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| MICROELECTRONICS A A Power Management GM317 3- TERMINAL ADJUSTABLE REGULATOR Features Output current up to 1.5A Output Voltages 1.2V to 37V Input Regulation typ. 0.01% per input Output Regulation typ. 0.1% Peak Output Current Constant over Temperature Range of Regulator Available in TO-220 and TO-263 Packages Ripple Rejection Typically 80dB Direct replacements for LM317 Description The GM317 is an adjustable 3-terminal positive voltage regulator capable of supplying in excess of 1.5 A over an output voltage range of 1.2 V to 37 V. This voltage regulator is exceptionally easy to use and requires only two external resistors to set the output voltage. Further, it employs internal current limiting, thermal shutdown and safe area compensation, making it essentially blow-out proof. The GM317 a wide variety of applications including local, application, and on card regulation. This device can also be used to make a programmable output regulator, or by connecting a fixed resistor between the adjustment and output. The GM317 can be used as a precise current regulator. TYPICAL APPLICATION VIN GM317 VIN ADJ VOUT VOUT R1 240W + C ** O 1F CIN* 0.1F IADJ R2 VOUT= 1.25V (1+ R2 ) + IADJR2 R1 Since IADJ is controlled to less than 100A, the error associated with this term is negligible in most applications. www.gammamicro.com PRELIMINARY GM317 V0.1 1 * CIN is required if regulator is located an appreciable distance from power supply filter. **CO is not needed for stability, however, it improve transient response. MICROELECTRONICS A A Power Management GM317 3- TERMINAL ADJUSTABLE REGULATOR MARKING INFORMATION & PIN CONFIGURATIONS TO-263-2 (D PAK) 2 TO-220 GM317 AYWW GM317 AYWW ADJ OUTPUT INPUT ADJ OUTPUT INPUT A : Assembly Location Y : Year W W : weekly ORDERING INFORMATION Ordering Number GM317TA3T GM317TA3R GM317TB3T Package TO-263 TO-263 TO-220 Shipping 50 Units / Tube 800 Units / Tape & Reel 50 Units / Tube * For detail Ordering Number identification, please see last page. GM317 2 MICROELECTRONICS A A Power Management GM317 3- TERMINAL ADJUSTABLE REGULATOR ABSOLUTE MAXIMUM RATINGS PARAMETER Input to Output Differential Voltage, VI - VO Continuous Total Dissipation at 25C free-air temperature Continuous Total Dissipation at (or bellow) 25C case temperature Operating free-air, case, or virtual junction Temperature Range Storage Temperature Range Lead Temperature 1.6mm (1/16 inch) from case for 10 sec. VALUE 40 2 UNIT V W 15 0 to +125 -65 to +150 260 C RECOMMENDED OPERATING CONDITIONS PARAMETER Output Current, IO Operating virtual junction temperature, TJ MIN 10 0 MAX 1500 125 UNIT mA C SCHEMATIC DIAGRAM VIN 31 310 230 120 5.6K 6.3V 170 125K 135 12.4K 6.7K 5pF 510 6.8K 5.1K 6.3V 190 3.6K 5.8K 110 30 pF 30 pF 2.4K 12.5K VOUT 12K 160 200 105 4.0 13K 6.3V ADJ This device contains 29 active transistors. GM317 3 MICROELECTRONICS A A Power Management GM317 3- TERMINAL ADJUSTABLE REGULATOR ELECTRICAL CHARACTERISTICS over recommended ranges of operating virtual junction temperature, unless otherwise noted. PARAMETER Input Regulation (Note 2) TEST CONDITIONS* VI - VO= 3V to 40V TJ= MIN to MAX (Note 3) IO= 10mA to 1.5A VO= 10V, f= 120H VO= 10V, f= 120H, 10F capacitor between ADJ and ground IO= 10mA to 1.5A TJ= 25C (Note 3) IO= 10mA to 1.5A (Note 3) VO 5V Min Typ 0.01 0.02 65 Max 0.04 Unit %/ V 0.07 Ripple Rejection dB 66 80 5 0.1 20 0.3 1 0.3 0.003 3.5 50 10 100 5.0 1.3 1 25 0.5 70 1.5 mV % mV % % % % mA A A V Output Regulation VO >5V VO 5V VO >5V