MIC4420BMM [MICREL]
6A-Peak Low-Side MOSFET Driver Bipolar/CMOS/DMOS Process; 6A峰值低侧MOSFET驱动器双极/ CMOS / DMOS工艺
| 型号： | MIC4420BMM |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | 6A-Peak Low-Side MOSFET Driver Bipolar/CMOS/DMOS Process |
| 文件： | 总10页 (文件大小：99K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC4420/4429
6A-Peak Low-Side MOSFET Driver
Bipolar/CMOS/DMOS Process
General Description
Features
• CMOS Construction
• Latch-Up Protected: Will Withstand >500mA
Reverse Output Current
• Logic Input Withstands Negative Swing of Up to 5V
• Matched Rise and Fall Times................................25ns
• High Peak Output Current ............................... 6A Peak
• Wide Operating Range...............................4.5V to 18V
• High Capacitive Load Drive........................... 10,000pF
• Low Delay Time .............................................55ns Typ
MIC4420, MIC4429 and MIC429 MOSFET drivers are
tough, efficient, and easy to use. The MIC4429 and MIC429
are inverting drivers, while the MIC4420 is a non-inverting
driver.
They are capable of 6A (peak) output and can drive the
largest MOSFETs with an improved safe operating mar-
gin. The MIC4420/4429/429 accepts any logic input from
2.4V to V without external speed-up capacitors or resistor
S
networks. Proprietary circuits allow the input to swing
negative by as much as 5V without damaging the part.
Additional circuits protect against damage from electro-
static discharge.
• Logic High Input for Any Voltage From 2.4V to V
S
• Low Equivalent Input Capacitance (typ)................. 6pF
• Low Supply Current.............. 450µA With Logic 1 Input
• Low Output Impedance ......................................... 2.5Ω
• Output Voltage Swing Within 25mV of Ground or V
S
MIC4420/4429/429 drivers can replace three or more dis-
crete components, reducing PCB area requirements,
simplifying product design, and reducing assembly cost.
Applications
• Switch Mode Power Supplies
• Motor Controls
• Pulse Transformer Driver
• Class-D Switching Amplifiers
Modern BiCMOS/DMOS construction guarantees freedom
from latch-up. The rail-to-rail swing capability insures ad-
equate gate voltage to the MOSFET during power up/
down sequencing.
Functional Diagram
VS
MIC4429
INVERTING
0.4mA
0.1mA
OUT
IN
2kΩ
MIC4420
NON-INVERTING
GND
5-32
April 1998
MIC4420/4429
Micrel
Ordering Information
Part No.
MIC4420CN
MIC4420BN
MIC4420CM
MIC4420BM
MIC4420BMM
MIC4420CT
MIC4429CN
MIC4429BN
MIC4429CM
MIC4429BM
MIC4429BMM
MIC4429CT
Temperature Range
Package
8-Pin PDIP
8-Pin PDIP
8-Pin SOIC
8-Pin SOIC
8-Pin MSOP
5-Pin TO-220
8-Pin PDIP
8-Pin PDIP
8-Pin SOIC
8-Pin SOIC
8-Pin MSOP
5-Pin TO-220
Configuration
Non-Inverting
Non-Inverting
Non-Inverting
Non-Inverting
Non-Inverting
Non-Inverting
Inverting
0°C to +70°C
–40°C to +85°C
0°C to +70°C
–40°C to +85°C
–40°C to +85°C
0°C to +70°C
0°C to +70°C
–40°C to +85°C
0°C to +70°C
Inverting
Inverting
–40°C to +85°C
–40°C to +85°C
0°C to +70°C
Inverting
Inverting
Inverting
Pin Configurations
VS
IN
VS
1
2
3
4
8
7
6
5
OUT
OUT
GND
NC
GND
5
Plastic DIP (N)
SOIC (M)
MSOP (MM)
5
4
3
2
1
OUT
GND
VS
GND
IN
TO-220-5 (T)
Pin Description
Pin Number
TO-220-5
Pin Number
DIP, SOIC, MSOP
Pin Name
Pin Function
1
2, 4
3, TAB
5
2
IN
GND
VS
Control Input
4, 5
1, 8
6, 7
3
Ground: Duplicate pins must be externally connected together.
