Fairchild Low-Side Gate Drivers FAN31xx & FAN32xx Series Fairchild Low-Side Gate Drivers High-Speed Low-Side Gate Drivers 1A to 9A with Flexible Options to Fit Every Design

FAN31xx and FAN32xx High-Speed Low-Side Gate Drivers Why Use Gate Drivers? High peak currents (often several amps) are needed to switch MOSFETs efficiently To amplify limited PWM output current capability of PWM & digital controllers Remove power dissipation from control ICs Reduce noise problems Place near MOSFET to minimize high-current loops Reduce noise in sensitive control-chip area Implement features not available in PWMs Input level shifting Timing delays Fairchild’s Low-Side Driver Advantages: Compound MillerDrive™ Architecture for Strong Gate Drive Industry’s Smallest Packages: 2x2 mm, 3x3 mm MLP, SOT23-5 and SOIC-8 CMOS, TTL or External Reference Input Thresholds options Options for Two Inputs per Channel for Design Flexibility < 20 ns Propagation Delays for > 1 MHz Switching Low Standby IDD (5 µA) Options (FAN3111) Fail-Safe Inputs: Output Held Low if No Input Signal is present 20V Abs max, >4kV ESD, and >500mA Reverse Current −40 to 125 °C Ambient Operating Temperature Range MillerDriveTM Architecture

FAN3xxx High-Speed Low-Side Gate Drivers Product Family Type Configuration Part Num In. Thres. Packages Released Single 1A Dual Input (CMOS); Non-Inv (Ext) FAN3111 CMOS, Ext SOT23-5, MLP-6 Yes Single 2A Dual Input (+ & -) FAN3100 CMOS, TTL SOIC-8, MLP-8 Dual Input (+ & -), Programmable CS FAN3177 TTL SOIC-8 No Non-Inv, 3V3LDO FAN3180 SOT23-5 Q2’11 Dual 2A Dual Inverting FAN3216 Dual Non-Inverting FAN3217 Dual Inverting + Dual Enable FAN3226 Dual Non-Inverting + Dual Enable FAN3227 Dual Input (+ & -); Pin 3 GND FAN3228 Dual Input (+ & -); Pin 8 GND FAN3229 Dual 4A FAN3213 FAN3214 FAN3223 FAN3224 FAN3225 Single 9A Single Inverting + Enable FAN3121 Single Non-Inverting + Enable FAN3122 Bridge 2A 20V Bridge Driver + Dual Enables FAN3268 30V Bridge Driver + Dual Enables FAN3278 Jan’11 Every current level & input config offers a choice of … Duals may be connected in parallel [selection table_LS drivers_2008-10-10_VN.xls]

FAN3111 IC Driver Benefits vs. Discrete Totem Pole Drivers Can be physically smaller than discrete solutions  highest density designs Fewer parts Integrated features can reduce supporting circuitry Reduce BOM parts count and assembly concerns Higher reliability, less test time Less component-level design which often must be customized for different applications Fast switching (lower loses) from a slow driving signal Direct translation from TTL logic inputs to higher Vgs Easier to introduce RC input delay for critical SR timing applications

FAN3100 Single 2A Driver 2x2mm MLP-6 (smallest available) and SOT23-5 packages 3A peak sink & source (2.5A sink/1.8A src. at Vdd/2) CMOS or TTL input thresholds 10ns fall time with 1nF load Prop delays < 20ns Under-Voltage Lockout Dual Inputs offer either polarity Non-Inverting w/ IN− held LOW Inverting with IN+ held HIGH Fail-Safe Inputs: Output held low if no input signal Non-inverting over inverting

FAN3226/7/8/9 Dual 2A Drivers 3x3mm MLP-8 and SOIC-8 Dual 3A-peak sink & source (2.4A sink/1.6A src. at Vdd/2) CMOS or TTL input thresholds 10ns fall time with 1nF load Prop delays < 20ns Under-Voltage Lockout Industry standard pin-outs Dual Inverting & dual Non-Inverting with dual Enable Dual-Input version (2 x FAN3100) Enable defaults to “ON” Fail-Safe Inputs: Output held low if no input signal

