AME Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Converter AME5252 n General Description n Features l High Efficiency: Up to 96% The AME5252 is a dual, constant frequency, synchronous step down DC/DC converter. Intended for low power applications, it operates from 2.5V to 5.5V input voltage range and has a constant 1.5MHz switching frequency, allowing the use of tiny, low cost capacitors and inductors 2mm or less in height. Each output voltage is adjustable from 0.6V to 5V. Internal synchronous 0.35Ω, 1A power switches provide high efficiency without the need for external Schottky diodes. l Internal soft start l 1.5MHz Constant Frequency Operation l High Switch Current: 1A on Each Channel l No Schottky Diodes Required l Low RDSON Internal Switches: 0.35Ω l Current Mode Operation for Excellent Line To further maximize battery life, the P-channel MOSFETs are turned on continuously in dropout (100% duty cycle). In shutdown model, the device draws <1µA. and Load Transient Response l Short-Circuit Protected l Low Dropout Operation: 100% Duty Cycle n Applications l Ultralow Shutdown Current: IQ<1µA l Output Voltages from 5V down to 0.6V l PDAs/Palmtop PCs l Power-On Reset Output l Digital Cameras l Externally Synchronizable Oscillator l Cellular Phones l All AME’ s Lead Free Products Meet RoHS l Portable Media Players Standards l PC Cards l Wireless and DSL Modems n Typical Application C V IN 2.8V~5.5V C IN 10µF EN2 IN SYNC V OUT2 = 2.5V CF2 22pF COUT 2 10µF L2 2.2µ H EN1 RESET PORB AME5252 L1 2.2µ H SW1 SW2 VOUT 1 = 1.8V S R2 887KΩ R4 887KΩ VFB2 R3 280KΩ R5 100KΩ GND/PGND VFB1 R1 442KΩ CF1 22pF COUT 1 10µF Figure 1. 2.5V/1.8V at 600mA Step-Down Regulators Rev.C.01 1 AME Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Converter AME5252 n Typical Application VIN 2.5V~5.5V CIN 10 µF EN2 IN SYNC V OUT2 = 1.8V L2 2.2µH EN1 AME5252 L1 2.2µ H VOUT 1 = 1.2V SW1 SW2 R2 604KΩ VFB2 COUT 2 10µF RESET PORB R4 887KΩ CF2 22pF R5 100KΩ R3 442KΩ CF1 22pF VFB1 COUT1 10µ F R1 604KΩ GND/PGND Figure 2. 1.8V/1.2V at 600mA Step-Down Regulators VIN 2.8V~5.5V C IN 10µF EN2 IN SYNC VOUT2 = 2.5V CF2 22pF L2 2.2µH RESET L1 2.2µH SW1 SW2 R2 475KΩ R4 1MΩ R3 316KΩ R5 100KΩ PORB AME 5252 VFB2 COUT 2 10µF EN1 GND/PGND V OUT 1 = 1.5V CF1 22pF VFB1 R1 316KΩ COUT 1 10µ F Figure 3. 2.5V/1.5V at 600mA Step-Down Regulators 2 Rev. C.01 AME Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Converter AME5252 n Typical Application VIN 2.8V~5.5V CIN 10µF IN EN2 SYNC D1 VOUT2 = 3.3V CF2 22pF COUT2 10µF L2 2.2µ H EN1 PORB RESET L1 2.2µH AME5252 SW2 R5 100KΩ SW1 R4 M1 887KΩ R2 887KΩ VFB2 VFB1 GND/PGND R3 196KΩ R1 442KΩ VOUT 1 = 1.8V CF1 22pF COUT 1 10µ F Figure 4. 3.3V/1.8V at 600mA Step-Down Regulators C Rev.C.01 3 AME Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Converter AME5252 n Function Diagram SYNC 6 CLAMP VIN 0.6V Slope COMP IN ∑ + + VFB1 1 3 - 0.55V SWITCHING LOGIC AND BLANKING CIRCUIT UVDET + P_ch ANTI SHOOT-THRU + 4 SW1 N_ch OVDET 0.65V + - IRCMP EN1 EN2 2 9 VFB2 10 4 11 PGND 8 PORB 0.6V VREF OSC PORB COUNTER 5 GND REGULATOR 2 7 SW2 Rev. C.01 AME Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Converter AME5252 n Pin Configuration DFN-10B (3mmx3mmx0.75mm) Top View 10 9 8 7 6 AME5252 AME5252-AVBxxx 1. VFB1 7. SW2 2. EN1 8. PORB 3. IN 9. EN2 4. SW1 10. VFB2 5. GND 11. *PGND 6. SYNC 1 2 3 4 5 Die Attach: Conductive Epoxy Note: * The area enclosed by dashed line represents Exposed Pad (Pin11) and must be connected to GND. n Pin Description Pin Number Pin Name 1 VFB1 2 EN1 3 IN 4 SW1 5 GND 6 SYNC The oscillation frequency can be syncronized to an external oscillator applied to this pin and pulse skipping mode is automatically selected. Do not float this pin. 7 SW2 Regulator 2 Switch Node Connection to the Inductor. This pin swings from VIN to GND. 8 PORB Power-on Reset. This common-drain logic output is pulled to GND when the output voltage is not within 8.5% of regulation and goes high after 175ms when both channels are within regulation. 