AAT1156 1MHz 700mA Step-Down DC-DC Converter General Description Features The AAT1156 SwitchReg is a step-down switching converter ideal for applications where high efficiency is required over the full range of load conditions. The 2.7V to 5.5V input voltage range makes the AAT1156 ideal for single-cell lithium-ion/polymer battery applications. Capable of more than 700mA with internal MOSFETs, the current-mode controlled IC provides high efficiency over a wide operating range. Fully integrated compensation simplifies system design and lowers external parts count. • • • • • • • • • • • • • • • The AAT1156 is available in a Pb-free, 16-pin, 3x3mm QFN package and is rated over the -40°C to +85°C temperature range. SwitchReg™ VIN Range: 2.7V to 5.5V Up to 95% Efficiency 110mΩ RDS(ON) Internal Switches <1μA Shutdown Current 1MHz Step-Down Switching Frequency Fixed or Adjustable VOUT ≥ 0.8V Integrated Power Switches Current Mode Operation Internal Compensation Stable with Ceramic Capacitors Internal Soft Start Over-Temperature Protection Current Limit Protection 16-Pin QFN 3x3mm Package -40°C to +85°C Temperature Range Applications • • • • • • Cellular Phones Digital Cameras MP3 Players Notebook Computers PDAs Wireless Notebook Adapters Typical Application Efficiency vs. Load Current U1 AAT1156 R1 100 C1 10μF FB VP LX VP LX EN LX VCC C2 0.1 μF (VOUT = 2.5V; L = 4.7µH) 2.5V VP 100 R3 187k L1 4.7μH NC LL PGND NC PGND SGND PGND R4 59k C3, C4 2 x 22μF 95 Efficiency (%) INPUT VIN = 3.0V 90 85 VIN = 4.2V 80 75 VIN = 3.6V 70 65 60 55 50 1 C1 Murata 10μF 6.3V X5R GRM42-6X5R106K6.3 C3-C4 MuRata 22μF 6.3V GRM21BR60J226ME39L X5R 0805 L1 Sumida CDRH3D16-4R7NC 1156.2007.01.1.4 10 100 1000 Output Current (mA) 1 AAT1156 1MHz 700mA Step-Down DC-DC Converter Pin Descriptions Pin # Symbol 1, 2, 3 PGND 4 FB Feedback input pin. This pin is connected to the converter output. It is used to set the output of the converter to regulate to the desired value via an internal resistive divider. For an adjustable output, an external resistive divider is connected to this pin on the 1V model. 5 SGND Signal ground. Connect the return of all small signal components to this pin. (See board layout rules.) 6 LL Mode selector switch. When pulled low, the device enters light load mode. 7 EN Enable input pin. A logic high enables the converter; a logic low forces the AAT1156 into shutdown mode, reducing the supply current to less than 1μA. The pin should not be left floating. 8, 16 NC Not internally connected. 9 VCC 10, 11, 12 VP Input supply voltage for the converter power stage. Must be closely decoupled to PGND. 13, 14, 15 LX Connect inductor to these pins. Switching node internally connected to the drain of both high- and low-side MOSFETs. EP Function Main power ground return pin. Connect to the output and input capacitor return. (See board layout rules.) Bias supply. Supplies power for the internal circuitry. Connect to input power via low pass filter with decoupling to SGND. Exposed paddle (bottom); connect to PGND directly beneath package. Pin Configuration QFN33-16 (Top View) LX LX LX NC 13 14 15 16 PGND PGND PGND FB 1 12 2 11 3 10 4 9 VP VP VP VCC 8 7 6 5 NC EN LL SGND 2 1156.2007.01.1.4 AAT1156 1MHz 700mA Step-Down DC-DC Converter Absolute Maximum Ratings1 Symbol VCC, VP VLX VFB VEN TJ VESD Description VCC, VP to GND LX to GND FB to GND EN to GND Operating Junction Temperature Range ESD Rating2 - HBM Value Units 6 -0.3 to VP + 0.3 -0.3 to VCC + 0.3 -0.3 to 6 -40 to 150 3000 V V V V °C V Value Units 50 2.0 °C/W W Value Units -40 to 85 °C Thermal Characteristics Symbol ΘJA PD Description Maximum Thermal Resistance (QFN33-16) Maximum Power Dissipation (QFN33-16)4 (TA = 25°C) 3 Recommended Operating Conditions Symbol T Description Ambient Temperature Range 1. Stresses above those listed in Absolute Maximum Ratings may cause damage to the device. Functional operation at conditions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time. 2. Human body model is 100pF capacitor discharged through a 1.5kΩ resistor into each pin. 3. Mounted on a demo board (FR4, in still air). 4. Derate 20mW/°C above 25°C. 1156.2007.01.1.4 3 AAT1156 1MHz 700mA Step-Down DC-DC Converter Electrical Characteristics VIN = VCC = VP = 5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C. Symbol VIN VOUT VIL VIH VUVLO VUVLO(HYS) IIL IIH IQ ISHDN ILIM Description Input Voltage Range Output Voltage Tolerance VIN = VOUT + 0.2 to 5.5V, IOUT = 0 to 700mA Input Low Voltage Input High Voltage Under-Voltage Lockout Under-Voltage Lockout Hysteresis Input Low Current Input High Current Quiescent Supply Current Shutdown Current Current Limit RDS(ON)H High Side Switch On Resistance RDS(ON)L Low Side Switch On Resistance ΔVOUT(VOUT*ΔVIN) Load Regulation ΔVOUT/VOUT Line Regulation FOSC Oscillator Frequency Over-Temperature Shutdown TSD Threshold Over-Temperature Shutdown THYS Hysteresis 4 Conditions Min Typ Max Units 2.7 5.5 V -3 3 % 0.6 V V 1.4 VIN Rising, VEN = VCC VIN Falling, VEN = VCC 2.5 1.2 250 VIN = VFB = 5.5V VIN = VFB = 0V No Load, LL = 0V; VFB = 0V, VIN = 4.2V, TA = 25°C VEN = 0V, VIN = 5.5V TA = 25°C TA = 25°C TA = 25°C VIN = 4.2V, ILOAD = 0 to 700mA VIN = 2.7 to 5.5V TA = 25°C 220 1.0 1.0 mV μA μA 350 μA 1.0 μA A mΩ mΩ % %/V kHz 1.2 750 110 100 ±0.9 ±0.1 1000 V 150 150 1350 140 °C 15 °C 1156.2007.01.1.4 AAT1156 1MHz 700mA Step-Down DC-DC Converter Typical Characteristics Efficiency vs. Load Current Efficiency vs. Load Current (VOUT = 2.5V; L = 4.7µH) (VOUT = 0.8V; L = 2.2µH) 100 100 90 VIN = 3.0V 90 Efficiency (%) Efficiency (%) 95 85 VIN = 4.2V 80 75 VIN = 3.6V 70 65 60 VIN = 2.7V 80 70 VIN = 4.2V 60 VIN = 3.6V 50 40 30 55 20 50 1 10 100 1000 1 10 Soft Start (0.8V; 700mA; VIN = 3.6V) 20 1.4 10 1.2 -10 0.8 -20 0.6 -30 0.4 -40 0.2 -50 0 -60 -0.2 2 1.5 3 1 2.5 0.5 2 0 1.5 -0.5 1 -1 0.5 -1.5 0 -2 Time (2μ μs/div) -0.5 μs/div) Time (100μ Output Ripple Line Transient (0.8V; 700mA; VIN = 3.6V) (IOUT = 500mA; VO = 0.8V) 4.4 60 3 4.2 50 4 40 3.8 30 3.6 20 3.4 10 3.2 0 0 2.5 -10 2 -20 1.5 -30 1 -40 0.5 -50 0 -60 -0.5 Time (250ns/div) 1156.2007.01.1.4 Input Voltage (top) (V) 3.5 10 3 -10 2.8 -20 Output Voltage (AC coupled) (bottom) (mV) 20 Inductor Current (bottom) (A) Output Voltage (AC coupled) (top) (mV) 3.5 Inductor Current (bottom) (A) 1 Enable and Output Voltage (top) (V) Output Ripple (0.8V; 10mA; VIN = 3.6V) 0 1000 Output Current (mA) Inductor Current (bottom) (A) Output Voltage (AC coupled) (top) (mV) Output Current (mA) 100 Time (20μsec/div) 5 AAT1156 1MHz 700mA Step-Down DC-DC Converter Typical Characteristics Load Transient Response No Load Supply Current vs. Input Voltage (50mA to 680mA; VIN = 3.6V; VOUT = 0.8V) Output Voltage (top) (20mV/div) 0.79 0.77 0.75 Ø 0.73 0.71 Ø 0.69 0.67 Inductor and Load Current (bottom) (500mA/div) 0.81 Supply Current (μ μA) 300 0.83 200 150 25°C -40°C 100 50 0 2.5 Time (10μ μsec/div) 3.5 