
+125
°C
—
Storage Temperature Range
TS
–65
—
+150
°C
—
θJA
—
63
—
°C/W
—
Temperature Ranges
Package Thermal Resistance
Thermal Resistance, SOIC 8-Lead
Note 1:
The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable
junction temperature and the thermal resistance from junction to air (i.e., TA, TJ, JA). Exceeding the
maximum allowable power dissipation will cause the device operating junction temperature to exceed the
maximum rating. Sustained junction temperatures above that maximum can impact device reliability.
2021 Microchip Technology Inc. and its subsidiaries
DS20006623A-page 5
MIC4680
2.0
Note:
TYPICAL OPERATING CHARACTERISTICS
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.
4.0
IOUT = 1.0A
5.05
5.04
5.03
5.02
5.01
5.00
4.99
4.98
4.97
4.96
3.0
2.5
2.0
1.5
1.0
0.5
0
5
FIGURE 2-1:
10 15 20 25 30
INPUT VOLTAGE (V)
0
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
35
FIGURE 2-4:
Temperature.
Line Regulation.
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
VIN = 12V
VOUT = 5V
5.02
5.00
4.98
0
4
3
2
1
VIN = 12V
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8
OUTPUT CURRENT (A)
FIGURE 2-5:
Load Regulation.
Current Limit Characteristic.
202
100
201
FREQUENCY (kHz)
80
CURRENT (μA)
5
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4
OUTPUT CURRENT (A)
FIGURE 2-2:
60
40
20
0
Shutdown Current vs.
6
5.04
4.96
VIN = 12V
VSHDN = VIN
3.5
CURRENT (μA)
OUTPUT VOLTAGE (V)
5.06
200
199
198
197
0
5
FIGURE 2-3:
Voltage.
DS20006623A-page 6
10 15 20 25 30
INPUT VOLTAGE (V)
35
Shutdown Current vs. Input
196
FIGURE 2-6:
Voltage.
0
5 10 15 20 25 30
SUPPLY VOLTAGE (V)
35
Frequency vs. Supply
2021 Microchip Technology Inc. and its subsidiaries
MIC4680
80
220
EFFICIENCY (%)
FREQUENCY (kHz)
70
210
200
190
60
24V 6V
12V
50
40
30
20
10
180
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
FIGURE 2-7:
Frequency vs. Temperature.
0
FIGURE 2-10:
1.236
1.234
1.232
VIN = 12V
VOUT = 5V
IOUT = 1A
1.230
EFFICIENCY (%)
FEEDBACK VOLTAGE (V)
80
1.238
Feedback Voltage vs.
0.2
VIN = 12V
VOUT = 5V
ILOAD = 1A
0
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
FIGURE 2-9:
Temperature.
Saturation Voltage vs.
2021 Microchip Technology Inc. and its subsidiaries
24V
50
40
30
20
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4
OUTPUT CURRENT (A)
EFFICIENCY (%)
SATURATION VOLTAGE (V)
0.8
12V
FIGURE 2-11:
1.4
1.0
7V
60
0
1.6
1.2
70
10
1.228
-50 -25 0 25 50 75 100 125 150
TEMPERATURE (°C)
0.4
3.3V Output Efficiency.
90
1.240
0.6
0.2 0.4 0.6 0.8 1.0 1.2 1.4
OUTPUT CURRENT (A)
1.242
FIGURE 2-8:
Temperature.
0
100
90
80
70
60
5V Output Efficiency.
15V
24V
50
40
30
20
10
0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
OUTPUT CURRENT (A)
FIGURE 2-12:
12V Output Efficiency.
DS20006623A-page 7
MIC4680
1.5
Minimum
Current Limit
1.4
1.3
1.2
Note
OUTPUT CURRENT (A)
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
VOUT = 5V
TA = 60°C
Demonstration
board layout
0.3
0.2
0.1
0
0
5
FIGURE 2-13:
Safe Operating Area.
FIGURE 2-14:
Foldback.
Switching Frequency
2.1
10
15
20
25
INPUT VOLTAGE (V)
30
FIGURE 2-15:
35
Load Transient.
Frequency Foldback
The MIC4680 folds the switching frequency back
during a hard short-circuit condition to reduce the
energy per cycle and protect the device.
