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ISSUED DATE :2005/12/12 REVISED DATE :
GQ2171
Description
C M O S P o s i t i v e Vo l t a g e R e g u l a t o r
The GQ2171 series of positive, linear regulators feature low quiescent current (50 A typ.) with low dropout voltage and excellent PSRR, thus making them ideal for Telecommunications and other battery applications. These rugged devices have both Thermal Shutdown, and Current Fold-back to prevent device failure under the "Worst" of operating conditions. As an additional feature, the GQ2171 is stable with an output capacitance of just extended 0.22 F or greater.
Features & Low Dropout Voltage Very
Functional Block Diagram
Applications & Battery Powered Widgets
&Instrumentation &Wireless Devices &PC Peripherals &Portable Electronics &Cordless Phones &Electronic Scales &Cellular Phones &Cameras &Telecommunications
&Guaranteed 150mA output &Over-Temperature Shutdown &Current Limiting &Short Circuit Current Fold-back &Excellent PSRR Type 70dB &Noise Reduction Bypass Capacitor &Power-saving Shutdown Mode &Factor Pre-set Output Voltage
Package Dimensions
REF. A B C D E F
Millimeter Min. Max. 2.70 3.10 2.60 3.00 1.40 1.80 0.30 0.55 0 0.10 0 10
REF. G H I J K L
Dimensions Millimeter 1.90 REF. 1.20 REF. 0.12 REF. 0.37 REF. 0.60 REF. 0.95 REF.
Typical Application Circuit
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ISSUED DATE :2005/12/12 REVISED DATE :
Absolute Maximum Ratings
Parameter
Input Max Voltage Output Current Output Voltage Operating Ambient Temperature Junction Temperature Maximum Junction Temperature Power Dissipation( T=100 : ) EDS Classification
Symbol
VIN IOUT VOUT Topr Tj Tj Max PD
Ratings
6 PD/( VIN- VO) 1.5~3.3 -40 ~ +85 -40 ~ +125 150 380 B
Unit
V mA V :
mW
Electrical Characteristics TA=25
Parameter Output Voltage Current Limit Fold-back Current Load Regulation Symbol VOUT(E)
(Note1)
unless otherwise noted
Condition
IO=0.1mA, VOUT(T) 2.0V IO=0.1mA, VOUT(T)<2.0V IO=150mA VO>800mV VO=0V IO=0.1 to 150mA VOUT>2.0V VIN=VOUT(T)+0.5V VOUT 2.0V VIN=VOUT(T)+1V VOUT(T) 2.0V 1.8V VOUT(T)<2.0V 1.5V VOUT(T)<1.8V
(VOUT(T)>2.0V VIN=VOUT(T)+0.5V; VOUT(T) 2.0V VIN=VOUT(T)+1V; VSHDN=VIN, CIN=COUT=1uF)
Min
-1.0 -1.5 -2.0 150 -1 -2 -0.2 -0.4 Note3 -
TYP
VOUT(T)
(Note2)
Max
1.0 1.5 2.0 1
Unit
% mA A %
ILIM IFB REGLOAD
200 80 0.5 300 700 900 60 50 0.1 137 23 30 70 30 0.01 0.5 -
2 500 1000 1300 0.2 % 0.4 5.5 VIN 0.6 1 0.4 V : : ppm/ : dB Vrms V V A A V A A mV
Dropout Voltage Quiescent Current Ground Pin Current Line Regulation Input Voltage
Over Temperature Shutdown Over Temperature Hysterisis
VDROPOUT IQ IGND REGLINE VIN OTS OTH TC PSRR eN VSHDNH VSHDNL ISD VO,SD
IO=150mA VO=VOUT(E)-2%
VIN=5V, IO=0mA VIN=5V, IO=1mA to150mA IO=0.1mA, VOUT>2.0V VIN=VOUT(T)+0.5V to 5.5V IO=0.1mA, VOUT 2.0V VIN=VOUT(T)+1V to 5.5V
Output Voltage Temperature Coefficient Power Supply Rejection Output Voltage Noise SHDN Input Threshold SHDN Input Bias Current Shutdown Supply Current Shutdown Output Voltage
Ro=100 ,Co=2.2mF, f=1kHz f=10Hz~100kHz, Io=10mA, Co=2.2 F VSHDN=0.8* VIN VSHDN=0.6V VIN=5V, EN=0v, or 5V VIN=5V, VO=0V Output Loading 1200 , Vo=0V
0.8* VIN 0 0
Note 1: VOUT (E) =Effective Output Voltage (i.e. the output voltage when "VOUT(T)>2.0V VIN=VOUT(T)+0.5V; VOUT(T) 2.0V VIN=VOUT(T)+1V; VSHDN=VIN" is provided at the VIN pin while maintaining a certain IOUT value). 2: VOUT (T) =Specified Output Voltage 3: VIN (MIN) =VOUT+VDROPOUT
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ISSUED DATE :2005/12/12 REVISED DATE :
Ordering Information ( contd. )
Part Number GQ2171-15 GQ2171-20 GQ2171-27 GQ2171-2H GQ2171-32
XXXX XXXX XXXX XXXX XXXX
Marking 1K152 1K202 1K272 1K2H2
Output Voltage 1.5V 2.0V 2.7V 2.85V 3.2V
Part Number GQ2171-18 GQ2171-25 GQ2171-28 GQ2171-30 GQ2171-33
XXXX XXXX XXXX XXXX XXXX
Marking 1K182
Output Voltage 1.8V 2.5V 2.8V 3.0V 3.3V
1K252 1K282 1K302 1K332
1K322
The GQ2171 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 150mA. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120 : . The GQ2171 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress. The GQ2171 also incorporates current fold-back to reduce power dissipation when the output is short circuited. This feature becomes active when the output drops below 0.8 volts, and reduces the current flow by 65%. Full current is restored when the voltage exceeds 0.8 volts. The GQ2171 is stable with an output capacitance to ground of 0.22 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. A second capacitor is recommended between the input and ground to stabilize Vin. The input capacitor should be at least 1 F to have a beneficial effect. A large capacitor improves the AC ripple rejection, but also makes the output come up slowly. This "Soft" turn-on is desirable in some applications to limit turn-on surges. 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. When actively, pulled low, the PMOS pass transistor shuts off, and all internal circuits are powered down. In this state, the quiescent current is less than 1 A. This pin behaves much like an electronic switch.
Detailed Description
External Capacitors
Shutdown
Characteristics Curve
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ISSUED DATE :2005/12/12 REVISED DATE :
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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
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