9 EN2 Requlator 2 Enable. Output Feedback. Forcing this pin to VIN enables regulator 2, while forcing it to GND causes regulator 2 to shut down. 10 VFB2 Regulator 2 Output Feedback Reveives the feedback voltage from the external resistive divider across the output Nominal voltage for this pin is 0.6V. 11 PGND Must be Connected to GND. Rev.C.01 Pin Description Regulator 1 Output Feedback. Receives the feedback voltage from the external resistive divider across the output. Nominal voltage for this pin is 0.6V. Regulator 1 Enable. Forcing this pin to VIN enables regulator 1, while forcing it to GND caused regulator 1 to shutdown. C Main Power Supply. Must be closely decoupled to GND. Regulator 1 Switch Node Connection to the Inductor. This pin swings from VIN to GND. Main Ground. Connect to the (-) terminal of COUT, and (-) terminal of CIN . 5 AME Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Converter AME5252 n Ordering Information AME5252 - x x x xxx Output Voltage Number of Pins Package Type Pin Configuration & Special Feature Pin Configuration & Special Feature A (DFN-10B) 6 1. VFB1 2. EN1 3. IN 4. SW1 5. GND 6. SYNC 7. SW2 8. PORB 9. EN2 10.VFB2 11.PGND Package Type V: DFN Number of Pins B: 10 Output Voltage ADJ: Adjustable Rev. C.01 AME Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Converter AME5252 nAvailable Options Part Number Marking Output Voltage Package Operating Ambient Temperature Range AME5252-AVBADJ A5252 BMyMXX ADJ DFN-10B -40OC to +85OC Note: 1. The first 2 places represent product code. It is assigned by AME such as BM. 2. y is year code and is the last number of a year. Such as the year code of 2008 is 8. 3. A bar on top of first letter represents Green Part such as A5252. 4. The last 3 places MXX represent Marking Code. It contains M as date code in "month", XX as LN code and that is for AME internal use only. Please refer to date code rule section for detail information. 5. Please consult AME sales office or authorized Rep./Distributor for the availability of output voltage and package type. n Absolute Maximum Ratings Parameter Symbol Maximum IN -0.3V to 6V VEN , VFB -0.3V to VIN +0.3 Input Supply Voltage VFB1, VFB2, EN1,EN2 Voltage SYNC ,SW1, SW2 Voltage VSW C Unit V -0.3V to VIN +0.3 B* ESD Classification Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device. * HBM B: 2000V ~ 3999V n Recommended Operating Conditions Parameter Symbol Rating Ambient Temperature Range TA -40 to +85 o Junction Temperature Range TJ -40 to +125 o Storage Temperature Range TSTG -65 to +150 o Rev.C.01 Unit C C C 7 AME Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Converter AME5252 n Thermal Information Parameter Package Die Attach Thermal Resistance* (Junction to Case) Thermal Resistance (Junction to Ambient) Symbol Maximum θJC 17 Unit o DFN-10B Conductive Epoxy Internal Power Dissipation Solder Iron (10 Sec)** θJA 125 PD 800 350 C/W mW o C * Measure θJC on backside center of Exposed Pad. ** MIL-STD-202G 210F 8 Rev. C.01 AME Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Converter AME5252 n Electrical Specifications VIN=3.6V, EN =VIN, TA= 25oC, CIN=10µF, ILOAD =0A, unless otherwise noted. Parameter Input Voltage VIN FB Pin Input Current IFB Feedback Trip Point VFB Reference