DS20006623A-page 8
2021 Microchip Technology Inc. and its subsidiaries
MIC4680
2.2
Bode Plots
The following bode plots show that the MIC4680 is stable over all conditions using a 68 μF inductor (L) and a 220 μF
output capacitor (COUT). To ensure stability, it is a good practice to maintain a phase margin of greater than 35°.
FIGURE 2-16:
Margin = 106°.
No-Load Stability, Phase
FIGURE 2-19:
Margin = 69°.
Full-Load Stability, Phase
FIGURE 2-17:
Margin = 114°.
Full-Load Stability, Phase
FIGURE 2-20:
Margin = 125°.
No-Load Stability, Phase
FIGURE 2-18:
Margin = 117°.
No-Load Stability, Phase
FIGURE 2-21:
Margin = 71°.
Full-Load Stability, Phase
2021 Microchip Technology Inc. and its subsidiaries
DS20006623A-page 9
MIC4680
3.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
PIN FUNCTION TABLE
Pin Number Pin Name
Description
1
SHDN
2
VIN
Supply Voltage (Input): Unregulated +4V to +34V supply voltage.
3
SW
Switch (Output): Emitter of NPN output switch. Connect to external storage inductor and
Schottky diode.
4
FB
Feedback (Input): Connect to output on fixed output voltage versions, or to 1.23V tap of
voltage-divider network for adjustable version.
5, 6, 7, 8
GND
DS20006623A-page 10
Shutdown (Input): Logic low enables regulator. Logic high (>1.6V) shuts down regulator.
Ground.
2021 Microchip Technology Inc. and its subsidiaries
MIC4680
4.0
FUNCTIONAL DESCRIPTION
The MIC4680 is a variable duty cycle switch-mode
regulator with an internal power switch. Refer to the
Functional Block Diagrams.
4.1
Supply Voltage
The MIC4680 operates from a +4V to +34V
unregulated input. Highest efficiency operation is from
a supply voltage around +15V. See Figure 2-10
through Figure 2-12.
4.2
Enable/Shutdown
The shutdown (SHDN) input is TTL compatible.
Ground the input if unused. A logic low enables the
regulator. A logic high shuts down the internal regulator
which reduces the current to typically 1.5 μA when
VSHDN = VIN = 12V and 30 μA when VSHDN = 5V. See
Figure 1-2.
4.3
Feedback
Fixed-voltage versions of the regulator have an internal
resistive divider from the feedback (FB) pin. Connect
FB directly to the output voltage.
Adjustable versions require an external resistive
voltage divider from the output voltage to ground,
center tapped to the FB pin. See Table 5-1 for
recommended resistor values.
4.4
4.5
Output Switching
When the internal switch is on, an increasing current
flows from the supply VIN, through external storage
inductor L1, to output capacitor COUT and the load.
Energy is stored in the inductor as the current
increases with time.
When the internal switch is turned off, the collapse of
the magnetic field in L1 forces current to flow through
fast recovery diode D1, charging COUT.
4.6
Output Capacitor
External output capacitor COUT provides stabilization
and reduces ripple. See the Bode Plots for additional
information.
4.7
Return Paths
During the ON portion of the cycle, the output capacitor
and load currents return to the supply ground. During
the OFF portion of the cycle, current is being supplied
to the output capacitor and load by storage inductor L1,
which means that D1 is part of the high-current return
path.
Duty Cycle Control
A fixed-gain error amplifier compares the feedback
signal with a 1.23V bandgap voltage reference. The
resulting error amplifier output voltage is compared to a
200 kHz sawtooth waveform to produce a
voltage-controlled variable duty cycle output.
A higher feedback voltage increases the error amplifier
output voltage. A higher error amplifier voltage
(comparator inverting input) causes the comparator to
detect only the peaks of the sawtooth, reducing the
duty cycle of the comparator output. A lower feedback
voltage increases the duty cycle. The MIC4680 uses a
voltage mode control architecture.
2021 Microchip Technology Inc. and its subsidiaries
DS20006623A-page 11
MIC4680
5.0
APPLICATIONS INFORMATION
5.1
Adjustable Regulators
V IN
Adjustable regulators require a 1.23V feedback signal.
Recommended voltage-divider resistor values for
common output voltages are included in Table 5-1.
