AME 1A, 1.5MHz Synchronous Step-Down Converter AME5250 n General Description The AME5250 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. Capable of delivering 1A output current over a wide input voltage range from 2.5V to 5.5V, the AME5250 is ideally suited for single Li-Ion battery powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. Under light load conditions, the AME5250 operates in a power saving mode that consumes just around 20µA of supply current, maximizing battery life in portable applications. n Applications l l l l l Cellular Telephones Personal Information Appliances Wireless and DSL Modems MP3 Players Portable Instruments n Typical Application 2.2µH VIN IN The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Low output voltages are easily supported with the 0.6V feedback reference voltage. The AME5250 is available in small DFN-6D & QFN-16C packages. VOUT SW AME5250 CIN 4.7µF CER EN COUT 10µF CER OUT GND Other features include soft start, lower internal reference voltage with 2% accuracy, over temperature protection, and over current protection. Figure 1. High Efficiency Step-Down Converter n Features VIN 2.5V to 5.5V l l l l l High Efficiency: Up to 95% Very Low 20µA Quiescent Current High efficiency in light load condition 2.5V to 5.5V Input Range Adjustable Output From 0.6V to VIN l 1.0V, 1.2V, 1.5V, 1.6V, 1.8V, 2.5V and 3.3V Fixed/Adjustable Output Voltage l 1A Output Current l Low Dropout Operation: 100% Duty Cycle l No Schottky Diode Required l 1.5MHz Constant Frequency PWM Operation l Small DFN-6D & QFN-16C Packages l All AME’ s Lead Free Product Meet RoHS Standard Rev.B.04 Fixed Output Voltage 2.2µH IN SW AME5250 CIN 4.7µF CER EN CFWD FB GND VOUT 1.8V R1 1000mA 150K COUT 10µF CER R2 75K VOUT=V FB (R1+R2)/R2 Adjustable Output Voltage Figure 2. 1.8V at 1000mA Step-Down Requlator CFWD: 22pF~220pF 1 AME 1A, 1.5MHz Synchronous Step-Down Converter AME5250 n Function Block Diagram Constant Off -time Mode Select Slope COMP VIN IN 3 PWM COMP FB/ VOUT 6 0.6V 0. 6V VREF SW LOGIC 4 0.55V UVDET Soft Start EN 2 NMOS COMP IRCOMP OSC GND 5 Figure 3. Founction Block Diagram 2 Rev. B.04 AME 1A, 1.5MHz Synchronous Step-Down Converter AME5250 n Pin Configuration 16 3 9 10 AME5250 15 2 14 1 11 13 AME5250 12 8 4 7 5 6 6 AME5250-AVYxxx 1. NC 2. EN 3. IN 4. SW 5. GND 6. FB/OUT QFN-16C (3mmx3mmx0.75mm) Top View 5 DFN-6D (2mmx2mmx0.75mm) Top View 1 2 3 4 AME5250-AWExxx 9. IN 1. GND 10. IN 2. GND 11. IN 3. GND 12. IN 4. FB/OUT 13. SW 5. GND 14. SW 6. NC 15. SW 7. EN 16. NC 8. NC * Die Attach: Conductive Epoxy * Die Attach: Conductive Epoxy Note: The area enclosed by dashed line represents Exposed Pad and connect to GND. n Pin Description Pin Number Pin Name Pin Description DFN QFN 1 6, 8, 16 NC No connection. Not internally connected. Can left floating or connected to GND. 2 7 EN Enable Control Input, active high. 3 9, 10, 11, 12 IN Input Supply Voltage Pin. Bypass this pin with a capacitor as close to the device as possible. 4 13, 14, 15 SW Switch Node Connection to Inductor. 5 1, 2, 3, 5 GND Ground. Tie directly to ground plane. 6 4 FB/OUT Rev.B.04 Output voltage Feedback input. 