FAN5336UMPX资料

FAN5336 — 1.5MHz Boost Regulator with 33V Integrated FET SwitchApril 2007FAN53361.5MHz Boost Regulator with 33V Integrated FET SwitchFeatures■1.5MHz Switching Frequency■Low Noise■Adjustable Output Voltage■Up to 1.5A Peak Switch Current■Low Shutdown Current: <1µA■Cycle-by-Cycle Current Limit■Over-Voltage Protection at the Feedback Pin■Fixed-Frequency PWM Operation■Soft-Start Capability■Internal Compensation■Thermal Shutdown■Excellent Load Regulation: 0.2%■Low Ripple■6-Lead 3x3mm MLPtmDescriptionThe FAN5336 is a high-efficiency, low-noise, fixed-fre-quency PWM, current-mode, DC-DC boost regulator. Itis designed for small LCD bias supply and white LEDbacklight supply applications. Depending on the applica-tion, a FAN5336 regulator can output up to 33V at up to50mA output current. With output voltage up to 21V, theoutput current can be up to 100mA. FAN5336 can beused for power conversion as low as 9V output voltage. A current-mode control loop has a fast transientresponse that provides excellent load regulation within0.2% of output voltage. The FAN5336 switches at fixed1.5MHz frequency, allowing the use of small, low-costexternal components. Constant frequency switchingresults in low input noise and small output capacitors.FAN5336 provides cycle-by-cycle current limiting up to1.5A peak current. The FAN5336 may be used to drive a serial flash LEDwith up to 100mA current at 21V for a maximum of400ms on-time and 10% duty cycle.A low-EMI mode reduces interference and radiated elec-tromagnetic energy caused by the ringing of the inductor. Additional features include thermal shutdown, over-volt-age protection, cycle-by-cycle current limit, low ripple,and soft-start support.The device is available in a 3x3mm 6-lead MLP, 0.8mmthickness package. Applications■Portable Displays■Mobile Phone / Smart Phone LED Backlights■Display Bias■PDA, DVD, Camcorder Backlights■Pager and Cordless Phone Displays■Portable Medical Diagnostic Equipment■Remote Controls■MP3 or PMP or DSC Players■Serial Flash LED DriversApplication DiagramVIN CIN10µF1V2 L16.8µH6SW P1 5NC FB4D1 OUT CVOUTCFR1180pF4.7µF INGNDONOFF3SHDNR2Figure 1. Typical Application Diagram© 2004 Fairchild Semiconductor CorporationFAN5336 Rev. 1.0.1

www.fairchildsemi.com元器件交易网www.cecb2b.com

FAN5336 — 1.5MHz Boost Regulator with 33V Integrated FET SwitchOrdering InformationPart NumberFAN5336MPXFAN5336UMPXPackage6-Lead 3x3mm MLP6-Lead 3x3mm UMLPTemperature Range-40°C to +85°C-40°C to +85°CPb-FreeYesYesPacking MethodTape and ReelTape and ReelPin AssignmentsVINGNDSHDN1236SWNCFBP154Figure 2. 6-Lead, 3x3mm MLP (Top View)Pin DescriptionsPin #NameDescriptionP1 GND Analog and Power Ground. P1 must be soldered to the PCB ground. 123456VIN Input Voltage Pin. GND Ground. SHDN FB NCShutdown Control Pin. Logic HIGH enables, logic LOW disables the device. Feedback Pin. Feedback node that connects to an external voltage divider. No Connect.SW Switching Node. © 2004 Fairchild Semiconductor CorporationFAN5336 Rev. 1.0.1

www.fairchildsemi.com2

元器件交易网www.cecb2b.com

FAN5336 — 1.5MHz Boost Regulator with 33V Integrated FET SwitchAbsolute Maximum Ratings

Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-ble above the recommended operating conditions and stressing the parts to these levels is not recommended. In addi-tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. Theabsolute maximum ratings are stress ratings only.

Symbols

VIN

VIN to GND FB, SHDN to GND SW to GND

TLTJTSTGΘJAESD

ParameterMin.

-0.3 -0.3

Max.

