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ISSUED DATE :2005/06/01 REVISED DATE :2006/06/01B
GE1085
3A Low Dropout Positive Adjustable or Fixed-Mode Regulator
The GE1085 is a low dropout positive adjustable or fixed-mode regulator with minimum of 3A output current capability. The product is specifically designed to provide well-regulated supply for low voltage IC applications such as high-speed bus termination and low current 3.3V logic supply. GE1085 is also well suited for other applications such as VGA cards. GE1085 is guaranteed to have <1.4V dropout at full load current making it ideal to provide well-regulated outputs of 1.25 to 5.0V with 4.7 to 12V input supply by different output voltage.
Description
Features & 3-Terminal Adjustable or fixed 1.5V,1.8V,2.5V,3.3V,5.0V
& 1.4V & Fast
Maximum Dropout at Full Load current Transient response &Built-in Thermal Shutdown &Output current limiting
Package Dimensions
REF. A b c D E L4 L5
Millimeter Min. Max. 4.40 4.80 0.76 1.00 0.36 0.50 8.60 9.00 9.80 10.4 14.7 15.3 6.20 6.60
REF. c1 b1 L e L1 Ø A1
Millimeter Min. Max. 1.25 1.45 1.17 1.47 13.25 14.25 2.54 REF. 2.60 2.89 3.71 3.96 2.60 2.80
Typical Circuit
3.3V/3A
2.5V/3A
Block Diagram
GE1085
Page: 1/4
ISSUED DATE :2005/06/01 REVISED DATE :2006/06/01B
Pin Descriptions
Name Adj (GND) Vout O I/O Pin# 1 2 Adjustable (Ground only for fixed mode) The output of the regulator. A minimum of 10uF capacitor must be connected from this pin to ground to insure stability. The input pin of regulator. Typically a large storage capacitor is connected from this pin to ground to insure that the input voltage does not sag below the minimum dropout voltage during the load transient response. This pin must always be 1.4V higher than Vout in order for the device to regulate properly. Function
Vin
I
3
Absolute Maximum Ratings
Symbol Vin PD TST TOP DC Supply Voltage Power Dissipation Storage Temperature Operating Junction Temperature Range Parameter Ratings -0.3 to 12 Internally Limited -65 ~ + 150 0 ~ + 150 : : Unit V
Electrical Characteristics
Parameter Reference Voltage GE1085-ADJ GE1085-1.5 GE1085-1.8 Output Voltage GE1085-2.5 GE1085-3.3 GE1085-5.0 Line Regulator GE1085-XXX GE1085ADJ GE1085-1.5 Load Regulation GE1085-1.8 GE1085-2.5 GE1085-3.3 GE1085-5.0 Dropout Voltage (Vin-Vout) Current Limit Minimum Load Current Adjust Pin Current Quiescent Current Thermal Regulation Ripple Rejection Temperature Stability Thermal Resistance Junction-to-Ambient Thermal Resistance Junction-to-Case GE1085-XXX GE1085-XXX Adjustable model Adjustable model fixed model TA=25 : , 30ms pulse F=120Hz, COUT=25uF, Tantalum, Io=3A GE1085-XXX Io=10mA Vin=Vout+3V 60 0.5 83 70 dB % : /W Conditions Io=10mA, TJ =25 : , (Vin-Vout )=1.5V Io=10mA, TJ =25 : , 3.0V Vin 12V Io=10mA, TJ =25 : , 3.3V Vin 12V Io=10mA, TJ =25 : , 4.0V Vin 12V Io=10mA, TJ =25 : , 4.8V Vin 12V Io=10mA, TJ =25 : , 6.5V Vin 12V Io=10mA, Vout+1.5
