AX1509

Page No. : 1/8 AX1509 150KHz, 2A PWM Buck DC/DC Converter Description The AX1509 is Monolithic IC that design for a step-down DC/DC Converter, and own the ability of driving a 2A load without additional transistor component. The output version included 3.3V, 5V, 12V and an adjustable type. It operates at a switching frequency of 150KHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Other features include a guaranteed ±4% tolerance on output voltage under specified input voltage and output load conditions, and ±15% on the oscillator frequency. Regarding protected function, thermal shutdown is to prevent over temperature operating from damage, and current limit is against over current operating of the output switch. 8-Lead Plastic DIP-8 Package Code: P • 8-Lead Plastic SOP-8 Package Code: S Features • 3.3V, 5V, 12V and adjustable • Adjustable version output voltage range: 1.25-18V • ±4% max over line and load conditions • 150KHz ±15% fixed switching frequency • TTL shutdown capability • Operating voltage can be up to 22V • Output load current: 2A • SOP-8 and DIP-8 packages • Low power standby mode • Thermal-shuntdown and current-limit protection • High efficiency • Built-in switching a transistor on chip, requires only 4 external components Applications • Simple High-efficiency step-down regulator • Positive to negative converter • On-card switching regulators Pin Connections 8 7 6 5 Pin1: Operating Voltage Input Pin2: Switch Output Pin3: Output Voltage Feedback Control Pin5: Ground Pin6: Ground Pin7: Ground Pin8: Ground 1 2 3 4 Pin4: ON/OFF Shutdown DS-AX1509-01 Aug, 2006 www.Orister.com Page No. : 2/8 Pin Connections SD VIN Current Source Bias + + 220mV R 1.235V 1 25V Reference 2.5V Regulator Start Up 200mV + COMP Current Limit FB R2 + AMP + COMP COMP + 150KHz OSC. COMP + 3A Switch Driver Thermal Limit R1=2.5K Output GND Absolute Maxium Rating (Note1) Parameter Supply Voltage On/Off Pin Input Voltage Feedback Pin Voltage Output Voltage to Ground Power Dissipation Operating Temperature Storage Temperature Operating Voltage Symbol VCC VSD VFB VOUT PD Topr Tstg VOP Value +24 -0.3~+18 -0.3~+18 -1 Internally Limited -40~+125 -65~+150 +4.5~+22 Unit V V V V W o o C C V Electrical Characteristics (Continued) Specifications with boldface type apply over for full operating temperature range, the other type are for TJ=25 C o (Note 2) Part No. Parameter Output Voltage Efficiency Symbol VOUT η VOUT η VOUT η VOUT η Conditions 4.75V≤VIN≤22V, 0.2A≤ILOAD≤2A VIN=12V, ILOAD=2A 7V≤VIN≤22V, 0.2A≤ILOAD≤2A VIN=12V, ILOAD=2A 15V≤VIN≤22V, 0.2A≤ILOAD≤2A VIN=25V, ILOAD=2A 4.5V≤VIN≤22V, 0.2A≤ILOAD≤2A VOUT programmed for 3V VIN=12V, VOUT=3V, ILOAD=2A Min. 3.168 3.135 4.800 4.750 11.52 11.40 1.213 1.200 - Typ. Max. (Note3) (Note4) 3.3 73 5.0 80 12.0 90 1.25 73 3.342 3.465 5.200 5.250 12.48 12.60 1.287 1.300 - Unit V % V % V % V % AX1509-3.3 AX1509-5.0 Output Voltage Efficiency AX1509-12 Output Voltage Efficiency AX1509-ADJ Output Voltage Efficiency DS-AX1509-01 Aug, 2006 www.Orister.com Page No. : 3/8 All Output Voltage Versions Electrical Characteristics Specifications with boldface type apply over for full operating temperature range, the other type are for TJ=25 C (Unless otherwise specified, VIN=12V for the 3.3V, 5V, and adjustable version and VIN=18V for the 12V version, ILOAD=500mA) o Parameter Device Parameters Feedback Bias Current Oscillator Frequency Saturation Voltage Max. Duty Cycle (ON) Min. Duty Cycle (OFF) Current Limit Output Leakage Current Quiescent Current Standby Quiescent Current Symbol Test Condition Min. Typ. Max. -50 -100 173 173 1.4 1.5 6.5 7.5 -50 10 250 300 0.6 -15 -5 Unit Ib fO VSAT DC ICL IL IQ ISTBY θJC Adjustable Version Only, VFB=1.3V (Note 5) 120 110 3.6 2.0 - -10 150 1.3 100 0 4.5 5 150 14 15 80 70 nA KHz V % A uA mA uA o IOUT=2A (Note 6,7) (Note 7) (Note 8) Peak Current (Note 6,7) Output=0V (Note 8) (Note 6,8) ON/OFF pin=5V (Note 9) DIP-8 SOP-8 DIP-8 SOP-8 Junction to Case Junction to ambient C/W C/W Thermal Resistance θJA ON/OFF Control ON/OFF Pin Logic Input Threshold Voltage ON/OFF Pin Input Current VIH VIL IIH IIL (Note 10) o Low (Regulator ON) High (Regulator OFF) VLOGIC=2.5V (Regulator OFF) VLOGIC=0.5V (Regulator ON) 1.3 -5 -0.02 V uA Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. Note 2: External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator system performance. Note 3: Typical numbers are at 25 C and represent the most likely norm. Note 4: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL). Note 5: The switching frequency is reduced when the second stage current limit is activated. Note 6: No diode, inductor or capacitor connected to output pin. Note 7: Feedback pin removed from output and connected to 0V to force the output transistor switch ON. Note 8: Feedback pin removed from output and connected to 12V for the 3.3V, 5V, ADJ. version, and 15V for the 12V version, to force the output transistor switch OFF. Note 9: VIN=22V. Note 10: Junction to ambient thermal resistance. (With copper area of approximately 3in ) 2 o DS-AX1509-01 Aug, 2006 www.Orister.com Page No. : 4/8 Characteristics Curve Normalized Output Voltage 1.5 VIN=12V ILOAD=200mA 160 140 120 Shutdown Quiescent Current 1 Output Voltage Change (%). . Current (uA) 0.5 100 80 60 40 VON/VOFF=5V TJ=25 C o 0 -0.5 -1 20 -1.5 0 25 50 75 100 o 125 150 175 0 0 10 20 30 Supply Voltage (V) 40 Junction Temperature ( C) Switch Current Limit 6.00 5.90 1.30 VIN=12V TJ=25oC 1.20 Switch Saturation Voltage Switch Current Limit (A) 5.70 5.60 5.50 5.40 5.30 5.20 0 25 50 75 100 o Saturation Voltage (V) 5.80 1.10 VIN=12V VOUT =5V 1.00 0.90 0.80 125 150 0 1 2 3 4 Junction Temperature ( C) Switch Current (A) On/Off Pin Current (Sinking) 12 10 Vin=22V 8 Current (uA) 6 4 2 0 0 5 10 15 20 25 30 Tj=25℃ On/Off Pin Voltage (V) DS-AX1509-01 Aug, 2006 www.Orister.com Page No. : 5/8 Typical Application Circuit Fig.1 Fixed Type Circuit 3 FB + 1 Vin DC C1 680uF 4 AX1509 Fix Output 5 6 7 8 2 Output L1 33uH D1 1N5825 C2 220uF L O A D SD Gnd Gnd Gnd Gnd Fig.2 Adjustable Output Voltage Versions R2 1K + 1 Vin DC C1 680uF 3 FB R1 AX1509 Adjustable Output 4 5 6 7 8 2 Output L1 47uH D1 1N5825 C2 220uF L O A D SD Gnd Gnd Gnd Gnd DS-AX1509-01 Aug, 2006 www.Orister.com Page No. : 6/8 DIP-8 Dimension DIM A B C D E F G H I J K L M α1 Min. 6.29 9.22 3.25 3.17 0.38 2.28 7.49 8.56 0.229 o 94 Max. 6.40 9.32 *1.52 *1.27 *0.99 3.35 3.55 0.53 2.79 7.74 *3.00 8.81 0.381 o 97 8 7 6 5 Marking: A 1 2 3 4 B F J Note: Green label is used for pb-free packing Pin Style: 1.Vin 2.Output 3.FB 4.SD 5.Gnd 6.Gnd 7.Gnd 8.Gnd C E D G H α1 K M L Material: • Lead solder plating: Sn60/Pb40 (Normal), Sn/3.0Ag/0.5Cu or Pure-Tin (Pb-free) • Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0 *: Typical, Unit: mm I 8-Lead DIP-8 Plastic Package Package Code: P SOP-8 Dimension A G Marking: 8 B 7 6 5 C 4 J H I Pin1 Index 2 3 Note: Green label is used for pb-free packing Pin Style: 1.Vin 2.Output 3.FB 4.SD 5.Gnd 6.Gnd 7.Gnd 8.Gnd D E Part A K L N O Part A M Material: • Lead solder plating: Sn60/Pb40 (Normal), Sn/3.0Ag/0.5Cu or Pure-Tin (Pb-free) • Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0 DIM A B C D E F G H I J K L M N O Min. 4.85 3.85 5.80 1.22 0.37 3.74 1.45 4.80 0.05 0.30 0.19 0.37 0.23 0.08 0.00 Max. 5.10 3.95 6.20 1.32 0.47 3.88 1.65 5.10 0.20 0.70 0.25 0.52 0.28 0.13 0.15 *: Typical, Unit: mm F 8-Lead SO-8 Plastic Surface Mounted Package Package Code: S Ordering Information Part Number AX1509S-ADJ AX1509S -3.3 AX1509S -5.0 AX1509S -12 Package SOP-8 SOP-8 SOP-8 SOP-8 Part Number AX1509P-ADJ AX1509P -3.3 AX1509P -5.0 AX1509P -12 Package DIP-8 DIP-8 DIP-8 DIP-8 DS-AX1509-01 Aug, 2006 www.Orister.com Page No. : 7/8 Soldering Methods for Orister’s Products 1. Storage environment: Temperature=10oC~35oC Humidity=65%±15% 2. Reflow soldering of surface-mount devices Figure 1: Temperature profile tP TP Ramp-up TL Tsmax Temperature tL Critical Zone TL to TP Tsmin tS Preheat Ramp-down 25 t 25oC to Peak Time Profile Feature Sn-Pb Eutectic Assembly Pb-Free Assembly Average ramp-up rate (TL to TP) Preheat - Temperature Min (Tsmin) - Temperature Max (Tsmax) - Time (min to max) (ts) Tsmax to TL - Ramp-up Rate Time maintained above: - Temperature (TL) - Time (tL) Peak Temperature (TP) Time within 5oC of actual Peak Temperature (tP) Ramp-down Rate Time 25oC to Peak Temperature 3. Flow (wave) soldering (solder dipping) Products