voltage line regulation Output voltage Load regulation Test Condition Symbol Min Typ 2.5 Max Units 5.5 V 30 nA 0.588 0.6 0.612 V 0.585 0.6 0.615 V REGLINE,FB 0.3 0.5 %/V REG LOAD 0.05 o o -40 C≦ TA≦ +85 C % Quiescent Current IQ V FB1=VFB2=0.5V (Switching) 600 800 µA Shutdown Current ISHDN EN=0V 0.1 1 µA Switching Frequency fOSC 1.5 1.8 MHz 0.35 0.55 Ω Top Switch On-Resistance Bottom switch On-Resistance 1.2 RDSON Switch Current Limit IC L V IN=3V, VOUT=1.2V Switch Leakage Current ISW V IN =3.6V, VEN =0V, VSW =0V or 3.6V 0.1 VFBX Ramping UP, SYNC=0V 8.5 % V FBX Ramping Down, SYNC=0V -8.5 % Power-on Reset Threshold PORB 0.95 1.2 Power-on Reset on-resistance 100 Power-on Reset delay 175 A 1 200 µA Ω ms C EN Input Threshold (High) (Enable the device) 1.5 V EN Threshold EN Input Threshold (Low) (Shutdown) 0.3 V Thermal Shutdown Temperature OTP Shutdown, temperature increasing 160 Thermal Shutdown Hysteresis OTH Restore, temperature decreasing 20 Rev.C.01 o C 9 AME AME5252 Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Converter n Detailed Description The AME5252 uses a constant frequency, current mode architecture. The operating frequency is set at 1.5MHz and can be synchronized to an external oscillator. Both channels share the same clock and run in-phase. The output voltage is set by an external divider returned to the VFB pins. An error amplifier compares the divided output voltage with a reference voltage of 0.6V and adjusts the peak inductor current accordingly. Overvoltage and undervoltage comparators will pull the PORB output low if the output voltage is not within 8.5%. The PORB output will go high after 262,144 clock cycles (about 175ms) of achieving regulation. Dropout Operation When the input supply voltage decreases toward the output voltage, the duty cycle increases to 100% which is the dropout condition. In dropout, the P-channel MOSFET switch is turned on continuously with the output voltage being equal to the input voltage minus the voltage drops across the internal P-channel MOSFET and the inductor. An important design consideration is that the RDSON of the P-channel switch increases with decreasing input supply voltage (See Typical Performance Characteristics). Therefore, the user should calculate the power dissipation when the AME5252 is used at 100% duty cycle with low input voltage. Main Control Loop During normal operation, the top power switch (P-channel MOSFET) is turned on at the beginning of a clock cycle when the VFB voltage is below the reference voltage. The current into the inductor and the load increases until the current limit is reached. The switch turns off and energy stored in the inductor flows through the bottom switch (N-channel MOSFET) into the load until the next clock cycle. The peak inductor current is controlled by the internally compensated COMP voltage, which is the output of the error amplifier. This amplifier compares the VFB pin to the 0.6V reference. When the load current increases, the V FB voltage decreases slightly below the reference. This decrease causes the error amplifier to increase the COMP voltage until the average inductor current matches the new load current. The main control loop is shut down by pulling the EN pin to ground. Short-Circuit Protection When the output is shorted to ground, the frequency of the oscillator is reduced to about 210kHz, 1/7 the nominal frequency. This frequency foldback ensures that the inductor current has more time to decay, thereby preventing runaway. The oscillator's frequency will progressively increase to 1.5MHz when VFB or VOUT rises above 0V. 10 n Application