Advanced Power Electronics Corp. APE8875 1.6X LINEAR REGULATOR FOR DC FAN DRIVER FEATURES DESCRIPTIOON The APE8875 is a low dropout linear regulator which is designed to power a DC fan and delivers up to 600mA output current. The output voltage follows the 1.6 times of VSET voltage and typical dropout voltage is only 200mV (typical) at 600mA output current. The VSET voltage can form 0.1V to 3.3V to guarantee VO 1.6 times of VSET. An enable pin further reduces power dissipation while shut-down. The features of current limit (with fold back current) and over temperature protection protect the device against current over-loads and over temperature. The APE8875 is available in a TSOT-26 & SO-8 package. Low Dropout Voltage: [email protected] VO Follows 1.6 Times of VSET Enable/Shutdown Function Stable with Low ESR Ceramic Capacitors Current-Limit and Thermal Shutdown Protection TSOT-26 & SO-8 Pb-Free Package Halogen Free Product TYPICAL APPLICATION U1 VOUT =1.6 X VSET VIN=5V VOUT VIN VSET VSET C2 C1 2.2uF GND EN FAN 2.2uF APE8875 ORDERING / PACKAGE INFORMATION Package Type ( Top View ) (Top View) APE8875X VOUT 1 6 VSET EN 1 8 GND GND 2 5 GND VIN 2 7 GND VIN 3 4 EN VOUT 3 6 GND VSET 4 5 GND TY : TSOT-26 M : SO-8 Data and specifications subject to change without notice TSOT-26 SO-8 1 20130108V2.1 Advanced Power Electronics Corp. APE8875 ABSOLUTE MAXIMUM RATINGS (at TA=25oC) VIN Supply Voltage (VIN) -------------------------- -0.3 to 6.5V EN Voltage (VEN) ------------------------------------ -0.3 to VIN VSET Voltage (VSET) ------------------------------- -0.3 to VIN Power Dissipation (PD) ----------------------------- 0.4W Storage Temperature Range (TST) -------------- -65 to +150°C Junction Temperature Range (TJ) -------------- -40 to +125°C Operating Temperature Range (TOP) ----------- -40 to +85°C Thermal Resistance from Junction to Case(Rth JC) TSOT-26 50°C/W SO-8 25°C/W Thermal Resistance from Junction to Ambient(RthJA) TSOT-26 SO-8 100°C/W 70°C/W Note: RthJA is measured with the PCB copper area approximately 1.5 in2 (Multi-layer) that connect to GND Pins. ELECTRICAL SPECIFICATIONS (VSET = 2V, VIN = 5V, IOUT = 0.5A, CIN=COUT=2.2uF, TA=25oC unless otherwise specified) Parameter SYM TEST CONDITION MIN TYP MAX UNITS 4.5 - 6 V VIN Supply Voltage Range VIN Quiescent Current ICCQ No Load - 50 80 uA Standby Current ISTB VEN=0V - 1 10 uA VO/VSET VIN=5.5V, VSET=1V~3.3V 1.552 1.6 1.648 V/V Line Regulation VIN=4.5V to 5.5V - 0.2 0.5 % Load Regulation IOUT=10mA ~ 0.6A - 30 60 mV IOUT=0.6A, VSET=3.3V - 200 320 mV 700 - - mA - 250 - mA 0.1 - 3.3 V VSET=5V - 80 200 nA VEN-H Operating mode 2 - - VEN-L Shutdown mode - - 0.8 IENH VEN=VIN - 0.003 0.1 μA IENL VIN=5V, VEN=0V - 1 5 μA VOUT Pull Low Resistance RO VEN=0V - 60 - Ω Thermal Shutdown Temp TSD - 150 - °C - 30 - °C Output Voltage/VSET Voltage Dropout Voltage VDrop Current Limit ILimt Short Circuit Current IShort VSET Voltage Range VSET VSET Pin Current ISET EN Pin Logic Threshold Voltage Enable Pin Current Thermal Shutdown Hysteresis Vo<0.6V V 2 Advanced Power Electronics Corp. APE8875 PIN DESCRIPTIONS PIN SYMBOL VIN PIN DESCRIPTION IC power supply pin. EN This pin is pulling High inside. If EN input < 0.8V, the IC is into shutdown mode. This pin sets the output voltage. Its voltage can form 0.1V to 3.3V to guarantee VSET VOUT 1.6 times of VSET GND Ground Pin VOUT Output Pin. Its voltage is 1.6 times of VSET BLOCK DIAGRAM VOUT VIN Current Limit and Short Protection - + Error Amp Thermal Shutdown EN Enable GND VSET FUNCTION DESCRIPTIONS Output Voltage Regulation The Output Voltage is set by VSET voltage. VOUT output voltage follows the 1.6 times of VSET voltage until it reaches VIN voltage. Enable/Shutdown Driving the EN high turns on the regulator, driving the EN low puts the regulator into shutdown mode. A logic low also causes the output voltage to discharge to the GND. The EN is pulled Hight by an internal resistor. 