BA51W12

BA51W12SAT ROHM

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Dual output voltage regulator with power saving BA51W12SAT The BA51W12SAT is a general-purpose, low saturation power supply with two outputs : 9V, 1A and 5V, 500mA. The IC is available in a compact TO220FP-5 package. The outputs can be turned off during the power saving state with the built-in switch. Also built in the IC is an overcurrent protection circuit, an overvoltage protection circuit, and a thermal shutdown circuit. !!!!Applications Car audio systems, VCRs, facsimiles, air conditioners, and other household and industrial equipment !!!!Features 1) Minimum I / O voltage differential is 0.5V or less. 2) Built-in protection circuits against overcurrent, over voltage, and overheat. 3) Available in a compact TO220FP-5 package (pins are bendable). 4) Zero power saving current. (Typ.) !!!!Absolute maximum ratings (Ta=25°C) Parameter Symbol Limits Unit Power supply voltage VCC 35 V Power dissipation Pd 2000∗1 mW Operating temperature Topr −40~+85 °C Peak applied voltage VCCPeak 50 ∗2 V Storage temperature Tstg −55~+150 °C ∗1 Reduced by 16mW for each increase in Ta of 1°C over 25°C. ∗2 Applied time is less than 200 ms (tr≥1ms). 50V 35V Max.200ms tr≥1ms !!!!Recommended operating conditions (T a=25°C) Parameter Power supply voltage V CC 10 25 V 14 Symbol Min. Typ. Max. Unit

!!!!Block diagram VCC REFERENCE VOLTAGE CTL GND OUT2 OUT1 !!!!Pin descriptions Pin No.

3 Ground

4 Output2 (5V, 500mA)

2 Power supply

5 ON / OFF switchCTL

OUT1 Output1 (9V, 1A) Function

!!!!Input / output circuits CTL (5pin) GND (3pin) 25k 25k OUT1, 2 VCC (2pin) 1, 4pin 12.4k (1pin) 6k (4pin) GND (3pin) !!!!Electrical characteristics (unless otherwise noted, Ta=25°C, VCC=14.0V) Parameter Symbol Min. IST Ib VO1 ∆VO1 IO1 R.R1 Reg.I1 Reg.L1 IOS1 VO2 ∆VO2 IO2 R.R2 Reg.I2 Reg.L2 IOS2 Vth1 Vth2 IIN 8.55 1.0 4.75 500 2.0 Typ. 3.0 9.0 0.3 100 150 5.0 0.3 100 150 Max. Unit 10 µA 5.0 mA 9.45 V 0.5 V -d B 100 mV 150 mV -m A 5.25 V 0.5 V -m A -d B 100 mV 100 mV -m A 0.8 V - µA Conditions Test circuit Fig.4 Fig.4 Fig.1 Fig.3 Fig.1 Fig.2 Fig.1 Fig.1 Fig.5 Fig.1 Fig.3 Fig.1 Fig.2 Fig.1 Fig.1 Fig.5 Fig.6 Fig.6 Fig.7 Power save supply current Bias current <9V output section> (Output 1) Output voltage 1 Minimum I / O voltage differential 1 Output current capacity 1 Ripple rejection ratio 1 Input stabillty 1 Load regulation 1 Output short-circuit current 1 <5V output section> (Output 2) Output voltage 2 Minimum I / O voltage differential 2 Output current capacity 2 Ripple rejection ratio 2 Input stabillty 2 Load regulation 2 Output short-circuit current 2 <Switch section> ON mode voltage OFF mode voltage Input high level current OFF mode ON mode I O1=500mA IO1=500mA VCC=8.55V IO1=500mA, f=120Hz eIN=1Vrms VCC=10→25V, IO=500mA IO=5mA→1A VCC=25V IO2=350mA IO2=350mA VCC=4.75V IO2=350mA, f=120Hz eIN=1Vrms VCC=6→25V, IO=350mA IO=5mA→500mA VCC=25V Output ACTIVE mode Output OFF mode V th=5V Note) All the characteristic values are measured with a 0.33µF-capacitor connected the input pin and 22µF-capacitor connected to the output pin. Measurements are made by using a plus (tw≤10ms, duty cycle≤5%) in all cases but noise voltage and the ripple rejection ratio. Not designed for radiation resistance.

