PAM2305 1A Step-Down DC-DC Converters Features General Description n n n n n n n n n n The PAM2305 is a step-down current-mode, DCDC converter. At heavy load, the constantfrequency PWM control performs excellent stability and transient response. To ensure the longest battery life in portable applications, the PA M 2 3 0 5 p r o v i d e s a p o w e r - s a v i n g P u l s e Skipping Modulation (PSM) mode to reduce quiescent current under light load operation to save power. Efficiency up to 96% Only 40 μ A(TYP.) Quiescent Current Output Current: Up to 1A Internal Synchronous Rectifier 1.5MHz Switching Frequency Soft Start Under-Voltage Lockout Short Circuit Protection Thermal Shutdown 5-pin Small SOT23-5, DFN2x2 6-Pin and QFN3x3 16-Pin Packages n Pb-Free Package The PAM2305 supports a range of input voltages from 2.5V to 5.5V, allowing the use of a single Li+/Li-polymer cell, multiple Alkaline/NiMH cell, USB, and other standard power sources. The output voltage is adjustable from 0.6V to the input voltage, while the part number suffix PAM2305XX indicates pre-set output voltage of 3.3V, 2.8V, 2.5V, 1.8V, 1.5V, 1.2V or adjustable. All versions employ internal power switch and synchronous rectifierfor to minimize external part count and realize high efficiency. During shutdown, the input is disconnected from the output and the shutdown current is less than 0.1 μ A. Other key features include under-voltage lockout to prevent deep battery discharge. Applications n n n n n n n n Cellular Phone Portable Electronics Wireless Devices Cordless Phone Computer Peripherals Battery Powered Widgets Electronic Scales Digital Frame The PAM2305 is available in SOT23-5, DFN2x2 6Pin and QFN3x3 16-Pin packages. Typical Application Fixed Output Voltage V IN C IN 10μF 1 VIN SW 5 GND Adjustable Output Voltage L Vo V IN Co 10μF C IN 10μF 2 3 EN VOUT 4 /FB 1 VIN SW 5 L Vo R1 GND 4 2 VOUT/FB C FW Co 10μF R2 3 EN R1 ö æ VO = 0.6 ´ ç1 + ÷ è R2 ø Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 1 PAM2305 1A Step-Down DC-DC Converters Block Diagram 1.5M OSC + IAMP - VIN + - + SLOPE COMP PWM COMP FB FREQ SHIFT OSC S Q R1 R Q - R2 + VIN RS LATCH EA MAIN SWITCH ( PCH ) SWITCHING LOGIC AND BLANKING CIRCUIT ANTI SHOOT THRU SW SYNCHRONOUS RECTIFIER ( NCH ) COMP 0.6VREF EN + IRCMP - SHUTDOWN GND Pin Configuration& Marking Information Top View DFN 2x2 6L Top View 5 SW 2 VIN 3 5 GND 4 SW GND GND GND VOUT/FB 1 P2305V XXXYW 2 3 12 VIN 11 VIN VIN VIN 10 4 9 5 6 7 EN NC 4 VOUT/FB EN 6 BEV YW EN 3 1 NC NC BEVYW GND 2 16 15 14 13 VOUT/FB GND VIN 1 SW SW QFN 3x3 16L NC SW Top View SOT23 - 5 8 BE: Product Code of PAM2305 V: Output Voltage Y: Year W: Week X: Internal Code Pin Description Name Function VIN Chip main power supply pin GND Ground EN Enable control input. Force this pin voltage above 1.5V, enables the chip, and below 0.3V shuts down the device. VOUT: Output voltage feedback pin, an internal resistive divider divides the output VOUT/FB voltage down for comparison to the internal reference voltage. FB: Feedback voltage to internal error amplifier, the threshold voltage is 0.6V. SW The drains of the internal main and synchronous power MOSFET. NC No connection Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 2 PAM2305 1A Step-Down DC-DC Converters Absolute Maximum Ratings These are stress ratings only and functional operation is not implied . Exposure to absolute maximum ratings for prolonged time periods may affect device reliability . All voltages are with respect to ground . Input Voltage..................................