Document
GS1086
New Product
Vishay Semiconductors
formerly General Semiconductor
1.5A Low Dropout Positive Adjustable Regulator
SOT-223 TO-252 (DPak) TO-220AB TO-263AB (D2Pak)
1 2 3 1 1 2 3 2 3
GS1086CST
GS1086CE
2 1
3
GS1086CT
GS1086CM
Pin Definition
1. Adjust/Gnd. 2. Vout (tab) 3. Vin
Description
The GS1086 is a low dropout three terminal regulator with 1.5A output current capability. The output voltage is adjustable with the use of a resistor divider. For fixed output voltage versions, the output voltage is internally set at 2.5V, 2.85V, 3.3V or 5V. Dropout is guaranteed at a maximum of 1.5V at maximum output current. Its low dropout voltage and fast transient response make it ideal for low voltage microprocessor applications. Internal current and thermal limiting provides protection against any overload condition that would create excessive junction temperatures.
Features
• Dropout Voltage 1.3V at 1.5A Output Current • Fast Transient Response • Line Regulation typically at 0.015% • Load Regulation typically at 0.1% • Internal thermal and current limiting • Adjustable Output Voltage or Fixed 2.5V, 2.85V, 3.3V, 5V • Standard 3-Pin Power Packages Functional Block Diagram
Applications
• Post Regulator for Switching Supply • Battery Chargers • Constant-Current Regulators • PC Add-On Card
Mechanical Data
VIN Current Amp
Case: TO-220AB, TO-263AB (D2PAK), TO-252 (DPAK) and SOT-223 High temperature soldering guaranteed: 260°C/10 seconds at terminals
VREF 1.25V 55µA
+
+ GM --
Thermal Limit
Current Limit VOUT
Case outlines are on the back page
For fixed voltage device
ADJ
GND
Document Number 74801 12-Mar-02
www.vishay.com 1
GS1086
Vishay Semiconductors
formerly General Semiconductor
Maximum Ratings and Thermal Characteristics
Parameter Vin Pin to ADJ/GND Pin Thermal Resistance – Junction to Case TO-220AB TO-252 TO-263AB SOT-223 Operating Junction Temperature Range Storage Temperature Range
(TA = 25°C unless otherwise noted)
Symbol Vin
Value 7 3.0 8.0 3.0 15.0 0 to +125 – 65 to 150
Unit V
RθJC
°C/W
TJ Tstg
(2)
°C °C
Electrical Characteristics (1)
Parameter
TJ = 25°C
, VIN = 5V, Io = 10mA unless otherwise noted.
Symbol
Test Conditions TJ = 25°C 0°C ≤ TJ ≤ 125°C 2.65V ≤ VIN ≤ 7V 10mA ≤ Io ≤ 1.5A GS1086-2.5 VIN = 5V GS1086-2.85 VIN = 5V GS1086-3.3 VIN = 5V GS1086-5 VIN = 7V GS1086 0°C ≤ TJ ≤ 125°C 2.65V ≤ VIN ≤ 7V 10mA ≤ Io ≤ 1.5A 2.65V ≤ VIN ≤ 7V TJ = 25°C 0°C ≤ TJ ≤ 125°C 10mA ≤ Io ≤ 1.5A TJ = 25°C 0°C ≤ TJ ≤ 125°C 0°C ≤ TJ ≤ 125°C Io = 1.5A Io = 1.0A Io = 500mA 0°C ≤ TJ ≤ 125°C 2.65 ≤ Vin ≤ 7V 10mA ≤ Io ≤ 1.5A 0°C ≤ TJ ≤ 125°C 2.65 ≤ Vin ≤ 7V 10mA ≤ Io ≤ 1.5A 0°C ≤ TJ ≤ 125°C Io = 0.5A 0°C ≤ TJ ≤ 125°C 0°C ≤ TJ ≤ 125°C
Min 1.238 1.225
Typ 1.250 1.250
Max 1.262 1.275
Unit
Reference Voltage
VREF
V
Output Voltage
VOUT
2.47 2.82 3.26 4.95 0.98VN
2.5 2.85 3.30 5.00 VN
2.53 2.88 3.33 5.05 1.02VN
V
Line Regulation
REGline
0.015 0.02 0.1 0.2 1.3 1.25 1.2 1.5 2.0 55
0.2 0.2 0.3 0.4 1.5 1.45 1.4
% VO
Load Regulation
REGload
% VO
Dropout Voltage
VDROP
V
Output Current Adjust Pin Current
Io Iadj
A 120 µA
Adjust Pin Current Change
∆Iadj
0.2
5
µA
Temperature Stability Minimum Load Current Adjustable Version
TS ILMIN
0.8 3 10
%VO mA
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Document Number 74801 12-Mar-02
GS1086
Vishay Semiconductors
formerly General Semiconductor
Electrical Characteristics (1) (con’t.)
Parameter Quiescent Current Fixed Voltage Version RMS Output Noise Ripple Rejection Ratio Thermal Regulation Long Term Stability IQ N RR RTH
TJ = 25°C
(2)
, VIN = 5V, Io = 10mA unless otherwise noted.
Symbol
Test Conditions 0°C ≤ TJ ≤ 125°C 10HZ ≤ f ≤ 10 kHZ f = 120 HZ, CO = 25µF Cadj = 25µF TA = 25°C, 30ms Pulse TA = 125°C, 1000 Hrs
Min
Typ 10 0.003
Max 14
Unit mA %VO dB
60
68 0.02 0.3 0.05
%/W %VO
Notes: (1) All parameters, except nominal output voltage are specified for the variable voltage version, allowing a wider Vin Range. The specified limits also apply for the fixed voltage versions over the allowable input voltage range: GS1086-2.5 (3.9V - 7.0V), GS1086-2.85 (4.25V - 7.0V), GS1086-3.3 (4.75V - 7.0V), GS1086-5 (6.4V - 7.0V). (2) To maintain the specified junction temperatures, low duty cycle pulse testing is required for most parameters.
Typical Application Circuit
VIN 5V 3 2 R1 125Ω 1% R2 205Ω 1% VOUT 3.3V
VIN 5V
3
GS1086-2.5 GS1086-2.85 GS1086-3.3 GS1086-5 1
2
VOUT
GS1086 1 ADJ
VREF
C1 10µF
+
+
C2 10µF
C1 10µF
+
+
C2 10µF
Fixed Voltage Regulator
Adjustable Voltage Regulator
Notes: VREF = VOUT – VADJ = 1.25V (typ.) VOUT = VREF x (1+R2/R1) + IADJ x R2 IADJ = 55µA (typ.) (1) C1 needed if device is far away from filter capacitors (2) C2 required for stability
Document Number 74801 12-Mar-02
www.vishay.com 3
GS1086
Vishay Semiconductors
formerly General Semiconductor
Ratings and Characteristic Curves (TA = 25°C unless otherwise noted)
Fig. 1 – Dropout Voltage (VOUT = 3.3V)
2.0 1.30 IOUT = 1.5A 1.6 TJ = 50°C 1.25
Fig. 2 – Dropout Voltage v.s. Tem.