Advanced Power Electronics Corp. APE8837 DUAL CHANNEL LDO REGULATORS WITH ENABLE FEATURES DESCRIPTION The APE8837 is a high accurately, low noise, high ripple rejection ratio, low dropout, dual CMOS LDO voltage regulators with enable function. The EN function allows the output of each regulator to be turned off independently, resulting in greatly reduced power consumption. The APE8837 has the soft start function to suppress the inrush current. The current limit is over 250mA per channel and also operates as a short protection for the output current limiter. The output voltage for each regulator is set independently by metal trimming. The APE8837 is fully compatible with low ESR ceramic capacitors, reducing cost and improving output stability. This high level output stability is maintained even during frequent load fluctuations, due to the excellent transient response performance and high PSRR achieved across a broad range of frequency. It is available in the SOT-26 and DFN 2x2 packages. Input Voltage Range : 2.5V to 6V Varied Fixed Output Voltage Combinations 150mV Dropout at 100mA Output Current (Vout≧2.8V) Output Current: 200mA/channel (typ.) Low Quiescent Current Standby Current: 2uA (typ.) Current Limit and Short Current Protections Thermal Shutdown Protection Fast Transient Response Low ESR Capacitor Compatible (X7R, X5R) Available in the 6-Pin Pb-Free SOT-26 and DFN 2x2 Packages TYPICAL APPLICATION VIN C IN 1uF VOUT2 EN2 VIN VOUT2 VOUT1 GND COUT2 APE8837A 1uF V OUT1 EN1 COUT1 1uF ORDERING INFORMATION Output Type Code : (VOUT1+VOUT2) A : 1.5V+2.8V APE8837 X X - HF Halogen Free Output Type (Refer Table) Package Y : SOT-26 GN2 : DFN 2x2 H : 2.8+3.0V R : 3.3V+1.8V B : 1.8V+2.8V J : 2.8+3.3V T : 1.5V+3.3V C : 1.8V+2.6V K : 3.0+3.0V V : 1.5V+3.0V D : 1.8V+3.3V L : 3.0V+3.3V W : 1.2V+2.8V E : 2.5V+2.8V M : 3.3+3.3V X : 1.2V+1.2V F : 2.8V+1.2V P : 1.8V+3.0V Y : 2.8V+1.5V G : 2.8V+1.8V Q : 1.5V+2.5V Table1. Data and specifications subject to change without notice 1 201003171 Advanced Power Electronics Corp. APE8837 ABSOLUTE MAXIMUM RATINGS (at TA=25°C) Input Voltage (VIN) ----------------------------------------- GND - 0.3 to + 6V Output Current (IO1+IO2) ----------------------------------- 500mA Output Voltage (VOUT1/VOUT2) ----------------------- GND - 0.3 to VIN + 0.3 Enable Voltage (VEN1/VEN2) --------------------------- GND - 0.3 to VIN + 0.3 Power Dissipation (PD) ------------------------------------- 250mW Storage Temperature Range (TST) --------------------- -40 to 150°C Operating Temperature Range (T OP) ------------------ -40 to 85°C Junction Temperature Range (T J) ---------------------- -40 to 125°C Thermal Resistance from Junction to case (Rth jc) 180oC/W Thermal Resistance from Junction to ambient (Rthja) 250oC/W Note. Rthja is measured with the PCB copper area of approximately 1 in 2(Multi-layer). That need connect to GND pin. PACKAGE INFORMATION VOUT1 GND VOUT2 6 (Top View) EN1 1 VIN 2 EN2 3 5 6 VOUT1 APE8837 4 GND 5 GND 1 4 VOUT2 2 3 EN1 VIN EN2 DFN 2x2 (6L) SOT-26 (TOP VIEW) APE8837 ELECTRICAL SPECIFICATIONS (TA=25℃, unless otherwise noted.) Parameter Input Voltage Output Voltage Accuracy Quiescent Current Dropout Voltage SYM VIN ∆VOUT ICC VDROP TEST CONDITION TYP MAX Note1. 