Information Inductor Selection For most applications, the value of the inductor will fall in the range of 1µH to 4.7µH. Its value is chosen based on the desired ripple current. Large value inductors lower ripple current and small value inductors result in higher ripple currents. Higher VIN or VOUT also increases the ripple current as shown in equation 1. A reasonable starting point for setting ripple current is IL = 240mA (40% of 600mA). ∆ IL= VOUT 1 ⋅ VOUT (1 − ) f ⋅L VIN The DC current rating of the inductor should be at least equal to the maximum load current plus half the ripple current to prevent core saturation. Thus, a 720mA rated inductor should be enough for most applications (600mA+ c 120mA). For better efficiency, choose a low DC-resistance inductor. Rev. C.01 AME Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Converter AME5252 Inductor Core Selection Once the value for L is known, the type of inductor must be selected. High efficiency converters generally cannot afford the core loss found in low cost powdered iron cores, forcing the use of more expensive ferrite or mollypermalloy cores. Actual core loss is independent of core size for a fixed inductor value but it is very dependent on the inductance selected. As the inductance increases, core losses decrease. Unfortunately, increased inductance requires more turns of wire and therefore copper losses will increase. Ferrite designs have very low core losses and are preferred at high switching frequencies, so design goals can concentrate on copper loss and preventing saturation. Ferrite core material saturates "hard", which means that inductance collapses abruptly when the peak design current is exceeded. This result in an abrupt increase in inductor ripple current and consequent output voltage ripple. Do not allow the core to saturate! Different core materials and shapes will change the size/current and price/current relationship of an inductor. Toroid or shielded pot cores in ferrite or permalloy materials are small and don't radiate energy but generally cost more than powdered iron core inductors with similar characteristics. The choice of which style inductor to use mainly depends on the price vs. size requirements and any radiated field/EMI requirements. Several capacitors may also be paralleled to meet size or height requirements in the design. The selection of COUT is determined by the effective series resistance (ESR) that is required to minimize voltage ripple and load step transients, as well as the amount of bulk capacitance that is necessary to ensure that the control loop is stable. Loop stability can be checked by viewing the load transient response as described in a later section. The output ripple, VOUT, is determined by : 1 ∆ VOUT ≤ ∆ IL ESR + 8 f ⋅ C OUT The output ripple is highest at maximum input voltage since IL increases with input voltage. Multiple capacitors placed in parallel may be needed to meet the ESR and RMS current handling requirements. Dry tantalum, special polymer, aluminum electrolytic and ceramic capacitors are all available in surface mount packages. Special polymer capacitors offer very low ESR but have lower capacitance density than other types. Tantalum capacitors have the highest capacitance density but it is important to only use types that have been surge tested for use in switching power supplies. Aluminum electrolytic CIN and COUT Selection capacitors have significantly higher ESR but can be used The input capacitance, CIN, is needed to filter the trap- C in cost-sensitive applications provided that consideration ezoidal current at the source of the top