!!!!Measurement circuits IO1 IO2 22µ 22µ VCC CTL GND OUT2 OUT1 0.33µ VCC V V Fig.1 Circuit for measuring output voltage, input stability, load regulation, and output current capacity VCC=14V, IO1=500mA VCC=14V, IO2=350mA VCC=10→25V, IO1=500mA VCC=6→25V, IO2=350mA VCC=14V, IO1=5mA→1A VCC=14V, IO2=5mA→500mA VCC=14V VCC=14V when measuring output voltage 1 when measuring output voltage 2 when measuring input stability 1 when measuring input stability 2 when measuring load reguration 1 when measuring load reguration 2 when measuring output current capacity 1 when measuring output current capacity 2 22µ 22µ VCC CTL GND OUT2 OUT1 0.33µ 100µ eIN=1Vrms f=120Hz 10Ω5W 350mA 500mA VCC Fig.2 Circuit for measuring ripple rejection ratio VCC=14V, IO1=500mA when meauring the ripple rejection ratio 1 VCC=14V, IO2=350mA when meauring the ripple rejection ratio 2 υ υ

22µ 22µ 0.33µ VCC OUT1 OUT2 GNDCTL VCC V V V V Fig.3 Circuit for measuring minimum I / O voltage difference VCC=8.55V when measuring minimum I / O voltage difference 1 VCC=4.75V when measuring minimum I / O voltage difference 2 0.33µ 22µ 22µ OUT1 OUT2 VCC VCC GNDCTL A Fig.4 Circuit for measuring bias current power supply current VCC=14V, IO=0mA, VCTL=5V when measuring bias current VCC=14V, IO=0mA, VCTL=0V when measuring power save current 0.33µ VCC=25V 22µ OUT1 OUT2GNDCTL VCC 22µ A A Fig.5 Circuit for measuring output short-circuit current

0.33µ 2.0V 0.8V 22µ OUT1 OUT2 GNDCTL VCC 22µ VCC=14V VV Fig.6 Circuit for measuring mode switching voltage OUT1 OUT2 GNDCTL VCC 0.33µ 22µ 22µ VCC=14V A Fig.7 Circuit for measuring input high level current !!!!Application circuit Vcc CTL GND OUTPUT1 OUTPUT2 0.33µ 22µ 22µ Fig.8

!!!!Operation notes (1) Although the circuit examples included in this hand-book are highly recommendable for general use, you should be thoroughly familiar with circuit characteristics as they relate to your own use conditions. If you intend to change the number of external circuits, leave an ample margin, taking into account discrepancies in both static and dynamic characteristics of external parts and Rohm ICs. In addition, please be advised that Rohm cannot provide complete assurance regarding patent rights. (2) Operating power supply voltage When operating within the proper ranges of power supply voltage and ambient temperature, most circuit functions are guaranteed. Although the rated values of electrical characteristics cannot be absolutely guaranteed, characteristic values do not change drastically within the proper rages. (3) Power dissipation (Pd) Refer to the power dissipation characteristics in Fig.12. If power dissipation exceeds the allowable limit, the functionality of the IC will be degraded (such as reduction of current capacity by increased chip temperature). Make sure to use the IC within the allowable range of power dissipation with a sufficient margin. (4) Preventing oscillation at each output and bypass capacitor To stop output oscillation, make sure to connect a capacitor between GND and each output pin (capacitance of at least 10 µF over the whole operating temperature range is recommended). Oscillation can occur if capacitance is susceptible to temperature. We recommended using a tantalum capacitor with minimal changes in capacitance. Also, output can be further stabilized by connecting a bypass capacitor of about 0.33µF between the input pin and GND. Place the capacitor as near as possible to the input pin. (5) Overcurrent protection circuit An overcurrent protection circuit is installed in each output system, based on the respective output current. This prevents IC destruction due to overcurrent, by limiting the current with a curve shape of “7” in the voltage- current graph. The IC is designed with margins so that current flow will be restricted and latching will be prevented even if a large current suddenly flows through a large capacitor. Note that these protection circuits are only good for preventing damage from sudden accidents. Make sure your design does not cause the protection circuit to operate continuously under transitional conditions (for instance, if output is clamped at 1V F or higher, short mode circuit operates at 1VF or lower). Note that the circuit ability is negatively correlated with temperature. (6) Thermal protection circuit A built-in thermal protection circuit prevents thermal damage to the IC. All outputs are turned off when the circuit operates, and revert to the original state when the temperature drops to a certain level. (7) We recommend installing a bypass line with a diode in your application if there is a mode where potential difference between each output and input (V CC) or GND is reversed from the normal state. A reversed mode may cause damage to the IC. (8) Although the quality of this IC is rigorously controlled, the IC may be destroyed when the applied voltage or the operating temperature exceeds their absolute maximum ratings. Because short mode or open mode cannot be specified when the IC is destroyed, be sure to take physical safety measures, such as fusing, if any of the absolute maximum ratings might be exceeded.