-0.3V to 6.6V EN, FB Pin Voltage.............................- 0.3V to V IN SW Pi n Voltage......................- 0.3V to ( V IN+0.3V ) Junction Temperature................................125°C Storage Temperature Range........-65°C to 150°C Soldering Temperature......................300°C , 5sec Recommended Operating Conditions Supply Voltage................................2.5V to 5.5V Max. Supply Voltage (for Max. duration of 30 minutes)................................................6.0V Ambient Temperature Range..........-40 °C to 85 °C Thermal Information Parameter Package Symbol Note Thermal Resistance (Junction to Case) Thermal Resistance (Junction to Ambient) Internal Power Dissipation SOT23-5 20 QFN 3x3 12 SOT23-5 102 θJA DFN 2x2 34 SOT23-5 400 PD QFN 3x3 °C/W 68 QFN 3x3 DFN 2x2 Unit 130 θJC DFN 2x2 Maximum 980 mW 1470 Note: The maximun output current for SOT23-5 package is limited by internal power dissipation capacity as described in Application Information hereinafter. Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 3 PAM2305 1A Step-Down DC-DC Converters Electrical Characteristic T A=25 °C , V IN=3.6V, V O=1.8V, C IN=10μF, C O=10μF,L=4.7μH, unless otherwise noted. PARAMETER SYMBOL Test Conditions MIN Input Voltage Range VIN 2.5 Regulated Feedback Voltage V FB 0.588 Reference Voltage Line Regulation ΔVFB Regulated Output Voltage Accuary VO Peak Inductor Current IPK TYP 0.6 MAX UNITS 5.5 V 0.612 V 0.3 IO = 100mA -3 VIN=3V,VFB = 0.5V or %/V +3 1.5 VO=90% % A Output Voltage Line Regulation LNR VIN = 2.5V to 5V, IO=10mA 0.2 0.5 %/V Output Voltage Load Regulation LDR IO=1mA to 800mA 0.5 1.5 % Quiescent Current IQ No load 40 70 μA Shutdown Current ISD VEN = 0V 0.1 1 μA Oscillator Frequency fOSC 1.5 1.8 MHz Drain-Source On-State Resistance SW Leakage Current High Efficiency VO = 100% 1.2 VFB = 0V or VO = 0V 500 kHz P MOSFET 0.3 0.45 Ω N MOSFET 0.35 0.5 Ω ILSW ±0.01 1 μA η 96 RDS(O N) IDS=100mA % EN Threshold High VEH 1.5 V EN Threshold Low VEL EN Leakage Current IEN ±0.01 μA Over Temperature Protection OTP 150 °C OTP Hysteresis OTH 30 °C 0.3 V Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 4 PAM2305 1A Step-Down DC-DC Converters Typical Performance Characteristics Efficiency vs Output Current (Vo=1.2V) 100 90 80 70 60 50 40 30 20 10 0 Efficiency vs Output Current (Vo=1.5V) 100 90 Efficiency(%) Efficiency(%) T A=25 °C , C IN=10 μ F, C O=10uF, L=4.7 μ H, unless otherwise noted. 70 60 50 40 Vin=3.6V 2.5V 3.6V 30 Vin=4.2V 4.2V Vin=5V 1 80 20 10 100 1 1000 100 90 90 80 80 Efficiency(%) Efficiency(%) Efficiency vs Output Current ( Vo=1.8V ) 100 70 60 50 3.6V 70 60 50 3V 3.6V 30 4.2V 4.2V 20 20 1 10 100 Output Current(mA) 1 1000 90 Efficiency(%) 80 70 60 50 40 3V 30 3.6V 4.2V 20 1 10 10 100 1000 Output Current(mA) Efficiency vs Output Current (Vo=2.8V) 100 Efficiency(%) 1000 Efficiency vs Output Current ( Vo=2.5V ) 40 2.5V 30 100 Output Current(mA) Output Current(mA) 40 10 100 1000 100 90 80 70 60 50 40 30 20 10 0 Eifficiency VS Output Current (Vo=3.3V) Vin=3.6V Vin=4.2V Vin=5V 1 Output Current(mA) 10 100 1000 Output Current(mA) Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 5 PAM2305 1A Step-Down DC-DC Converters Typical Performance Characteristics T A=25 °C , C IN=10 μ F, C O=10uF, L=4.7 μ H, unless otherwise noted. 