Output Voltage Change with Temperature TJ= MIN to MAX Output Voltage Long-Term Drift (Note 4) Output Noise Voltage Minimum Output Current to maintain Regulation Adjustment-Termainal Current Adjustment-Termainal Current Change Reference Voltage (Output to ADJ) VI - VO= 2.5V to 40V, IO= 10mA to 1.5A VI - VO= 3V to 40V, IO= 10mA to 1.5A, P VI - VO VI - VO 15V 40V, TJ= 25C 15W 1.2 1.5 0.15 After 1000h at TJ= MAX and VI - VO= 40V f= 10Hz to 10kHz, TJ= 25C VI - VO= 40V 0.2 1.25 2.2 Peak Output Current A 0.4 * Unless otherwise noted, these specifications apply for the following test conditions: VI - VO = 5V and IO= 0.5A. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. Note 1: All characteristics are measured with a 0.1F capacitor across the input and a 1F capacitor across the output. Note 2: Input regulation is expressed here as the percentage change in output voltage per 1V change at the input. Note 3: Pulse testing techniques are used to mantain the junction temperature as close to the ambient temperature as possible. Thermal effects must be taken into account separately. Note 4: Since long-term drift cannot be measured on the individual devices prior to shipment, this specification is not intended to be a guarantee or warranty. It is an engineering estimate of the average drift to be expected from lot to lot. GM317 4 MICROELECTRONICS A A Power Management GM317 3- TERMINAL ADJUSTABLE REGULATOR Typical Performance Characteristics 4.0 DVOUT, Output Voltage Change (%) 0.4 Adjustment Pin Current (A) 40 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 IOUT, Output Current (A) 3.0 100 90 80 70 60 50 40 30 20 10 0 0 10 20 30 VIN - VOUT, Input - Output Voltage Differential(Vdc) 0 0 25 50 72 100 125 IL= 0.5A TJ= 25C 2.0 IL= 1.5A VIN= 15V VOUT= 10V -50 -25 0 25 50 75 100 125 150 TJ, Junction Temperature (C) 150C 1.0 -55C Ambient Temperature (C) Figure 1. Load Regulation Figure 2. Current Limit Figure 3. Adjustment Pin Current vs. Temperature 3.0 DVOUT= 100mV IB, Quiescent Current (mA) IL= 1.5A 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 100 2.5 RR, Ripple Rejection (dB) TJ= -55C CADJ= 10A 80 VIN - VOUT, Input - Output Voltage Differential (Vdc) 60 Without CADJ 2.0 1.0A 500mA 25C 150C 40 1.5 200mA 20mA 1.0 -50 -25 0 25 50 75 100 125 150 TJ, Junction Temperature (C) VIN - VOUT= 5V 20 IL= 500mA 0 f= 120Hz TJ= 25C 5.0 10 15 20 25 30 35 40 VOUT, Output Voltage (V) 0 Figure 4. Dropout Voltage 10 20 30 40 VIN - VOUT, Input - Output Voltage Differential (Vdc) 0 Figure 5. Minimum Operating Current Figure 6. Ripple Rejection versus Output Voltage 100 RR, Ripple Rejection (dB) 80 60 IL= 500mA VIN= 15V VOUT= 10V TJ= 25C 40 20 0 10 CADJ= 10F Without CADJ 100 1.0k 10k 100k 1.0M 10M f, Frequency (Hz) Figure 7. Ripple Rejection Versus Frequency GM317 5 MICROELECTRONICS A A Power Management GM317 3- TERMINAL ADJUSTABLE REGULATOR APPLICATION INFORMATION Basic Circuit Operation The GM317 is a 3- terminal floating regulator. In operation, the GM317 develops and maintains a nominal 1.25V reference (Vref) between its output and adjustment terminals. This reference voltage is converted to a programming current flows through R2 to ground. The regulated output voltage is given by: R2 VOUT= Vref (1+ ) + IADJ R2 R1 External Capacitors A 0.1F disc or 1.0F tantalum input bypass capacitor (CIN) is recommended to reduce the sensitivity to input line impedance. The adjustment terminal may be bypassed to ground to improve ripple rejection. This capacitor (CADJ) prevents ripple from being amplified as the