MIC4478/4479/4480
32V Low-Side Dual MOSFET Drivers
General Description
The MIC4478, MIC4479, and MIC4480 are low-side dual
MOSFET drivers are designed to switch N-channel
enhancement type MOSFETs from TTL-compatible control
signals for low-side switch applications. The MIC4478 is
dual non-inverting, the MIC4479 is dual inverting, and the
MIC4480 is complimentary non-inverting and inverting.
These drivers feature short delays and high peak currents
to produce precise edges and rapid rise and fall times.
The MIC4478/4479/4480 are powered from a +4.5V to
+32V supply voltage. The on-state gate drive output
voltage is approximately equal to the supply voltage (no
internal regulators or clamps).
In a low-side configuration, the drivers can control a
MOSFET that switches any voltage up to the rating of the
MOSFET. The MIC4478/4479/4480 are available in the 8-
lead SOIC (ePAD and non-ePAD) package and are rated
for the –40°C to +125°C ambient temperature range.
Datasheets and support documentation are available on
Micrel’s web site at:
www.micrel.com.
Features
•
+4.5V to +32V operation
•
300µA typical supply quiescent current
•
2.5A nominal peak output per channel
−
6Ω high-side typical output resistance
−
3Ω low-side typical output resistance
•
Active-high driver enable inputs with internal pull-ups
•
Operates with low-side switch circuits
•
–40°C to +125°C ambient temperature range
•
ESD protection
•
Dual inverting, dual non-inverting, and inverting + non-
inverting versions
•
8-pin SOIC (ePAD and non-ePAD)
Applications
•
Synchronous switch-mode power supplies
•
Secondary side synchronous rectification
Typical Application
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 •
http://www.micrel.com
December 9, 2014
Revision 1.0
Micrel, Inc.
MIC4478/4479/4480
Ordering Information
Part Number
MIC4478YM
MIC4478YME
MIC4479YM
MIC4479YME
MIC4480YM
MIC4480YME
Marking
4478YM
4478YME
4479YM
4479YME
4480YM
4480YME
Configuration
Dual Non-Inverting
Dual Non-Inverting
Dual Inverting
Dual Inverting
Inverting + Non-Inverting
Inverting + Non-Inverting
Junction Temp. Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
8-pin SOIC
8-pin ePAD SOIC
8-pin SOIC
8-pin ePAD SOIC
8-pin SOIC
8-pin ePAD SOIC
Lead Finish
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pin Configurations
December 9, 2014
2
Revision 1.0
Micrel, Inc.
MIC4478/4479/4480
Pin Description
Pin Number
MIC4478
Pin Number
MIC4479
Pin Number
MIC4480
Pin Name
Pin Description
Enable pin channel A. TTL-compatible enabling/disabling of the
device. An internal pull-up enables the device if this pin is
floating or unconnected. A logic-low voltage disables the device
and the output (OUTA) will be pulled to ground regardless of the
input state.
Input channel A. TTL-compatible on/off control input.
MIC4478 only: A logic-high forces the output (OUTA) to the
supply voltage. A logic-low forces OUTA to ground.
MIC4479 only: A logic-low forces the output (/OUTA) to the
supply voltage. A logic-high forces /OUTA to ground.
MIC4480 only: Complimentary logic-low/high (INA/INB) forces
the output (/OUTA) to the supply voltage. Complimentary logic-
high/high (INA/INB) forces /OUTA to ground.
Ground. Power return.
Input channel B. TTL-compatible on/off control input.
MIC4478 only: A logic-high forces the output (OUTB) to the
supply voltage. A logic-low forces OUTB to ground.
MIC4479 only: A logic-low forces the output (/OUTB) to the
supply voltage. A logic-high forces /OUTB to ground.
MIC4480 only: Complimentary logic-low/high (INA/INB) forces
the output (OUTB) to the supply voltage. Complimentary logic-
high/high (INA/INB) forces OUTB to ground.
Channel B Output (Non-Inverting). Gate drive connection to the
external MOSFET.
Channel B Output (Inverting). Gate drive connection to the
external MOSFET.
Supply Input. +4.5V to +32V supply.
Channel A Output (Non-Inverting). Gate drive connection to the
external MOSFET.
Channel A Output (Inverting). Gate drive connection to the
external MOSFET.
Enable pin channel B. TTL-compatible enabling/disabling of the
device. An internal pull-up enables the device if this pin is
floating or unconnected. A logic-low voltage disables the device
and the output (OUTB) will be pulled to ground regardless of the
input state.
Ground. Exposed pad of the YME package option. Connect this
pad to GND for best thermal performance.
1
1
1
ENA
2
2
2
INA
3
3
3
GND
4
4
4
INB
5
-
6
7
-
-
5
6
-
7
5
-
6
-
7
OUTB
/OUTB
VS
OUTA
/OUTA
8
8
8
ENB
EP
EP
EP
ePAD
December 9, 2014
3
Revision 1.0
Micrel, Inc.
