Dual High Speed Low-Side MOSFET Driver PRELIMINARY Features

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Dual High Speed Low-Side MOSFET Driver PRELIMINARY Features

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SC1302A/B/C family cost dual low-side MOSFET drivers. These drivers accept TTL-compatible inputs capable supplying high current outputs peak) external MOSFET's. Fast switching allows operation MHz. SC1302A/B/C available three configurations: dual non-inverting, dual inverting inverting plus non-inverting output. under-voltage-lock-out circuit guarantees that driver outputs when less than 4.5V (typ). internal temperature sensor shuts down driver event over temperature. 8-pin MSOP SOIC package uses minimum space.
Dual High Speed Low-Side MOSFET Driver
PRELIMINARY Features
+4.5V +16.5V operation Fast rise fall times (20ns typical with 1000pf load) Dual MOSFET driver peak drive current 40ns propagation delay 8-pin MSOP/SOIC packages Enable/disable control TTL-compatible input Under voltage lockout with hysterisis shutdown supply current Over temperature protection protection Dual inverting/non-inverting inverting/non-inverting configurations
SC1302A/B/C
Applications
Switch-mode power supplies Battery powered applications Solenoid motor drives
Typical Application Circuit
+12V load
10uF
0.1uF Load SC1302A Load
InputA
InputB
Preliminary, June 2002
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SC1302A/B/C
POWER MANAGEMENT Absolute Maximum Ratings
Parameter Supply Voltage Operating Supply Voltage Input Voltages Peak utput Currents Enable Voltage Shutdown Voltage Continuous Power Dissipation Operating Temperature Range Thermal Resistance Junction Ambient (MSOP) Thermal Resistance Junction Ambient Storage Temperature Range Lead Temperature (Soldering)10 Symbol INA, OUTA, OUTB SHDN LEAD -0.3 -0.3 16.5 -0.3 -0.3 -0.3 Internally limited +150
PRELIMINARY
Units °C/W °C/W
Electrical Characteristics
Unless otherwise specified: 25°C, 12V, VSHDN
Parameter Supply Current uiescent Current uiescent Current uiescent Current Under-Voltage Lockout Threshold Voltage Hysteresis Enable Enable Voltage Disable Voltage Delay utput Delay utput Enable Input Current Input High Level Input Voltage Level Input Voltage Input Current
Symbol
Conditions
Units
START SHDN SHDN
START
SHDN SHDN
D_EN D_DIS
from high from high
Non-Inverting Input(s) SC1302A/C Inverting Input(s) SC1302B/C
2002 Semtech Corp.
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SC1302A/B/C
POWER MANAGEMENT Electrical Characteristics (Cont.)
Unless otherwise specified: 25°C, 12V,
PRELIMINARY
Parameter Output Output Peak Current
Symbol
Conditions
Units
IPK_SOURCE IPK_SINK
VOUT 0.5V, 10uS VOUT 0.5V, 10uS
1600 1600
Shutdown SHDN Input Voltage High SHDN Input Voltage SHDN Current Thermal Shutdown Over Temperature Trip Point Hysteresis TJ_OT VSHDN VSHDN ISHDN VSHDN
Electrical Characteristics
Unless otherwise specified: 25°C, 12V, 1000pF
Parameter Rise time Fall time Propagation delay time Propagation delay time
Symbol
Conditions Timing Diagram Timing Diagram Timing Diagram Timing Diagram
Units
Timing Diagrams
Input
SC1302A SC1302B
2002 Semtech Corp.
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SC1302A/B/C
POWER MANAGEMENT Configuration
View SC1302A (Dual Non-Inverting)
SHDN OUTA OUTB
PRELIMINARY Ordering Information
Part Number SC1302AIMSTR SC1302BIMSTR SC1302CIMSTR SC1302AISTR SC1302BISTR SC1302CISTR SOIC-8 -40°C +85°C MSOP-8 Package Temp. Range (TA) -40°C +85°C
(8-Pin MSOP SOIC)
Note: Only available tape reel packaging. reel contains 2500 devices.
View SC1302B (Dual Inverting)
View SC1302C (Inverting Non-Inverting)
SHDN OUTA OUTB
SHDN OUTA OUTB
(8-Pin MSOP SOIC)
(8-Pin MSOP SOIC)
Descriptions