output voltage is increased. A 10F capacitor should improve ripple rejection about 15 dB at 120Hz in a 10V application. Although the GM317 is stable with no output capacitance, like any feedback circuit, certain values of external capacitance can cause excessive ringing. An output capacitance (CO) in the form of a 1.0F tantalum or 25F aluminum electrolytic capacitor on the output swamps this effect and insures stability. Protection Diodes When external capacitors are used with any IC regulator it is sometimes necessary to add protection diodes to prevent the capacitors from discharging through low current points into the regulator. Since the current from the adjustment terminal (IADJ) represents an error term in the equation, the GM317 was designed to control IADJ to less than 100A and keep it constant. To do this, all quiescent operating current is returned to the output terminal. This imposes the requirement for a minimum load current. If the load current is less than this minimum, the output voltage will rise. Since the GM317 is a floating regulator, it is only the voltage differential across the circuit which is important to performance, and operation at high voltages with respect to ground is possible. VIN VOUT VOUT GM317 Figure 9. shows the GM317 with the recommended protection diodes for output for output voltage in excess of 25Vor high capacitance values (CO > 25F, CADJ > 10F). Diode D1 prevents CO from discharging thru the IC during an input short circuit. Diode D2 protects against capacitor CADJ discharging through the IC during an output short circuit. The combination of diodes D1 and D2 prevents CADJ from discharging through the IC during an input short circuit. D1 1N4002 VIN GM317 VOUT R1 D2 + C O 1N4002 Vref Adjust R1 IPROG IADJ R2 VOUT Vref= 1.25V Typical Figure 8. Basic Circuit Configuration Load Regulation The GM317 is capable of providing extremely good load regulation, but a few precautions are needed to obtain maximum performance. For best performance, the programming resistor (R1) should be connected as close to the regulator as possible to minimize line drops which effectively appear in series with the reference, thereby degrading regulation. The groung end of R2 can be returned near the load ground to provide remote ground sensing and improve load regulation. GM317 CIN Adjust R2 CADJ 6 Figure 9. Voltage Regulator with Protection Diodes MICROELECTRONICS A A Power Management GM317 3- TERMINAL ADJUSTABLE REGULATOR TO-263-2 PACKAGE OUTLINE DIMENSIONS 9.90 0.20 0.40 15 1.20 3 1.50 DP0.20 9.20 0.20 4.50 0.20 1.30 -0.05 +0.1 Pad Layout 0.63 17.02 0.33 8.38 0.10 0.01 3 R0.30 2.40 0.20 2.54 0.10 0.50 -0.05 10.0 0.20 7.0 4.0 0.04 1.016 +0.1 0.12 3.05 15.3 0.20 1.4 0.20 1.27 0.10 2.54 TYP (2.54 0.20) 3 R 0.3 P 4.90 0.20 0.90 0.10 0.40 3 0.90 8.70 3.70 0.20 15.90 0.20 4.60 18.95 MAX 8.40 45 3.00 10.08 0.30 0.80 0.10 1.52 0.10 3 2.00 0.10 0.42 10.66 0.24 6.096 0.75 R0.30 ( Inches ) mm R 0.45 7.2 9.20 0.20 10.00 0.20 4.90 0.20 Unit: mm TO-220-3 PACKAGE OUTLINE DIMENSIONS 9.90 0.20 3.60 0.20 1.30 0.10 1.70 1.50 DP0.20 9.20 0.20 2.80 0.10 4.50 0.20 8.0 +0.1 1.30 -0.05 7.0 1.46 1.00 13.08 0.20 1.27 0.10 0.50 -0.05 +0.1 2.54 TYP (2.54 0.20) 2.40 0.20 3 3 2 - R 0.3 Unit: mm 10.00 0.20 GM317 7 P 3 3 3-R0.2 0.9 7.0 3 MICROELECTRONICS A A Power Management GM317 3- TERMINAL ADJUSTABLE REGULATOR ORDERING NUMBER GM 317 TA3 T Gamma Micro. Circuit Type Shipping R: Tape & Reel T: Tube Package TA3: TO-263 TB3: TO-220 GM317 8 |
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