Supply Input: Duplicate pins must be externally connected together.
Output: Duplicate pins must be externally connected together.
Not connected.
OUT
NC
April 1998
5-33
MIC4420/4429
Micrel
Absolute Maximum Ratings (Notes 1, 2 and 3) Operating Ratings
Supply Voltage .......................................................... 20V
Junction Temperature ............................................ 150°C
Ambient Temperature
Input Voltage ...............................V + 0.3V to GND – 5V
S
Input Current (V > V ) ......................................... 50mA
C Version ................................................0°C to +70°C
B Version.............................................–40°C to +85°C
Package Thermal Resistance
IN
S
Power Dissipation, T ≤ 25°C
A
PDIP ................................................................... 960W
SOIC ............................................................. 1040mW
5-Pin TO-220.......................................................... 2W
5-pin TO-220 (θ ) .......................................... 10°C/W
JC
8-pin MSOP (θ ) .......................................... 250°C/W
JA
Power Dissipation, T ≤ 25°C
C
5-Pin TO-220..................................................... 12.5W
Derating Factors (to Ambient)
PDIP ............................................................ 7.7mW/°C
SOIC ........................................................... 8.3mW/°C
5-Pin TO-220................................................ 17mW/°C
Storage Temperature ............................–65°C to +150°C
Lead Temperature (10 sec.) .................................. 300°C
Electrical Characteristics: (T = 25°C with 4.5V ≤ V ≤ 18V unless otherwise specified.)
A
S
Symbol
Parameter
Conditions
Min
Typ
Max
Units
INPUT
V
Logic 1 Input Voltage
Logic 0 Input Voltage
Input Voltage Range
Input Current
2.4
1.4
1.1
V
V
IH
V
0.8
IL
V
–5
V + 0.3
S
V
IN
I
0 V ≤ V ≤ V
–10
10
µA
IN
IN
S
OUTPUT
V
High Output Voltage
Low Output Voltage
See Figure 1
See Figure 1
V –0.025
S
V
V
Ω
OH
V
0.025
2.8
OL
R
O
Output Resistance,
Output Low
I
= 10 mA, V = 18 V
S
1.7
1.5
6
OUT
R
O
Output Resistance,
Output High
I
= 10 mA, V = 18 V
S
2.5
Ω
OUT
I
Peak Output Current
V
= 18 V (See Figure 5)
A
PK
S
I
Latch-Up Protection
Withstand Reverse Current
>500
mA
R
SWITCHING TIME (Note 3)
t
t
t
t
Rise Time
Fall Time
Test Figure 1, C = 2500 pF
L
12
13
18
48
35
35
75
75
ns
ns
ns
ns
R
Test Figure 1, C = 2500 pF
L
F
Delay Time
Delay Time
Test Figure 1
Test Figure 1
D1
D2
POWER SUPPLY
Power Supply Current
I
V
V
= 3 V
= 0 V
0.45
90
1.5
150
mA
µA
S
IN
IN
V
Operating Input Voltage
4.5
18
V
S
5-34
April 1998
MIC4420/4429
Micrel
Electrical Characteristics: (T = –55°C to +125°C with 4.5V ≤ V ≤ 18V unless otherwise specified.)
