MIC5020YM Micrel Inc, MIC5020YM Datasheet - Page 7

• Manufacturer Part Number: MIC5020YM
• Description: IC DRIVER MOSF LO SIDE HS 8-SOIC
• Manufacturer: Micrel Inc

Specifications of MIC5020YM

• Configuration: Low-Side
• Input Type: Non-Inverting
• Delay Time: 400ns
• Number Of Configurations: 1
• Number Of Outputs: 1
• Voltage - Supply: 11 V ~ 50 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Device Type: Low Side
• Module Configuration: Low Side
• Input Delay: 400ns
• Output Delay: 900ns
• Supply Voltage Range: 11V To 50V
• Driver Case Style: SOIC
• No. Of Pins: 8
• Number Of Drivers: 1
• Driver Configuration: Non-Inverting
• Driver Type: Low Side
• Input Logic Level: TTL
• Rise Time: 1500ns
• Fall Time: 1500ns
• Frequency (max): 150MHz
• Operating Supply Voltage (max): 50V
• Operating Supply Voltage (min): 11V
• Turn Off Delay Time: 1.5ps
• Turn On Delay Time (max): 800ps
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 8
• Package Type: SOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Peak: -
• High Side Voltage - Max (bootstrap): -
• Lead Free Status / RoHS Status: Compliant, Lead free / RoHS Compliant
• Other names: 576-1818-5; MIC5020YM

Maintained (L)
Faster MOSFET Switching
The MIC5020’s
bipolar transistors to permit faster charging and discharging
of the external MOSFET’s gate.
NPN and PNP transistors are used to respectively charge
and discharge the MOSFET gate. The MIC5020 gate current
is multiplied by the transistor β.
The switched circuit voltage can be increased above 40V by
selecting transistors with higher ratings.
Remote Overcurrent Limiting Reset
In circuit breaker applications where the MIC5020 maintains
an off condition after an overcurrent condition is sensed, the
C
Switching Q1 on pulls C
output off when an overcurrent is sensed. Switching Q1 off
causes C
20µs and continues to retry until the overcurrent condition
is removed.
July 2005
MIC5020
+11V to +50V
150kHz max.
T
Retry (H)
+11V to +50V
pin can be used to reset the MIC5020.
TTL input
Figure 4. Faster MOSFET Switching Circuit
(example)
74HC04
10µF
T
to appear open. The MIC5020 retries in about
Figure 5. Remote Control Circuit
10µF
10k to
100k
GATE
1
2
3
4
Q1
2N3904
V
Input
Fault
C
current can be multiplied using a pair of
DD
T
T
MIC5020
1
2
3
4
low which keeps the MIC5020
V
Input
Fault
C
Sense-
Sense+
DD
T
MIC5020
Gate
Gnd
Sense-
Sense+
2N3904
8
7
6
5
Gate
Gnd
2N3906
8
7
6
5
+40V max.
V+
N-Channel
Power MOSFET
R
N-Channel
Power MOSFET
(IRF540)
S E N S E
GATE
7
For test purposes, a 680Ω load resistor and 3Ω sense resistor
will produce an overcurrent condition when the load’s supply
(V+) is approximately 12V or greater.
Low-Temperature Operation
As the temperature of the MIC5020AJB (extended tempera-
ture range version—no longer available) approaches –55°C,
the driver’s off-state, gate-output offset from ground increases.
If the operating environment of the MIC5020AJB includes low
temperatures (–40°C to –55°C), add an external 2.2MΩ resis-
tor as shown in Figures 6a or 6b. This assures that the driver’s
gate-to-source voltage is far below the external MOSFET’s
gate threshold voltage, forcing the MOSFET fully off.
The gate-to-source configuration (refer to Figure 6a) is ap-
propriate for resistive and inductive loads. This also causes
the smallest decrease in gate output voltage.
The gate-to-ground configuration (refer to Figure 6b) is ap-
propriate for resistive, inductive, or capacitive loads. This
configuration will decrease the gate output voltage slightly
more than the circuit shown in Figure 6a.
+11V to +50V
+11V to +50V
10µF
Figure 6b. Gate-to-Ground Pull Down
Figure 6a. Gate-to-Source Pull Down
10µF
1
2
3
4
V
Input
Fault
C
1
2
3
4
DD
T
MIC5020
V
Input
Fault
C
DD
T
MIC5020
Sense-
Sense+
Gate
Sense-
Sense+
Gnd
Gate
Gnd
8
7
6
5
8
7
6
5
2.2M
R
S E N S E
2.2M
V+
R
V+
S E N S E
Micrel, Inc.
MIC5020