(9) Recommended to put diode for protection in case of output pin connected with large load of impedance or reserve current occurred at initial and output off. Output (Example) (10) When used within a strong magnetic field, be aware that there is a slight possibility of malfunction. (11) We are confident in recommending the above application circuit example, but we ask that you carefully check the characteristics of this circuit before using it. If using circuit after modifying other external circuit constants, be careful to ensure adequate margins for variation between external devices and this IC, including not only static characteristics but also transient characteristics. This IC is a bipolar IC which (as shown in Figure 9) has P+ isolation in the P substrate and between the various pins. A P-N junction is formed form this P layer and the N layer of each pin. For example the relation between each potentials is as follows, (When GND > PinB and GND > PinA, the P-N junction operates as a parasitic diode.) (When PinB > GND > PinA, the P-N junction operates as a parasitic transistor.) Parasitic diodes can occur inevitably in the structure of the IC. The operation of parasitic diodes can result in mutual interference among circuits as well as operation faults and physical damage. Accordingly, you must not use methods by which parasitic diodes operate, such as applying a voltage that is lower than the GND (P substrate) voltage to an input pin. (Pin A) (Pin A) Resistance P substrate N GND GND N P N P+ P+ Parasitic diode Parasitic diode (Pin B) Transistor (NPN) P substrate N C B E GND N N P N P+ P+ Parasitic diode or transistor Parasitic diode or transistor GND (Pin B) GND C E B Fig.9 Simplified structure of bipolar IC

!!!!Electrical characteristic curves OUTPUT VOLTAGE : VO (V) OUTPUT CURRENT : IO (mA) 0 500 1000 1500 2000 VCC=14V Ta=25˚C VO2 VO1 Fig.10 Output current capacity characteristics (Typ.) 0 6 12 24 18 36 30 42 54 60 48 OUTPUT VOLTAGE : VO (V) POWER SUPPLY VOLTAGE : VCC (V) Ta=25°C IO=0mA Over voltage protection circuit, ON Vcc=28V(Typ.) VO1 VO2 Fig.11 Output voltage characteristics (Typ.) 0 25 50 100 75 125 150 POWER DISSIPATION : Pd (W) AMBIENT TEMPERATURE : Ta (˚C) (1) With infinte heat sink (2) With Al heat sink 100×100×2 (mm (3) With Al heat sink 50×50×2 (mm2) (4) Without heat sink Note : When using AI heat sink, a tightening torque of 6 (kg cm) and silicon grease is applied (2) (3) (4) Fig.12 Thermal derating characteristics !!!!External dimentions (Units : mm) TO220FP-5 TO220FP-5(V5) 7.0 10.0 2.8 4.5 1.778 0.5 + 0.1 1.2 0.8 1.8 ± 0.28.0 ± 0.2 0.7 1.2 ± 0.2 12.0 ± 0.2 17.013.5Min. 3.2 ± 0.1φ − 0.2 + 0.4 + 0.3 − 0.1 − 0.1 + 0.2+ 0.3 − 0.1 + 0.3 − 0.1 23451 2.85 7.0 10.0 1.778 12345 1.2 0.8 1.8 ± 0.28.0 ± 0.2 12.0 ± 0.2 17.0 31.5Max. 3.2 ± 0.1φ − 0.2 + 0.4 + 0.3 − 0.1 + 0.3 − 0.1 2.8 4.5 0.5 ± 0.1 − 0.1 + 0.2 + 0.3 − 0.1 (2.85) 4.25 (2.0) 23.4 17.5 25.8 8.15