rev. notes 04/2009 up to 96% ·no need for heatsinks ·wide input range ·short circuit protection ·thermal shutdown ·low ripple and noise ·non-isolated The V78XX series of switching regulators is designed as a drop in replacement for 78XX linear regulators. Because the V78XX series features high efficiency under all line conditions, there is no need for a heatsink. Built-in short-circuit and over-temperature protections ensure very rugged operations. Additionally, low ripple and noise performance makes the parts useful in a wide range of applications. V7803-500-SMT V7805-500-SMT V7812-500-SMT V7815-500-SMT date features · efficiency description input voltage nominal 12 12 24 24 1 of 5 DESCRIPTION: DC switching regulator, non-isolated PART NUMBER: V78XX-500-SMT MODEL page input voltage range 4.5~28 V dc 6~28 V dc 14~28 V dc 17~28 V dc output voltage nominal 3.3 5 12 15 output voltage range 1.8~5.5 V dc 2.5~8 V dc 4.5~13.5 V dc 4.5~15.5 V dc output current 500 mA 500 mA 500 mA 500 mA efficiency Vin_min Vin_max 90% 75% 94% 81% 95% 90% 96% 92% 1. Vin-Vo>2V, If needed to adjust the output voltage . 2. If the input voltage is above specified then permanent damage may be caused to the device. 3. V7812-500-SMT and V7815-500-SMT are not allowed to operate under no load. OUTPUT SPECIFICATIONS item output voltage accuracy line regulation load regulation output ripple short circuit protection output current limit dynamic load stability quiescent current thermal shutdown temperature coefficient max load capacitance conditions min. at 100% load Vin = min. to max. at full load 10% to 100% full load 20 MHz bandwidth, output w/ 10μF cap continuous, auto recovery upon removal of short typ. ±2 ±0.2 ±0.3 10 1800 ±30 15 160 100%<->10% load normal input (3.3, 5 V output) -40°C ~ 85°C ambient max. ±3 ±0.5 ±0.75 25 unit % % % mVp-p 0.02 1000 mA mV mA °C %/°C μF unit ±75 GENERAL SPECIFICATIONS item On/Off control current On/Off shutdown threshold voltage shutdown input current operating temperature range operating case temperature storage temperature range cooling solderability storage humidity case material MTBF package weight conditions on: open or 1.5<Vc≤5V off: GND or 0V<Vc<1V see derating curve min. typ. max. 1.1 1.25 15 1.4 30 85 100 125 V μA °C °C °C 260 95 °C % -40 -55 free air convection 1.5 mm from case for 10 seconds relative humidity, non-condensing plastic (UL94-V0) at 25°C per MIL-HDBK-217F 2,000,000 2.3 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 hours grams rev. page 2 of 5 date 04/2009 DESCRIPTION: DC switching regulator, non-isolated PART NUMBER: V78XX-500-SMT (Side View) 11.02 [0.434] 7.00 [0.276] 7.25 [0.285] MECHANICAL DRAWINGS A 10 9 2.54 [0.100] 7 6 1.80 [0.071] 5 1 7 6 (Top View) 1 5 A 11.82 [0.466] 10 9 8.50[0.335] 2.54 [0.100] 0.25 [0.010] 2.54 [0.100] 1.00 [0.039] FOOTPRINT DETAILS 5° 1.13 [0.044] Pin 10.16[0.400] 15.24 [0.600] Note: Unit:mm[inch] Pin tolerances: 0.10mm[ 0.004inch] General tolerances: 0.25mm[ 0.010inch] Function 1 Vin 7,9 GND 5 Vout 6 Vadj 10 ON/OFF PACKAGING DIMENSIONS Taping dimension: 10.20 [0.402] 6.50 [0.256] 8.20 [0.323] 10.20[0.402] 12.40 [0.488] 16.00 [0.630] Taping reel dimension: ∅1.50 [0.059] ∅100.00[3.937] 0.50mm[ 0.020inch] L=530mm[20.866inch] Tube Quantity: 33pcs L=220mm[8.661inch] Tube Quantity: 13pcs THERMAL DERATING CURVE 7.65 [0.301] 29.40 [1.157] 5.60 [0.220] Note: Unit :mm[inch] General tolerances: 0.50 [0.020] ∅330.00 [12.992] 14.70 [0.579] 1.75 [0.069] 11.50 [0.453] 2.00 [0.079] 15.65 [0.616] ∅1.50 [0.059] ∅13.00 [0.512] ∅21.50 [0.846] Note: Unit :mm[inch] General tolerances: 0.50mm[ 0.020inch] Devices per reel quantity:500pcs SOLDER REFLOW PROFILE Temperature Derating Graph 25 0 Peak.Temp 240 C 10 Sec Max 220 C Tem pe ratu re ( C) 20 0 90 S ec M a x (>2 20 C ) 15 0 10 0 50 Operating Temp.( C ) 0 Tim e (s e c .) 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 rev. page 3 of 5 date 04/2009 DESCRIPTION: DC switching regulator, non-isolated PART NUMBER: V78XX-500-SMT TYPICAL APPLICATION CIRCUIT Choose a ceramic type capacitors; C3 is require ,for best performance , use a 100 F or more capacitor please. Vin 1 V78XX-500-SMT 10 C1 7 ,9 Vout 5 6 R1 106K/50V ON /O F F C3 100 F C5 R2 470p F GND 1. 2. 