FAN3223/4/5 Dual 4A Drivers 3x3mm MLP-8 and SOIC-8 Dual 5A-peak sink & source (4.3A sink/2.8A src. at Vdd/2) CMOS or TTL input thresholds 10ns fall time with 2.2nF load Prop delays < 20ns Under-Voltage Lockout Industry standard pin-outs Dual Inverting & dual Non-Inverting with dual Enable Dual-Input version Enable defaults to “ON” Fail-Safe Inputs: Output held low if no input signal UVLO

FAN3213/14 and FAN3216/17 Dual 4A and Dual 2A Drivers with No Enables No-Connect instead of Enables for Compatibility SOIC-8 TTL input thresholds Prop delays < 20ns Under-Voltage Lockout Industry standard pin-outs Dual Inverting & Dual Non-Inverting Fail-Safe Inputs: Output held low if no input signal FAN3223TMX  FAN3213TMX (Dual 4A, Inv) FAN3224TMX  FAN3214TMX (Dual 4A, NI) FAN3226TMX  FAN3216TMX (Dual 2A, Inv) FAN3227TMX  FAN3217TMX (Dual 2A, NI) FAN3213T FAN3216T FAN3214T FAN3217T

FAN3121/2 Single 9A Drivers 3x3mm MLP-8 and SOIC-8 11A peak sink & source (10A/7A sink/source at Vdd/2) CMOS or TTL input thresholds 19/23ns FT/RT with 10nF load 20ns typical prop delays Under-Voltage Lockout Industry standard Inverting and Non-Inv. pin-outs with Enable Fail-Safe Input: Output held low if no input signal Enable defaults to “ON”

FAN3268/78 Low-Voltage Bridge Drivers 2A Low-Voltage PMOS-NMOS Bridge Drivers FAN3268: 4.5 V to 18 V Operating Range FAN3278: 8 V to 27 V Operating Range Drives High-Side PMOS and Low-Side NMOS for Battery-Powered Compact Brushless-dc Motor Drives in Industrial, Medical and Automotive applications such as 12-V blower motors. Two Independent Enable Pins for Design Flexibility Operation Default to ON if not connected Suitable with FDD8424H Dual MOSFETs (40 V, 20 A) in 4-lead DPAK TTL input thresholds SOIC package –40°C to +125°C ambient

FAN3268 and FAN3278 2A Low-Voltage PMOS-NMOS Bridge Drivers Fairchild Semiconductor’s FAN3268 and FAN3278 are a special low-voltage high-performance bridge drivers for fan/pump DC motor drive applications with PMOS/NMOS Half-Bridge configuration. Battery-Powered Compact Brushless-dc Motor Drives in Industrial, Medical and Automotive applications such as 12V blower motors. Interface between a sensitive PWM or DSP and the MOSFETs. This device also features robust ESD protection Key Features TTL input thresholds to provide buffer and level translation functions from logic inputs. Internal circuitry provides an under-voltage lockout function that prevents the switching if the VDD supply voltage is below the operating level. If an input is left unconnected, internal resistors bias the inputs such that keeps the external MOSFETs OFF. Included also are two enable pins, a key feature during medical device power-up, that default to ON if not connected.

FAN3268 and FAN3278 Typical 3-Phase Blower Motor Application

FAN3278 vs. FAN3268 Key Differences Supply Voltage 27 V Operating Maximum 30 V Absolute Maximum 18 V Operating Maximum 20 V Absolute Maximum Gate Drive Regulator Yes, since the maximum operating VDD can be as high as 27 V, the gate voltage to the external MOSFETs is limited to about 13V. No gate drive regulator needed. The gate drive voltage is VDD and the FAN3268 switches rail-to-rail. Minimum Operating Voltage The optimum operating range is 8 V to 27 V. After the IC turns on at about 3.8 V, the output tracks VDD up to the regulated voltage rail of about 11~13 V. Below 8 V of VDD, the FAN3278 operates, but (a) slower and (b) with limited gate drive voltage until it reaches around 8 V. 4.1 V is the UVLO turn-off voltage which is the minimum operating voltage. Start-up The IC starts operating approximately at 3.8 V which acts as a loose UVLO threshold. It incorporates a “smart startup” feature where the outputs are held OFF before the IC starts operating. Has the tight UVLO threshold of 4.5V on / 4.1V off. Incorporates “smart startup” (outputs held OFF before IC is fully operational at the UVLO threshold). Output Gate Drive Architecture Standard MOS-based output structure with gate drive clamp feature. Compound MillerDrive™ architecture in the final output stage to provide a more efficient gate drive current during the Miller plateau stage of the turn-on/turn-off switching transition. OUTB Gate Drive Current Strength for P-Channel MOSFETs Optimized for P-channel: The turn-OFF (1.5 A) is stronger than turn-ON (1.0A). P-channel turn-ON (2.4A) is stronger than turn-OFF (1.6A).