6.0 VIN + 0.3 35300 150 265

Unit

V V V °C °C °C/W kV

Lead Soldering Temperature (10 seconds) Junction Temperature Thermal Resistance

Electrostatic Discharge Protection Level(1)

Storage Temperature -55 150 °C HBM 2 CDM 1 Note:

1.Using EIA/JESD22A114B (Human Body Model) and EIA/JESD22C101-A (Charge Device Model).

Recommended Operating Conditions

The Recommended Operating Conditions table defines the conditions for actual device operation. Recommendedoperating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does notrecommend exceeding them or designing to absolute maximum ratings.

Symbols

VINVOUTTACOUT

Input VoltageOutput Voltage

ParameterMin.

2.79-402.2(2)Typ.Max.

5.533

Unit

VV°CµF

Ambient Operating TemperatureOutput Capacitance

258510

Note:

2.This load capacitance value is required for loop stability. Tolerance, temperature variation, and voltage dependency

of the capacitance must be considered. Typically a 4.7µF ceramic capacitor is required to achieve the specifiedvalue at VOUT = 33V.

© 2004 Fairchild Semiconductor CorporationFAN5336 Rev. 1.0.1

www.fairchildsemi.com

3

元器件交易网www.cecb2b.com

FAN5336 — 1.5MHz Boost Regulator with 33V Integrated FET SwitchElectrical CharacteristicsVIN = 2.7 to 5.5V, VSHDN = VIN, and TA = -40°C to +85°C. Typical values are at TA = 25°C and VIN = 3.6V unless otherwise noted. ParameterOutput Voltage Accuracy Switch Current Limit Load Current Switch On-Resistance Quiescent CurrentOFF Mode Current Shutdown ThresholdShutdown Pin Bias Current Feedback Voltage (VREF)Feedback Pin Bias Current Feedback Voltage Line Regulation(3)Switching Frequency Maximum Duty Cycle Start-up Turn-on TimeLoad RegulationSwitch Leakage Current VIN = 3.6VConditionsRefer to the Test Circuit in Figure 3.Min.-31.1 75100Typ.Max.+3Units% A mA VIN = 3.2V VOUT = 21V ±5%, VIN ≥ 3.0V VOUT = 21V ±5%, VIN ≥ 3.2V, TON < 0.4s, TOFF > 3.6sVIN = 3.6VNo Switching, VFB ≥ 1.27VSwitchingVSHDN = 0VDevice ON Device OFF VSHDN = 0V or VSHDN = 5.5V ILoad = 0mA, VIN = 3.6V at 25°C1.51.8 0.40.7 6.50.1 1.50.51 1.205 1.230 1 10 1.255 10 1.51.855.01 3.0 ΩmA µAV nA V nA %/VMHz% ms %µA3.0V < VIN < 5.5V, ILOAD = 0mA1.1587VIN = 3.0V, IOUT = 75mAVIN = 3.6V, 1mA < ILoad <100mANo Switching, VIN = 5.5V 0.41.50933.00.2Note:ΔVOUT13.The line regulation is calculated based on ------------------×--------------. ΔVINVOUTTest CircuitVIN CIN10µF1V22.7V to 5.5V L6.8µH6SW P1 NC 5FB4BAT54 OUT CVOUTCFR1160k180pF4.7µF INGNDONOFF3SHDNR210kFigure 3. Test Circuit© 2004 Fairchild Semiconductor CorporationFAN5336 Rev. 1.0.1

www.fairchildsemi.com4

元器件交易网www.cecb2b.com

FAN5336 — 1.5MHz Boost Regulator with 33V Integrated FET SwitchTypical Performance CharacteristicsVIN=3.6V, VOUT=21V, TA=25°C, CIN=10µF, COUT=4.7µF, L=6.8µH, CF=180pF, R1=160kΩ, R2=10kΩ unless otherwise noted.Efficiency vs. Load Current9085807570656055504540102030405060708021.521.321.120.9Load RegulationVin=2.7VVin=3.6VVin=5.5VOutput Voltage (V)Efficiency (%)Vin=2.7V20.720.5102030405060708090100Vin=3.6VVin=5.5V90100Load Current (mA)Load Current (mA)Figure 4. Efficiency vs. Load CurrentFigure 5. Load RegulationLine Regulation at No Load2221.821.621.421.22120.820.620.420.2202.533.544.555.5Output Voltage(V)Battery Voltage(V)Figure 6. Line Regulation at No LoadFigure 7. 100mA Load Current OperationFigure 8. Start-up ResponseFigure 9. Load Transient Response© 2004 Fairchild Semiconductor CorporationFAN5336 Rev. 1.0.1

