Gamma GM317LS8RG 3-terminal 100ma adjustable regulator Datasheet

GM317L
3-TERMINAL 100mA
ADJUSTABLE REGULATOR
Description
Features
The GM317L is an adjustable 3-terminal positive
voltage regulator capable of supplying 100mA
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.
GM317L 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.
„
Output current up to 100mA
„
Output Voltages 1.2V to 37V
„
Internal thermal overload protection
„
Internal short circuit current limiting
„
Output transistor safe area
compensation
„
Floating operation for high voltage
applications
„
Available in TO-92 and SO8 packages
Applications
„
„
„
„
Voltage Regulators
Power Supplies
Current Regulators
„
„
„
Switching Regulators
Current Limiter
Constant Current Battery Charger
Current Limited Charger
Typical Application Circuit
VIN
L
VIN
GM317L VOUT
ADJ
CIN*
0.1µF
IADJ
VOUT
R1
240Ω
CO**
1µF
* 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 100µA, the error associated with this term is negligible
in most applications.
GM317LV2.01
R2
1
GM317L
3-TERMINAL 100mA
ADJUSTABLE REGULATOR
Marking Information and Pin Configurations (Top View)
TO 92
SO 8
1. VIN
2. VOUT
3. VOUT
Adj 1
2
4. Adj
3 VIN
GM317LG
VAYWW
317LG
AYWW
8. NC
7. VOUT
6. VOUT
5. NC
VOUT
G: Green Product
A: Assembly / Test site code
Y: Year
WW: Week
Ordering Information
Ordering Number
VOUT
GM317LT92BG
GM317LT92RLG
GM317LV2.01
GM317LS8RG
2
Adj
Package
Shipping
TO 92
1,000 Units/ESD Bag
TO 92
SO 8
2,000 Units/Ammo Pack (Tape)
2500 Units / Reel
GM317L
3-TERMINAL 100mA
ADJUSTABLE REGULATOR
Absolute Maximum Ratings
PARAMETER
RATINGS
UNITS
Input Voltage, VI
41
V
Input to Output Differential Voltage, VI – VO
40
V
Operating Junction Temperature
TJ
0 to 125
°C
Storage Temperature
Tstg
- 60 to 150
°C
260
°C
Lead Temperature 1.6mm (1/6 inch) from case for 10 seconds
Recommended Operating Conditions
PARAMETER
Min
Max
Unit
Output Current, IO
10
100
mA
Operating Virtual Junction Temperature, TJ
0
125
°C
Block Diagram
IN
Q14
Q20A
Q20B
Q20C
Q20D
Q17
Q14B
Q20E
R9
300
R3
3.7K
Q1
Q2
Q5
R22
1.0K
Q6
R25
4.7K
Q26
Q3
Q24
Q21
Q22
R1
200
C3
20pF
R2
500
Q8
Q23
Q4
C1
30pF
C2
15pF
R24
5K
Q16
R7
6.57K
C5
6pF
Q7 Q12
R27
2K
Q25
R18
30K
Q18
6.2V
Q15
R8
300
R19
12K
Q11A
R6
370
Q11B
R21
8K
R10
600
R11
60
R28
10
R12
0.3
R26
0.3
Q19
6.2V
R15
60K
OUT
Q9
Q10
R4
2.4K
R5
12K
R23
60
ADJ
GM317LV2.01
R20
300K
3
GM317L
3-TERMINAL 100mA
ADJUSTABLE REGULATOR
Electrical Characteristics (Unless otherwise noted, VI - VO = 5V and IO= 40mA. TJ = 0°C to
125°C, unless otherwise noted)
Parameter
Line Regulation (note 2)
Symbol
ΔVOI
Test Condition
Typ
Max
3V ≤ VIN – VOUT ≤ 40V, TA = 25°C
0.01
0.04
3V ≤ VIN – VOUT ≤ 40V,
0.02
0.07
VO ≤ 5V
5
25
mV
VO > 5V
0.1
0.5
%/ VO
VO ≤ 5V
20
70
mV
VO > 5V
0.3
1.5
%/ VO
50
100
µA
0.2
5.0
µA
1.25
1.3
V
3.5
10
mA
10mA ≤ IOUT ≤ 100mA,
TA = 25°C
Load regulation
ΔVOL
10mA ≤ IOUT ≤ 100mA
Adjustment Pin Current
Adjustment Pin Current
Change
IADJ
ΔIADJ
3V ≤ VIN – VOUT ≤ 40V
10mA ≤ IOUT ≤ 100mA
Reference Voltage
3V ≤ VIN – VOUT ≤ 40V,
10mA ≤ IOUT ≤ 100mA,
Minimum Load Current
VIN – VOUT ≤ 40V
Maximum Output Current
Min
IO(MAX)
1.2
VIN – VOUT ≤ 40V, TA = 25°C
25
50
VIN – VOUT ≤ 15V
100
200
VOUT = 10V, f = 120Hz
Ripple Rejection Ratio
VOUT = 10V, f = 120Hz, 10μF
capacitor between ADJ and GND
Long Term Stability
(Note 3)
TA = 125 OC, 1000hr
Output Noise Voltage
10Hz ≤ f ≤ 10KHz, TA = 25°C
Unit
%/V
mA
65
66
80
dB
0.3
%
0.003
%
Note 1: All characteristics are measured with a 0.1µF capacitor across the input and a 1µF capacitor across the output.
