1.5A Low Dropout Voltage Regulator Adjustable & Fixed Output Fast Response CORPORATION CLM2815 FEATURES • • • • • • • • PRODUCT DESCRIPTION Adjustable Output . . . . . . . . . . . . . . . . . . . Down To 1.2V Fixed Output Voltages. . . . . . . . . . . . . . 1.5, 2.5, 3.3, 5.0V Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5A Low Dropout Voltage. . . . . . . . . . . . . . . . . . . . . 1.1V Typ. Extremely Tight Load And Line Regulation Current & Thermal Limiting Standard 3-Terminal Low Cost TO-220, TO-263 & TO-252 Similar To Industry Standard LT1086/LT1586 APPLICATIONS • • • • • • • • • Powering VGA & Sound Card Power PC Supplies SMPS Post-Regulator High Efficiency "Green" Computer Systems High Efficiency Linear Power Supplies Portable Instrumentation Constant Current Regulators Adjustable Power Supplies Battery charger Calogic’s CLM2815 is a low power 1.5A adjustable and fixed voltage regulator. The device requires 2 external resistors to set the output for the adjustable version. The CLM2815 has been designed for low voltage applications that require lower dropout and faster transient responses. The device is well suited to power a low voltage microprocessor that requires a low dropout and a fast transient response to regulate from +2.85V to 3.8V. The device is adjustable to 1.2 volts. The product family offers full protection against over-current faults, reversed input polarity, reversed load insertion, and positive and negative transient voltage. On-chip trimming adjusts the reference voltage to 1% while delivering 1.5A output current. Encapsulated in a 3-pin TO-220, TO-263 & TO-252 packages. ORDERING INFORMATION Part Package Temperature Range CLM2815AU CLM2815AAU CLM2815AU-X CLM2815AAU-X CLM2815AT CLM2815AAT CLM2815AT-X CLM2815AAT-X TO-220 TO-220 TO-220 TO-220 TO-263 (DD) TO-263 (DD) TO-263 (DD) TO-263 (DD) -45 to +125oC -45 to +125oC -45 to +125oC -45 to +125oC -45 to +125oC -45 to +125oC -45 to +125oC -45 to +125oC PIN CONNECTIONS 3 VIN 2 VOUT 1 VADJ/GND PLASTIC TO-220 PACKAGE VIN CLM2815 CLM2815 PLASTIC TO-263 PACKAGE VOUT VADJ/GND FRONT VIEW FRONT VIEW 1E-30A 1E-29A CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CLM2815 CORPORATION ABSOLUTE MAXIMUM RATINGS Lead Temp. (Soldering, 10 Seconds) . . . . . . . . . . . . . . 300oC Storage Temperature Range . . . . . . . . . . . . -65oC to +150oC Operating Junction Temperature Range CLM2815 Control Section . . . . . . . . . . . . . . -45oC +125oC CLM2815 Power Transistor . . . . . . . . . . . . . . -45oC +150oC Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10V Input to Output Voltage Differential . . . . . . . . . . . . . . . . . . 10V Maximum Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . 2A ELECTRICAL CHARACTERISTICS (Note 1) at IOUT = 10mA, TA = 25oC, unless otherwise specified. PARAMETER TYP CLM2815A CLM2815 UNITS CONDITIONS MIN MAX MIN MAX 1.5 1.5 1.485 1.470 1.515 1.530 1.470 1.455 1.530 1.545 V CLM2815-1.5V, 0 ≤ IOUT ≤ 1.5A, 2.75V ≤ VIN ≤ 7V 2.5 2.5 2.475 2.450 2.525 2.550 2.450 2.425 2.550 2.575 V CLM2815-2.5V, 0 ≤ IOUT ≤ 1.5A, 3.5V ≤ VIN ≤ 7V 3.3 3.3 3.270 3.240 3.330 3.360 3.230 3.201 3.370 3.399 V CLM2815-3.3V, 0 ≤ IOUT ≤ 1.5A, 4.75V ≤ VIN ≤ 7V 5.0 5.0 4.95 4.90 5.05 5.10 4.900 4.850 5.100 5.150 V CLM2815-5.0V, 0 ≤ IOUT ≤ 1.5A, 5.5V ≤ VIN ≤ 7V 1.250 1.225 1.270 1.225 1.270 V VIN ≤ 7V, P ≤ PMAX 1.5V ≤ (VIN - VOUT ) ≤ 5.75V, 10mA ≤ I OUT ≤ IOUT ≤ 5.75 mA 1.5V VERSION Output Voltage (Note 2) 2.5V VERSION Output Voltage (Note 2) 3.3V VERSION Output Voltage (Note 2) 5.0V VERSION Output Voltage (Note 2) ALL VOLTAGE OPTIONS Reference Voltage (VREF) Min. Load Current (Note 3) 5 10 10 0.005 0.2 0.2 0.005 0.2 0.2 Load Regulation (∆VREF (IOUT)) 0.05 0.3 0.3 0.05 0.3 0.3 Dropout Voltage 1.1 1.2 