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GM317
3-TERMINAL 1.5A ADJUSTABLE REGULATOR
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. GM317 offers full overload protection. Included on the chip current limit, thermal overload protection, and safe-area protection. Normally, no capacitors is needed unless the device is situated far from the input filter capacitors in which case an input bypass is needed. An optional output capacitor can added to improve transient response.
Features
Output current up to 1.5A Output Voltages 1.2V to 37V Input Regulation typ. 0.01% Output Regulation typ. 0.1% Peak Output Current Constant over Temperature Range of Regulator Available in TO-220, TO-263, TO252 and SOT223 Packages Ripple Rejection Typically 80dB Direct replacements for LM317
Applications
Voltage Regulators Power Supplies Current Regulators Switching Regulators Current Limiter Constant Current Battery Charger Current Limited Charger
Typical Application Circuit
VIN VIN
GM317
ADJ IADJ
VOUT
VOUT R1 240 CO** 1F
CIN* 0.1F
R2
* 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. 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.
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GM317V1.01
GM317
3-TERMINAL 1.5A ADJUSTABLE REGULATOR
Marking Information and Pin Configurations (Top View)
TO 252 (D-PAK) TO 220 TO 263 (D2-PAK) SOT223
GM317 AYWW GM317 AYWW
GM317 AYWW 1. Adj
GM317 AYWW
3. VIN
2. VOUT
Ordering Information
Ordering Number GM317TA3T GM317TA3R GM317TB3T GM317TC3T GM317TC3R GM317ST3T GM317ST3R Adj VOUT Package TO-263 TO-263 TO-220 TO-252 TO-252 SOT-223 SOT-223 Shipping 50 Units/Tube 800 Units / Tape & Reel 50 Units/Tube 80 Units/Tube 2,500 Units / Tape & Reel 80 Units/Tube 2,500 Units / Tape & Reel
1. Adj
A: Assembly / Test site code Y: Year WW: Week
2. VOUT
3. VIN
2. VOUT
1. Adj
3. VIN
2. VOUT
1. Adj
3. VIN
GM317V1.01
2
GM317
3-TERMINAL 1.5A 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 Cast Temperature Operating Junction Temperature Storage Temperature Lead Temperature 1.6mm (1/6 inch) from case for 10 seconds TJ Tstg RATINGS 40 2 15 - 40 to 125 - 60 to 150 260 UNITS V W C C C
Recommended Operating Conditions
PARAMETER Output Current, IO Operating Virtual Junction Temperature, TJ Min 10 0 Max 1500 125 Unit mA C
Block Diagram
VIN
31 310 220 120 5.6K 6.3V 170 125K 12.4K 6.7K 5pF 6.8K 5.1K 5.8K 190 3.6K 110 2.5K 30pF 30pF 2.4K 12K 510 160 6.3V 200 105 4.0 13K
6.3V
VOUT
ADJ
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GM317V1.01
GM317
3-TERMINAL 1.5A ADJUSTABLE REGULATOR
Electrical Characteristics (Unless otherwise noted, VI - VO = 5V and IO= 0.5A. TJ = Full
Range, unless otherwise noted) Parameter
Line Regulation (note 2)
Symbol
VOI
Test Condition
3V VIN - VOUT 40V, TJ = 25C 3V VIN - VOUT 40V, VOUT = 10V, f = 120Hz
Min
Typ
0.01 0.02 65
Max
0.04 0.07
Unit %/V
Ripple Rejection Ratio
VOUT = 10V, f = 120Hz, 10F capacitor between ADJ and GND 10mA IOUT 1.5A, TJ = 25C VO 5V VO > 5V VO 5V VO > 5V
66
80 5 0.1 20 0.3 25 0.5 70 1.5
dB
mV % mV %
Load regulation (note 3)
VOL 10mA IOUT 1.2A
Output Voltage Change with Temperature
VOT
Full Temperature Range
%
0.3 0.003 3.5 50 10 100 5.0 1.3 1
Long Term Stability (Note 4)
Output Noise Voltage
TJ = 125 OC, VIN - VOUT = 40V, after 1000hr
10Hz f 10KHz, TJ = 25C
%
% mA A A V
Minimum Load Current Adjustment Pin Current
Adjustment Pin Current Change Reference Voltage IADJ IADJ
VIN - VOUT 40V
3V VIN - VOUT 40V 10mA IOUT 1.2A 3V VIN - VOUT 40V, 10mA IOUT 1.5A, P 15W 1.2
0.2 1.25
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 maintain 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.