100 90 90 80 80 Efficiency(%) Efficiency(%) Efficiency VS Input Voltage ( Vo=1.2V ) 100 70 60 50 Efficiency vs Input Voltage ( Vo=1.5V ) 70 60 50 10mA Io=10mA 40 40 Io=100mA 100mA 800mA Io=800mA 30 30 3 3.5 4 4.5 5 2.5 5.5 3 3.5 Efficiency vs Input Voltage ( Vo=1.8V ) 100 100 90 90 80 80 Efficiency(%) Efficiency(%) 4.5 5 5.5 Input Voltage(V) Input Voltage(V) 70 60 Efficiency vs Input Voltage ( Vo=2.5V ) 70 60 50 50 10mA 10mA 40 40 100mA 30 30 2.5 3 100mA 800mA 800mA 3.5 4 4.5 5 3 5.5 3.5 4 5 5.5 Eifficiency VS Input Voltage (Vo=3.3V) Efficiency vs Input Voltage ( Vo=2.8V ) 100 4.5 Input Voltage(V) Input Voltage(V) 100 90 90 80 Eifficiency(%) Efficiency(%) 4 70 60 50 10mA 40 100mA 80 70 60 50 40 30 20 Io=10mA Io=100mA 10 800mA Io=800mA 30 0 3 3.5 4 4.5 5 3.5 5.5 3.75 4 4.25 4.5 4.75 5 5.25 5.5 Input Voltage(V) Input Voltage(V) Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 6 PAM2305 1A Step-Down DC-DC Converters Typical Performance Characteristics T A=25 °C , C IN=10 μ F, C O=10uF,L=4.7 μ H, unless otherwise noted. Output Voltage VS Load Current Reference Voltage VS Input Voltage 1.215 0.602 Vin=3.6V 0.600 1.210 Output Voltage(V) 0.598 0.596 Vfb(V) 0.594 0.592 0.590 0.588 I=100mA I=600mA 0.586 1.205 1.200 1.195 1.190 1.185 Vo=1.2V 1.180 Vin=3.6V I=800mA 0.584 1.175 2 3 4 Input Voltage(V) 5 6 0 400 Load Current(mA) 600 800 Output Voltage VS Temperature Reference Voltage VS Temperature 0.620 1.194 0.615 1.193 Output Voltage(V) Reference Voltage(V) 200 0.610 0.605 0.600 0.595 1.192 1.191 Vo=1.2V 1.19 Vin=3.6V 1.189 0.590 Io=100mA 1.188 0 50 100 20 150 40 60 80 100 120 140 Temperature(°C) Tem perature(°C) Output Voltage VS Output Current Reference Voltage VS Load Current 1.205 0.604 Vo=1.2V 1.203 0.6 Output Voltage(V) 1.201 Vfb 0.596 0.592 0.588 1.199 1.197 1.195 1.193 2.5V 1.191 4.2V 3.6V Vin=2.7V 0.584 Vin=3.6V 5V Vin=4.2V 0.58 1.189 0 200 400 600 800 10 Load Current(mA) 110 210 310 410 510 610 710 810 Output Current(mA) Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 7 PAM2305 1A Step-Down DC-DC Converters Typical Performance Characteristics O T A=25 C, C IN=10 μ F, C O=10uF,L=4.7 μ H, unless otherwise noted. Dynamic Supply Current VS Input Voltage Dynamic Supply Current VS Temperature 60 Vo=1.2V 45 Dynamic Supply Current(uA) Dynamic Supply Current(uA) 50 ILoad=0A 40 35 30 25 20 15 10 50 40 30 Vo=1.2V 20 Vin=3.6V 10 ILoad=0A 5 0 0 2.5 3 3.5 4 4.5 Input Voltage(V) 5 40 5.5 60 100 120 140 Rdson VS Temperature R dson VS Input Voltage 0.6 0.4 Vin=3.6V Vin=3.6V 0.35 0.5 0.3 0.4 Rds(on) RDS(ON) 80 Temperature(°C) 0.25 0.3 0.2 0.2 0.15 0.1 0.1 0 Vin=4.2V Vin=3.6V Vin=2.7V 2 3 4 Input Voltage(V) 5 6 20 120 Oscillator Frequency VS Temperature Oscillator Frequency VS Supply Voltage 1.58 1.8 Vin=3.6V Vin=3.6V Oscillator Frequency(MHz) Oscillator Frequency(MHz) 70 Temperature(°C) 1.7 