A
S
Symbol
Parameter
Conditions
Min
Typ
Max
Units
INPUT
V
Logic 1 Input Voltage
Logic 0 Input Voltage
Input Voltage Range
Input Current
2.4
V
V
IH
V
0.8
IL
V
–5
V + 0.3
S
V
IN
I
0V ≤ V ≤ V
–10
10
µA
IN
IN
S
OUTPUT
V
High Output Voltage
Low Output Voltage
Figure 1
Figure 1
V –0.025
S
V
V
Ω
OH
V
0.025
5
OL
R
O
Output Resistance,
Output Low
I
= 10mA, V = 18V
S
3
OUT
R
O
Output Resistance,
Output High
I
= 10mA, V = 18V
S
2.3
5
Ω
OUT
SWITCHING TIME (Note 3)
t
t
t
t
Rise Time
Fall Time
Figure 1, C = 2500pF
L
32
34
50
65
60
60
ns
ns
ns
ns
R
Figure 1, C = 2500pF
L
F
Delay Time
Delay Time
Figure 1
Figure 1
100
100
D1
D2
POWER SUPPLY
Power Supply Current
I
V
V
= 3V
= 0V
0.45
0.06
3.0
0.4
mA
mA
S
IN
IN
5
V
Operating Input Voltage
4.5
18
V
S
NOTE 1:
NOTE 2:
Functional operation above the absolute maximum stress ratings is not implied.
Static-sensitive device. Store only in conductive containers. Handling personnel and equipment should be grounded to
prevent damage from static discharge.
NOTE 3:
Switching times guaranteed by design.
Test Circuits
VS = 18V
VS = 18V
0.1µF
1.0µF
0.1µF
0.1µF
1.0µF
0.1µF
IN
OUT
2500pF
IN
OUT
2500pF
MIC4429
MIC4420
5V
90%
5V
90%
2.5V
2.5V
INPUT
INPUT
t
PW ≥ 0.5µs
t
PW ≥ 0.5µs
10%
0V
10%
0V
tPW
tPW
tD1
tF
tR
tD2
tD1
tF
tD2
tR
VS
90%
VS
90%
OUTPUT
OUTPUT
10%
0V
10%
0V
Figure 1a. Inverting Driver Switching Time
Figure 1b. Noninverting Driver Switching Time
April 1998
5-35
MIC4420/4429
Micrel
Typical Characteristic Curves
Rise Time vs. Supply Voltage
Fall Time vs. Supply Voltage
Rise and Fall Times vs. Temperature
60
50
40
30
20
10
0
25
20
15
10
5
C
V
= 2200 pF
= 18V
L
S
50
C
= 10,000 pF
L
C
= 10,000 pF
L
40
30
20
10
0
t
FALL
t
RISE
C
C
= 4700 pF
L
C
C
= 4700 pF
L
= 2200 pF
L
= 2200 pF
L
0
–60
5
7
9
11
(V)
13
15
5
7
9
11
(V)
13
15
–20
20
60
100
140
V
TEMPERATURE (°C)
V
S
S
Delay Time vs. Supply Voltage
Rise Time vs. Capacitive Load
Fall Time vs. Capacitive Load
50
60
50
40
30
20
10
0
50
40
40
30
30
20
t
D2
V
= 5V
S
20
V
= 5V
S
V
= 12V
V
= 12V
S
S
V
= 18V
S
V
= 18V
S
10
5
10
5
t
D1
1000
3000
CAPACITIVE LOAD (pF)
10,000
1000
10,000
4
6
8
10
12 14 16 18
3000
CAPACITIVE LOAD (pF)
SUPPLY VOLTAGE (V)
Propagation Delay Time
vs. Temperature
Supply Current vs. Capacitive Load
Supply Current vs. Frequency
60
84
1000
100
V
= 15V
C = 2200 pF
L
S
18V
70
56
42
28
14
0
t
D2
50
40
30
20
10
10V
5V
500 kHz
200 kHz
20 kHz
1000
10,000
t
D1
10
0
C
V
= 2200 pF
= 18V
L
S
0
100
0
100
1000
10,000
–60
–20
20
60
100
140
CAPACITIVE LOAD (pF)
FREQUENCY (kHz)
TEMPERATURE (°C)
5-36
April 1998
MIC4420/4429
Micrel
Typical Characteristic Curves (Cont.)