3 AME 1A, 1.5MHz Synchronous Step-Down Converter AME5250 n Ordering Information AME5250 - x x x xxx Output Voltage Number of Pins Package Type Pin Configuration & Special Feature Pin Configuration & Special Feature A (DFN-6D) A (QFN-16C) 4 1. 2. 3. 4. 5. 6. NC EN IN SW GND FB/OUT 1. GND 2. GND 3. GND 4. FB/OUT 5. GND 6. NC 7. EN 8. NC 9. IN 10. IN 11. IN 12. IN 13. SW 14. SW 15. SW 16. NC Package Type V: DFN W: QFN Number of Pins Y: 6 E: 16 Output Voltage 100: 120: 150: 160: 180: 250: 330: ADJ: 1.0V 1.2V 1.5V 1.6V 1.8V 2.5V 3.3V Adjustable Rev. B.04 AME 1A, 1.5MHz Synchronous Step-Down Converter AME5250 n Available Opetions Part Number Marking* Output Voltage Package Operating Ambient Temperature Range AME5250-AVYADJ 5250 AMXX ADJ DFN-6D -40oC to +85oC AME5250-AVY120 5250 BMXX 1.2V DFN-6D -40oC to +85oC AME5250-AVY180 5250 CMXX 1.8V DFN-6D -40oC to +85oC AME5250-AVY330 5250 DMXX 3.3V DFN-6D -40oC to +85oC AME5250-AWEADJ A5250 AMyMXX ADJ QFN-16C -40oC to +85oC Note: 1. The first 1 or 2 places represent product code. It is assigned by AME such as A or AM. 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 5250 or A5250. 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 Input Supply Voltage EN, VOUT Voltage SW Voltage ESD Classification Symbol Maximum VIN -0.3 to 6.5 VEN, V OUT -0.3 to VIN VSW -0.3 to VIN Unit V B* Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device. * HBM B: 2000V~3999V Rev.B.04 5 AME 1A, 1.5MHz Synchronous Step-Down Converter AME5250 n Recommended Operating Conditions Parameter Symbol Rating Unit Supply Voltage Voltage VIN 2.5 to 5.5 V Ambient Temperature Range TA -40 to +85 o C Junction Temperature Range TJ -40 to +125 o C n Thermal Information Parameter Package Die Attach Thermal Resistance* (Junction to Case) Thermal Resistance (Junction to Ambient) Symbol Maximum θJ C 85 o DFN-6D Conductive Epoxy θJA 160 Internal Power Dissipation PD 625 Thermal Resistance* (Junction to Case) θJ C 67 Thermal Resistance (Junction to Ambient) Unit mW o QFN-16C Internal Power Dissipation Solder Iron (10Sec)** Conductive Epoxy θJA 149 PD 670 350 C/W C/W mW o C * Measure θJC on backside center of Exposed Pad. ** MIL-STD-202G 210F 6 Rev. B.04 AME 1A, 1.5MHz Synchronous Step-Down Converter AME5250 n Electrical Specifications VIN=3.6V, VOUT=2.5V, VFB=0.6V, L=2.2µH, CIN=4.7µF, COUT=10µF, TA=25oC, IMAX=1A unless otherwise specified. Parameter Input voltage Symbol Test Condition VIN VIN =2.5 to 5.5V, in PWM mode For Fixed Output Voltage Min Typ Max Units 2.5 5.5 V -3 3 % VFB VIN-0.2 V 0.612 V 50 nΑ Output Voltage Accuracy ∆VOUT Adjustable Output Range Vout Feedback Voltage VFB For Adjustable OutputVoltage 0.588 Feedback Pin Bias Current IFB VFB=VIN -50 Quiescent Current (For Adjustable Output Voltage) IQ IOUT=0mA, V FB=1V 20 35 µA Quiescent Current (For Fixed Output Voltage) IQ IOUT=0mA, in PFM mode 35 40 µA Shutdown Current ISHDN VEN =GND 0.1 1 µA Switch Frequency fOSC 1.5 1.8 MHz 1.2 0.6 High-side Switch On-Resistance RDS,ON, LHI ISW =200mA, VIN =3.6V 0.28 Ω Low-side Switch On-Resistance RDS,ON, LO ISW =200mA, VIN =3.6V 0.25 Ω Switch Current Limit ISW,CL VIN =2.5 to 5.5V 1.4 1.6 A EN High (Enabled the Device) V EN,HI VIN =2.5 to 5.5V 1.5 EN Low (Shutdown the Device) VEN,LO VIN =2.5 to 5.5V Input