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PDF MIC5014-1 Data sheet ( Hoja de datos )
| Número de pieza | MIC5014-1 | |
| Descripción | Low-Cost High- or Low-Side MOSFET Driver Final Information | |
| Fabricantes | Micrel Semiconductor | |
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MIC5014/5015
MIC5014/5015
Micrel
Low-Cost High- or Low-Side MOSFET Driver
Final Information
General Description
MIC5014 and MIC5015 MOSFET drivers are designed for
gate control of N-channel, enhancement-mode, power
MOSFETs used as high-side or low-side switches. The
MIC5014/5 can sustain an on-state output indefinitely.
The MIC5014/5 operates from a 2.75V to 30V supply. In high-
side configurations, the driver can control MOSFETs that
switch loads of up to 30V. In low-side configurations, with
separate supplies, the maximum switched voltage is limited
only by the MOSFET.
The MIC5014/5 has a TTL compatible control input. The
MIC5014 is noninverting while the MIC5015 is inverting.
The MIC5014/5 features an internal charge pump that can
sustain a gate voltage greater than the available supply
voltage. The driver is capable of turning on a logic-level
MOSFET from a 2.75V supply or a standard MOSFET from a
5V supply. The gate-to-source output voltage is internally
limited to approximately 15V.
The MIC5014/5 is protected against automotive load dump,
reversed battery, and inductive load spikes of –20V. The
driver’s overvoltage shutdown feature turns off the external
MOSFET at approximately 35V to protect the load against
power supply excursions.
The MIC5014 is an improved pin-for-pin compatible replace-
ment in many MIC5011 applications.
The MIC5014/5 is available in plastic 8-pin DIP and 8-pin
SOIC pacakges.
Typical Application
+3V to +4V
10µF
Control Input
ON
OFF
MIC5014
1 V+
NC 8
2 Input
NC 7
3 Source NC 6
4 Gnd
Gate 5
IRLZ24
Features
• 2.75V to 30V operation
• 100µA maximum supply current (5V supply)
• 15µA typical off-state current
• Internal charge pump
• TTL compatible input
• Withstands 60V transient (load dump)
• Reverse battery protected to –20V
• Inductive spike protected to –20V
• Overvoltage shutdown at 35V
• Internal 15V gate protection
• Minimum external parts
• Operates in high-side or low-side configurations
• 1µA control input pull-off
• Inverting and noninverting versions
Applications
• Automotive electrical load control
• Battery-powered computer power management
• Lamp control
• Heater control
• Motor control
• Power bus switching
Ordering Information
Part Number
Noninverting
MIC5014BM
MIC5014BN
Inverting
MIC5015BM
MIC5015BN
Temperature Range
Package
–40°C to +85°C
–40°C to +85°C
8-pin SOIC
8-pin Plastic DIP
–40°C to +85°C
–40°C to +85°C
8-pin SOIC
8-pin Plastic DIP
Figure 1. 3V “Sleep-Mode” Switch
with a Logic-Level MOSFET
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
1997
1 MIC5014/5015
1 page  
MIC5014/5015
Applications Information
Functional Description
The MIC5014 is functionally and pin for pin compatible with
the MIC5011, except for the omission of the optional speed-
up capacitor pins, which are available on the MIC5011. The
MIC5015 is an inverting configuration of the MIC5014.
The internal functions of these devices are controlled via a
logic block (refer to block diagram) connected to the control
input (pin 2). When the input is off (low for the MIC5014, and
high for the MIC5015), all functions are turned off, and the
gate of the external power MOSFET is held low via two N-
channel switches. This results in a very low standby current;
15µA typical, which is necessary to power an internal bandgap.
When the input is driven to the “ON” state, the N-channel
switches are turned off, the charge pump is turned on, and the
P-channel switch between the charge pump and the gate
turns on, allowing the gate of the power FET to be charged.
The op amp and internal zener form an active regulator which
shuts off the charge pump when the gate voltage is high
enough. This is a feature not found on the MIC5011.