FAN3180 (Product Preview) Low-Side Gate Driver + 3.3V LDO ±3 A Peak Drive Current at VDD = 12 V +2.5 A/-1.8 A at VOUT = 6 V Non-inverting Logic Configuration TTL Input Compatible Threshold 15 ns Typical Prop. Delay Times 9 ns tF/ 13 ns tR with 1nF Load MillerDrive™ Compound Technology LDO 3.3 V, 10 mA Output ±1% at 25°C, ±2.5% Total Variation General 5 V to 18 V Operating Range 200µA Maximum Total Static Supply Current 5-Pin SOT-23 Package –40°C to 105°C Operation FAN3180 Samples Available Now

Server, Industrial, Comm. Gate Drivers Released Server, Industrial, Comm. Gate Drivers In Development Planned Under Consideration Low-side Gate Drivers Low-Voltage Bridge Drivers Specialized Low-Side Gate Drivers FAN3223-5 Dual 4A FAN3213/14 Dual 4A – No ENB FAN3215 Dual 4A FAN3226-9 Dual 2A FAN3216/17 Dual 2A – No ENB FAN3218 FAN3100 Single 2A Dual 2A with 1INV+1NINV Single 1A FAN3111 Single 9A FAN3121-2 FAN3268 FAN3278 20V Bridge Driver 30V Bridge Driver FAN3180 LS Driver + 3V3LDO FAN3247 SmartMeter Disconnect Switch Driver Existing 2010 Release 2011 Release + Future 

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Additional Material on Low-Side Gate Drivers

FAN3xxx High-Speed Low-Side Gate Drivers Common Applications SMPS topologies with ground-referenced power switches (forward, boost, push-pull, active clamp) Synchronous rectifiers in SMPS (often multiple high-gate-charge MOSFETs in parallel) High-Power PFC Gate Drive Transformer coupled gate drives (high- & low-side switches) & transformer coupled logic-signal transmission Drive MOSFETs or IGBTs Used where PWM controllers need assistance: PWM outputs cannot provide acceptable switching times PWM cannot dissipate the drive power Time delays and/or inversions are needed for some switches Additional control is needed for startup, shutdown or faults [Fairchild also offers high-side drivers and synchronous Buck drivers]

FAN3224 Dual 4A Low-Side Driver Double-Ended Synchronous Rectification High Current Outputs; often have paralleled MOSFETs Half-bridge, Full-bridge topologies (simplified examples shown) Ground referenced SRs work in center-tapped or current doubler Used in servers and telecom rectifiers SRs used in outputs 1-12V (or higher voltages up to 48V) [SR double_2006_05_05_SM.ppt – 7 slides]

FAN3224 and FAN3225 Dual 4A Drivers Gate Drive Transformers in Phase-Shifted Full-Bridge Simplified Phase-Shifted Full-Bridge Application Shown Two Dual Drivers (FAN3225C) & two transformers for Primary-Side Gate Drive One dual driver (FAN3224T) for Double-Ended Secondary-Side SR Drivers [SR double_2006_05_05_SM.ppt – 7 slides]