2
MIC4680YM
IN
SW
R1
CIN
SHUTDOWN
ENABLE
1
SHDN
FB
GND
For other voltages, the resistor values can be
determined using the following formulas.
VOUT
L1
3
4
COUT
D1
R2
5–8
EQUATION 5-1:
R1
V OUT = V REF ------- + 1
R2
EQUATION 5-2:
V OUT
R1 = R2 ------------–1
V
REF
R1
R2 = --------------------------------------V OUT V REF – 1
Where:
VREF = 1.23V
TABLE 5-1:
VOUT
R1
RECOMMENDED COMPONENTS FOR COMMON OUTPUT VOLTAGES
12
R21 2
1.8V
3.01 kΩ
6.495 kΩ
2.5V
3.01 kΩ
2.915 kΩ
3.3V
3.01 kΩ
1.788 kΩ
5.0V
3.01 kΩ
982Ω
6.0V
3.01 kΩ
776Ω
Note 1:
2:
3:
CIN
15 μF 35V
T495X156K035ATE
200
D1
L1
2A 60V Schottky
B260A
Vishay-Diode, Inc
or
SS26 General
Semiconductor
COUT
68 μH 1.5A
Coiltronics
UP2B-680
or
220 μF 10V
Sumida
T495X227K010ATE
CDRH125-680MC3
060
or
Sumida
CDRH124-680MC3
All resistors 1%.
Nearest available resistor values.
Shielded magnetics for low-RFI applications.
DS20006623A-page 12
2021 Microchip Technology Inc. and its subsidiaries
MIC4680
5.2
Thermal Considerations
The MIC4680 SuperSwitcher features the power
SOIC-8. This package has a standard 8-pin
small-outline package profile but with much higher
power dissipation than a standard SOIC-8. The
MIC4680 SuperSwitcher is the first DC-to-DC
converter to take full advantage of this package.
The reason that the power SOIC-8 has higher power
dissipation (lower thermal resistance) is that pins 5
though 8 and the die-attach paddle are a single piece
of metal. The die is attached to the paddle with
thermally conductive adhesive. This provides a low
thermal resistance path from the junction of the die to
the ground pins. This design significantly improves
package power dissipation by allowing excellent heat
transfer through the ground leads to the printed circuit
board.
One of the limitation of the maximum output current on
any MIC4680 design is the junction-to-ambient thermal
resistance (θJA) of the design (package and ground
plane).Examining θJA in more detail:
EQUATION 5-3:
JA = JC + CA
Where:
θJC = Junction-to-case thermal resistance.
θCA = Case-to-ambient thermal resistance.
SOIC-8
JA
JC
FIGURE 5-1:
Section.
5.3.2
Power SOIC-8 Cross
MINIMUM COPPER/MAXIMUM
CURRENT METHOD
Using Figure 5-2, for a given input voltage range,
determine the minimum ground-plane heat-sink area
required for the application’s maximum output current.
Figure 5-2 assumes a constant die temperature of
75°C above ambient.
1.5
θJA is ideally 63°C/W but will vary depending on the
size of the ground plane to which the power SOIC-8 is
attached.
5.3
Determining Ground-Plane
Heat-Sink Area
There are two methods of determining the minimum
ground plane area required by the MIC4680.
5.3.1
QUICK METHOD
OUTPUT CURRENT (I)
θCA is dependent on layout and is primarily governed
by the connection of pins 5 though 8 to the ground
plane. The purpose of the ground plane is to function
as a heat sink.
Ground Plane
Sink Area
AM
Heat
BIE
NT
Printed Circuit Board
8V
θJC is a relatively constant 20°C/W for a power SOIC-8.
CA
1.0
12V
24V
34V
TA = 50°C
0.5
Minimum Current Limit = 1.3A
0
0
5
10
15
20
25
AREA (cm 2)
FIGURE 5-2:
Plane Area.
Output Current vs. Ground
When designing with the MIC4680, it is a good practice
to connect pins 5 through 8 to the largest ground plane
that is practical for the specific design.
Make sure that MIC4680 pins 5 though 8 are
connected to a ground plane with a minimum area of
6cm2. This ground plane should be as close to the
MIC4680 as possible. The area maybe distributed in
any shape around the package or on any PCB layer as
long as there is good thermal contact to pins 5 though
8. This ground plane area is more than sufficient for
most designs.