MOSFET. To preis given to ripple current ratings and long term reliability. vent large ripple voltage, a low ESR input capacitor sized Ceramic capacitors have excellent low ESR characterisfor the maximum RMS current should be used.RMS curtics but can have a high voltage coefficient and audible rent is given by : piezoelectric effects. The high Q of ceramic capacitors with trace inductance can also lead to significant ringing IRMS = I OUT ( max ) ⋅ VOUT ⋅ VIN VIN VOUT −1 This formula has a maximum at V IN = 2V OUT, where IRMS = IOUT/2. This simple worst-case condition is commonly used for design because even significant deviations do not offer much relief. Note that ripple current ratings from capacitor manufacturers are often based on only 2000 hours of life which makes it advisable to further derate the capacitor, or choose a capacitor rated at a higher temperature than required. Rev.C.01 Using Ceramic Input and Output Capacitors Higher values, lower cost ceramic capacitors are now becoming available in smaller case sizes. Their high ripple current, high voltage rating and low ESR make them ideal for switching regulator applications. However, care must be taken when these capacitors are used at the input and output. When a ceramic capacitor is used at the input and the power is supplied by a wall adapter through long wires, a load step at the output can induce ringing at the input, VIN. At best, this ringing can couple to the output and be mistaken as loop instability. At worst, a sudden inrush of current through the long wires can potentially cause a voltage spike at VIN large enough to damage the part. 11 AME AME5252 Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Converter Thermal Considerations In most applications the AME5252 does not dissipate much heat due to its high efficiency. But, in applications where the AME5252 is running at high ambient temperature with low supply voltage and high duty cycles, such as in dropout, the heat dissipated may exceed the maximum junction temperature of the part. If the junction temperature reaches approximately 160O C, both power switches will be turned off and the SW node will become high impedance. To avoid the AME5252 from exceeding the maximum junction temperature, the user will need to do some thermal analysis. The goal of the thermal analysis is to determine whether the power dissipated exceeds the maximum junction temperature of the part. The temperature rise is given by: TR = ( PD)( θJA ) Where PD is the power dissipated by the regulator and θJA is the thermal resistance from the junction of the die to the ambient temperature. 12 Rev. C.01 AME Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Converter AME5252 Start-UP form Shutdown Pluse Skipping Mode EN 5V /Div VSW 5V /Div VOUT 1V/Div VOUT 10mV/Div IL 500mA/Div VIN=3.6V VOUT =1.8V IOUT=800mA ISW 200mA/Div 50µS/Div VIN=3.6V VOUT=1.8V ILOAD=50mA Load Step 1µS/Div Efficiency vs Input voltage 100 IOUT =100mA 95 VOUT 200mV /Div Efficiency(%) 90 ISW 500mV/Div 85 IOUT=600mA 80 75 IOUT=10mA 70 65 IOUT 500mA/Div 60 C 55 50 VIN=3.6V 20µS/Div VOUT =1.8V ILOAD =50mA to 600mA 2 5 6 Oscillator Frequency vs Supply Voltage 1.8 1.7 1.7 1.6 1.6 Frequency(MHz) Frequency(MHz) Oscillator Frequency vs Temperature 1.5 1.4 1.3 1.2 1.5 1.4 1.3 1.2 1.1 1.1 -15 +10 +35 +60 Temperature(o C) Rev.C.01 4 Input Voltage(V) 1.8 1.0 -40 3 +85 +110 1.0 2 3 4 5 6 Supply Voltage(V) 13 AME Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Converter AME5252 VFB vs Temperature RDS(ON) vs Input voltage 0.616 0.65 0.60 VIN=3.6V 0.612 0.55 RDS(ON) (mΩ) 0.608 VFB(V) 0.604 0.600 0.596 0.592 