4 4.5 Output Voltage vs. Temperature DC Regulation (VIN = 4.2V; VOUT = 0.8V; 400mA VOUT) (VOUT = 0.6V) 0.1 3.0 0.0 2.0 -0.1 -0.2 -0.3 -0.4 -40 3 5 5.5 Input Voltage (V) Output Error (%) Output Voltage Error (%) 85°C 250 VIN = 4.2V 1.0 0.0 VIN = 3.6V -1.0 VIN = 2.7V -2.0 -3.0 -20 0 20 40 60 80 100 0.0001 0.001 0.01 0.1 1 Temperature (°°C) Output Current (A) Frequency vs. Temperature P-Channel RDS(ON) vs. Input Voltage (VIN = 3.6V) 200 1.2 100°C 160 RDS(ON) (mΩ Ω) Frequency (MHz) 180 1.1 1 0.9 0.8 120°C 140 120 100 85°C 80 25°C 60 40 0.7 20 0 0.6 -40 -20 0 20 40 Temperature (°°C) 6 60 80 100 2.5 3 3.5 4 4.5 5 5.5 Input Voltage (V) 1156.2007.01.1.4 AAT1156 1MHz 700mA Step-Down DC-DC Converter Typical Characteristics N-Channel RDS(ON) vs. Input Voltage 1.02 200 1.01 180 160 1 RDS(ON) (mΩ Ω) Frequency (MHz) Frequency vs. Input Voltage 0.99 0.98 0.97 0.96 100°C 120°C 140 120 100 80 85°C 60 25°C 40 0.95 20 0 0.94 2.7 3.2 3.7 4.2 Input Voltage (V) 1156.2007.01.1.4 4.7 5.2 5.7 2.5 3 3.5 4 4.5 5 5.5 Input Voltage (V) 7 AAT1156 1MHz 700mA Step-Down DC-DC Converter Functional Block Diagram VP = 2.7V to 5.5V VCC 1.0V REF FB OP. AMP CMP DH LOGIC 1MΩ LX DL Temp. Sensing OSC SGND Operation Control Loop EN LL PGND still providing sufficient DC loop gain for good load regulation. The voltage loop crossover frequency and phase margin are set by the output capacitor. The AAT1156 is a peak current mode step-down converter. The inner wide bandwidth loop controls the inductor peak current. The inductor current is sensed through the P-channel MOSFET (high side) and is also used for short-circuit and overload protection. A fixed slope compensation signal is added to the sensed current to maintain stability for duty cycles greater than 50%. The loop appears as a voltage-programmed current source in parallel with the output capacitor. Soft Start/Enable The voltage error amplifier output programs the current loop for the necessary inductor current to force a constant output voltage for all load and line conditions. The external voltage feedback resistive divider divides the output voltage to the error amplifier reference voltage of 0.6V. The voltage error amplifier DC gain is limited. This eliminates the need for external compensation components, while Power and Signal Source 8 Soft start increases the inductor current limit point in discrete steps once the input voltage or enable input is applied. It limits the current surge seen at the input and eliminates output voltage overshoot. When pulled low, the enable input forces the AAT1156 into a non-switching shutdown state. The total input current during shutdown is less than 1μA. Separate small signal ground and power supply pins isolate the internal control circuitry from the noise associated with the output MOSFET switching. The low pass filter R1 and C2 (shown in the schematic in Figure 1) filters the input noise associated with the power switching. 