2021 Microchip Technology Inc. and its subsidiaries
DS20006623A-page 13
MIC4680
5.4
Checking the Maximum Junction
Temperature
For this example, with an output power (POUT) of 5W,
(5V output at 1A maximum with VIN = 12V) and 65°C
maximum ambient temperature, what is the maximum
junction temperature?
Referring to Figure 2-11, read the efficiency (η) for 1A
output current at VIN = 12V or perform you own
measurement.
η = 79%
5.5
Increasing the Maximum Output
Current
The maximum output current at high input voltages can
be increased for a given board layout. The additional
three components shown in Figure 5-3 will reduce the
overall loss in the MIC4680 by about 20% at high VIN
and high IOUT.
Even higher output current can be achieved by using
the MIC4680 to switch an external FET. See Figure 5-7
for a 5A supply with current limiting.
The efficiency is used to determine how much of the
output power (POUT) is dissipated in the regulator
circuit (PD).
MIC4680YM
IN
SW
EQUATION 5-4:
3
D1
1N4148
SHDN
P OUT
– P OUT
P D = ------------
FB
2.2nF
GND
5 6 7 8
5W
P D = ---------- – 5W = 1.33W
0.79
Calculate the worst-case junction temperature:
FIGURE 5-3:
Increasing Maximum Output
Current at High Input Voltages.
EQUATION 5-5:
5.6
Where:
TJ = Junction temperature.
PD(IC) = The MIC4680 power dissipation.
θJC = Junction-to-case thermal resistance (approx.
20°C/W for the MIC4680).
TC = Pin temperature measurement taken at the
entry point of pin 6 or 7 into the plastic package at the
ambient temperature at which TC is measured.
TA = Ambient temperature at which TC is measured.
TA(MAX) = Maximum ambient operating temperature
for the specific design.
Calculating the maximum junction temperature given a
maximum ambient temperature of 65°C:
Layout is very important when designing any switching
regulator. Rapidly changing switching currents through
the printed circuit board traces and stray inductance
can generate voltage transients which can cause
problems.
To minimize stray inductance and ground loops, keep
trace lengths, indicated by the heavy lines in
Figure 5-4, as short as possible. For example, keep D1
close to Pin 3 and Pins 5 through 8, keep L1 away from
sensitive node FB, and keep CIN close to Pin 2 and
Pins 5 though 8. See Thermal Considerations for
ground plane layout.
The feedback pin should be kept as far way from the
switching elements (usually L1 and D1) as possible.
V IN
+4V to +34V
EQUATION 5-6:
CIN
T J = 1.064 20C/W + 45C – 25C + 65C
T J = 106.3C
This value is less than the allowable maximum
operating junction temperature of 125°C as listed in the
Operating Ratings ‡. Typical thermal shutdown is
160°C and is listed in the Electrical Characteristics
table.
DS20006623A-page 14
MIC4680YM
2
IN
SW
3
FB
4
L1
VOUT
68μH
COUT
1
SHDN
Power
SOIC-8
D1
GND
R1
R2
Load
T J = P D IC JC + T C – T A + T A MAX
Layout Considerations
5 6 7 8
GND
FIGURE 5-4:
Critical Traces for Layout.
2021 Microchip Technology Inc. and its subsidiaries
MIC4680
5.7
Application Circuits
J1
+34V max.
MIC4680YM
FIGURE 5-5:
Constant Current and Constant Voltage Battery Charger.
MIC4680YM
FIGURE 5-6:
+12V to –12V/150 mA Buck-Boost Converter.
+4.5V to +17V
U1 MIC4680YM MIC4417YM4
2
1
IN
SHDN
SW
3
FB
4
Si4425DY
3.3V/5A
GND
SOIC-8
5–8
* I SAT = 8A
GND
FIGURE 5-7:
5V to 3.3V/5A Power Supply.
2021 Microchip Technology Inc. and its subsidiaries
DS20006623A-page 15
MIC4680
6.0
PACKAGING INFORMATION
6.1
Package Marking Information
8-Lead SOIC*
Example
(Fixed)
XXXX
-X.XXX
WNNN
8-Lead SOIC*
4680
-3.3YM
8217
Example
(Adjustable)
XXX
XXXXXX
WNNN
Legend: XX...X
Y
YY
WW
NNN
e3
*
MIC
4680YM
7128
Product code or customer-specific information
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
Pb-free JEDEC® designator for Matte Tin (Sn)
This package is Pb-free. The Pb-free JEDEC designator ( e3 )
can be found on the outer packaging for this package.