Quiescent Power Supply
Voltage vs. Supply Current
1000
Quiescent Power Supply
Current vs. Temperature
900
800
700
600
500
400
LOGIC “1” INPUT
V
= 18V
S
800
600
LOGIC “1” INPUT
400
200
LOGIC “0” INPUT
0
0
4
8
12
16
20
–60
–20
20
60
100
140
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
Low-State Output Resistance
High-State Output Resistance
2.5
2
5
4
3
2
100 mA
5
100 mA
50 mA
50 mA
10 mA
1.5
1
10 mA
5
7
9
11
(V)
13
15
5
7
9
11
(V)
13
15
V
V
S
S
Effect of Input Amplitude
on Propagation Delay
Crossover Area vs. Supply Voltage
200
160
120
80
2.0
LOAD = 2200 pF
PER TRANSITION
1.5
INPUT 2.4V
1.0
0.5
0
INPUT 3.0V
INPUT 5.0V
40
INPUT 8V AND 10V
0
5
6
7
8
9
10 11 12 13 14 15
5
6
7
8
9
10 11 12 13 14 15
V
(V)
SUPPLY VOLTAGE V (V)
S
s
April 1998
5-37
MIC4420/4429
Micrel
Applications Information
Grounding
The high current capability of the MIC4420/4429 demands
careful PC board layout for best performance Since the
MIC4429 is an inverting driver, any ground lead impedance
willappearasnegativefeedbackwhichcandegradeswitch-
ing speed. Feedback is especially noticeable with slow-rise
time inputs. The MIC4429 input structure includes 300mV
of hysteresis to ensure clean transitions and freedom from
oscillation, but attention to layout is still recommended.
Supply Bypassing
Charging and discharging large capacitive loads quickly
requires large currents. For example, charging a 2500pF
load to 18V in 25ns requires a 1.8 A current from the device
power supply.
The MIC4420/4429 has double bonding on the supply pins,
the ground pins and output pins This reduces parasitic lead
inductance. Low inductance enables large currents to be
switched rapidly. It also reduces internal ringing that can
cause voltage breakdown when the driver is operated at or
near the maximum rated voltage.
Figure3showsthefeedbackeffectindetail.AstheMIC4429
input begins to go positive, the output goes negative and
several amperes of current flow in the ground lead. As little
as 0.05Ω of PC trace resistance can produce hundreds of
millivolts at the MIC4429 ground pins. If the driving logic is
referenced to power ground, the effective logic input level is
reduced and oscillation may result.
Internal ringing can also cause output oscillation due to
feedback. This feedback is added to the input signal since
it is referenced to the same ground.
To insure optimum performance, separate ground traces
should be provided for the logic and power connections.
Connecting the logic ground directly to the MIC4429 GND
pins will ensure full logic drive to the input and ensure fast
output switching. Both of the MIC4429 GND pins should,
however, still be connected to power ground.
To guarantee low supply impedance over a wide frequency
range,aparallelcapacitorcombinationisrecommendedfor
supply bypassing. Low inductance ceramic disk capacitors
with short lead lengths (< 0.5 inch) should be used. A 1µF
low ESR film capacitor in parallel with two 0.1 µF low ESR
ceramic capacitors, (such as AVX RAM GUARD®), pro-
vides adequate bypassing. Connect one ceramic capacitor
directly between pins 1 and 4. Connect the second ceramic
capacitor directly between pins 8 and 5.
+15
(x2) 1N4448
5.6 kΩ
OUTPUT VOLTAGE vs LOAD CURRENT
30
560 Ω
0.1µF
50V
29
+
1µF
50V
28
BYV 10 (x 2)
1
MKS 2
30 Ω LINE
8
27
+
6, 7
2
MIC4429
26
25
0.1µF
WIMA
MKS 2
220 µF 50V
+
5
35 µF 50V
4
0
20 40 60 80 100 120 140
mA
UNITED CHEMCON SXE
Figure 3. Self-Contained Voltage Doubler
5-38
April 1998
MIC4420/4429
Micrel
current to destroy the device. The MIC4420/4429 on the
other hand, can source or sink several amperes and drive
large capacitive loads at high frequency. The package
power dissipation limit can easily be exceeded. Therefore,
some attention should be given to power dissipation when
driving low impedance loads and/or operating at high fre-
quency.