MIC4478/4479/4480
Absolute Maximum Ratings
(1)
Supply Voltage (V
S
) ....................................... –0.3V to +36V
Input Voltage (V
INA,
V
INB
) ............................... –0.3V to +36V
Enable Voltage (V
ENA,
V
ENB
) .......................... –0.3V to +36V
Output Voltage (V
OUTA,
V
OUTB
) ....................... –0.3V to +36V
Junction Temperature (T
J
) ......................................... 150°C
Lead Temperature (soldering, 10s) ............................ 260°C
Ambient Storage Temperature (T
S
)........... –65°C to +150°C
ESD Rating(
3
)
Machine Model ...................................................... 200V
Human Body Model ................................................. 2kV
Operating Ratings
(2)
Supply Voltage (V
S
)....................................... +4.5V to +32V
Input Voltage (V
INA,
V
INB
) ......................................... 0V to V
S
Enable Voltage (V
ENA,
V
ENB
) .................................... 0V to V
S
Ambient Temperature (T
A
) ........................ –40°C to +125°C
Junction Thermal Resistance
8 pin-SOIC (θ
JA
) ................................................. 63°C/W
8 pin-ePAD SOIC (θ
JA
) ...................................... 40°C/W
Electrical Characteristics
(4)
V
S
=12V; T
A
= 25°C,
bold
values indicate -40°C ≤ T
J
≤ +125°C, unless noted.
Symbol
Supply
V
S
Supply Voltage Range
V
ENA,
V
ENB
= open; V
INA,
V
INB
= 5V/5V (MIC4478)
V
ENA,
V
ENB
= open; V
INA,
V
INB
= 0V/0V (MIC4478)
V
ENA,
V
ENB
= 0V; V
INA,
V
INB
= 5V/5V (MIC4478)
V
ENA,
V
ENB
= 0V; V
INA,
V
INB
= 0V/0V (MIC4478)
V
ENA,
V
ENB
= open; V
INA,
V
INB
= 0V/0V (MIC4479)
I
S
Quiescent Current
V
ENA,
V
ENB
= open; V
INA,
V
INB
= 5V/5V (MIC4479)
V
ENA,
V
ENB
= 0V; V
INA,
V
INB
= 0V/0V (MIC4479)
V
ENA,
V
ENB
= 0V; V
INA,
V
INB
= 5V/5V (MIC4479)
V
ENA,
V
ENB
= open; V
INA,
V
INB
= 0V/5V (MIC4480)
V
ENA,
V
ENB
= open; V
INA,INB
= 5V/0V (MIC4480)
V
ENA,
V
ENB
= 0V; V
INA,INB
= 0V/5V (MIC4480)
V
ENA,
V
ENB
=0V; V
INA,INB
= 5V/0V (MIC4480)
Input
V
INA,
V
INB
→ logic 1 input
V
INA,INB
Input Voltage
V
INA,
V
INB
→ logic 0 input
Hysteresis voltage
I
INA,INB
t
RD,INA,INB
Input Current
Rising delay time:
V
INA,INB
to V
OUTA,
V
OUTB
Falling delay time:
V
INA,
V
INB
to V
OUTA,
V
OUTB
0V ≤ V
INA,INB
≤ V
S
V
S
= 12V; C
L
= 1000Pf
V
S
= 30V; C
L
= 1000pF
V
S
= 12V; C
L
= 1000pF
V
S
= 30V; C
L
= 1000pF
–10
0.3
10
160
160
70
70
2.4
0.8
V
V
V
µA
ns
ns
ns
ns
300
600
µA
300
600
µA
300
600
µA
4.5
32
V
Parameter
Condition
Min.
Typ.
Max.
Units
t
FD,INA,INB
Notes:
1. Exceeding the absolute maximum ratings may damage the device.
2. The device is not guaranteed to function outside its operating ratings.
3. Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5kΩ in series with 100pF.
4. Specification for packaged product only.
December 9, 2014
4
Revision 1.0
Micrel, Inc.
MIC4478/4479/4480
Electrical Characteristics
(4)
(Continued)
V
S
= 12V; T
J
= 25°C,
bold
values indicate -40°C ≤ T
J
≤ +125°C, unless noted.
Symbol
Enable
V
EN
logic 1 input
V
ENA,
V
ENB
Enable Voltage
V
EN
logic 0 input
Hysteresis voltage
I
ENA,
I
ENB
Output
t
R
Rise Time:
Output V
OUTA
, V
OUTB
Fall Time:
Output V
OUTA,
V
OUTB
Output Resistance
Output Reverse Current
V
S
= 12V; C
L
= 1000pF
V
S
= 30V; C
L
= 1000pF
V
S
= 12V; C
L
= 1000pF
V
S
= 30V; C
L
= 1000pF
PMOS: V
S
= 12V, I
OUT
= 100mA
NMOS: V
S
= 12V, I
OUT
= 100mA
No latch up
6
3
250
120
120
45
45
ns
ns
ns
ns
Ω
Ω
mA
Enable Current
0V ≤ V
ENA,
V
ENB
≤ V
S
-10
0.3
10
2.4
0.8
V
V
V
µA
Parameter
Condition
Min.
Typ.
Max.
Units
t
F
Z
OUTA
, Z
OUTB
I
OUT REVERSE
December 9, 2014
5
Revision 1.0
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