●, ▲, ▼ Pin one index is identified by a dot, delta up, or delta down (triangle
mark).
Note:
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information. Package may or may not include
the corporate logo.
Underbar (_) and/or Overbar (‾) symbol may not be to scale.
DS20006623A-page 16
2021 Microchip Technology Inc. and its subsidiaries
MIC4680
8-Lead SOIC Package Outline and Recommended Land Pattern
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging.
2021 Microchip Technology Inc. and its subsidiaries
DS20006623A-page 17
MIC4680
NOTES:
DS20006623A-page 18
2021 Microchip Technology Inc. and its subsidiaries
MIC4680
APPENDIX A:
REVISION HISTORY
Revision A (November 2021)
• Converted Micrel document MIC4680 to Microchip data sheet template DS20006623A.
• Minor grammatical text changes throughout.
2021 Microchip Technology Inc. and its subsidiaries
DS20006623A-page 19
MIC4680
NOTES:
DS20006623A-page 20
2021 Microchip Technology Inc. and its subsidiaries
MIC4680
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, contact your local Microchip representative or sales office.
Device
-X.X
X
X
-XX
Part No.
Output
Voltage
Temperature
Range
Package
Media Type
Device:
MIC4680:
1A 200 kHz SuperSwitcher™ Buck
Regulator
Output
Voltage:
= Adjustable
3.3 =
3.3V
5.0 =
5.0V
Temperature
Range:
Y
=
–40°C to +125°C
Package:
M
=
8-Lead SOIC
Media Type:
= 95/Tube
TR =
2,500/Reel
Examples:
a) MIC4680YM:
MIC4680, Adjustable Output
Voltage, –40°C to +125°C
Temp. Range, 8-Lead
SOIC, 95/Tube
b) MIC4680-3.3YM-TR:
MIC4608, 3.3V Output
Voltage, –40°C to +125°C
Temp. Range, 8-Lead SOIC,
2,500/Reel
c) MIC4680-5.0YM-TR:
MIC4680, 5.0V Output
Voltage, –40°C to +125°C
Temp. Range, 8-Lead SOIC,
2,500/Reel
Note 1:
2021 Microchip Technology Inc. and its subsidiaries
Tape and Reel identifier only appears in the
catalog part number description. This identifier is
used for ordering purposes and is not printed on
the device package. Check with your Microchip
Sales Office for package availability with the
Tape and Reel option.
DS20006623A-page 21
MIC4680
NOTES:
DS20006623A-page 22
2021 Microchip Technology Inc. and its subsidiaries
Note the following details of the code protection feature on Microchip products:
•
Microchip products meet the specifications contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is secure when used in the intended manner, within operating specifications, and
under normal conditions.
•
Microchip values and aggressively protects its intellectual property rights. Attempts to breach the code protection features of
Microchip product is strictly prohibited and may violate the Digital Millennium Copyright Act.
•
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of its code. Code protection does not
mean that we are guaranteeing the product is “unbreakable”. Code protection is constantly evolving. Microchip is committed to
continuously improving the code protection features of our products.
This publication and the information herein may be used only
with Microchip products, including to design, test, and integrate
Microchip products with your application. Use of this information in any other manner violates these terms. Information
regarding device applications is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your
specifications. Contact your local Microchip sales office for
additional support or, obtain additional support at https://
www.microchip.com/en-us/support/design-help/client-supportservices.
THIS INFORMATION IS PROVIDED BY MICROCHIP "AS IS".
MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED,
WRITTEN OR ORAL, STATUTORY OR OTHERWISE,
RELATED TO THE INFORMATION INCLUDING BUT NOT
LIMITED TO ANY IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTABILITY, AND FITNESS FOR A
PARTICULAR PURPOSE, OR WARRANTIES RELATED TO
ITS CONDITION, QUALITY, OR PERFORMANCE.