The charge pump incorporates a 100kHz oscillator and on-
chip pump capacitors capable of charging a 1,000pF load in
90µs typical. In addition to providing active regulation, the
internal 15V zener is included to prevent exceeding the VGS
rating of the power MOSFET at high supply voltages.
The MIC5014/15 devices have been improved for greater
ruggedness and durability. All pins can withstand being
pulled 20V below ground without sustaining damage, and the
supply pin can withstand an overvoltage transient of 60V for
1s. An overvoltage shutdown has also been included, which
turns off the device when the supply exceeds 35V.
Construction Hints
High current pulse circuits demand equipment and assembly
techniques that are more stringent than normal, low current
lab practices. The following are the sources of pitfalls most
often encountered during prototyping: Supplies : Many bench
power supplies have poor transient response. Circuits that
are being pulse tested, or those that operate by pulse-width
modulation will produce strange results when used with a
supply that has poor ripple rejection, or a peaked transient
response. Always monitor the power supply voltage that
appears at the drain of a high side driver (or the supply side
of the load for a low side driver) with an oscilloscope. It is not
uncommon to find bench power supplies in the 1kW class that
overshoot or undershoot by as much as 50% when pulse
loaded. Not only will the load current and voltage measure-
ments be affected, but it is possible to overstress various
components, especially electrolytic capacitors, with possibly
catastrophic results. A 10µF supply bypass capacitor at the
chip is recommended. Residual resistances: Resistances
in circuit connections may also cause confusing results. For
example, a circuit may employ a 50mΩ power MOSFET for
low voltage drop, but unless careful construction techniques
are used, one could easily add 50 to 100mΩ resistance. Do
Micrel
not use a socket for the MOSFET. If the MOSFET is a TO-220
type package, make high current connections to the drain tab.
Wiring losses have a profound effect on high-current circuits.
A floating milliohmeter can identify connections that are con-
tributing excess drop under load.
Low Voltage Testing
As the MIC5014/MIC5015 have relatively high output imped-
ances, a normal oscilloscope probe will load the device. This
is especially pronounced at low voltage operation. It is recom-
mended that a FET probe or unity gain buffer be used for all
testing.
Circuit Topologies
The MIC5014 and MIC5015 are well suited for use with
standard power MOSFETs in both low and high side driver
configurations. In addition, the lowered supply voltage re-
quirements of these devices make them ideal for use with logic
level FETs in high side applications with a supply voltage of 3
to 4V. (If higher supply voltages [>4V] are used with logic level
FETs, an external zener clamp must be supplied to ensure
that the maximum VGS rating of the logic FET [10V] is not
exceeded.) In addition, a standard IGBT can be driven using
these devices.
Choice of one topology over another is usually based on
speed vs. safety. The fastest topology is the low side driver,
however, it is not usually considered as safe as high side
driving as it is easier to accidentally short a load to ground than
to VCC. The slowest, but safest topology is the high side
driver; with speed being inversely proportional to supply
voltage. It is the preferred topology for most military and
automotive applications. Speed can be improved consider-
ably by bootstrapping from the supply.
All topologies implemented using these devices are well
suited to driving inductive loads, as either the gate or the
source pin can be pulled 20V below ground with no effect.
External clamp diodes are unnecessary, except for the case
in which a transient may exceed the overvoltage trip point.
High Side Driver (Figure 1) The high side topology shown
here is an implementation of a “sleep-mode” switch for a
laptop or notebook computer which uses a logic level FET. A
standard power FET can easily be substituted when supply
voltages above 4V are required.
+3V to +30V
10µF
Control Input
ON
OFF
MIC5014
1 V+
NC 8
2 Input
NC 7
3 Source NC 6
4 Gnd
Gate 5
Figure 2. Low Side Driver
1997
5 MIC5014/5015
5 Page 
MIC5014/5015
Micrel
1997
11 MIC5014/5015
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MIC5014-1.PDF ] | |
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