1.2 Current Limit (IOUT(MAX)) 2.5 Line Regulation (∆VREF (IIN)) 1.7 % % 1.7 1.5V ≤ (VIN - VOUT ) ≤ 5.75V 2.75V ≤ VIN ≤ 7V, IOUT = 10mA, TJ = 125oC (Note 3) VIN ≤ 7V, I OUT = 0mA, TJ = 125oC (Note 2) 10mA ≤ IOUT ≤ 1.5A, (VIN - VOUT ) = 3V, TJ = 25oC 0 ≤ IOUT ≤ 1.5A, VIN = 7V, T J = 125oC (Note 2) V ∆VREF = 1%, IOUT = 1.5A (Note 3), IOUT ≤ 1.5A (Note 2) A VIN = 7V ≤ 1.5A 1.4V ≤ (VIN - VOUT ) (Note 3) Long Term Stability 0.3 (Note 2) 1 1 % TA = 125 oC, 1000 Hrs. Thermal Regulation (∆VOUT (PWR)) 0.01 0.020 0.020 %/W TA = 25oC, 20ms pulse Temperature Stability (∆VOUT (T)) 0.25 % Output Noise, RMS 0.003 %VO Thermal Resistance 3.0 60 3.0 60 3.0 60 3.0 60 3.0 60 3.0 60 10Hz to 10kHz, TA = 25oC TO-220 o C/W DD Package Junction to Tab Junction to Ambient Junction to Tab Junction to Ambient The Bold specifications apply to the over full operating temperature range. Note 1: Changes in output voltage due to heating effects are covered under the specification for thermal regulation. Note 2: Fixed version only. Note 3: Adustable version only. CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CLM2815 CORPORATION APPLICATION HINTS The Calogic Semiconductor CLM2815 incorporates protection against over-current faults, reversed load insertion, over temperature operation, and positive and negative transient voltage. However, the use of an output capacitor is required in order to insure the stability and the performances. Stability The output capacitor is part of the regulator’s frequency compensation system. Either a 220µF aluminum electrolytic capacitor or a 47µF solid tantalum capacitor between the output terminal and ground guarantees stable operation for all operating conditions. However, in order to minimize overshoot and undershoot, and therefore optimize the design, please refer to the section ’Ripple Rejection’. Ripple Rejection Ripple rejection can be improved by adding a capacitor between the ADJ pin and ground. When ADJ pin bypassing is used, the value of the output capacitor required increases to its maximum (220µF for an aluminum electrolytic capacitor, or 47µF for a solid tantalum capacitor). If the ADJ pin is not bypass, the value of the output capacitor can be lowered to 100µF for an electrolytic aluminum capacitor or 15µF for a solid tantalum capacitor. However the value of the ADJ-bypass capacitor should be chosen with respect to the following equation: C = 1 / ( 6.28 • FR • R1 ) Where C = value of the capacitor in Farads (select an equal or larger standard value), Reducing parasitic resistance and inductance One solution to minimize parasitic resistance and inductance is to connect in parallel capacitors. This arrangement will improve the transient response of the power supply if your system requires rapidly changing current load condition. Thermal Consideration Although the CLM2815 offers some limiting circuitry for overload conditions, it is necessary not to exceed the maximum junction temperature, and therefore to be careful about thermal resistance. The heat flow will follow the lowest resistance path, which is the Junction-to-case thermal resistance. In order to insure the best thermal flow of the component, a proper mounting is required. Note that the case of the device is electrically connected to the output. In case the case has to be electrically isolated, a thermally conductive spacer can be used. However do not forget to consider its contribution to thermal resistance. Assuming: VIN = 10V, VOUT = 5V, IOUT = 1.5A, TA = 90oC, ΘCASE = 1oC/W (no external heat sink, no wind) Power dissipation under these conditions PD = (VIN - VOUT) • IOUT = 7.5W Junction Temperature TJ = TA + PD • (ΘCASE + ΘJC) For the Control Section TJ = 90oC + 7.5W • (1oC/W + 0.6oC/W) = 102oC 