Undervoltage Lockout V UVLO rising edge Input Undervoltage Lockout Hysteresis VUVLO,HYST Thermal Shutdown Temperature OTP Maximum Duty Cycle DMAX SW Leakage Current Rev.B.04 V 0.4 Shutdown, temperature increasing 1.8 V 0.1 V o 160 C 100 EN=0V, VIN =5.0V VSW =0V or 5.0V -1 V % 1 µA 7 AME 1A, 1.5MHz Synchronous Step-Down Converter AME5250 n Detailed Description Main Control Loop AME5250 uses a constant frequency, current mode step-down architecture. Both the main (P-channel MOSFET) and synchronous (N-channel MOSFET) switches are intermal. During normal operation, the internal top power MOSFET is turned on each cycle when the oscillator sets the RS latch, and turned off when the current comparator resets the RS latch. While the top MOSFET is off, the bottom MOSFET is turned on until either the inductor current starts to reverse as indicated by the current reversal comparator IRCMP. Short-Circuit Protection When the output is shorted to ground, the frequency of the oscillator is reduced to about 180KHz. This frequency foldback ensures that the inductor current hsa more time do decay, thereby preventing runaway. The oscillator’ s frequency will progressively increase to 1.5MHz when VFB or VOUT rises above 0V. Dropout Operation As the input supply voltage decreases to a value approaching the output voltage, the duty cycle increases toward the maximum on-time. Further reduction of the supply voltage forces the main switch to remain on for more than one cycle until it reaches 100% duty cycle. The output voltage will then be determined by the input voltage minus the voltage drop across the P-channel MOSFET and the inductor. 8 n Application Information The basic AME5250 application circuit is shown in Typical Application Circuit. External component selection is determined by the maximum load current and begins with the selection of the inductor value and followed by CIN and COUT. Inductor Selection For a given input and output voltage, the inductor value and operating frequency determine the ripple current. The ripple current DIL increases with higher VIN and decreases with higher inductance. ∆I L = V 1 × VOUT (1 − OUT ) VIN f ×L A reasonable starting point for setting ripple current is ∆IL=0.4(lmax). 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. For better efficiency, choose a low DC-resistance inductor. CIN and COUT Selection The input capacitance, CIN is needed to filter the trapezoidal current at the source of the top MOSFET. To prevent large voltage transients, a low ESR input capacitorsized for the maximum RMS current must be used. The maximum RMS capacitor current is given by: I RMS = I OUT ( MAX ) × VI N VOUT × −1 VIN VOUT This formula has a maximum at VIN=2VOUT, 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 the capacitor manufacturer ripple current ratings are often based on 2000 hours of life. This makes it advisable to further derate the capacitor, or choose a capacitor rated at a higher temperature than required. Rev. B.04 AME 1A, 1.5MHz Synchronous Step-Down Converter AME5250 The selection of COUT is determined by the effective series resistance(ESR) that is required to minimize voltage ripple and load step transients. The output