GQ2181

ISSUED DATE :2005/12/12 REVISED DATE : GQ2181 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 GQ2181 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 GQ2181 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 1/5 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)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 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 N ote 1: VOUT (E) =Effective Output Voltage (i.e. the output voltage when “VOUT(T)>2.0V VIN=V OUT(T)+0.5V; V OUT(T) 2.0V V IN=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 2/5 ISSUED DATE :2005/12/12 REVISED DATE : Ordering Information ( contd. ) P art Number GQ2181-15 GQ2181-20 GQ2181-27 GQ2181-2H GQ2181-32 XXXX XXXX XXXX XXXX XXXX Marking 1L152 1L202 1L272 1L2H2 Output Voltage 1.5V 2.0V 2.7V 2.85V 3.2V P art Number GQ2181-18 GQ2181-25 GQ2181-28 GQ2181-30 GQ2181-33 XXXX XXXX XXXX XXXX XXXX Marking 1L182 Output Voltage 1.8V 2.5V 2.8V 3.0V 3.3V 1L252 1L282 1L302 1L332 1L322 The GQ2181 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 GQ2181 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress. The GQ2181 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 GQ2181 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. W hen 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 3/5 ISSUED DATE :2005/12/12 REVISED DATE : 4/5 ISSUED DATE :2005/12/12 REVISED DATE : 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 5/5