2.5 - 5.5 V IOUT =1mA, VIN=5V,VOUT >2.0V -2 - 2 % IOUT =1mA, VIN=5V,VOUT ≦2.0V -0.04 - 0.04 V uA IOUT1,2=0mA, VIN=5V - 60 100 IOUT=0.2A, VO=VO-2%, VOUT=1.5V - 1000 1200 IOUT=0.2A, VO=VO-2%, VOUT=1.8V - 700 900 Short Circuit Current ILIMIT ISC mV - 300 400 250 - - VOUT<1.0V, each channel - 150 - mA IOUT =1mA, VIN=VOUT+1V to 6.0V - 0.2 0.3 %/V IOUT=0.2A, VO=VO-2%, VOUT>2.5V Current Limit (Note2) UNITS MIN VIN=VOUT (T) + 1.0V, VEN=VIN mA Line Regulation ∆VLINE Load Regulation (Note 3) ∆VLOAD IOUT =1~100mA, VIN=VOUT+1V - 0.01 0.03 %/mA Ripple Rejection PSRR F=120Hz, IOUT= 30mA - 60 - dB PPM/ºC - +100 - VENH 2 - - VENL - - 0.8 - 1 2 uA - IOUT=30mA (Note 4) Output Voltage Temperature Coefficient Enable Input Threshold Enable Pull-high Current Shutdown Current IEN VEN1,2 = 0V ISD IOUT1,2 =0mA, VIN=5V, VEN1,2=0V V 2 4 uA Thermal Shutdown Temperature TST - 150 - ºC Thermal Shutdown Hysterisis TSH - 40 - ºC 2 Advanced Power Electronics Corp. APE8837 Note 1. VIN (min) =VOUT+VDROP Note 2. Current limit is measured at constant junction temperature by using pulsed testing with a low ON time. Note 3. Regulation is measured at constant junction temperature by using pulsed testing with a low ON time. Note 4. Guaranteed by design. PIN DESCRIPTIONS PIN SYMBOL VIN PIN DESCRIPTION Input Voltage GND Common Ground Pin EN1 VOUT1 Enable Control Pin EN2 VOUT2 Enable Control Pin VOUT1 Output1 Voltage VOUT2 Output2 Voltage BLOCK DIAGRAM VIN Bandgap + VOUT2 Thermal Shutdown Error Amp Enable2 Enable1 Current Limit1 - + - Current Limit2 Error Amp VOUT1 GND EN2 EN1 FUNCTION DESCRIPTION The APE8837 is a highly accurate, dual, low noise, CMOS LDO voltage regulators with enable function. The output voltage for each regulator is set independently by fuse trimming. As illustrated in function block diagram, it consists of a reference, error amplifier, a P-channel pass transistor, an ON/OFF control logic and an internal feedback voltage divider. The band gap reference is connected to the error amplifier, which compares the reference with the feedback voltage and amplifies the voltage difference. If the feedback voltage is lower than the reference voltage, the pass- transistor gate is pulled lower, which allows more current to pass to the VOUT pin and increases the output voltage. If the feedback voltage is too high, the pass transistor gate is pulled up to decrease the output voltage. The output voltage is feed back through an internal resistive divider connected to VOUT pin. Additional blocks include an output current limiter, thermal sensor, and shutdown logic. 3 Advanced Power Electronics Corp. APE8837 Enable Function EN1 and EN2 pin start and stop the corresponding outputs independently. When the EN pin is switched to the power off level, the operation of all internal circuit stops, the build-in P-channel MOSFET output transistor between pins VIN and VOUT is switched off, allowing current consumption to be drastically reduced. Dropout Voltage A regulator’s minimum input-output voltage differential, or dropout voltage, determines the lowest usable supply voltage. The APE8837 use a P- channel MOSFET pass transistor, its dropout voltage is function of drain-to-source onresistance RDS (ON) multiplied by the load current. VDROPOUT = VIN-VOUT = RDS(ON) x IOUT Current Limit Each channel of APE8837 includes a fold back current limiter. It monitors and controls the pass transistor’s gate voltage, estimates the output current, and limits the output current within 250mA. Thermal Shutdown Protection Thermal Shutdown protection limits total power dissipation of APE8837. When the junction temperature exceeds TJ = +150°C, a thermal sensor turns off the pass transistor, allowing the IC to cool down. The thermal sensor turns the pass transistor on again after the junction temperature cools down by 40°C, resulting in a pulsed output during continuous thermal shutdown conditions. Thermal shutdown protection is designed to protect the APE8837 in the event of fault conditions. For