FAN3122 Single 9A Low-Side Driver Current Doubler - Paralleled FETs

FAN31xx and FAN32xx Family High-Speed Low-Side Drivers Type Configuration Part Num In. Thres. Packages Released Single 1A Dual Input (CMOS); Non-Inv (Ext) FAN3111 CMOS, Ext SOT23-5, MLP-6 Yes Single 2A Dual Input (+ & -) FAN3100 CMOS, TTL SOIC-8, MLP-8 Non-Inv, 3V3LDO FAN3180 TTL SOT23-5 No, Q1’11 Dual 2A Dual Inverting FAN3216 SOIC-8 Dual Non-Inverting FAN3217 Dual Inverting + Dual Enable FAN3226 Dual Non-Inverting + Dual Enable FAN3227 Dual Input (+ & -); Pin 3 GND FAN3228 Dual Input (+ & -); Pin 8 GND FAN3229 Dual 4A FAN3213 FAN3214 FAN3223 FAN3224 FAN3225 Single 9A Single Inverting + Enable FAN3121 Single Non-Inverting + Enable FAN3122 Bridge 2A 20V Bridge Driver + Dual Enables FAN3268 30V Bridge Driver + Dual Enables FAN3278 Every current level & input config offers a choice of … Duals may be connected in parallel [selection table_LS drivers_2008-10-10_VN.xls]

Low-Side Drivers Primary-Side PWM Applications Primary PWM drives primary switches and signals SR MOSFETs Power path in RED PWM to SR gates path in BLUE Primary Switch Driver often high/low driver (HV Gate Driver- HVIC)

Low-Side Drivers Secondary-Side PWM Applications Secondary PWM coordinates primary switches and SR Driver Power path in RED PWM to SR gate path in BLUE Higher power SMPS often have bias supply

Transformer-Coupled Gate Drive Example Phase shifted full bridge with secondary-side control Primary uses two dual drivers and two transformers Current doubler rectifier in secondary has dual drivers for ground referenced MOSFETs

High-Side Drive with a LS Driver Q1 VDD CC CCS RS R2 Q2 R1 D1 D2 T1 IC1 VS A practical high-side drive circuit using a low-side driver and a gate-drive transformer. R1 is a bleeder resistor for shutdown; Q2, R2 & D2 form a turn-off speed-up circuit, D1 & CSS are a charge pump to restore the dc level on the secondary, CC is the dc blocking capacitor to keep the transformer from saturating, and RS is a damping resistor. (The driver bypass capacitors are not shown.)

Distributed Gate Drive Example

Solenoid Relay Driver in Smart Meters FAN3227TMX Dual 2-A High-Speed Low-Side Driver High-Current Pulse Drive Contactor Disconnect

What is MillerDrive™? Compound drive in FAN3xxx Series (left) combines bipolar high current capability with MOSFETs for rail-to-rail operation and high voltage capability MOSFET-technology drivers (right) are composed of integrated PMOS / NMOS power devices similar to discrete counterparts

Current Rating Comparisons for IC Drivers Compound drivers rate IOUT with VOUT at VDD/2 Reflects current capability during midrange of output swing FAN322x specs peak current for comparison purposes MOSFET-based drivers rate current approximately IOUT,PK MOS-based drivers specify RDS,high or RDS,low when fully enhanced Actual and rated current is less than I=VDD/RDS,min In both, current sink/source magnitude is limited by internal design and specified with no external resistance Average current available from a driver is limited by power dissipation

High Speed FAN3100 with 2.2nF load Input 90% to Output 10% < 35 ns This is faster than many competitor’s propagation delay alone! MillerDriveTM Architecture

Tight Matching Between Channels FAN3224 with 4.7nF load Typically measure < ½ ns difference between channels (waveform distortion is from external parasitics) Excellent performance with 2 channels paralleled

Input Configurations Single-input drivers Dual-input drivers Inverting or Non-Inverting logic Enable input for each channel Dual-input drivers Non-inverting operation using IN+ (with IN− held low) Inverting operation using IN− (with IN+ held high) Enable function can be implemented Truth table shows logical operation

UVLO Operation Output is LOW until Vdd exceeds UVLO turn-on threshold: GND IN − IN+ OUT PWM FAN 3100 VDD GND IN − IN+ OUT PWM FAN 3100 Non-Inverting Configuration Inverting Configuration

TTL Input Thresholds Translates logic inputs to higher drive voltages Input threshold compatible with digital controllers Threshold limits independent of Vdd Vin,high,min ≥ 2.0 V Vin,low,max ≤ 0.8 V [plot fr FAN3223-25_TypCharPlots_2007_11_19.xls] [driver input options_2006-05-11_MD.ppt]

CMOS Input Thresholds CMOS input threshold scales with Vdd Vth-high  0.6 x Vdd Vth-low  0.4 x Vdd Hysteresis approx. 0.2 x Vdd CMOS input facilitates adding R-C time delays at the input

Thank You

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