GM317V1.01
4
GM317
3-TERMINAL 1.5A 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 flow through R2 to ground. The regulated output voltage is given by:
VOUT VIN GM317 VREF Adjust R1 IPROG R2 VOUT = VREF (1 + ) + IADJ R2 R1 VREF = 1.25V typical IADJ R2
Basic Circuit Configuration
Since the current from the adjustment terminal (IADJ) represents an error term in the equation, the GM317was 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. 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 ground end of R2 can be returned near the load ground to provide remote ground sensing and improve load regulation. 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. The figure below shows the GM317 with the recommended protection diodes for output for output voltage in excess of 25V or 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 VOUT VIN
GM317
R1 CIN Adjust R2 CADJ CO D2 1N4002
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GM317V1.01
GM317
3-TERMINAL 1.5A ADJUSTABLE REGULATOR
Typical Performance Characteristics
4.0 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0
VI = 15V VO= 10V -50 -25 0 25 50 75 100125 150 IL = 1.5A IL = 0.5A 100
@ VOUT, output Voltage Change (%)
3.0
TJ = 25C
@ Adjustment Pin Current (A)
@ IOUT, output Current (A)
90 80 70 60 50 40 30 20 10 0
2.0
-55C
1.0 0 0 10 20
150C
30
40
0
25
50
72
100
125
TJ, Junction Temperature (C) Figure 1. Load Regulation
VIN - VOUT, Input - Output Voltage differential (Vdc) Figure 2. Current Limit
Ambient Temperature (C) Figure 3. Adjustment Pin Current vs. Temperature
3.0 @ VIN, - VOUT, Input - Output Voltage Differential (Vdc)
5.0
@ IB, Quiescent Current (mA)
2.5 1.5
IL = 1.5A
4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0
TJ = -55C
@ RR, Ripple Rejection (dB)
VOUT = 100mV
100
CADJ = 10F
4.5
80 60 40 20 IL = 500mA 0
f = 120Hz TJ = 25C VIN - VOUT = 5V Without CADJ
1A 500mA
25C 150C
1.0
20mA 200mA
0
-50-25 0 25 50 75 100 150 125 TJ, Junction Temperature (C) Figure 4. Dropout Voltage
0
10
20
30
40
0
5.0 10 15
20 30
35
25
40
VIN - VOUT, Input - Output Voltage differential (Vdc) Figure 5. Minimum Operating current
VOUT, Output Voltage Figure 6. Ripple Rejection vs. Output Voltage
100 @ RR, Ripple Rejection (dB) 80 60 40 20 0
CLOAD = 10F Without CADJ 100 1.0K 10K 100K 1.0M 10M IL = 500mA VIN = 15V VOUT = 10V TJ = 25C
0
GM317V1.01
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VIN - VOUT, Input - Output Voltage differential (Vdc) Figure 7. Ripple Rejection vs. Frequency
GM317
3-TERMINAL 1.5A ADJUSTABLE REGULATOR
Package Outline Dimensions - SOT223
0.248 - 0.264 (6.30 - 6.71) 0.116 - 0.124 (2.95 - 3.15) 0.010 - 0.014 (0.25 - 0.36)
1016 -
0.071 (1.8) MAX
0.264 - 0.287 (6.71 - 7.29)
0.130 - 0.146 (3.30 - 3.71)
0.0008 - 0.0040 (0.0203 - 0.1016) 10 - 16 0.012 (0.31) 0.090 (2.29) 0.033 - 0.041 (0.84 - 1.04) NOM 10 MAX
MIN
0.025 - 0.033 (0.64 - 0.84) 0.81 (4.6)NOM
NOM
Package Outline Dimensions - TO263
0.390 - 0.415 (9.906 - 10.541)
0.105 - 0.180 (4.191 - 4.572)
0.045 - 0.055 (1.143 - 1.397)
0.060 (1.524) TYP
15 TYP
0.330 - 0.370 (8.382 - 9.398)
0.143 + 0.012 0.143 - 0.002 (3.632 + 0305) (3.362 - 0.508)
0.059 (1.499) TYP 0.050 +/- 0.012 (1.270 +/- 0.305) 0.020 - 0.039 (0.510 - 0.990)
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GM317V1.01
0.090 - 0.110 (2.286 - 2.794)
0.050 (1.270)
0.013 - 0.023 (0.330 - 0.584)
GM317
3-TERMINAL 1.5A ADJUSTABLE REGULATOR
Package Outline Dimensions - TO252
0.039 - 0.050 (1.020 - 1.270) 0.055 - 0.080 (1.400 - 2.030) 0.018 - 0.023 (0.460 - 0.580)
0.205 - 0.215 (5.210 - 5.460)
SEATING PLAN
0.210 - 0.228 (5.330 - 5.800)
0.370 - 0.410 (9.400 - 10.420)
0.090 (2.285) TYP 0.180 (4.570) TYP
0.045 - 0.060 (1.150 - 1.520) 0.030 - 0.045 (0.760 - 1.140)
0.020 (0.510) MIN 0.018 - 0.023 (0.460 - 0.580)
GM317V1.01
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GM317
3-TERMINAL 1.5A ADJUSTABLE REGULATOR
Ordering Number
GM 317
APM Gamma Micro Circuit Type
TA3
Package Type TA3: TB3: TC3: ST3: TO263 TO220 TO252 SOT223
T
Shipping Type
T: Tube R: Tape & Reel
8 10 6
9
GM317V1.01

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