www.fairchildsemi.com5

元器件交易网www.cecb2b.com

FAN5336 — 1.5MHz Boost Regulator with 33V Integrated FET SwitchBlock DiagramSHDN3ShutdownCircuitryVIN1SW6FB+Comp-1.15 x V REFThermalShutdownFB4-ErrorAmp++Comp-RRRSQDrivernRampGeneratorOscillatorCurrent LimitComparator-++Amp-ReferenceSoft-Start5NC0.032GNDFigure 10. Block DiagramCircuit DescriptionThe FAN5336 is a pulse-width modulated (PWM)current-mode boost converter. The FAN5336 improvesthe performance of battery-powered equipment bysignificantly minimizing the spectral distribution of noiseat the input caused by the switching action of the regula-tor. To facilitate effective noise filtering, the switchingfrequency was chosen to be high, 1.5MHz. An internalsoft-start circuit minimizes in-rush currents. The timing ofthe soft-start circuit was chosen to reach 95% of thenominal output voltage within 5ms following an enablecommand when VIN = 2.7V, VOUT = 21V, ILOAD = 35mAand COUT (EFFECTIVE) = 4.7µF. The device architecture is a current-mode controller withan internal sense resistor connected in series with the N-channel switch. The voltage at the feedback pin tracksthe output voltage at the cathode of the external Schottkydiode (shown in the test circuit in Figure 3). The erroramplifier amplifies the difference between the feedbackvoltage and the internal bandgap reference. The ampli-fied error voltage serves as a reference voltage to thePWM comparator. The inverting input of the PWMcomparator consists of the sum of two components: theamplified control signal received from the 30mΩ currentsense resistor and the ramp generator voltage derivedfrom the oscillator. The oscillator sets the latch and thelatch turns on the FET switch. Under normal operatingconditions, the PWM comparator resets the latch andturns off the FET, terminating the pulse. Since the com-parator input contains information about the output volt-age and the control loop is arranged to form a negativefeedback loop, the value of the peak inductor current isadjusted to maintain regulation. Every time the latch is reset, the FET is turned off andthe current flow through the switch is terminated. Thelatch can be reset by other events as well, such as over-current and over-voltage conditions. Over-current condi-tion is monitored by the current-limit comparator, whichresets the latch and turns off the switch within each clockcycle. An over-voltage condition at the feedback (FB) pinis detected by a fast comparator limiting the duty cycle ina similar manner to over-current monitoring. © 2004 Fairchild Semiconductor CorporationFAN5336 Rev. 1.0.1

www.fairchildsemi.com6

元器件交易网www.cecb2b.com

FAN5336 — 1.5MHz Boost Regulator with 33V Integrated FET SwitchApplications Information

Setting the Output Voltage

The internal feedback voltage reference (VREF) is 1.23V(typical). The output voltage is divided by a resistordivider, R1 and R2 to the FB pin. The output voltage iscalculated by: VOUT

R1⎞⎛⎜=VREF⎜1+------⎟

R2⎟⎝⎠

EQ 1

Table 3: Recommended Capacitors

Cap. Value Vendor Part Number

10µF Murata GRM31CR70J106KA01B 4.7µF Murata GRM32RR61E475KC31B A feedforward capacitor (CF) is required for stability. Therecommended value is around 180pF.

Diode Selection

The external diode used for rectification is usually aSchottky diode. Its average forward current shouldexceed the load current and its reverse voltage maxi-mum ratings should exceed the voltage at the output ofthe converter. A barrier Schottky diode, such as BAT54,is preferred due to its low reverse current over thetemperature range.

Care should be taken to avoid any short circuit of VOUTto GND, even with the IC disabled, since the diode canbe instantly damaged by the excessive current.

The maximum output current depends on the output volt-age settings. Table 1 provides the recommended voltagefor several steady-state configurations:Table 1: Recommended Voltages

R1 (kΩ) for VOUT ILOAD Max.

