3 - Terminal
Adjustable Regulator
FEATURES
SMD317
DESCRIPTION
Output Voltage Range: 1.2V to 37V
Output Current Capability of 1.5A Max
0.01% line regulation
0.1% load regulation
Thermal protection built in
The SMD317 is adjustable 3-terminal positive
voltage regulator capable of supplying 1.5A over a
differential voltage range of 3V to 40V. In most
applications, it requires only two external resistors
to set the output voltage. Both input and output
regulation is better than standard fixed regulators.
SMD317 offers full overload protection. Included
on the chip are 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.
APPLICATIONS
Voltage Regulators
Power Supplies
Current Regulators
Switching Regulators
Current Limiter
Constant Current Battery Charger
Current Limited Charger
PACKAGE/ORDER INFORMATION
-
3. VIN
2. VOUT
1. ADJ/GND
Order Part Number
SMD317ST(T)
3-Pin Plastic TO-263
(Top View)
SMD317CM(T)
3. VIN
2. VOUT
1. ADJ/GND
3-Pin Plastic TO-252
Surface Mount
(Top View)
SMD317CS(T)
3. VIN
2. VOUT
1. ADJ/GND
3-Pin Plastic SOT223
Surface Mount
(Top View)
-1-
Rev A
SMD Doc #: DD0016
Copy Right © 2007, Shamrock Micro Device Corp.
SMD317
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Voltage
40V
Operational Temperature Range
-40°C to 125°C
Storage Temperature Range
-65°C to 150°C
Lead Temperature (soldering, 10 seconds)
260°C
Note 1: Exceeding these ratings could cause damage to the device. All voltages are with respect to ground. Currents are positive
into, negative out of the specified terminal.
POWER DISSIPATION TABLE
TO 263 Package
O
Thermal Resistance – Junction to Tab, θTA
3.0 C/W
Thermal Resistance – Junction to Ambient, θJA
45 C/W
O
TO 252 Package
Thermal Resistance – Junction to Tab, θTA
O
Thermal Resistance – Junction to Ambient, θJA
80 C/W
SOT223 Package
O
Thermal Resistance – Junction to Tab, θTA
15 C/W
Thermal Resistance – Junction to Ambient, θJA
135 C/W
O
Junction Temperature Calculation: TJ = TA + (PD × θJA).
The θJA numbers are guidelines for the thermal performance of the device/pc-board system.
All of the above assume no ambient airflow.
-2-
Rev A
SMD Doc #: DD0016
Copy Right © 2007, Shamrock Micro Device Corp.
SMD317
RECOMMENDED OPERATING CONDITIONS
Parameter
Symbol
Min
VIN
2.7
IO
10
Input Voltage
Load Current (with adequate heat sinking)
Input Capacitor (VIN to GND)
Output Capacitor with ESR of 10Ω max., (VOUT to GND)
-
Junction temperature
TJ
Typ
Max
Units
37
V
mA
0.1
µF
1.0
µF
125
O
C
TYPICAL APPLICATIONS
VIN
VOUT
SMD317
R1
240Ω
C1
C2
0.1µF
1µF
R2
Adjustable Regulator
VOUT
= 1.25V
(
-3-
R2
1+
R1
)
Rev A
SMD Doc #: DD0016
Copy Right © 2007, Shamrock Micro Device Corp.
SMD317
ELECTRICAL CHARACTERISTICS Unless otherwise specified, T
J = 25°C; VIN – VOUT = 5V , IO = 10mA, CIN = 0.1 µF, COUT =
10 µF, and are for DC characteristics only. (Low duty cycle pulse testing techniques are used which maintains junction and case
temperatures equal to the ambient temperature.)
Parameter
Reference Voltage
Line Regulation (see note 2)
Load regulation
Minimum Load Current
Test Conditions
Min.
Typ.
Max.