continuous operation, the absolute maximum operating junction temperature rating of TJ = +125°C should not be exceeded. APPLICATION INFORMATION Like any low-dropout regulator, the APE8837 requires input and output decoupling capacitors. The device is specifically designed for portable applications requiring minimum board space and smallest components. These capacitors must be correctly selected for good performance (see Capacitor Characteristics Section). Please note that linear regulators with a low dropout voltage have high internal loop gains which require care in guarding against oscillation caused by insufficient decoupling capacitance. Input Capacitor An input capacitance of 1µF is required between input pin and ground directly (the amount of the capacitance may be increased without limit). The input capacitor must be located less than 1cm from the device to assure input stability. A lower ESR capacitor allows the use of less capacitance, while higher ESR type (like aluminum electrolytic) requires more capacitance. Capacitor types (aluminum, ceramic and tantalum) can be mixed in parallel, but the total equivalent input capacitance/ ESR must be defined as above to stable operation. There are no requirements for the ESR on the input capacitor, but tolerance and temperature coefficient must be considered when selecting the capacitor to ensure the capacitance will be 1µF over the entire operating temperature range. 4 Advanced Power Electronics Corp. APE8837 Output Capacitor The APE8837 is designed specifically to work with very small ceramic output capacitors. A ceramic capacitor (temperature characteristics X7R, X5R) in 1μF is suitable for the APE8837 application. The recommended minimum capacitance for the device is 1μF, X5R or X7R dielectric ceramic, between VOUT and GND for stability, but it may be increased without limit. Higher capacitance values help to improve transient. The output capacitor's ESR is critical because it forms a zero to provide phase lead which is required for loop stability. Thermal Considerations The APE8837 series can deliver a current of up to 200mA/channel over the full operating junction temperature range. However, the maximum output current must be debated 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) IOUT + VIN x IGND The final operating junction temperature for any set of conditions can be estimated by the following thermal equation: PD (MAX) = (TJ (MAX) - TA) / θJA 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 (θJA) SOT-26 package at recommended minimum footprint is 250°C/W. 5 ADVANCED POWER ELECTRONICS CORP. Package Outline : SOT-26 G L L Millimeters C A SYMBOLS MIN NOM MAX A 2.70 2.90 3.10 B 2.60 2.80 3.00 C 1.40 1.60 1.80 D 0.30 0.43 0.55 E 0.00 0.05 0.10 B D H 1.20REF G 1.90REF I 0.12REF J 0.37REF L 0.95REF H E I 1.All Dimension Are In Millimeters. J 2.Dimension Does Not Include Mold Protrusions. Part Marking Information & Packing : SOT-26 RP&YY Part Number : RP Vout Code (see the table1.) Date Code YY:2004,2008,2012… YY:2003,2007,2011… YY:2002,2006,2010… YY:2001,2005,2009… ADVANCED POWER ELECTRONICS CORP. Package Outline : DFN 2x2-6L C D A 1 e E Millimeters SYMBOLS E2 b MIN NOM MAX 0.80 0.85 1.00 A1 0.00 － 0.05 b 0.20 0.25 0.30 C 0.195 0.203 0.211 D 1.95 2.00 2.05 D2 0.55 0.60 0.65 E 1.95 2.00 2.05 E2 1.15 1.20 1.25 e D L L A1 0.65 (ref) 0.3 0.35 0.4 A 1.All Dimension Are In Millimeters. 2.Dimension Does Not Include Mold Protrusions. Part Marking Information & Packing : DFN 2x2-6L Part Number : RP Vout Code (see the table1.) RP& YWS Date Code (YWS) Y:Year W：Week S：Sequence Draw No. I1-N3S6-G-v00