3 Advanced Power Electronics Corp. APE8875 FUNCTION DESCRIPTIONS Current-Limit The APE8875 monitors the current via the output PMOS and limits the maximum current to prevent load and APE8875 from damages during overload or short circuit conditions. Short Current Protection When the output voltage drops below 0.6V (typical), which is caused by over load or short circuit, the fold back current limit circuitry limits the output current to 250mA. The fold back current limit is used to reduce the power dissipation during short circuit condition. Thermal Shutdown A thermal shutdown circuit limits the junction temperature of APE8875. When the junction temperature exceeds +150 °C, a thermal sensor turns off the output PMOS, allowing the device to cool down. The regulator regulates the output again through initiation of a new soft-start cycle after the junction temperature cools by 30 ° C, resulting in a pulsed output during continuous thermal overload conditions. APPLICATION INFORMATION Capacitor Selection Normally, use a 2.2µF capacitor on the input and a 2.2µF capacitor on the output of the APE8875. In order to insure the circuit stability, the proper output capacitor value should be larger than 1uF. With X5R and X7R dielectrics, 2.2uF is sufficient at all operating temperatures. Thermal Considerations The APE8875 series can deliver a current of up to 600mA over the full operating junction temperature range. However, the maximum output current must be dated at higher ambient temperature to ensure the junction temperature does not exceed 125° C. With all possible conditions, the junction temperature must be within the range specified under operating conditions. Power dissipation can be calculated based on the output current and the voltage drop across regulator. PD = (VIN - VOUT) IO The final operating junction temperature for any set of conditions can be estimated by the following thermal equation: PD (MAX) = (TJ (MAX) - TA) / RthJA Where TJ(MAX) is the maximum junction temperature of the die (125°C) and TA is the maximum ambient temperature. The junction to ambient thermal resistance (RthJA) for TSOT-26 package at recommended minimum footprint is 100°C/W. 4 Advanced Power Electronics Corp. APE8875 FUNCTION DESCRIPTIONS PCB Layout 1. Please place the input capacitors close to the VIN 2. Ceramic capacitors for load must be placed near the load as close as possible 3. To place APE8875 and output capacitors near the load is good for performance. 4. Large current paths that VIN and Output lines must have wide tracks. 5. GND connect large copper area can reduced IC temperature. PCB Layout Guide (Top View) (Bottom View) 5 Advanced Power Electronics Corp. APE8875 TYPICAL PERFORMANCE CHARACTERISTICS 6 Advanced Power Electronics Corp. APE8875 TYPICAL PERFORMANCE CHARACTERISTICS Line Transient Line Transient EN ON/OFF 7 Advanced Power Electronics Corp. APE8875 TYPICAL PERFORMANCE CHARACTERISTICS Power ON 8 Advanced Power Electronics Corp. APE8875 MARKING INFORMATION TSOT-26 HCYWS Part Number : HC Week: A~Z : 01~26 a~z : 27~52 ID Code : Internal Year : A = 2010 1 = 2011 ： ： SO-8 Part Number Package Code 8875M YWWSSS Date Code (YWWSSS) Y：Last Digit Of The Year WW：Week SSS：Sequence 9