Input Stage
The input voltage level of the 4429 changes the quiescent
supply current. The N channel MOSFET input stage tran-
sistor drives a 450µA current source load. With a logic “1”
input, the maximum quiescent supply current is 450µA.
Logic “0” input level signals reduce quiescent current to
55µA maximum.
The supply current vs frequency and supply current vs
capacitive load characteristic curves aid in determining
power dissipation calculations. Table 1 lists the maximum
safe operating frequency for several power supply voltages
when driving a 2500pF load. More accurate power dissipa-
tion figures can be obtained by summing the three dissipa-
tion sources.
The MIC4420/4429 input is designed to provide 300mV of
hysteresis. This provides clean transitions, reduces noise
sensitivity, and minimizes output stage current spiking
when changing states. Input voltage threshold level is
approximately 1.5V, making the device TTL compatible
over the 4 .5V to 18V operating supply voltage range. Input
current is less than 10µA over this range.
Given the power dissipation in the device, and the thermal
resistance of the package, junction operating temperature
for any ambient is easy to calculate. For example, the
thermal resistance of the 8-pin MSOP package, from the
data sheet, is 250°C/W. In a 25°C ambient, then, using a
maximum junction temperature of 150°C, this package will
dissipate 500mW.
TheMIC4429canbedirectlydrivenbytheTL494, SG1526/
1527, SG1524, TSC170, MIC38HC42 and similar switch
mode power supply integrated circuits. By offloading the
power-driving duties to the MIC4420/4429, the power sup-
ply controller can operate at lower dissipation. This can
improve performance and reliability.
+
The input can be greater than the V supply, however,
S
Accurate power dissipation numbers can be obtained by
summing the three sources of power dissipation in the
device:
current will flow into the input lead. The propagation delay
for T will increase to as much as 400ns at room tempera-
D2
ture. The input currents can be as high as 30mA p-p
• Load Power Dissipation (P )
L
(6.4mA
) with the input, 6 V greater than the supply
RMS
• Quiescent power dissipation (P )
Q
voltage. No damage will occur to MIC4420/4429 however,
and it will not latch.
5
• Transition power dissipation (P )
T
Calculation of load power dissipation differs depending on
whether the load is capacitive, resistive or inductive.
The input appears as a 7pF capacitance, and does not
change even if the input is driven from an AC source. Care
should be taken so that the input does not go more than 5
volts below the negative rail.
Resistive Load Power Dissipation
Dissipation caused by a resistive load can be calculated as:
2
Power Dissipation
P = I R D
L
O
CMOS circuits usually permit the user to ignore power
dissipation. Logic families such as 4000 and 74C have
outputswhichcanonlysupplyafewmilliamperesofcurrent,
and even shorting outputs to ground will not force enough
where:
I = the current drawn by the load
R
O
= the output resistance of the driver when the output is
high, at the power supply voltage used. (See data
sheet)
D = fraction of time the load is conducting (duty cycle)
+18 V
Table 1: MIC4429 Maximum
Operating Frequency
WIMA
MK22
1 µF
5.0V
18 V
1
TEK CURRENT
PROBE 6302
V
Max Frequency
500kHz
S
8
2
6, 7
18V
15V
10V
MIC4429
0 V
5
0 V
700kHz
0.1µF
0.1µF
4
10,000 pF
POLYCARBONATE
1.6MHz
Conditions: 1. DIP Package (θ = 130°C/W)
JA
2. T = 25°C
A
3. C = 2500pF
L
Figure 3. Switching Time Degradation Due to
Negative Feedback
April 1998
5-39
MIC4420/4429
Micrel
Capacitive Load Power Dissipation
where:
I = quiescent current with input high
Dissipationcausedbyacapacitiveloadissimplytheenergy
placed in, or removed from, the load capacitance by the
driver. The energy stored in a capacitor is described by the
equation:
H
I = quiescent current with input low
L
D = fraction of time input is high (duty cycle)
V = power supply voltage
S
2
E = 1/2 C V
Transition Power Dissipation
As this energy is lost in the driver each time the load is
charged or discharged, for power dissipation calculations
the 1/2 is removed. This equation also shows that it is good
practice not to place more voltage on the capacitor than is
necessary, as dissipation increases as the square of the
voltage applied to the capacitor. For a driver with a capaci-
tive load:
Transition power is dissipated in the driver each time its
output changes state, because during the transition, for a
very brief interval, both the N- and P-channel MOSFETs in
theoutputtotem-poleareONsimultaneously, andacurrent
+
is conducted through them from V to ground. The transi-
S
tion power dissipation is approximately:
P = 2 f V (A•s)
T
S
2
P = f C (V )
L
S
where (A•s) is a time-current factor derived from the typical
characteristic curves.