ripple, VOUT, is determined by: ∆VOUT ≅ ∆I L ESR + 1 8 fCOUT 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. Thermal Considerations In most applications the AME5250 does not dissipate much heat due to its high efficiency. But, in applications where the AME5250 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 160OC, both power switches will be turned off and the SW node will become high impedance. To avoid the AME5250 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)(θ JA ) 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. Output Voltage Programming The output voltage is set by an external resistive divider according to the following equation: VOUT = V REF × 1 + R1 R2 Where VREF equals to 0.6V typical. The resistive divider allows the FB pin to sense a fraction of the output voltage as shown in Figure 4. 0.6V ≤ V OUT ≤ 5.5V R1 FB AME5250 R2 GND Figure 4. Setting the AME5250 Output Voltage Rev.B.04 9 AME 1A, 1.5MHz Synchronous Step-Down Converter AME5250 VIN 2.5V to 5.5V 2.2µH IN CIN 4.7µF CER VIN 2.5V to 5.5V GND FB 150K 150K SW AME5250 CFWD COUT 10µF CER CIN 4.7µF CER VOUT 1.6V 2.2µH IN SW AME5250 EN VOUT 1.2V EN GND FB CFWD 150K 90K COUT 10µF CER Figure 5. 1.2V Step-Down Regulator Figure 8. 1.6V Step-Down Regulator CFWD: 22pF~220pF CFWD: 22pF~220pF VIN 3.3V to 5.5V 2.2µH IN CIN 4.7µF CER VIN 3.6V to 5.5V GND FB 150K 100K SW AME5250 CFWD COUT 10µF CER CIN 4.7µF CER VOUT 3.3V 2.2µH IN SW AME5250 EN VOUT 1.5V EN GND FB CFWD 150K 33.3K COUT 10µF CER Figure 6. 1.5V Step-Down Regulator Figure 9. 3.3V Step-Down Regulator CFWD: 22pF~220pF CFWD: 22pF~220pF VIN 2.7V to 5.5V 2.2µH IN SW AME5250 CIN 4.7µF CER EN VOUT 2.5V GND FB CFWD 150K 47.3K COUT 10µF CER Figure 7. 2.5V Step-Down Regulator CFWD: 22pF~220pF 10 Rev. B.04 AME 1A, 1.5MHz Synchronous Step-Down Converter AME5250 PC Board Layout Checklist When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the AME5250. These items are also illustrated graphically in Figures 10 and Figures 11 . Check the following in your layout: 1. The power traces, consisting of the GND trace, the SW trace and the VIN trace should be kept short, direct and wide. 2. Does the VFB pin connect directly to the feedback resistors? The resistive divider R2/R1 must be connected between the (+) plate of COUT and ground. 3. Does the (+) plate of CIN connect to VIN as closely as possible? This capacitor provides the AC current to the internal power MOSFETs. 4. Keep the switching node, SW, away from the sensitive VFB node. 5. Keep the (-) plates of CIN and COUT as close as possible. L1 VIN AME5250 CIN VOUT SW IN EN C1 R1 COUT FB L1 VIN VOUT SW IN AME5250 CIN EN COUT OUT COUT R2 GND NC AME5250 AME5250 NC EN 1 2 6 5 FB GND L1 VIN 3 4 Output capacitor must be near AME5250 CIN SW should be connected to Inductor by wide and short trace, keep sensitive components away from this trace 1 6 VOUT EN 2 5 GND VIN C1 3 4 R2 Output capacitor must be near AME5250 SW R1 Figure 10. AME5250 Adjustable Voltage Regulator Layout Diagram Rev.B.04 NC L1 SW COUT CIN must be placed between VDD and GND as closer as possible GND NC COUT CIN CIN must be placed between VDD and GND as closer as possible SW should be connected to Inductor by