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GJ2148 [ETL]

1 . 5 A C M O S L o w D r o p o u t V o l t a g e R e g u l a t o r;
GJ2148
型号： GJ2148
厂家： E-TECH ELECTRONICS LTD    E-TECH ELECTRONICS LTD
描述：

1 . 5 A C M O S L o w D r o p o u t V o l t a g e R e g u l a t o r
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ISSUED DATE :2004/12/28  
REVISED DATE :2006/04/18B  
GTM  
CORPORATION  
GJ2148  
1 . 5 A C M O S L o w D r o p o u t Vo l t a g e R e g u l a t o r  
Description  
The GJ2148 series of positive, linear regulators feature low quiescent current (45ꢀA 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 GJ2148 is stable with an output capacitance of 4.7ꢀF or greater.  
Features  
Functional Block Diagram  
ԦVery Low Dropout Voltage  
ԦGuaranteed 1.5A output  
ԦOver-Temperature Shutdown  
ԦCurrent Limiting  
ԦShort Circuit Current Fold-back  
ԦHighly Accurate± 1.5%  
ԦLow Temperature Coefficient  
Applications  
ԦBattery Powered Widgets  
ԦInstrumentation  
ԦWireless Devices  
ԦPC Peripherals  
ԦPortable Electronics  
Package Dimensions  
TO-252  
Millimeter  
Millimeter  
Min.  
0.50  
2.20  
0.45  
0
0.90  
5.40  
0.80  
REF.  
REF.  
Min.  
Max.  
6.80  
5.50  
7.20  
3.00  
Max.  
0.70  
2.40  
0.55  
0.15  
1.50  
5.80  
1.20  
A
B
C
D
E
F
6.40  
5.20  
6.80  
2.40  
G
H
J
K
L
2.30 REF.  
0.70  
0.60  
0.90  
0.90  
M
R
S
Typical Application Circuit  
GJ2148  
Page: 1/5  
ISSUED DATE :2004/12/28  
REVISED DATE :2006/04/18B  
GTM  
CORPORATION  
Absolute Maximum Ratings  
Parameter  
Symbol  
Ratings  
Unit  
V
Input Max Voltage  
Output Current  
Output Voltage  
V
IN  
OUT  
OUT  
8
I
PD  
/( VIN-  
V
O)  
A
V
1.5~5.0  
-40 ~ +85  
V
Operating Ambient Temperature  
Junction Temperature  
Topr  
к
Tj  
-40 ~ +125  
к
Maximum Junction Temperature  
Tj Max  
150  
5
к
ꢁjc (Conductive Epoxy)  
*
к/W  
к/W  
W
Thermal Resistance  
ꢁja  
90  
1.2  
B
Internal Power Dissipation  
EDS Classification  
PD  
*Measure ꢁjc on backside center of tab.  
Electrical Characteristics  
VIN=VOUT(T)+2V, Ta=25к unless otherwise noted  
Parameter  
Symbol  
Condition  
=1mA  
Min  
TYP  
Max  
Unit  
VOUT(T)  
VOUT(E)  
I
O
-1.5%  
1.5%  
V
Output Voltage  
(Note2)  
(Note1)  
V
O
>1.2V  
1.5  
-
2.0  
0.2  
-
-
-
A
A
I
O
Output Current  
Current Limit  
VO  
>1.2V  
1.5  
I
LIM  
V
IN=VOUT(T)+2V, I  
O=1mA to 1.5A  
-1  
1
%
Load Regulation  
REGLOAD  
1.4V<VOUT(T)≤2.0V  
2.0V<VOUT(T)≤2.8V  
2.8V<VOUT(T)  
-
1300  
800  
600  
70  
-
I
O
=1.5A  
mV  
-
-
Dropout Voltage  
V
DROPOUT  
V
O
=VOUT(E)-2%  
-
-
V
IN= VOUT(T)+2V, I  
O=0mA  
-
-
45  
45  
-
ꢀA  
ꢀA  
I
Q
Quiescent Current  
Ground Pin Current  
V
IN= VOUT(T)+2V, I  
O=1mA~1.5A  
I
GND  
VOUT(T)<2.0V  
-0.15  
-0.1  
-0.4  
Note3  
-
0.15  
0.1  
0.4  
7
I =1mA  
O
V
IN=VOUT(T)+1 to  
%
2.0V≤VOUT(T)<4.0V  
4.0V≤VOUT(T)  
0.02  
-
Line Regulation  
REGLINE  
VOUT(T)+2  
-
V
Input Voltage  
VIN  
Over Temperature Shutdown  
Over Temperature Hysterisis  
150  
30  
-
к
к
OTS  
OTH  
-
-
Output Voltage  
Temperature Coefficient  
ppm/к  
-
30  
-
TC  
V
IN=VOUT(T)+1V, VOUT<0.4V  
-
-
-
-
-
750  
70  
50  
20  
30  
-
-
-
-
-
mA  
I
SC  
Short Circuit Current  
Power Supply Rejection  
Output Voltage Noise  
f=100Hz  
f=1kHz  
Io=100mA  
Co=4.7ꢀF  
dB  
PSRR  
f=10kHz  
f=10Hz~100kHz, Io=10mA, Co=4.7ꢀF  
ꢀVrms  
eN  
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  
Marking  
Output Voltage  
1.5V  
Part Number  
GJ2148-18  
Marking  
Output Voltage  
1.8V  
8V152  
XXXX  
8V182  
XXXX  
GJ2148-15  
8V192  
XXXX  
8V252  
XXXX  
GJ2148-19  
GJ2148-33  
GJ2148-50  
1.9V  
3.3V  
5.0V  
GJ2148-25  
GJ2148-47  
2.5V  
8V332  
XXXX  
8V472  
XXXX  
4.75V  
8V502  
XXXX  
GJ2148  
Page: 2/5  
ISSUED DATE :2004/12/28  
REVISED DATE :2006/04/18B  
GTM  
CORPORATION  
Detailed Description  
The GJ2148 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  
150к, or the current exceeds 2.2A. During thermal shutdown, the output voltage remains low. Normal  
operation is restored when the junction temperature drops below 120к.  
The GJ2148 behaves like a current source when the load reaches 2.2A. However, if the load impedance drops  
below 0.3ꢂ, the current drops back to 600mA to prevent excessive power dissipation. Normal operation is  
restored when the load resistance exceeds 0.75ꢂ.  
External Capacitors  
The GJ2148 is stable with an output capacitance to ground of 4.7ꢀF 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 0.1ꢀF ceramic capacitor with a 10ꢀF 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 0.1ꢀF 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.  
Characteristics Curve  
GJ2148  
Page: 3/5  
ISSUED DATE :2004/12/28  
REVISED DATE :2006/04/18B  
GTM  
CORPORATION  
115к  
85к  
55к  
25к  
-5к  
-45к  
GJ2148  
Page: 4/5  
ISSUED DATE :2004/12/28  
REVISED DATE :2006/04/18B  
GTM  
CORPORATION  
Important Notice:  
ó
ó
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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:  
ó
ó
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  
GJ2148  
Page: 5/5  

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