1.6 1.5 1.4 1.3 1.2 1.56 1.54 1.52 1.50 2 3 4 5 Supply Voltage(V) 6 7 20 40 60 80 100 120 140 Temperature(°C) Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 8 PAM2305 1A Step-Down DC-DC Converters Typical Performance Characteristics T A=25 °C ,C IN=10 μ F, C O=10uF,L=4.7 μ H, unless otherwise noted. Load Transient Io=0-500mA Vo=3.3V Vin=5V Load Transient Io=0-1A Vo=1.2V Vin=3.6V Output Current Output Current Voltage Output Voltage Output Start-up from Shutdown Vo=1.8V,Vin=3.6V Voltage Output Enable Inductor Current Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 9 PAM2305 1A Step-Down DC-DC Converters Application Information The basic PAM2305 application circuit is shown in Page 1. External component selection is determined by the load requirement, selecting L first and then Cin and Cout. The selection of Cout is driven by the required effective series resistance (ESR). Typically, once the ESR requirement for Cout has been met, the RMS current rating generally far exceeds the I RIPPLE(P-P) requirement. The output ripple △Vout is determined by: 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 V IN or Vout also increases the ripple current as shown in equation 1. A reasonable starting point for setting ripple current is △I L = 400mA (40% of 1A). DIL = 1 æ VOUT ö VOUT ç 1÷ f L VIN ø ( )( ) è 1 ö æ VVOUT @VIL ç ESR+ ÷ 8fCOUT ø è Where f = operating frequency, C OUT =output capacitance and Δ I L = ripple current in the inductor. For a fixed output voltage, the output ripple is highest at maximum input voltage since Δ I L increases with input voltage. (1) 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. Using ceramic capacitors can achieve very low output ripple and small circuit size. 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 1.4A rated inductor should be enough for most applications (1A + 400mA). For better efficiency, choose a low DC-resis tance inductor. Vo 1.2V 1.5V 1.8V 2.5V 3.3V L 2.2μH 2.2μH 2.2μH 4.7μH 4.7μH When choosing the input and output ceramic capacitors, choose the X5R or X7R dielectric formulations. These dielectrics have the best temperature and voltage charac teristics of all the ceramics for a given value and size. C IN and C OUT Selection Thermal consideration In continuous mode, the source current of the top MOSFET is a square wave of duty cycle Vout/Vin. To prevent large voltage transients, a low ESR input capacitor sized for the maximum RMS current must be used. The maximum RMS capacitor current is given by: é VOUT (VIN - VOUT )ùû CIN required IRMS @ IOMAX ë VIN Thermal protection limits power dissipation in the PAM2305. When the junction temperature exceeds 150°C, the OTP (Over Temperature Protection) starts the thermal shutdown and turns the pass transistor off. The pass transistor resumes operation after the junction temperature drops below 120°C. 1 2 For continuous operation, the junction temperature should be maintained below 125°C. The power dissipation is defined as: This formula has a maximum at V IN =2Vout, w h e r e I RMS= I OUT/ 2 . T h i s s i m p l e w o r s t - c a s e condition is com monly used for design because even significant deviations do not offer much relief. Note that the capacitor manufacturer's 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. Consult the manufac turer if there is any question. PD =IO 2 VORDSONH + (VIN -VO )RDSONL VIN + (t SW FSIO +IQ )VIN I Q is the step-down converter quiescent current. The term tsw is used to estimate the full load step-down converter switching losses. Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 10 PAM2305 1A Step-Down DC-DC Converters Table 1: Resistor selection for output voltage setting For the condition where the step-down converter is in dropout at 100% duty cycle, the total device dis sipation reduces to: 2 PD =IO RDSONH +IQ VIN Since R DS(ON), quiescent current, and switching losses all vary with input voltage, the total losses should be investigated over the complete input voltage range. The maximum power dissipation depends on the thermal resistance of IC package, PCB layout, the rate of surrounding airflow and temperature difference between junction and ambient. The maximum power dissipation can be calculated by the following formula: PD = Vo R1 R2 1.2V 100k 100k 1.5V 150k 100k 1.8V 200k 100k 2.5V 380k 120k 3.3V 540k 120k 100% Duty Cycle Operation As the input voltage approaches the output voltage, the converter turns the P-chan nel transistor continuously on. In this mode the output voltage is equal to the input voltage minus the voltage drop across the P - channel transistor: TJ(MAX) -TA θJA Where TJ(max) is the maximum allowable junction temperature 125°C.T A is the ambient temperature and θ JA is the thermal resistance from the junction to the ambient. Based on the standard JEDEC for a two layers thermal test board, the thermal resistance θ JA of SOT23-5 package is 250°C/W, DFN2X2 102°C/W, and QFN3X3 68°C/W, respectively. The maximum power dissipation at T A = 25°C can be calculated by following formula: V OUT = V IN – I LOAD (R dson + R L) where R dson = P-channel switch ON resistance, I L O A D = Output current, R L = Inductor DC resistance UVLO and Soft-Start The reference and the circuit remain reset until the VIN crosses its UVLO threshold. SOT-25 package: The PAM2305 has an internal soft-start circuit that limits the in-rush current during start-up. This prevents possible voltage drops of the input voltage and eliminates the output voltage overshoot. The soft-start acts as a digital circuit to increase the switch current in several steps to the P-channel current limit (1500mA). P D=(125°C-25°C)/250°C/W=0.4W DFN2*2 package: P D=(125°C-25°C)/102°C/W=0.984W QFN3*3 package: Short Circuit Protection P D=(125°C-25°C)/68°C/W=1.47W The switch peak current is limited cycle-by-cycle to a typical value of 1500mA. In the event of an output voltage short circuit, the device operates with a frequency of 400kHz and minimum duty cycle, therefore the average input current is typically 200mA. Setting the Output Voltage The internal reference is 0.6V (Typical). The output voltage is calculated as below: æ R1 ö VO=0.6×1+ ç R2 ÷ è ø Thermal Shutdown When the die temperature exceeds 150°C, a reset occurs and the reset remains until the temperature decrease to 120°C, at which time the circuit can be restarted. The output voltage is given by Table 1. Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 11 PAM2305 1A Step-Down DC-DC Converters PCB Layout Check List When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the PAM2305. These items are also illustrated graphically in Figure 1. 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 V FB pin connect directly to the feedback resistors? The resistive divider R1/R2 must be con nected between the (+) plate of C OUT 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 C IN and C OUT as close as possible. Figure 1 :PAM2305 Suggested Layout Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 12 PAM2305 1A Step-Down DC-DC Converters Ordering Information PAM 2305 X X X xxx Output Voltage Number of Pins Package Type Pin Configuration Pin Configuration A Type Package Type Number of Pins Output Voltage A: SOT-23 B: 5 330: 3.3V 1. VIN J: QFN 3x3 E: 16 280: 2.8V 2. GND G: DFN 2x2 F: 6 250: 2.5V 3. EN 180: 1.8V 4. VOUT/FB 150: 1.5V 5. SW 120: 1.2V B Type : ADJ: Adjustable 16 pins C Type: 1. NC 2. EN 3. VIN 4. SW 5. GND 6 : VOUT/FB Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 13 PAM2305 1A Step-Down DC-DC Converters Ordering Information Part Number Output Voltage Marking Package Type Standard Package PAM2305AAB330 3.3V BEKYW SOT23-5 3,000Units/Tape&Reel PAM2305AAB280 2.8V BEHYW SOT23-5 3,000Units/Tape&Reel PAM2305AAB250 2.5V BEGYW SOT23-5 3,000Units/Tape&Reel PAM2305AAB180 1.8V BEEYW SOT23-5 3,000Units/Tape&Reel PAM2305AAB150 1.5V BECYW SOT23-5 3,000Units/Tape&Reel PAM2305AAB120 1.2V BEBYW SOT23-5 3,000Units/Tape&Reel PAM2305AABADJ ADJ BEAYW SOT23-5 3,000Units/Tape&Reel PAM2305BJE330 3.3V P2305K QFN3x3 3,000Units/Tape&Reel PAM2305BJE280 2.8V P2305H QFN3x3 3,000Units/Tape&Reel PAM2305BJE250 2.5V P2305G QFN3x3 3,000Units/Tape&Reel PAM2305BJE180 1.8V P2305E QFN3x3 3,000Units/Tape&Reel PAM2305BJE150 1.5V P2305C QFN3x3 3,000Units/Tape&Reel PAM2305BJE120 1.2V P2305B QFN3x3 3,000Units/Tape&Reel PAM2305BJEADJ ADJ P2305A QFN3x3 3,000Units/Tape&Reel PAM2305CGF330 3.3V BEKYW DFN2x2-6 3,000Units/Tape&Reel PAM2305CGF280 2.8V BEHYW DFN2x2-6 3,000Units/Tape&Reel PAM2305CGF250 2.5V BEGYW DFN2x2-6 3,000Units/Tape&Reel PAM2305CGF180 1.8V BEEYW DFN2x2-6 3,000Units/Tape&Reel PAM2305CGF150 1.5V BECYW DFN2x2-6 3,000Units/Tape&Reel PAM2305CGF120 1.2V BEBYW DFN2x2-6 3,000Units/Tape&Reel PAM2305CGFADJ ADJ BEAYW DFN2x2-6 3,000Units/Tape&Reel Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 14 PAM2305 1A Step-Down DC-DC Converters Outline Dimensions c (REF.) SOT23-5 0.25 D e1 θ L1 (REF.) A2 A1 A E1 E L REF. REF. A A1 A2 c D E E1 L L1 θ b e e1 Min 0 0.70 2.70 2.60 1.40 0º 0.30 Millimeter Nom 1.10MAX 0.05 1.00 0.12REF. 2.90 2.80 1.60 0.45REF. 0.60REF. 5º 0.40 0.95REF. 1.90REF. Max 0.10 1.295 3.10 3.00 1.80 10º 0.50 Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 15 PAM2305 1A Step-Down DC-DC Converters Outline Dimensions DFN 2x2 Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 16 PAM2305 1A Step-Down DC-DC Converters Outline Dimensions 3x3 mm QFN 16 DIMENSIONS (Millieters) MIN TYP MAX A 0.70 0.75 0.80 A1 0.00 0.02 0.05 A2 0.20 b 0.18 0.25 0.30 D 2.90 3.00 3.10 D1 1.55 1.70 1.80 E 2.90 3.00 3.10 E1 1.55 1.70 1.80 e L 0.50BSC 0.30 0.40 0.50 N 16 aaa 0.08 bbb 0.10 Power Analog Microelectronics , Inc www.poweranalog.com 09/2008 Rev 1.2 17