0.50 Main Switch 0.45 0.40 0.35 Synchronous Switch 0.30 0.588 0.25 0.584 -40 -15 +10 +35 +60 +85 0.20 +110 1 2 o RDS(ON) vs Temperature 0.65 90 VIN=2.7V 6 7 0.55 VIN=2.7V 80 VIN=4.2V Efficiency(%) RDS(O N) (mΩ) 5 Efficiency vs Load Current VIN=3.6V 0.60 0.50 0.45 0.40 0.35 0.30 70 60 VIN=4.2V 50 40 30 V IN=3.6V 20 Main Switch Synchronous Switch 0.25 0.20 -50 -25 0 +25 +50 +75 +100 10 0 1 +125 Temperature( oC) VOUT=2.5V 10 100 1000 I OUT (mA) Efficiency vs Load Current Efficiency vs Load Current 100 100 90 90 V IN=2.7V 80 VIN=2.7V 80 V IN=4.2V 70 Efficiency(%) Efficiency(%) 4 100 0.70 60 50 VIN =3.6V 40 70 VIN=4.2V 60 VIN=3.6V 50 40 30 20 30 VOUT=1.8V VOUT=1.2V 20 10 1 14 3 Input Voltage(V) Temperature( C) 10 I OUT (mA) 100 1000 1 10 100 1000 IOUT(mA) Rev. C.01 AME Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Converter AME5252 Output Voltage vs Load Current Efficiency vs Load Current 100 1.844 90 1.834 VIN=2.7V Efficiency(%) Efficiency(%) 80 70 V IN=3.6V 60 V IN =4.2V 50 1.824 1.814 1.804 1.794 40 1.784 30 20 V OUT =1.5V 1 10 100 1.774 1 1000 10 Current Limit vs VIN 2.10 1.8 2.00 1.90 Channel 1 1.80 Current Limit(A) Current Limit(A) 1.6 1.5 1.4 1.3 1.2 Channel 2 1.1 1.0 0.8 1.50 1.40 1.30 1.10 2.8 3.1 3.4 3.7 4.0 4.3 4.6 4.9 5.2 V IN=3.3V V OUT 1=1.2V V OUT 2=1.2V 0.80 C 0.70 -40 5.5 -25 -10 +5 +20 +35 +50 +65 +80 +95 +110 +125 V IN (V) Temperature(oC) Current Limit vs Temperature Current Limit vs Temperature 2.10 2.00 2.00 1.90 1.90 1.80 Current Limit(A) Channel 1 1.70 1.60 1.50 1.40 1.30 Channel 2 1.20 1.10 V IN =3.6V V OUT1=1.2V V OUT2=1.2V 1.00 0.90 0.80 -25 -10 +5 +20 +35 +50 +65 o Temperature( C) Rev.C.01 Channel 2 1.20 0.90 1.80 Current Limit(A) 1.60 2.10 0.70 -40 Channel 1 1.70 1.00 V OUT 1=1.2V V OUT 2=1.2V 0.9 0.7 2.5 1000 Current Limit vs Temperature 1.9 1.7 100 IOUT(mA) IOUT(mA) +80 +95 +110 +125 1.70 1.60 Channel 1 1.50 1.40 1.30 1.20 Channel 2 1.10 1.00 VIN=5.0V VOUT 1=1.2V VOUT 2=1.2V 0.90 0.80 0.70 -40 -25 -10 +5 +20 +35 +50 +65 +80 +95 +110 +125 Temperature( oC) 15 AME Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Converter AME5252 n Date Code Rule Month Code 1: January 7: July 2: February 8: August 3: March 9: September 4: April A: October 5: May B: November 6: June C: December n Tape and Reel Dimension DFN-10B (3mmx3mmx0.75mm) P PIN 1 W AME AME Carrier Tape, Number of Components Per Reel and Reel Size 16 Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size DFN-10B (3x3x0.75mm) 12.0±0.1 mm 4.0±0.1 mm 3000pcs 330±1 mm Rev. C.01 AME Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Converter AME5252 n Package Dimension DFN-10B (3mmx3mmx0.75mm) TOP VIEW BOTTOM VIEW e D L E E1 PIN 1 IDENTIFICATION b D1 A G1 G REAR VIEW MILLIMETERS MIN MAXC MIN MAX A 0.700 0.800 0.028 0.031 D 2.900 3.100 0.114 0.122 E 2.900 3.100 0.114 0.122 e 0.450 0.550 0.018 0.022 D1 2.300 2.500 0.091 0.098 E1 1.600 1.800 0.063 0.071 b 0.180 0.300 0.007 0.012 L 0.300 0.500 0.012 0.020 G 0.153 0.253 0.006 0.010 G1 0.000 0.050 0.000 0.002 SYMBOLS Rev.C.01 INCHES 17 www.ame.com.tw E-Mail: [email protected] Life Support Policy: These products of AME, Inc. are not authorized for use as critical components in life-support devices or systems, without the express written approval of the president of AME, Inc. AME, Inc. reserves the right to make changes in the circuitry and specifications of its devices and advises its customers to obtain the latest version of relevant information. AME, Inc. , September 2009 Document: 1045-DS5252-C.01 Corporate Headquarter AME, Inc. 2F, 302 Rui-Guang Road, Nei-Hu District Taipei 114, Taiwan. Tel: 886 2 2627-8687 Fax: 886 2 2659-2989