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ISSUED DATE :2004/12/28 REVISED DATE :2006/04/18B
GJ2138
Description
1 . 5 A C M O S L o w D ro p o u t Vo l t ag e R e g u l a t o r
The GJ2138 series of positive, linear regulators feature low quiescent current (45 A typ.) with low dropout voltage, making them ideal for battery applications. These rugged devices have both Thermal Shutdown, and Current Fold-back to prevent device failure under the "Worst" of operating conditions. The GJ2138 is stable with an output capacitance of 4.7 F or greater.
Features & Low Dropout Voltage Very
Functional Block Diagram
&Guaranteed 1.5A output &Over-Temperature Shutdown &Current Limiting &Short Circuit Current Fold-back &Highly Accurate 1.5% &Low Temperature Coefficient
Applications & Battery Powered Widgets
&Instrumentation &Wireless Devices &PC Peripherals &Portable Electronics
Package Dimensions TO-252
REF. A B C D E F S
Millimeter Min. Max. 6.40 6.80 5.20 5.50 6.80 7.20 2.40 3.00 2.30 REF. 0.70 0.90 0.60 0.90
REF. G H J K L M R
Millimeter Min. Max. 0.50 0.70 2.20 2.40 0.45 0.55 0 0.15 0.90 1.50 5.40 5.80 0.80 1.20
Typical Application Circuit
GJ2138
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ISSUED DATE :2004/12/28 REVISED DATE :2006/04/18B
Absolute Maximum Ratings
Parameter
Input Max Voltage Output Current Output Voltage Operating Ambient Temperature Junction Temperature Maximum Junction Temperature Thermal Resistance Internal Power Dissipation EDS Classification
*Measure jc on backside center of tab.
Symbol
VIN IOUT VOUT Topr Tj Tj Max jc (Non-Conductive Epoxy)* ja PD
Ratings
8 PD/( VIN- VO) 1.5~5.0 -40 ~ +85 -40 ~ +125 150 30 140 1 B
Unit
V A V : : : : /W : /W W
Electrical Characteristics VIN=VOUT(T)+2V, Ta=25 : unless otherwise noted
Parameter Output Voltage Output Current Current Limit Load Regulation Dropout Voltage Quiescent Current Ground Pin Current Line Regulation Input Voltage
Over Temperature Shutdown Over Temperature Hysterisis
Symbol VOUT(E)
(Note1)
Condition
IO=1mA VO>1.2V VO>1.2V VIN=VOUT(T)+2V, IO=1mA to 1.5A IO=1.5A VO=VOUT(E)-2% 1.4VMin
-1.5% 1.5 1.5 -1 -0.15 -0.1 -0.4 Note3 -
TYP
VOUT(T)
(Note2)
Max
1.5% 1 1300 800 600 70 0.15 0.1 0.4 7 -
Unit
V A A % mV A A % V : : ppm/ : mA dB Vrms
IO ILIM REGLOAD VDROPOUT IQ IGND REGLINE VIN OTS OTH TC ISC PSRR eN
2.0 0.2 45 45 0.02 150 30 30 750 70 50 20 30
VIN= VOUT(T)+2V, IO=0mA VIN= VOUT(T)+2V, IO=1mA~1.5A VOUT(T)<2.0V IO=1mA VIN=VOUT(T)+1 to 2.0V VOUT(T)<4.0V VOUT(T)+2 4.0V VOUT(T)
Output Voltage Temperature Coefficient Short Circuit Current Power Supply Rejection Output Voltage Noise
VIN=VOUT(T)+1V, VOUT<0.4V f=100Hz f=1kHz f=10kHz f=10Hz~100kHz, Io=10mA, Co=4.7 F Io=100mA Co=4.7 F
-
Note 1: VOUT (E) =Effective Output Voltage (i.e. the output voltage when "VOUT (T) + 2.0V" is provided at the VIN pin while maintaining a certain IOUT value). 2: VOUT (T) =Specified Output Voltage 3: VIN (MIN) =VOUT+VDROPOUT
Ordering Information ( contd. )
Part Number GJ2138-15 GJ2138-19 GJ2138-33 GJ2138-50
XXXX XXXX XXXX XXXX
Marking 8T152 8T192 8T332 8T502
Output Voltage 1.5V 1.9V 3.3V 5.0V
Part Number GJ2138-18 GJ2138-25 GJ2138-47
XXXX XXXX XXXX
Marking 8T182 8T252 8T472
Output Voltage 1.8V 2.5V 4.75V
GJ2138
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ISSUED DATE :2004/12/28 REVISED DATE :2006/04/18B
The GJ2138 series of COMS regulators contain a PMOS pass transistor, voltage reference, error amplifier, over-current protection, and thermal shutdown. The P-channel pass transistor receives data from the error amplifier, over-current shutdown, and thermal protection circuits. During normal operation, the error amplifier compares the output voltage to a precision reference. Over-current and Thermal shutdown circuits become active when the junction temperature exceeds 150 : , or the current exceeds 2.2A. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120 : . The GJ2138 behaves like a current source when the load reaches 2.2A. However, if the load impedance drops below 0.3 , the current drops back to 600mA to prevent excessive power dissipation. Normal operation is restored when the load resistance exceeds 0.75 .
Detailed Description
The GJ2138 is stable with an output capacitance to ground of 4.7 F or greater. Ceramic capacitors have the lowest ESR, and will offer the best AC performance. Conversely, Aluminum Electrolytic capacitors exhibit the highest ESR, resulting in the poorest AC response. Unfortunately, large value ceramic capacitors are comparatively expensive. One option is to parallel a 0.1 F ceramic capacitor with a 10 F Aluminum Electrolytic. The benefit is low ESR, high capacitance, and low overall cost. A second capacitor is recommended between the input and ground to stabilize Vin. The input capacitor should be at least 0.1 F to have a beneficial effect. All capacitors should be placed in close proximity to the pins. A "Quiet" ground termination is desirable. This can be achieved with a "Star" connection.
External Capacitors
Characteristics Curve
GJ2138
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ISSUED DATE :2004/12/28 REVISED DATE :2006/04/18B
115 : 85 : 55 :
25 : -5 : -45 :
GJ2138
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ISSUED DATE :2004/12/28 REVISED DATE :2006/04/18B
Important Notice: All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of GTM. GTM reserves the right to make changes to its products without notice. GTM semiconductor products are not warranted to be suitable for use in life-support Applications, or systems. GTM assumes no liability for any consequence of customer product design, infringement of patents, or application assistance. Head Office And Factory: Taiwan: No. 17-1 Tatung Rd. Fu Kou Hsin-Chu Industrial Park, Hsin-Chu, Taiwan, R. O. C. TEL : 886-3-597-7061 FAX : 886-3-597-9220, 597-0785 China: (201203) No.255, Jang-Jiang Tsai-Lueng RD. , Pu-Dung-Hsin District, Shang-Hai City, China TEL : 86-21-5895-7671 ~ 4 FAX : 86-21-38950165
GJ2138
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