wide and short trace, keep sensitive components away from this trace Figure 11. AME5250 Fixed Voltage Regulator Layout Diagram 11 AME 1A, 1.5MHz Synchronous Step-Down Converter AME5250 n Application Information External components selection Supplier Inductance (µ µH) Current Rating (mA) DCR (mΩ Ω) Dimensions (mm) TAIYO YUDEN 2.2 1480 60 3.00 x 3.00 x 1.50 NR 3015 GOTREND 2.2 1500 58 3.85 x 3.85 x 1.80 GTSD32 Sumida 2.2 1500 75 4.50 x 3.20 x 1.55 CDRH2D14 Sumida 4.7 1000 135 4.50 x 3.20 x 1.55 CDRH2D14 TAIYO YUDEN 4.7 1020 120 3.00 x 3.00 x 1.50 NR 3015 GOTREND 4.7 1100 146 3.85 x 3.85 x 1.80 GTSD32 Series Table 1. Recommended Inductors Capacitance (µ µH) Package TDK 4.7 603 C1608JB0J475M MURATA 4.7 603 GRM188R60J475KE19 TAIYO YUDEN 4.7 603 JMK107BJ475RA TAIYO YUDEN 10 603 JMK107BJ106MA TDK 10 805 C2012JB0J106M MURATA 10 805 GRM219R60J106ME19 MURATA 10 805 GRM219R60J106KE19 TAIYO YUDEN 10 805 JMK212BJ106RD Supplier Part Number Table 2. Recommended Capacitors for CIN and COUT 12 Rev. B.04 AME 1A, 1.5MHz Synchronous Step-Down Converter AME5250 n Characterization Curve Efficiency vs. Output Current Efficiency vs. Output Current 100 100 Efficiency(%) Efficiency(%) 90 VIN = 2.7V 90 80 70 60 80 70 60 50 50 VOUT = 2.5V 40 0. 1 VIN = 3.6V 1 COUT = 10µF L = 2.2µH 10 VOUT = 2.5V 100 40 0.1 1000 1 COUT = 10µF L = 2.2µH 10 100 Output Current(mA) Output Current(mA) Efficiency vs. Output Current Efficiency vs. Output Current 100 100 90 90 Efficiency(%) VIN = 2.7V Efficiency(%) 80 70 60 50 VIN = 3.6V 80 70 60 50 VOUT = 1.5V 40 0.1 1 COUT = 10µF L = 2.2µH 10 100 VOUT = 1.5V 40 0.1 1000 Output Current(mA) 1 COUT = 10µF L = 2.2µH 10 100 Efficiency vs. Output Current Efficiency vs. Output Current 100 VIN = 2.5V Efficiency(%) Efficiency(%) VIN = 5.5V 90 90 80 70 60 50 80 70 60 50 VOUT = 1.2V Rev.B.04 1000 Output Current(mA) 100 40 0.1 1000 1 COUT = 10µF L = 2.2µH 10 100 Output Current(mA) VOUT = 1.2V 1000 40 0.1 1 COUT = 10µF L = 2.2µH 10 100 1000 Output Current(mA) 13 AME 1A, 1.5MHz Synchronous Step-Down Converter AME5250 n Characterization Curve (Contd.) Reference Voltage vs. Temperature Frequency vs. Temperature 1.70 0.620 1.65 1.60 0.610 Frequency(MHz) Reference Voltage(V) 0.615 0.605 0.600 0.595 0.590 1.50 1.45 1.40 1.35 1.30 1.25 1.20 0.585 VIN = 3.6V 0.580 -50 -25 0 +25 +50 +75 +100 VIN = 3.6V 1.15 1.10 +125 -50 +50 +75 +100 +125 Output Voltage vs. Output Current 1.90 1.65 1.89 1.60 1.88 1.55 1.87 1.50 1.45 1.40 1.35 1.30 1.25 1.85 1.84 1.83 1.82 1.81 1.80 1.20 1.79 1.15 1.78 3.0 3.5 4.0 V IN(V) 4.5 5.0 5.5 1.77 100 +5 +20 +35 +50 300 400 500 600 700 800 900 1000 Current Limit vs. Temperature Current Limit(A) -10 200 Output Current(mA) V IN = 3.3V V OUT = 1.2V -25 V OUT = 1.8V V IN = 3.6V 1.86 Current Limit vs. Temperature Current Limit(A) +25 Frequency vs. Supply Voltage 1.10 2.5 +65 +80 +95 +110 +125 o Temperature ( C) 14 0 Temperature (oC) 1.70 3.0 2.9 2.8 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0 1.9 1.8 1.7 1.6 1.5 1.4 1.3 -40 -25 Temperature (oC) Output Voltage(V) Frequency(MHz) 1.55 3.0 2.9 2.8 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0 1.9 1.8 1.7 1.6 1.5 1.4 1.3 -40 V IN = 3.6V V OUT = 1.2V -25 -10 +5 +20 +35 +50 +65 +80 Temperature (oC) +95 +110 +125 Rev. B.04 AME 1A, 1.5MHz Synchronous Step-Down Converter AME5250 n Characterization Curve (Contd.) Current Limit (A) Current Limit vs. Temperature 3.0 2.9 2.8 2.7 2.6 2.5 2.4 2.3 2.2 Light Load Mode Output Voltage Ripple VIN = 5.0V VOUT = 1.2V 2.1 2.0 1.9 1.8 1.7 1.6 1.5 1.4 1.3 -40 -25 -10 +5 +20 +35 +50 +65 +80 Temperature ( C) o 5µS/Div +95 +110 +125 VIN = 3.6V VOUT = 1.8V IOUT = 50mA 1) VSW= 5V/Div 2) VOUT = 100mV/Div 3) IL = 200mA/Div Rev.B.04 Power Off from EN Load Step 50µS/Div 40µS/Div VIN = 3.6V VOUT = 1.8V IOUT = 1A VIN = 3.6V VOUT = 1.8V IOUT = 0A~1A~0A 1) EN = 2V/Div 2) VOUT = 2V/Div 3) IL = 500mA/Div 1) VOUT= 100mV/Div 2) IOUT = 500mA/Div 15 AME 1A, 1.5MHz Synchronous Step-Down Converter AME5250 n Characterization Curve (Contd.) Load Step Load Step 40µS/Div 40µS/Div VIN = 3.6V VOUT = 1.8V IOUT = 50mA~1A~50mA VIN = 3.6V VOUT = 1.8V IOUT = 100mA~1A~100mA 1) VOUT= 100mV/Div 2) IOUT = 500mA/Div 1) VOUT= 100mV/Div 2) IOUT = 500mA/Div Load Step Power On from EN 40µS/Div 400µS/Div VIN = 3.6V VOUT = 1.8V IOUT = 200mA~1A~200mA 1) VOUT= 100mV/Div 2) IOUT = 500mA/Div 16 VOUT = 1.2V IOUT = 1A 1) EN= 2V/Div 2) VOUT = 500mV/Div 3) IL = 1A/Div Rev. B.04 AME 1A, 1.5MHz Synchronous Step-Down Converter AME5250 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 Marking A M X X Year xxx0 M X X xxx1 A M X X xxx2 A A M X X xxx3 A A A M X X xxx4 A A A M X X xxx5 A A A M X X xxx6 A A A M X X xxx7 A A A M X X xxx8 A A A M X X xxx9 A A A A A A A A n Tape and Reel Dimension DFN-6D (2mmx2mmx0.75mm) P PIN 1 W AME AME Carrier Tape, Number of Components Per Reel and Reel Size Rev.B.04 Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size DFN-6D (2x2x0.75mm) 8.0±0.1 mm 4.0±0.1 mm 3000pcs 180±1 mm 17 AME 1A, 1.5MHz Synchronous Step-Down Converter AME5250 n Tape and Reel Dimension QFN-16C (3mmx3mmx0.75mm) P PIN 1 W AME AME Carrier Tape, Number of Components Per Reel and Reel Size 18 Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size QFN-16C (3x3x0.75mm) 12.0±0.1 mm 4.0±0.1 mm 3000pcs 330±1 mm Rev. B.04 AME 1A, 1.5MHz Synchronous Step-Down Converter AME5250 n Package Dimension DFN-6D (2mmx2mmx0.75mm) D e b E L E1 PIN 1 IDENTIFICATION D1 TOP VIEW A BOTTOM VIEW G1 G REAR VIEW SYMBOLS A INCHES MIN MAX MIN MAX 0.700 0.800 0.028 0.031 D 1.900 2.100 0.075 0.083 E 1.900 2.100 0.075 0.083 e Rev.B.04 MILLIMETERS 0.650 TYP 0.026 TYP D1 1.100 1.650 0.043 0.065 E1 0.600 1.050 0.024 0.041 b 0.180 0.350 0.007 0.014 L 0.200 0.450 0.008 0.018 G 0.178 0.228 0.007 0.009 G1 0.000 0.050 0.000 0.002 19 AME 1A, 1.5MHz Synchronous Step-Down Converter AME5250 n Package Dimension QFN-16C (3mmx3mmx0.75mm) e b E E1 k L D D1 PIN 1 IDENTIFICATION Bottom View A3 A A1 Top View Real View SYMBOLS INCHES MIN MAX MIN MAX A 0.700 0.800 0.028 0.031 A1 0.000 0.050 0.000 0.002 A3 0.203REF. 0.008REF. D 2.924 3.076 0.115 0.121 E 2.924 3.076 0.115 0.121 D1 1.600 1.800 0.063 0.071 E1 1.600 1.800 0.063 0.071 k b e L 20 MILLIMETERS 0.200MIN. 0.180 0.280 0.500TYP. 0.324 0.476 0.008MIN. 0.007 0.011 0.020TYP. 0.013 0.019 Rev. B.04 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. , January 2014 Document: 1283-DS5250-B.04 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