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GS1117 Schematic ( PDF Datasheet ) - Globaltech

Teilenummer GS1117
Beschreibung 800mA Low Dropout Voltage Regulator
Hersteller Globaltech
Logo Globaltech Logo 




Gesamt 10 Seiten
GS1117 Datasheet, Funktion
800mA Low Dropout Voltage Regulator
Product Description
The GS1117/R series of adjustable and fixed
voltage regulators are designed to provide 800mA
output current and to operate down to 1V
input-to-output differential.
The dropout voltage of the device is guaranteed
maximum 1.3V at maximum output current,
decreasing at lower load currents.
On-chip trimming adjusts the reference voltage to
1%. Current limit is also trimmed, minimizing the
stress under overload conditions on both the
regulator and power source circuitry.
The GS1117/R devices are pin compatible with
other three-terminal SCSI regulators and are
offered in the low profile surface mount SOT-223
and SOT-89 packages.
Features
Three Terminal Adjustable or Fixed Voltages
* 1.5V, 1.8V, 2.5V, 2.85V, 3.3V and 5.0V.
Output Current of 800mA
Operates Down to 1V Dropout
Line Regulation: 0.2% Max.
Load Regulation: 0.4% Max.
RoHS Compliant, 100%Pb & Halogen Free
Applications
High Efficiency Linear Regulators
Post Regulators for Switching Supplies.
Battery Chargers
Active SCSI Terminators (Sound Cards)
Power Management for Notebook
Battery Powered Instrumentation
Block Diagram
IN
+
-
GND
THERMAL
LIMIT
ADJ
OUT
For Fixed Voltage Device
www.gs-power.com 1






GS1117 Datasheet, Funktion
Application Hints (Continue)
Output Voltage
The GS1117/R series develops a 1.25V reference voltage between the output and the adjust terminal. Placing a
resistor between these two terminals causes a constant to flow through R1 and down through R2 to set the overall
output voltage. This current is normally the specified minimum load current of 10mA. Because IADJ is very small
and constant it represents a small error and it can usually be ignored.
Vin IN OUT Vout
GS1117/R
Vref R1
Cin
10uF
ADJ
EN
IADJ
50uA
R2
VOUT=VREF(1+R2/R1)+IADJR2
Figure 2.
Load Regulation
True remote load sensing it is not possible to provide, because the GS1117/R is a three terminal device. The
resistance of the wire connecting the regulator to the load will limit the load regulation. The data sheet
specification for load regulation is measured at the bottom of the package. Negative side sensing is a true Kelvin
connection, with the bottom of the output divider returned to the negative side of the load.
The best load regulation is obtained when the top of the resistor divider R1 is connected directly to the case not
to the load. If R1 were connected to the load, the effective resistance between the regulator and the load would be:
RP • ( R2+R1 ) / R1 , RP = Parasitic Line Resistance
Connected as shown, Rp is not multiplied by the divider ratio
RP
Parasitic Line Resistance
Vin IN OUT
GS1117/R
ADJ
R1
RL
EN R2
*CONNECT R1 TO CASE
*CONNERT R2 TO LOAD
Figure 3.
In the case of fixed voltage devices the top of R1 is connected Kelvin internally, and the ground pin can be used for
negative side sensing.
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