3. C2 2 2 6 K /2 5 V GND C1,C2: Use ceramic capacitors; C3: Use a 100 µF or more capacitor. C1,C2 are required and should be placed close to the pins of the converter, with shortest possible leads. No parallel connection or plug and play. EXTERNAL CAPACITOR TABLE Part Number C1 C2 (ceramic capacitor) (ceramic capacitor) V7803-500-SMT 10uF/50V 22uF/16V V7805-500-SMT 10uF/50V 22uF/16V V7812-500-SMT 10uF/50V 10uF/25V V7815-500-SMT 10uF/50V 10uF/25V OUTPUT TRIMMING Pa rt Na me Vo nom V7803-500-SMT 3.3 V V7805-500-SMT 5.0 V V7812-500-SMT 12V V7815-500-SMT 15V Trim Down Trim Up R 1(KΩ ) R 2(K Ω ) 75.1 0-10 *Vo = Vo -3.3 61 *Vo- 75.1 0 3.3-Vo 61*Vo-9 1.52 = 5.0 -Vo 71 *Vo- 287 .02 = 12-Vo = = 6 6*Vo -26 9.37 15-Vo 91.5 2-10 *Vo Vo -5.0 28 7.02- 20*Vo = Vo-1 2 = = 26 9.37- 15*Vo Vo-1 5 To trim the output of the device input the desired output voltage (Vo) into the proper equation. R1 trims the output voltage down and R2 trims the voltage up. If not using the trim feature place a 470pF ceramic capacitor between pin 6 and GND. Make sure that the desired output voltage is within the trim range. 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 rev. page 4 of 5 date 04/2009 DESCRIPTION: DC switching regulator, non-isolated PART NUMBER: V78XX-500-SMT TEST CIRCUIT 1) Efficiency and Output Voltage Ripple Test 25.4m m 25.4m m 12.7m m DC /DC Co nvert er 7 9 C1 Copp er strip 1 F 6 C2 C3 +Vout 10 F Cer amic Ta ntalum Scope 470pF C5 GND 5 Load 1 2.54mm Vin Cerami c Copper strip 2) Start-up and Load Transient Response Test 5 0.8 m m D C /DC C onv erter 7 9 C1 6 Co ppe r s trip +Vout Scope C2 C3 47 0p F C er am ic C5 GND 5 L oa d 1 2 .54 m m Vin Cop pe r s trip EFFICIENCY AND RIPPLE Efficiency (%) Ripple (m V) 100 45 90 40 80 35 70 V7803-500-SMT 60 V7805-500-SMT 50 V7812-500-SMT 40 V7815-500-SMT V7803-500-SMT 30 V7805-500-SMT 25 V7812-500-SMT V7815-500-SMT 20 15 30 20 10 10 5 0 0 20 50 80 120 160 200 240 280 320 360 400 440 480 500 550 Load (m A) 20 Efficiency VS Output Load (Vin=Norm) 50 80 120 160 200 240 280 320 360 400 440 480 500 550 Load (m A) Output Voltage Ripple VS Output Load (Vin=Norm) Ripple (mV) Efficiency (%) 100 45 95 40 90 35 85 V7803-500-SMT 80 V7803-500-SMT 30 V7805-500-SMT 75 70 65 V7805-500-SMT V7812-500-SMT 25 V7815-500-SMT 20 60 V7812-500-SMT V7815-500-SMT 15 55 10 50 5 45 0 40 4.5 6 8 10 12 14 16 17 20 22 24 26 28 Vin(V) Efficiency VS Input Voltage (Full Load) 4.5 6 8 10 12 14 16 17 20 22 24 26 28 Vin (V) Output Voltage Ripple VS Input Voltage (Full Load) 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 rev. page 5 of 5 date 04/2009 DESCRIPTION: DC switching regulator, non-isolated PART NUMBER: V78XX-500-SMT SHUTDOWN CONTROL The ON/OFF pin provides several features for adjusting and sequencing the power supply, a user has the flexibility of using the ON/OFF pin as: 1) A digital on/off control by pulling down the ON/OFF pin with an open-drain transistor. ON/OFF 2) Line UVLO. If desired to achieve a UVLO voltage, a resistor divider from Vin to ON/OFF to GND can be used to disable the converter until a higher input voltage is achieved. For example, it is not useful for a converter with 12V output to start up with a 12V input , as the output cannot each regulation. To enable the converter when the input voltage reaches 14V, a 51kΩ/5kΩ voltage divider from Vin to GND can be connected to the ON/OFF pin. Both the precision 1.25V threshold and 150mV hysteresis are multiplied by the resistor ratio, providing a proportional 12% hysteresis for any startup threshold. So, the turn off threshold would be between 12.3V to 15.7V. 1 51 KΩ C1 V78XX-500-SMT 10 7,9 5 +Vout 6 470pF 5 KΩ 100 F Lo ad Vin GND 3) Power supply sequencing. By connecting a small capacitor from ON/OFF to GND, the 2 A current source and 1.25V threshold can provide a stable and predictable delay between startup of multiple power supplies. For example, a startup delay of roughly 64mS is provided using 100nF, and roughly 136mS by using 200nF. +Vout 1 V78XX-500-SMT 5 C1 10 7,9 6 C5 470pF 100 F Loa d Vin 100nF GND CH1: Von/off CH2: Vo Delay time: 64mS 1 C1 V78XX-500-SMT 10 7,9 5 +Vo ut 6 C5 4 70 pF GND 1 00 F Load Vin 2 00 nF CH1: Von/off CH2: Vo Delay time: 136mS 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382