Note 2: Input regulation is expressed here as the percentage change in output voltage per 1V change at the input.
GM317LV2.01
Note 3: 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.
4
GM317L
3-TERMINAL 100mA
ADJUSTABLE REGULATOR
Application Information
„
Basic Circuit Operation
The GM317L is a 3- terminal floating regulator. In operation, tit develops and maintains a nominal 1.25V
reference (VREF) between its output and adjustment terminal. This reference voltage is converted to a
programming current flow through R2 to ground.
The regulated output voltage is given by:
VOUT
VIN
GM317L
VREF
Adjust
R2
VOUT = VREF (1 + R1 ) + IADJ R2
R1
IPROG
IADJ
R2
VREF = 1.25V typical
Basic Circuit Configuration
Since the current from the adjustment terminal (IADJ) represents an error term in the equation, the GM317Lwas
designed to minimize IADJ and make it very constant with line and load changes. To do this, all quiescent
operating current is returned to the output establishing a minimum load current requirement. If there is
insufficient load on the output, the output will rise.
Since the GM317L 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 GM317L 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 0.1µF disc or 1.0µF 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 10µF capacitor should improve ripple
rejection about 15 dB at 120Hz in a 10V application.
Although the GM317L 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 1.0µF tantalum or 25µF
aluminum electrolytic capacitor on the output swamps this effect and insures stability.
„
Protection Diodes
The figure below shows the GM317L with the recommended protection diodes for output for output voltage in
excess of 25V or high capacitance values (CO > 25µF, CADJ > 10µF). 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
GM317L
R1
CIN
CO
D2
1N4002
Adjust
R2
CADJ
GM317LV2.01
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.
5
GM317L
3-TERMINAL 100mA
ADJUSTABLE REGULATOR
Package Outline Dimensions – TO 92
3.85 - 4.19
4.7 - 5.2
4.9 - 5.2
12.7 - 14.2
0.4 - 0.55
Typ.
1.22 - 1.32
2.10 - 2.27
Dimensions are in millimeters
Package Outline Dimensions – SO 8
0.189 - 0.197
(4.800 - 5.004)
0.228 - 0.244
(5.791 - 6.198)
0.016 - 0.050
(0.406 - 0.270)
D
0.014 - 0.020
(0.356 - 0.508)
0.050
(1.270)
TYP
0.150 - 0.157
(3.810 - 3.988)
GM317LV2.01
0.053 - 0.059
(1.346 - 1.753)
6
SEATING PLAN
0.004 - 0.010
(0.012 - 0.254)
0.008 - 0.010
(0.203 - 0.254)
8.0
MAX
GM317L
3-TERMINAL 100mA
ADJUSTABLE REGULATOR
Ordering Number
GM 317L
APM Circuit Type
Gamma Micro
T92
B
Package Type
Shipping Type
T92: TO92
S8: SO8
B: Bag
RL: Ammo Pack (Tape)
T: Tube
R: Tape & Reel
G
G:Green
Note:
Pb-free products:
♦
RoHS compliant and compatible with the current require-ments of IPC/JEDEC J-STD-020.
♦
Suitable for use in Pb-free soldering processes with 100% matte tin (Sn) plating.
Green products:
Lead-free (RoHS compliant)
♦
Halogen free(Br or Cl does not exceed 900ppm by weight in homogeneous material and total of
Br and Cl does not exceed 1500ppm by weight)
GM317LV2.01
♦
8
10
6
7
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