1156.2007.01.1.4 AAT1156 1MHz 700mA Step-Down DC-DC Converter Vin+ U1 AAT1156 Enable R1 100 R2 100K C1 10μF FB VP LX VP LX EN LX VCC C2 0.1 μF LL R6 100k Vout+ VP R3 200k L1 4.7μH N/C LL PGND N/C PGND SGND PGND R4 59k C3, C4 2 x 22μF C1 Murata 10μF 6.3V X5R GRM42-6X5R106K6.3 C3, C4 MuRata 22μF 6.3V GRM21BR60J226ME396 X5R 0805 L1 Sumida CDRH3D16-4R7NC Figure 1: AAT1156 Evaluation Board Schematic — Lithium-Ion to 2.5V Converter. Current Limit and Over-Temperature Protection For overload conditions, the peak input current is limited. As load impedance decreases and the output voltage falls closer to zero, more power is dissipated internally, raising the device temperature. Thermal protection completely disables switching when internal dissipation becomes excessive, protecting the device from damage. The junction over-temperature threshold is 140°C with 15°C of hysteresis. Inductor The output inductor is selected to limit the ripple current to a predetermined value, typically 20% to 40% of the full load current at the maximum input voltage. Manufacturer's specifications list both the inductor DC current rating, which is a thermal limitation, and the peak current rating, which is determined by the saturation characteristics. The inductor should not show any appreciable saturation under normal load conditions. Some inductors may meet the peak and average current ratings yet result in excessive losses due to a high DCR. Always consider the losses associated with the DCR and its effect on the total converter efficiency when selecting an inductor. For a 0.7A, 1.5V output with the ripple set to 40% at a maximum input voltage of 4.2V, the maximum peak-to-peak ripple current is 280mA. The inductance value required is 3.44μH. 1156.2007.01.1.4 L= VOUT ⎛ VOUT⎞ • 1IO • k • FS ⎝ VIN ⎠ L= 1.5V ⎛ 1.5V ⎞ ⋅10.7A ⋅ 0.4 ⋅ 1MHz ⎝ 4.2V⎠ L = 3.44μH The factor "k" is the fraction of full load selected for the ripple current at the maximum input voltage. For ripple current at 40% of the full load current, the peak current will be 120% of full load. Selecting a standard value of 3.3μH gives 42% ripple current. A 3.3μH inductor selected from the Sumida CDRH3D16 series has a 63mΩ DCR and a 1.1A DC current rating. At full load, the inductor DC loss is 31mW which amounts to less than 3% loss in efficiency for a 0.7A, 1.5V output. Input Capacitor The primary function of the input capacitor is to provide a low impedance loop for the edges of pulsed current drawn by the AAT1156. A low ESR/ESL ceramic capacitor is ideal for this function. To minimize stray inductance, the capacitor should be placed as closely as possible to the IC. This keeps the high frequency content of the input current localized, minimizing radiated and conducted EMI while facilitating optimum performance of the AAT1156. Ceramic X5R or X7R capacitors are ideal for this function. The size required will vary depending on 9 AAT1156 1MHz 700mA Step-Down DC-DC Converter the load, output voltage, and input voltage source impedance characteristics. Values range from 1μF to 10μF. The input capacitor RMS current varies with the input voltage and output voltage. The equation for the RMS current in the input capacitor is: VO ⎛ VO ⎞ ⋅ 1VIN ⎠ VIN ⎝ IRMS = IO ⋅ The input capacitor RMS ripple current reaches a maximum when VIN is two times the output voltage, where it is approximately one half of the load current. Losses associated with the input ceramic capacitor are typically minimal and are not an issue. Proper placement of the input capacitor is shown in the reference design layout in Figure 2. Output Capacitor Since there are no external compensation components, the output capacitor has a strong effect on loop stability. Larger output capacitance will reduce the crossover frequency with greater phase margin. For the 1.5V, 0.7A design using the 3.3μH inductor, two 22μF capacitors provide a stable output. In addition to assisting in stability, the output capacitor limits the output ripple and provides holdup during large load transitions. The output capacitor RMS ripple current is given by: IRMS = 1 2⋅ 3 ⋅ VOUT ⋅ (VIN - VOUT) Layout Figures 2 and 3 display the suggested PCB layout for the AAT1156. The following guidelines should be used to help ensure a proper layout. 