114oC TJUNCTION MAX for the control section. FR = ripple frequency in Hz, R1 = value of resistor R1 in Ohms. If an ADJ-bypass capacitor is used, the amplitude of the output ripple will be independent of the output voltage. If an ADJ-bypass capacitor is not used, the output ripple will be proportional to the ratio of the output voltage to the reference voltage: For the Power Section TJ = 90oC + 7.5W • (1oC/W + 1.6oC/W) = 104.5oC 109.5oC TJUNCTION MAX for the power transistor. In both cases reliable operation is insured by adequate junction temperature. M = VOUT / VREF Where M = multiplier for the ripple seen when the ADJ pin is optimally bypassed. VREF = Reference Voltage CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CLM2815 CORPORATION FIGURE 2. BASIC ADJUSTABLE REGULATOR FIGURE 3. BASIC ADJUSTABLE REGULATOR R P PARASITIC LINE RESISTANCE VOUT VOUT CLM2815 VREF VOUT CLM2815 CONNECT R 1 TO CASE OF REGULATOR R1 R1 I ADJ 50 mA RL R2 R2 VOUT = VREF (1 + R1 /R2 ) + IADJ R2 1U-23 CONNECT R 2 TO LOAD 1U-24 Output Voltage Load Regulation Consider Figure 2. The resistance R1 generates a constant current flow, normally the specified load current of 10mA. This current will go through the resistance R2 to set the overall output voltage. The current IADJ is very small and constant. Therefore its contribution to the overall output voltage is very small and can generally be ignored. Parasitic line resistance can degrade load regulation. In order not to affect the behavior of the regulator, it is best to connect directly the R1 resistance from the resistor divider to the case, and not to the load. For the same reason, it is best to connect the resistor R2 to the Negative side of the load. CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CLM2815 CORPORATION TYPICAL APPLICATIONS VIN IN C1 CLM2815 VIN OUT R1 ADJ C1 LOAD 1.5A CURRENT OUTPUT REGULATOR CLM2815 IN ADJ VOUT = VREF (1 + R1 /R 2 ) + IADJ R 2 TYPICAL ADJUSTABLE REGULATOR 1E-37 5V VIN (NOTE A) IN CLM2815 R1 C2 R2 1E-38 VOUT OUT R1 121 W 1% + ADJ 10mF VOUT OUT 150mF *C1 IMPROVES RIPPLE REJECTION. X C SHOULD BE - R 1 AT RIPPLE FREQUENCY. R2 365 W 1% + C1 10m F NOTE A: VIN (MIN) = (INTENDED V OUT ) + (V DROPOUT (MAX) ) 1U-25 IMPROVING RIPPLE REJECTION VIN (NOTE A) IN CLM2815 + ADJ 10mF 5V OUT 121 W 1% + 1k 2N3904 TTL OUTPUT 1k 100mF 365 W 1% NOTE A: VIN (MIN) = (INTENDED V OUT ) + (V DROPOUT (MAX)) 1U-26 5V REGULATOR WITH SHUTDOWN CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CLM2815 CORPORATION DROPOUT VOLTAGE 2 1 TJ = –55˚C TJ = 25˚C TJ = 150˚C 0 2 3 4 5 6 7 8 OUTPUT CURRENT (A) 1 9 10 8 150˚C 6 –55˚C 4 IFULL LOAD 0 ADJUSTMENT PIN CURRENT (µA) 100 –0.05 –0.10 –0.15 9 8 7 6 90 80 70 60 50 40 30 20 10 0 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (˚C) 1E-33 TJ = 150˚C 5 4 TJ = 25˚C 3 2 TJ = –55˚C 1 0 0 ADJUSTMENT PIN CURRENT 0 25 50 75 100 125 150 TEMPERATURE (˚C) 1E-31A MINIMUM OPERATING CURRENT 10 5 10 15 20 25 30 35 INPUT/OUTPUT DIFFERENTIAL (V) 1E-32A 1.270 OUTPUT VOLTAGE CHANGE (%) 0 0 1U-27 25˚C 2 0.05 –0.20 –50 –25 10 SHORT CIRCUIT CURRENT 12 SHORT CIRCUIT CURRENT (A) OUTPUT VOLTAGE DEVIATION (%) –40˚C T J 150˚C 0˚C TJ 120˚C 0 LOAD REGULATION 0.10 INDICATES GUARANTEED TEST POINT MINIMUM OPERATING CURRENT (mA) MINIMUM INPUT/OUTPUT DIFFERENTIAL (V) TYPICAL PERFORMANCE CHARACTERISTICS 5 10 15 20 25 30 35 INPUT/OUTPUT DIFFERENTIAL (V) 1U-28 TEMPERATURE STABILITY 1.260 1.250 1.240 1.230 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (˚C) 1U-29 Information furnished by Calogic is believed to be accurate and reliable. However, no responsibility is assumed for its use: nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent rights of Calogic. CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025