STEP-UP DC/DC CONVERTER BACKLIGHT DRIVER LN2117 SERIES DESCRIPTION FEATURES APPLICATIONS PACKAGE BLOCK DIAGRAM
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1 STEP-UP DC/DC CONVERTER BACKLIGHT DRIVER LN2117 SERIES DESCRIPTION The is a fixed frequency, constant current step-up DC/DC converter ideal for driving LEDs used in backlighting applications on cellular phones, PDAs and digital cameras etc. Output voltage of up to 17.5V can be derived, and from a 3.2V input four white Led s cab be driven in series or alternatively, using a 2.5V input, a network of two parallel legs with three in each may be driven. Luminance of the LED s is controlled by changing the duty cycle of a PWM signal applied to the CE pin. In addition, an internal MOSFET with an Rds-on of 2Ω is used. Allow profile and small board area solution can be achieved using a chip coil and an ultra small ceramic output capacitor (CL) of 0.22uF. FEATURES Input voltage range : 2.5V 6V Output voltage range : up to 26V Oscillation frequency : 1MHz±20% Efficiency : 88%(When driving 3 white LEDs in series VIN=3.6V ILED=20mA) Control : PWM control Stand-by Current : ISTB=1.0uA(MAX) Load capacitor : 0.22uF,ceramic LX limit Current : 300mA APPLICATIONS For White LED Drivers Mobil phones, PHS PDAs Digital still cameras PACKAGE SOT-23-6 BLOCK DIAGRAM Figure 1 Shanghai Natlinear Electronics Co. Ltd
2 ABSOLUTE MAXIMUM RATINGS Step-up DC/DC Converter Backlight Driver Item Symbol Absolute maximum ratings Unit VIN Pin Voltage VIN Vss-0.3~Vss+7 OUT Pin Voltage VOUT Vss-0.3~Vss+7 V LX Pin Voltage VLX Vss-0.3~Vss+22 FB Pin Voltage Vfb Vss-0.3~Vss+7 V CE Pin Voltage Vce Vss-0.3~Vss+7 V OVP Pin Voltage Vovp Vss-0.3~Vss+22 LX Pin Current ILX 1000 ma Power Dissipation PD SOT mw Operating Temperature range Topr -40~+85 Storage Temperature range Tstg -55~+125 ELECTRICAL CHARACTERISTICS (Ta=25 C,except specify) Item Symbol Condtion Min. Typ. Max. Unit Circuits FB Control Voltage(*1) VFB Output Voltage range VOUT - VIN - 26 Lx Operating Voltage V 1 VLX range Operating Voltage range VIN Stand-by Current ISTB VCE=0V VLX=5V - 1 A 3 Supply Current 1 IDD A Supply Current 2 IDD2 VIN=VLX VFB=0.4V Oscillation Frequency FOSC MHz 2 Maximum Duty Cycle MAXDTY VCONT=0.4V % 2 Efficiency EFFI VIN=3.6V;RLED=20Ω % 1 Current Limit ILIM VIN= ma 4 OVP Overvoltage Limit OVPVL 26 V 2 LX On Resistance VIN=3.6V VLX=0.4V 2.0 Ω 2 LX Leak Current ILXL 0 1 A 3 CE H Voltage VCEH 0.65 V 2 CE L Voltage VCEL 0.2 V 2 CE H Current ICEH VIN=VLX VFB=0.4V 0.1 A 3 CE L Current ICEL VCE=0V VLX=5V -0.1 A 3 FB H Current ICEH VIN=VLX VFB=0.4V 0.1 A 3 FB L Current ICEL VCE=0V VLX=5V -0.1 A 3 (*1) Vfbt may take between 0.01V-1.49V certain value, now a major center value 0.01V, 0.2V,0.23V,0.25V Shanghai Natlinear Electronics Co. Ltd
3 TEST CIRCUITS Step-up DC/DC Converter Backlight Driver Figure 2 Figure 3 Figure 4 Figure 5 Caution The value of the resistance named RLED: RLED=VFB/ILED;VFB is the voltage 0f the FB pin; ILED is the current of LED and equal to 20mA usually. TYPICAL APPLICATION CIRCUIT VIN L1 22uH D2 1N5818 VOUT Common CIN 1uF 100HZto 10KHZ VIN CE VSS LN2117 LX OVP FB R2 CL 0.22uF Common Figure 6 Shanghai Natlinear Electronics Co. Ltd
4 Figure 7 Caution The value of the resistance named RLED: R2=VFB/ILED;VFB is the voltage 0f the FB pin; ILED is the current of LED and equal to 20mA usually; TYPICAL PERFORMANCE CHARACTERISTICS Shanghai Natlinear Electronics Co. Ltd
5 PIN CONFIGURATION 6 VIN 5 VOP 4 CE Step-up DC/DC Converter Backlight Driver LX VSS FB SOT-23-6L (TOP VIEW) Remark Please contact the Natlinear marketing department for other packages. PIN ASSIGNMENT ORDERING INFORMATION LN MARKING SOT-23-6 Pin Number Pin Name Function 1 LX SWITCH 2 VSS Ground 3 FB Voltage Feedback 4 CE Chip Enable 5 OVP Over voltage protect 6 VIN Power Input Item Symbol Function 1 B Denotes Lx Overvoltage Limit: Yes Denotes Oscillation Frequency:1MHZ Denotes FB Voltage e.g. 2 =1 3 =2 4 =3 1.23V 5 M Denotes Package Type : SOT R Embossed Tape :Standard Feed L Embossed Tape :Reverse Feed SOT-23-6L (TOP VIEW) Shanghai Natlinear Electronics Co. Ltd
6 1 Represents the product name Symbol Z Part Number LN2117****M* 2 Represents the type of regulator Symbol Vfb(V) Part Number A LN2117B***M* B LN2117B***M* C LN2117B***M* 3 Represents the voltage of FB pin Symbol Vfb(V) Symbol Vfb(V) F H K L M N P R S T A U B V C X D Y E Z Represents the assembly lot no. 0~9,A~Z,Reverts 0~9,A~Z repeated (G,I,J,O,Q,W expected) Shanghai Natlinear Electronics Co. Ltd
7 PACKAGING INFORMATION SOT-23-6L Shanghai Natlinear Electronics Co. Ltd
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