IN NO EVENT WILL MICROCHIP BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL, OR CONSEQUENTIAL LOSS, DAMAGE, COST, OR EXPENSE OF ANY
KIND WHATSOEVER RELATED TO THE INFORMATION OR
ITS USE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS
BEEN ADVISED OF THE POSSIBILITY OR THE DAMAGES
ARE FORESEEABLE. TO THE FULLEST EXTENT
ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON
ALL CLAIMS IN ANY WAY RELATED TO THE INFORMATION
OR ITS USE WILL NOT EXCEED THE AMOUNT OF FEES, IF
ANY, THAT YOU HAVE PAID DIRECTLY TO MICROCHIP
FOR THE INFORMATION.
Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to
defend, indemnify and hold harmless Microchip from any and
all damages, claims, suits, or expenses resulting from such
use. No licenses are conveyed, implicitly or otherwise, under
any Microchip intellectual property rights unless otherwise
stated.
Trademarks
The Microchip name and logo, the Microchip logo, Adaptec,
AnyRate, AVR, AVR logo, AVR Freaks, BesTime, BitCloud,
CryptoMemory, CryptoRF, dsPIC, flexPWR, HELDO, IGLOO,
JukeBlox, KeeLoq, Kleer, LANCheck, LinkMD, maXStylus,
maXTouch, MediaLB, megaAVR, Microsemi, Microsemi logo,
MOST, MOST logo, MPLAB, OptoLyzer, PIC, picoPower,
PICSTART, PIC32 logo, PolarFire, Prochip Designer, QTouch,
SAM-BA, SenGenuity, SpyNIC, SST, SST Logo, SuperFlash,
Symmetricom, SyncServer, Tachyon, TimeSource, tinyAVR, UNI/O,
Vectron, and XMEGA are registered trademarks of Microchip
Technology Incorporated in the U.S.A. and other countries.
AgileSwitch, APT, ClockWorks, The Embedded Control Solutions
Company, EtherSynch, Flashtec, Hyper Speed Control, HyperLight
Load, IntelliMOS, Libero, motorBench, mTouch, Powermite 3,
Precision Edge, ProASIC, ProASIC Plus, ProASIC Plus logo, QuietWire, SmartFusion, SyncWorld, Temux, TimeCesium, TimeHub,
TimePictra, TimeProvider, TrueTime, WinPath, and ZL are
registered trademarks of Microchip Technology Incorporated in the
U.S.A.
Adjacent Key Suppression, AKS, Analog-for-the-Digital Age, Any
Capacitor, AnyIn, AnyOut, Augmented Switching, BlueSky,
BodyCom, CodeGuard, CryptoAuthentication, CryptoAutomotive,
CryptoCompanion, CryptoController, dsPICDEM, dsPICDEM.net,
Dynamic Average Matching, DAM, ECAN, Espresso T1S,
EtherGREEN, GridTime, IdealBridge, In-Circuit Serial
Programming, ICSP, INICnet, Intelligent Paralleling, Inter-Chip
Connectivity, JitterBlocker, Knob-on-Display, maxCrypto, maxView,
memBrain, Mindi, MiWi, MPASM, MPF, MPLAB Certified logo,
MPLIB, MPLINK, MultiTRAK, NetDetach, NVM Express, NVMe,
Omniscient Code Generation, PICDEM, PICDEM.net, PICkit,
PICtail, PowerSmart, PureSilicon, QMatrix, REAL ICE, Ripple
Blocker, RTAX, RTG4, SAM-ICE, Serial Quad I/O, simpleMAP,
SimpliPHY, SmartBuffer, SmartHLS, SMART-I.S., storClad, SQI,
SuperSwitcher, SuperSwitcher II, Switchtec, SynchroPHY, Total
Endurance, TSHARC, USBCheck, VariSense, VectorBlox, VeriPHY,
ViewSpan, WiperLock, XpressConnect, 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.
The Adaptec logo, Frequency on Demand, Silicon Storage
Technology, Symmcom, and Trusted Time are registered
trademarks of Microchip Technology Inc. in other countries.
GestIC is a registered trademark of Microchip Technology Germany
II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in
other countries.
All other trademarks mentioned herein are property of their
respective companies.
© 2021, Microchip Technology Incorporated and its subsidiaries.
All Rights Reserved.
For information regarding Microchip’s Quality Management Systems,
please visit www.microchip.com/quality.
2021 Microchip Technology Inc. and its subsidiaries
ISBN: 978-1-5224-9353-2
DS20006623A-page 23
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DS20006623A-page 24
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09/14/21
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