Units
1.20
1.25
1.30
V
3V ≤ VIN – VOUT ≤ 20V,TJ = 25°C
0.01
0.04
3V ≤ VIN – VOUT ≤ 20V
0.02
0.07
10mA ≤ IOUT ≤ 1.2A, TJ = 25°C
0.1
0.5
10mA ≤ IOUT ≤ 1.2A
0.3
1.5
VIN – VOUT ≤ 20V
3.5
10
mA
50
100
µA
0.2
5.0
µA
3.4
3V ≤ VIN – VOUT ≤ 20V,
10mA ≤ IOUT ≤ 1.2A, P ≤ 15W
Adjustment Pin Current
Adjustment Pin Current Change
3V ≤ VIN – VOUT ≤ 20V
10mA ≤ IOUT ≤ 1.2A
Current Limit
(VIN – VOUT) ≤ 10V
1.2
2.2
(VIN – VOUT) ≤ 15V
0.8
1.1
(VIN – VOUT) = 20V
0.15
0.4
VOUT = 10V, f = 120Hz
Ripple Rejection Ratio (Note 3)
%
A
65
VOUT = 10V, f = 120Hz, 10µF capacitor
between ADJ and GND
Output Noise Voltage (Note 3)
10Hz ≤ f ≤ 10KHz, TJ = 25°C
Long Term Stability (Note 3)
TJ = 125 C, and VIN – VOUT = 20V
Temperature Stability (Note 3)
TMIN ≤ TJ ≤ TMAX
O
%/V
dB
66
80
0.003
0.3
%
1
1
%/1000h
r
%
Note 2: Line regulation is defined as the percentage change in output voltage every 1V change at the input
Note 3: These parameters, although guaranteed, are not tested in production prior to shipment
-4-
Rev A
SMD Doc #: DD0016
Copy Right © 2007, Shamrock Micro Device Corp.
SMD317
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise specified
TO 263
0.390 - 0.415
(9.906 - 10.541)
0.105 - 0.180
(4.191 - 4.572)
0.060
(1.524)
TYP
0.045 - 0.055
(1.143 - 1.397)
15
TYP
0.330 - 0.370
(8.382 - 9.398)
0.059
(1.499)
TYP
0.143 + 0.012
0.143 - 0.002
(3.632 + 0305)
(3.362 - 0.508)
0.050 +/- 0.012
(1.270 +/- 0.305)
0.020 - 0.039
(0.510 - 0.990)
0.090 - 0.110
(2.286 - 2.794)
TO252
0.050
(1.270)
0.250 – 0.265
(6.350 – 6.730)
0.013 - 0.023
(0.330 - 0.584)
0.086 – 0.094
(2.190 – 2.380)
0.039 – 0.050
(1.020 – 1.270)
0.205 – 0.215
(5.210 – 5.460)
0.055 – 0.080
(1.400 – 2.030)
0.018 – 0.023
(0.460 – 0.580)
SEATING PLAN
0.370 – 0.410
(9.400 – 10.420)
0.210 – 0.228
(5.330 – 5.800)
0.090
(2.285)
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)
0.180
(4.570)
TYP
-5-
Rev A
SMD Doc #: DD0016
Copy Right © 2007, Shamrock Micro Device Corp.
SMD317
PACKAGE DESCRIPTION (Continued) Dimensions in inches (millimeters) unless otherwise specified
SOT223
0.248 - 0.264
(6.30 - 6.71)
0.010 - 0.014
(0.25 - 0.36)
0.116 - 0.124
(2.95 - 3.15)
0.130 - 0.146
(3.30 - 3.71)
0.264 - 0.287
(6.71 - 7.29)
10°- 16°
0.071
(1.8)
MAX
0.0008 - 0.0040
(0.0203 - 0.1016)
10°- 16°
0.012
(0.31)
0.090
(2.29)
NOM
0.033 - 0.041
(0.84 - 1.04)
MIN
0.025 - 0.033
(0.64 - 0.84)
0.81
(4.6)NOM
10°
MAX
NOM
MARKING DIAGRAM
TO263
TO252
SOT223
317
SMD317
YYWW
YYWW
SMD317
YYWW
YY = Year, WW = Working Week
-6-
Rev A
SMD Doc #: DD0016
Copy Right © 2007, Shamrock Micro Device Corp.
SMD317
IMPORTANT NOTICE
Shamrock Micro Devices (SMD) reserves the right to make changes to its products or to discontinue any
integrated circuit product or service without notice, and advises its customers to obtain the latest version of
relevant information to verify, before placing orders, that the information being relied on is current.
A few applications using integrated circuit products may involve potential risks of death, personal injury, or
severe property or environmental damage. SMD integrated circuit products are not designed, intended,
authorized, or warranted to be suitable for use in life-support applications, devices or systems or other critical
applications. Use of SMD products in such applications is understood to be fully at the risk of the customer.
In order to minimize risks associated with the customer’s applications, the customer should provide adequate
design and operating safeguards.
-7-
Rev A
SMD Doc #: DD0016
Copy Right © 2007, Shamrock Micro Device Corp.