1. The input capacitor (C1) should connect as closely as possible to VP (Pins 10, 11, and 12) and PGND (Pins 1, 2, and 3). 2. C3, C4, and L1 should be connected as closely as possible. The connection from L1 to the LX node should be as short as possible. 3. The feedback trace (Pin 4) should be separate from any power trace and connect as closely as possible to the load point. Sensing along a highcurrent load trace will degrade DC load regulation. 4. The resistance of the trace from the load return to PGND (Pins 1, 2, and 3) should be kept to a minimum. This will help to minimize any error in DC regulation due to differences in the potential of the internal signal ground and the power ground. 5. Low pass filter R1 and C2 provide a cleaner bias source for the AAT1156 active circuitry. C2 should be placed as closely as possible to SGND (Pin 5) and VCC (Pin 9). L ⋅ FS ⋅ VIN Figure 2: AAT1156 Evaluation Board Top Side. 10 For an X7R or X5R ceramic capacitor, the ESR is so low that dissipation due to the RMS current of the capacitor is not a concern. Tantalum capacitors with sufficiently low ESR to meet output voltage ripple requirements also have an RMS current rating well beyond that actually seen in this application. Figure 3: AAT1156 Evaluation Board Bottom Side. 1156.2007.01.1.4 AAT1156 1MHz 700mA Step-Down DC-DC Converter Thermal Calculations There are three types of losses associated with the AAT1156: MOSFET switching losses, conduction losses, and quiescent current losses. The conduction losses are due to the RDS(ON) characteristics of the internal Pand N-channel MOSFET power devices. At full load, assuming continuous conduction mode (CCM), a simplified form of the total losses is given by: P= IO2 ⋅ (RDS(ON)H ⋅ VO + RDS(ON)L ⋅ (VIN - VO)) + (tsw ⋅ FS ⋅ IO ⋅ VIN + IQ) ⋅ VIN VIN where IQ is the AAT1156 quiescent current. Once the total losses have been determined, the junction temperature can be derived from the θJA for the QFN33-16 package. TJ = P · ΘJA + TAMB Adjustable Output Resistors R3 and R4 of Figure 1 force the output to regulate higher than 0.6V. The optimum value for R4 is 59kΩ. Values higher than this may cause problems with stability, while lower values can degrade light load efficiency. For a 2.5V output with R4 set to 59kΩ, R3 is 187kΩ. ⎛ VO ⎞ ⎛ 2.5V ⎞ R3 = V -1 · R4 = 0.6V - 1 · 59kΩ = 187kΩ ⎝ REF ⎠ ⎝ ⎠ 500 R4=59kΩ 450 400 R3 (kΩ Ω) 350 300 250 200 150 100 50 0 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 Output Voltage (V) Figure 4: R3 vs. VOUT for Adjustable Output Using the AAT1156. 1156.2007.01.1.4 11 AAT1156 1MHz 700mA Step-Down DC-DC Converter Design Example Specifications IOUT 0.7A IRIPPLE 40% of Full Load at Max VIN VOUT 2.5V VIN 2.7V to 4.2V (3.6V nominal) FS 1MHz TAMB 85°C Maximum Input Capacitor Ripple: I RMS = I O · VO ⎛ V ⎞ · 1 - O = 0.34Arms, VIN = 2 · VO ⎝ VIN VIN ⎠ P = esr · IRMS2 = 5mΩ · 0.342 A = 0.6mW Inductor Selection: L= ⎛ V ⎞ VOUT 2.5V ⎛ 2.5V⎞ ⋅ 1 - OUT = ⋅ 1= 4.82μH I O ⋅ k ⋅ FS ⎝ VIN ⎠ 0.7A ⋅ 0.3 ⋅ 1MHz ⎝ 4.2V⎠ Select Sumida inductor CDRH3D16 or CDRH4D28 4.7μH. ΔI = ⎛ 2.5V⎞ VO ⎛ V ⎞ 2.5V ⋅ 1- O = ⋅ 1= 220mA 4.7μH ⋅ 1MHz ⎝ 4.2V⎠ L ⋅ FS ⎝ VIN ⎠ IPK = IOUT + ΔI = 0.7A + 0.11A = 0.81A 2 P = IO2 ⋅ DCR = (0.7A)2 ⋅ 80mΩ = 40mW 12 1156.2007.01.1.4 AAT1156 1MHz 700mA Step-Down DC-DC Converter Output Capacitor Ripple Current: 1 IRMS = 2· 3 · VOUT · (VIN - VOUT) 1 2.5V · (4.2V - 2.5V) · = 62mArms = L · FS · VIN 2 · 3 4.7μH · 1MHz · 4.2V Pesr = esr · IRMS2 = 5mΩ · (62 mA)2 = 19μW AAT1156 Dissipation: PTOTAL = = IO2 • (RDS(ON)H • VO + RDS(ON)L • (VIN -VO)) VIN + (tsw • FS • IO + IQ) • VIN (0.7A)2 • (0.17Ω • 2.5V + 0.16Ω • (4.2V - 1.5V)) 4.2V + (20nsec • 1MHz • 0.7A + 300μA) • 4.2V = 0.141W TJ(MAX) = TAMB + ΘJA • PLOSS = 85°C + 50°C/W • 0.141W = 92°C Efficiency vs. Load Current (VOUT = 0.8V; L = 2.2µH) U1 AAT1156 VP R1 100 C1 10μF 100 FB VP LX VP LX EN LX VCC C2 0.1 μF 0.8V N/C LL PGND N/C PGND SGND PGND R3 19.6k L1 2.2μH R4 59k C3, C4 2 x 22μF 90 Efficiency (%) INPUT VIN = 2.7V 80 70 VIN = 4.2V 60 VIN = 3.6V 50 40 30 20 C1 Murata 10μF 6.3V X5R GRM42-6X5R106K6.3 C3, C4 MuRata 22μF 6.3V GRM21BR60J226ME39L X5R 0805 L1 Sumida CDRH3D16-2R2NC 1 10 100 1000 Output Current (mA) Figure 5: 0.8V Solution. 1156.2007.01.1.4 13 AAT1156 1MHz 700mA Step-Down DC-DC Converter Surface Mount Inductors Manufacturer Part Number Value Max DC Current DCR Size (mm) LxWxH Type TaiyoYuden Toko Sumida Sumida Sumida Sumida Sumida Sumida MuRata MuRata NPO5DB4R7M A914BYW-3R5M-D52LC CDRH4D28-4R7 CDRH3D16-2R2 CDRH3D16-3R3 CDRH3D16-4R7 CDRH5D28-4R2 CDRH5D18-4R1 LQH55DN4R7M03 LQH66SN4R7M03 4.7μH 3.5μH 4.7μH 2.2μH 3.3μH 4.7μH 4.2μH 4.1μH 4.7μH 4.7μH 1.4A 1.34A 1.32A 1.2A 1.1A 0.9 2.2A 1.95A 2.7A 2.2A 0.038 0.073 0.072 0.050 0.063 0.080 0.031 0.057 0.041 0.025 5.9x6.1x2.8 5.0x5.0x2.0 4.7x4.7x3.0 3.8x3.8x1.8 3.8x3.8x1.8 3.8x3.8x1.8 5.7x5.7x3.0 5.7x5.7x2.0 5.0x5.0x4.7 6.3x6.3x4.7 Shielded Shielded Shielded Shielded Shielded Shielded Shielded Sielded Non-Shielded Shielded Value Voltage Temp. Co. Case 10μF 10μF 22μF 6.3V 6.3V 6.3V X5R X5R X5R 0805 1206 0805 Surface Mount Capacitors Manufacturer Part Number MuRata MuRata MuRata GRM40 X5R 106K 6.3 GRM42-6 X5R 106K 6.3 GRM21BR60J226ME39L 14 1156.2007.01.1.4 AAT1156 1MHz 700mA Step-Down DC-DC Converter Ordering Information Output Voltage Package Marking1 Part Number (Tape and Reel)2 0.6V (Adj VOUT ≥ 0.8V) QFN33-16 LUXYY AAT1156IVN-T1 All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means semiconductor products that are in compliance with current RoHS standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more information, please visit our website at http://www.analogictech.com/pbfree. Package Information3 0.230 ± 0.05 Pin 1 Identification 1 0.400 ± 0.100 1.70 ± 0.05 3.000 ± 0.05 13 9 0.500 ± 0.05 Top View 0.025 ± 0.025 Bottom View 0.214 ± 0.036 0.900 ± 0.100 Pin 1 Dot By Marking 3.000 ± 0.05 5 C0.3 Side View All dimensions in millimeters. 1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD. 3. The leadless package family, which includes QFN, TQFN, DFN, TDFN and STDFN, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection. © Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice. Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. AnalogicTech warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with AnalogicTech’s standard warranty. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed. AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders. Advanced Analogic Technologies, Inc. 830 E. Arques Avenue, Sunnyvale, CA 94085 Phone (408) 737- 4600 Fax (408) 737- 4611 1156.2007.01.1.4 15