rev. The V78XX series of switching regulators are designed to replace 78XX linear regulators, with the objective of drop-in replacement without the need for a heatsink, because the V78XX series features high efficiency under all line conditions. Built-in short-circuit and over-temperature protections ensure very rugged operations. Additionally, low ripple and noise performance make the parts useful in a wide range of applications. model number V7803-1000 V7805-1000 V7806-1000 V7809-1000 V7812-1000 input voltage range 4.75~28 Vdc 6.5~32 Vdc 8~32 Vdc 11~32 Vdc 15~32 Vdc 1 of 4 date 04/2008 DESCRIPTION: DC switching regulator, non-isolated PART NUMBER: V78XX-1000 series description page features · efficiency up to 95% ·no need for heatsinks ·wide input range ·short circuit protection ·thermal shutdown ·low ripple and noise ·pin compatible to LM78XX series ·non-isolated output voltage 3.3 Vdc 5 Vdc 6.5 Vdc 9 Vdc 12 Vdc output current 1000 mA 1000 mA 1000 mA 1000 mA 1000 mA efficiency Vin_min Vin_max 90% 83% 93% 88% 94% 90% 95% 92% 95% 94% OUTPUT SPECIFICATIONS item output voltage accuracy line regulation load regulation output ripple short circuit protection short circuit input power output current limit switching frequency 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 load impedance is≤ 0.1Ω subject to over-temp shutdown fixed switching frequency topology 280 100%<->10% load Vin_min to Vin_max at no load internal IC junction -40°C ~ 85°C ambient typ. ±2 ±0.2 ±0.4 20 max. ±3 ±0.4 ±0.6 35 unit % % % mVp-p 0.5 1.2 2000 450 ±100 7 0.02 2000 W mA KHz mV mA °C %/°C μF max. 85 100 125 unit °C °C °C 330 5 150 GENERAL SPECIFICATIONS item operating temperature range operating case temperature storage temperature range cooling solderability storage humidity range case material case thermal impedance MTBF package weight conditions see derating curve free air convection 1.5 mm from case for 10 seconds relative humidity, non-condensing plastic (UL94-V0) min. -40 -40 -55 typ. 300 95 10 50 at 25°C per MIL-HDBK-217F 2,000,000 3.7 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 °C % °C/W hours grams rev. page 2 of 4 date 04/2008 DESCRIPTION: DC switching regulator, non-isolated PART NUMBER: V78XX-1000 series MECHANICAL DRAWINGS 11.50 0.453 8.90 0.350 Recommended PCB Layout Pattern 1.00 +0.15/-0 [0.040 +0.006/-0] 17.50 0.689 2.54 [0.100] 1 0.50 0.020 (TYP) 2.54 [0.100] 2 3 Top View 4.10 (3 PLCS) 0.50 0.020 (3 PLCS) 1 2 3 PIN 1 2 3 2.54 0.100 (2 plcs) 2.15 0.085 (3 PLCS) 1 2 ASSIGNMENTS +Vin GND +Vout 0.30 0.012 (3 PLCS) 3 5.08 0.200 3.21 0.126 units: mm(inches) pin tolerances: ±0.10(±0.004) general tolerances: ±0.25(±0.01) THERMAL DERATING CURVE Temperature Derating Graph Operating Temp.( C ) 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 rev. page 3 of 4 date 04/2008 DESCRIPTION: DC switching regulator, non-isolated PART NUMBER: V78XX-1000 series TYPICAL APPLICATION CIRCUIT Vin 1 V78XX-1000 Vout 3 2 C1 22 μ F/50V C2 100μ F/25V GND INPUT CAPACITOR (C1): A low ESR capacitor is recommended to keep the noise at the converter to a minimum. Ceramic capacitors are preferred but tantalum or low ESR electrolytic capacitors may also suffice. Place C1 as close as possible to pins 1 & 2. OUTPUT CAPACITOR (C2): A 100μF/25V electrolytic capacitor is recommended. NOT FOR PARALLEL OPERATION This converter is not designed for parallel operation with another to increase output power. TEST CIRCUIT FOR EFFICIENCY & RIPPLE GRAPHS (PAGE4) + DC Power Source +Vin Voltage Meter - Electronic Load Current Meter Current Meter Cin +Vout DC/DC Converter GND 30cm, 18AWG A Cout Voltage Meter B 20MHz Oscilloscope Twisted 0V A 1. Cin = 10μF / 50V for 500mA and 22μF / 50V for 1A, Cout = 100μF / 16V. 2. C01 = 10μF / 50V Electrolytic, C02 = 0.1μF / 50V Ceramic. 3. All points labeled A refer to one junction. 4. All points labeled B refer to one junction. 5. Use a short ground loop for probing. Do not use a wired ground clip. + A C01 + C02 B B - A B 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 rev. page 4 of 4 date 04/2008 DESCRIPTION: DC switching regulator, non-isolated PART NUMBER: V78XX-1000 series EFFICIENCY AND RIPPLE Output Ripple Efficiency 50 90 V7803-1000 V7805-1000 80 V7812-1000 Ripple (mVpp) Efficiency (%) 100 70 40 30 V7803-1000 V7805-1000 20 V7812-1000 10 0 60 4.75 8 12 16 20 24 28 Efficiency VS Vin(Full Load) 4.75 32 Vin(V) 8 12 16 20 24 28 32 Vin (V) Ripple vs. Vin ( Full Load) 100 50 45 V7803-1000 90 V7805-1000 V7812-1000 85 Ripple (mVpp) Efficiency (%) 95 40 35 V7803-1000 30 V7805-1000 25 V7812-1000 20 15 80 10 5 75 0 40 80 200 400 600 800 1000 1200 40 80 Efficiency (%) 100 50 90 45 40 70 400 600 800 1000 1200 Output Current (mA) Ripple vs. Load (Vin=Vin_min) Output Current(mA) Efficiency vs. Load (Vin=Vin_min) 80 200 V7803-1000 35 V7803-1000 V7805-1000 30 25 V7805-1000 V7812-1000 V7812-1000 20 60 15 50 10 5 40 40 80 200 400 600 800 1000 1200 Output Current (mA) Efficiency vs. Load (Vin=Vin_max) 0 40 80 200 400 600 800 1000 1200 Output Current (mA) Ripple vs. Load (Vin=24V) 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382