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L M 3 5 September 2014 0 — 3 - T e r LM350 m i n 3-Terminal 3 A Positive Adjustable Regulator a l 3 A P o s Features Description it i v • Output Adjustable Between 1.2 V and 33 V The LM350 is an adjustable 3-terminal positive voltage e • Guaranteed 3 A Output Current regulator capable of supplying in excess of 3.0 A over an A d • Internal Thermal Overload Protection output voltage range of 1.2 V to 33 V. ju s • Load Regulation (Typical: 0.1%) TO-220(Single Gauge) ta • Line Regulation (Typical: 0.015%/V) b l • Internal Short-Circuit Current Limit e R • Output Transistor Safe-Area Compensation e g u 1 l a 1. Adj 2. Output 3. Input to r Ordering Information Product Number Marking Package Packing Method Operating Temperature LM350T LM350 TO-220 3L (Single Gauge) Rail 0 to +125°C © 2002 Fairchild Semiconductor Corporation www.fairchildsemi.com LM350 Rev. 1.1.0

L M Block Diagram 3 5 0 — 3 - T 3 e INPUT r m i n a l 3 + A Q P VREF _ 1 o Q s VOLTAGE 0 it REFERENCE iv e PROTECTION A CIRCUITRY d RSC ju s t a b 2 le OUTPUT R ADJUSTABLE e g 1 u l a t Figure 1. Block Diagram o r Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera- ble above the recommended operating conditions and stressing the parts to these levels is not recommended. In addi- tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Values are at T = 25°C unless otherwise noted. A Symbol Parameter Value Unit V - V Input-Output Voltage Differential 35 V I O T Lead Temperature (Soldering, 10 sec) 300 °C LEAD T Operating Temperature Range 0 to +125 °C OPR T Storage Temperature Range -65 to +150 °C STG Thermal Characteristics Values are at T = 25°C unless otherwise noted. A Symbol Parameter Value Unit P Power Dissipation Internally Limited W D © 2002 Fairchild Semiconductor Corporation www.fairchildsemi.com LM350 Rev. 1.1.0 2

L M Electrical Characteristics 3 5 VI - VO = 5 V, IO = 1.5 A, 0°C ≤ TJ ≤ +125°C, PD ≤ PDMAX, unless otherwise specified. 0 — Symbol Parameter Conditions Min. Typ. Max. Unit 3 - Rline Line Regulation(1) T = +25°C, 3 V ≤ V - V ≤ 35 V 0.015 0.030 %/V T A I O e T = +25°C, 3 V ≤ V - V ≤ 35 V, rm A I O 5 25 mV V ≤ 5V i Rload Load Regulation(1) O n TA = +25°C, 3 V ≤ VI - VO ≤ 35 V, 0.1 0.5 % al V ≥ 5V 3 O A IADJ Adjustment Pin Current - 50 100 μA P 3 V ≤ V - V ≤ 35 V, o ΔI Adjustment Pin Current Change I O 0.2 5.0 μA s ADJ 10 mA ≤ IO ≤ 3 A, PD ≤ PMAX it i REG Thermal Regulation Pulse = 20 ms, T = +25°C 0.002 %/W v T A e 3 V ≤ V - V ≤ 35 V, A VREF Reference Voltage 10 mA ≤I I O≤ 3 A, P ≤ 30 W 1.20 1.25 1.30 V d O D j u Rline Line Regulation 3.0 V ≤ V - V ≤ 35 V 0.02 0.07 %/W s I O t a 10 mA ≤ IO ≤ 3.0 A, VO ≤ 5.0 V 20 70 mV b Rload Load Regulation l 10 mA ≤ I ≤ 3.0 A, V ≥ 5.0 V 0.3 1.5 % e O O R ST Temperature Stability T = 0°C to +125°C 1.0 % e T J g V - V ≤ 10 V, P ≤ P 3.0 4.5 u I O D MAX l IO(MAX) Maximum Output Current VI - VO = 30 V, PD ≤ PMAX, 0.25 1.0 A ato TA = +25°C r I Minimum Load Current V - V = 35 V 3.5 10 mA L(MIN) I O V RMS Noise, %of V 10 Hz ≤ f ≤ 10 kHz, T = +25°C 0.003 %/V N OUT A o V = 10 V, f = 120 Hz, C = 0 65 O ADJ RR Ripple Rejection V = 10 V, f = 120 Hz, dB O 66 80 C = 10 μF ADJ %/ ST Long-Term Stability T = +125°C 0.3 1 J 1000HR Note: 1. Regulation is measured at constant junction temperature. Changes in output voltage due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used. © 2002 Fairchild Semiconductor Corporation www.fairchildsemi.com LM350 Rev. 1.1.0 3

L M Typical Performance Characteristics 3 5 0 — 3 - T e r m i n a l 3 A P o s i t i v e A d j u s Figure 2. Load Regulation Figure 3. Current Limit ta b l e R e g u l a t o r Figure 4. Adjustment Pin Current Figure 5. Dropout Voltage Figure 6. Temperature Stability Figure 7. Minimum Load Current © 2002 Fairchild Semiconductor Corporation www.fairchildsemi.com LM350 Rev. 1.1.0 4

L M Typical Performance Characteristics (Continued) 3 5 0 — 3 - T e r m i n a l 3 A P o s i t i v e A d j u s Figure 8. Ripple Rejection vs. VO Figure 9. Ripple Rejection vs. IO ta b l e R e g u l a t o r Figure 10. Ripple Rejection vs Frequency Figure 11. Output Impedan Figure 12. Line Transient Response Figure 13. Load Transient Response © 2002 Fairchild Semiconductor Corporation www.fairchildsemi.com LM350 Rev. 1.1.0 5

L M Typical Application(2) 3 5 0 — 3 LM350 -T IN OUT e r Input I1 Output m ADJ i n R a I 1 l ADJ 120 3 CI CO A 0.1uF 1uF P o s i t i R v 2 e A d j u s Figure 14. ta b Note: l e 2. C: C is required if the regulator is located an appreciable distance from power supply filter. I I R C : Output capacitors in the range of 1 μF to 100 μF of aluminum or tantalum electronic are commonly used to e O g provide improved output impedance and rejection of transients. u l a t o In operation, the LM350 develops a nominal 1.25 V reference voltage, VREF, between the output and adjustment r terminal. The reference voltage is impressed across program resistor R and, since the voltage is constant, a 1 constant current I then flows through the output set resistor R , giving an output voltage of 1 2 V = 1.25 V(1+R /R ) + I R O 2 1 ADJ 2 Since I current (less than 100 mA) from the adjustment terminal represents an error term, the LM350 was ADJ designed to minimize I and make it very constant with line and load changes. To do this, all quiescent operating ADJ current is returned to the output establishing a minimum load current requirement. If there is insufficient load on the output, the output voltage will rise. Since the LM350 is a floating regulator, it is only the voltage differential across the circuit which is important to performance, and operation at high voltage with respect to ground is possible. Since I is controlled to less than 100 mA, the error associated with this term is negligible in most applications. ADJ © 2002 Fairchild Semiconductor Corporation www.fairchildsemi.com LM350 Rev. 1.1.0 6

L M Physical Dimensions 3 5 0 — 3 - T e r m i n a l 3 A P o s i t i v e A d j u s t a b l e R e g u l a t o r Figure 15. TO-220, MOLDED, 3LEAD, JEDEC VARIATION AB © 2002 Fairchild Semiconductor Corporation www.fairchildsemi.com LM350 Rev. 1.1.0 7

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