SC1302A OUTB OUTA SHDN SC1302B OUTB OUTA SHDN SC1302C OUTB OUTA SHDN Function Enable/disable control. When driven low, both outputs low. When left open, both outputs low. Enable both drivers tying voltage greater than TTL-compatible input driver When left open, low. Ground. TTL-compatible input driver When left open, low. Output gate drive external MOSFET. Supply: +4.5V +16.5V supply. During UVLO, outputs held low. Output gate drive external MOSFET. Shutdown pin. Apply voltage from enable device. Pull below 0.3V lowpower shut down.
2002 Semtech Corp.
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SC1302A/B/C
POWER MANAGEMENT Block Diagrams
PRELIMINARY
BIAS
DRIVER
OUTA BIAS
DRIVER
OUTA
SHDN
BANDGAP SHDN
BANDGAP
BIAS
DRIVER
BIAS
OUTB
DRIVER
OUTB
SC1302A
SC1302B
BIAS
DRIVER
OUTA
SHDN
BANDGAP
BIAS
DRIVER
OUTB
SC1302C
2002 Semtech Corp.
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SC1302A/B/C
POWER MANAGEMENT Applications Information
SC1302A/B/C high speed, high peak current dual MOSFET driver. designed drive power MOSFETs with ultra-low rise/fall time propagation delays. switching frequency controllers increased reduce power converters volume cost, fast rise fall times necessary minimize switching losses. While discrete solution achieve reasonable drive capability, implementing delay other housekeeping functions necessary safe operation become cumbersome costly. SC1032A/B/C presents total solution high-speed, high power density applications. Wide input supply range 4.5V 16.5V allows battery powered applications well distributed power systems.
PRELIMINARY
where load capacitance output voltage swing driver.
During turn off, same amount energy dumped ground. Therefore, energy dissipated switching cycle
ETOTAL
power dissipation gate driving actions given
PGATE
where, switching frequency. with =12V, C=1nF f=200kHz, power dissipation output
Supply Bypass Layout
4.7µF 10µF tantalum bypass capacitor with (equivalent series resistance) additional 0.1µF ceramic capacitor parallel recommended supply bypass control switching supply transients. with high speed, high current circuit, proper layout critical achieving optimum performance SC1302A/B/C. Attention should paid proper placement driver, switching MOSFET bypass capacitors. driver should placed close possible external MOSFET's eliminate possibility oscillation caused trace inductance MOSFET gate capacitance. resistor range could used series with gate drive damp ringing drive output path short enough. bypass capacitors should also placed closely between driver.
PGATE (200kHz) (1nF) (12)2 29mW
corresponding supply current
PGATE 29mW 2.4mA
Thermal Information
driver's junction temperature must kept within rated limit time. application system effectively remove heat generated driver order proper functions performance. junction temperature reaches internal protection circuit will triggered shut down gate driver. power dissipation SC1302A/B/C should derated according following formula:
Power Dissipation 125°C
Drive Capability Power Dissipation
SC1302A/B/C able deliver 1.6A peak current driving capacitive loads, such MOSFET's. Fast switching MOSFET's significantly reduces switching losses high frequency applications. Thermal stress reduced system reliability improved. simplicity, assume that gate capacitance MOSFET constant. power delivered from power supply estimated based this simplification. energy needed charge capacitor given
2002 Semtech Corp.
where ambient temperature.
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SC1302A/B/C
POWER MANAGEMENT Outline Drawing MSOP-8 PRELIMINARY
Land Pattern MSOP-8
2002 Semtech Corp.
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SC1302A/B/C
POWER MANAGEMENT Outline Drawing SO-8 PRELIMINARY
Land Pattern SO-8
Contact Information
Semtech Corporation Power Management Products Division Flynn Rd., Camarillo, 93012 Phone: (805)498-2111 (805)498-3804
2002 Semtech Corp.
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Dual High Speed Low-Side MOSFET Driver PRELIMINARY Features

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