(V)(mA)R2 = 10kΩ

9912213333

50170125755010

63.263.287.5160258258

VIN Range

(V)2.7 to 5.52.9 to 4.72.7 to 5.53.6 to 5.54.0 to 5.52.7 to 5.5

Flash LED Driver

The FAN5336 may be used to drive a serial flash LED with up to 100mA current at 21V for a maximum of 400ms on-time and 10% duty cycle.

Inductor Selection

The inductor parameters directly related to device perfor-mance are saturation current and DC resistance. TheFAN5336 operates with a typical inductor value of 6.8µH.The lower the DC resistance, the higher the efficiency.Balancing inductor size, cost, and overall efficiencyallows optimum choice.

The inductor saturation current should be rated around1.5A, which is the threshold of the internal current limitcircuit. This limit is reached only during the start-up andwith heavy load conditions. When this occurs, the con-verter can shift into discontinuous conduction mode dueto the automatic turn-off of the switching transistor,resulting in higher ripple and reduced efficiency.

Table 2: Recommended Inductors Inductor

Value Vendor Part Number Comment Lower 6.8µH TDK SLF7028T6R8M1R3 Profile 6.8µH MurataLQS66C6R8M04

Higher Efficiency

Thermal Shutdown

When the die temperature exceeds 150°C, a resetoccurs and remains in effect until the die cools to 130°C,when the circuit is allowed to restart.

PCB Layout Recommendations

The inherently high peak currents and switching fre-quency of power supplies require careful PCB layoutdesign. For best results, use wide traces for high-currentpaths and place the input capacitor, the inductor, and theoutput capacitor as close as possible to the integratedcircuit terminals. The resistor divider that sets the outputvoltage should be routed away from the inductor to avoidRF coupling. A four-layer PCB, with at least one groundplane connected to Pin 2 of the IC, is recommended. Theground plane acts as an electromagnetic shield toreduce EMI and parasitic coupling between components.

Capacitors Selection

For best performance, low-ESR input and output capaci-tors are required. Ceramic capacitors of CIN = 10µF andCOUT = 4.7µF, placed as close as possible to the IC pins,are recommended for the lower input and output ripple.The output capacitor voltage rating should be selectedaccording to the VOUT setting.

© 2004 Fairchild Semiconductor CorporationFAN5336 Rev. 1.0.1

Figure 11. Recommended PCB Layout

www.fairchildsemi.com

7

元器件交易网www.cecb2b.com

FAN5336 — 1.5MHz Boost Regulator with 33V Integrated FET SwitchMechanical DimensionsDimensions are in millimeters unless otherwise noted.Figure 12. 6-Lead 3x3 Molded Leadless Package (MLP)© 2004 Fairchild Semiconductor CorporationFAN5336 Rev. 1.0.1

www.fairchildsemi.com8

元器件交易网www.cecb2b.com

FAN5336 — 1.5MHz Boost Regulator with 33V Integrated FET SwitchMechanical DimensionsDimensions are in millimeters unless otherwise noted.2.450.15C3.0AB2X1.653.0(0.70)2.103.500.15C0.95 TYP130.65 TYP2X0.6 MAX0.10C(0.20)0.050.000.08CCSEATINGPLANE2.00 PIN #1 IDENT10.450.2031.210.2 MIN0.9561.9040.30~0.450.10CABC0.05A. CONFORMS TO JEDEC REGISTRATION MO-229,VARIATION VEEA, DATED 8/2003, EXCEPT THICKNESS B. DIMENSIONS ARE IN MILLIMETERS. C. DIMENSIONS AND TOLERANCES PERASME Y14.5M, 1994D. FILENAME AND REVISION: UMLP06Arev1Figure 12. 6-Lead 3x3 Ultrathin Molded Leadless Package (UMLP)© 2004 Fairchild Semiconductor CorporationFAN5336 Rev. 1.0.1

www.fairchildsemi.com9

元器件交易网www.cecb2b.com

FAN5336 — 1.5MHz Boost Regulator with 33V Integrated FET Switch© 2004 Fairchild Semiconductor CorporationFAN5336 Rev. 1.0.1

www.fairchildsemi.com

10