where:
f = Operating Frequency
C = Load Capacitance
V = Driver Supply Voltage
S
Total power (P ) then, as previously described is:
D
P = P + P +P
D
L
Q
T
Definitions
Inductive Load Power Dissipation
C = Load Capacitance in Farads.
L
For inductive loads the situation is more complicated. For
the part of the cycle in which the driver is actively forcing
current into the inductor, the situation is the same as it is in
the resistive case:
D = Duty Cycle expressed as the fraction of time the
input to the driver is high.
f = Operating Frequency of the driver in Hertz
2
P
L1
= I R D
O
I = Power supply current drawn by a driver when
H
However, in this instance the R required may be either the
O
both inputs are high and neither output is loaded.
on resistance of the driver when its output is in the high
state, or its on resistance when the driver is in the low state,
depending on how the inductor is connected, and this is still
only half the story. For the part of the cycle when the
inductor is forcing current through the driver, dissipation is
best described as
I = Power supply current drawn by a driver when
L
both inputs are low and neither output is loaded.
I = Output current from a driver in Amps.
D
P = Total power dissipated in a driver in Watts.
D
P
L2
= I V (1-D)
P = Power dissipated in the driver due to the driver’s
L
D
load in Watts.
whereV istheforwarddropoftheclampdiodeinthedriver
D
(generally around 0.7V). The two parts of the load dissipa-
P = Power dissipated in a quiescent driver in Watts.
Q
tion must be summed in to produce P
L
P = Power dissipated in a driver when the output
T
P = P + P
L2
changesstates(“shoot-throughcurrent”)inWatts.
NOTE: The “shoot-through” current from a dual
transition (once up, once down) for both drivers
is shown by the "Typical Characteristic Curve :
Crossover Area vs. Supply Voltage and is in
ampere-seconds. This figure must be multiplied
by the number of repetitions per second (fre-
quency) to find Watts.
L
L1
Quiescent Power Dissipation
Quiescent power dissipation (P , as described in the input
Q
section) depends on whether the input is high or low. A low
input will result in a maximum current drain (per driver) of
≤0.2mA; a logic high will result in a current drain of ≤2.0mA.
Quiescent power can therefore be found from:
R = Output resistance of a driver in Ohms.
O
P
Q
= V [D I + (1-D) I ]
S H L
V = Power supply voltage to the IC in Volts.
S
5-40
April 1998
MIC4420/4429
Micrel
+18 V
WIMA
MK22
1 µF
5.0V
18 V
1
TEK CURRENT
PROBE 6302
8
2
6, 7
MIC4429
0 V
5
0 V
0.1µF
0.1µF
4
10,000 pF
POLYCARBONATE
5
Figure 6. Peak Output Current Test Circuit
April 1998
5-41
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SI9130LG-T1-E3
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SI9130_11
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SI9137
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SI9137DB
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SI9122E
500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification DriversWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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