G5U2187 ETL | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 7
Technical content
G5U2187 Page: 1/7 ISSUED DATE :2006/04/12 REVISED DATE : GG 55 UU 22 11 88 77 77 55 00 mm AA CC MM OO SS PP oo ss ii tt ii vv ee VV oo ll tt aa gg ee RR ee gg uu ll aa tt oo rr
Description
The G5U2187 of positive, linear regulators feature low quiescent current (45A typ.) with low dropout voltage, making then ideal for battery applications. Output voltages are set at the factory and trimmed to 1.5% accuracy. These rugged devices have both Thermal Shutdown, and Current Fold-back to prevent device failure under the “Worst” of operating conditions. The G5U2187 is stable with an output capacitance of 4.7F or greater. Features Functional Block Diagram &Very Low Dropout Voltage &Guaranteed 750mA output &Over-Temperature Shutdown &Current Limiting &Short Circuit Current Fold-back &Low Temperature Coefficient &Noise Reduction Bypass Capacitor &Power-saving Shutdown Mode &Adjustable Version
Applications
&Battery Powered Widgets &Instrumentation &Wireless Devices &PC Peripherals &Portable Electronics Package Dimensions A 4.40 4.80 c2 1.25 1.45 b 0.66 0.91 L2 1.27 REF. L4 0.00 0.30 B D 8.6 9.0 c 0.36 0.5 e 1.70 REF. L1 2.29 2.79 L 14.6 15.8 E 9.80 10.4 0˚ 8˚ Typical Application Circuit
G5U2187 Page: 2/7 ISSUED DATE :2006/04/12 REVISED DATE : Absolute Maximum Ratings Parameter Symbol Ratings Unit Input Max Voltage VIN 8 V Output Current IOUT PD/( VIN- VO) mA Output Voltage VOUT Gnd-0.3 to VIN+0.3 V Operating Ambient Temperature Topr -40 ~ +85 : Junction Temperature Tj -40 ~ +125 Maximum Junction Temperature Tj Max 150 Internal Power Dissipation(æT=100:) PD 3.0 W EDS Classification B Electrical Characteristics TA=25 unless otherwise noted (VIN=VOUT (T) + 2V, VEN=VIN, CIN=1uF, COUT=4.7uF) Parameter Symbol Condition Min TYP Max Unit Output Voltage VOUT(E) (Note1) IO=1mA, VIN=VOUT(T)+2V -1.5 VOUT(T) (Note2) 1.5 % Output Current IO VO>1.2V 750 - - mA Current Limit ILIM VO>1.2V 750 - - mA Short Circuit Current ISC VIN=VOUT(T)+1V, VO < 0.4V - 750 - mA Load Regulation REGLOAD VIN=VOUT(T)+2V, IO=1mA to 750mA -1 0.2 1 % VOUT(T)=1.5V - - 1000 VOUT(T)=1.8V - - 650 Dropout Voltage VDROPOUT IO=750mA VO=VOUT(E)-2% VOUT(T)2.0V - - 500 mV Quiescent Current IQ VIN=VOUT(T)+2V, IO=0mA - 45 70 A Ground Pin Current IGND VIN=VOUT(T)+2V, IO=1mA to 750mA - 45 - A IO=1mA VIN=VOUT(T)+1 to VOUT(T)+2 4.0VVOUT(T) -0.4 - 0.4 Input Voltage VIN Note3 - 7 V Over Temperature Shutdown OTS - 150 - : Over Temperature Hysterisis OTH - 30 - : Output Voltage Temperature Coefficient TC - 30 - ppm/: ADJ Input Bias Current IADJ - 1 - A Minimum Load Current ILoad VIN=2.5V - - 70 A ADJ Reference Voltage VREF 1.221 1.240 1.26 V f=1kHz - 75 - f=10kHz - 55 - Power Supply Rejection PSRR Io=100mA Co=4.7F (ceramic) f=100kHz - 30 - dB Output Voltage Noise eN f=10Hz~100kHz, Io=10mA, Co=4.7F - 30 - Vrms VEH VIN=2.7V to 7V 2.0 - VIN V EN Input Threshold VEL VIN=2.7V to 7V 0 - 0.4 V IEH VEN=VIN, VIN=2.7V to 7V - - 1 A EN Input Bias Current IEL VEN= 0V, VIN=2.7V to 7V - - 1 A Shutdown Supply Current ISD VIN=5V, VO=0V, VEN<VEL - 0.5 2 A 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
G5U2187 Page: 3/7 ISSUED DATE :2006/04/12 REVISED DATE : Ordering Information ( contd. ) Part Number Marking Output Voltage Part Number Marking Output Voltage G5U2187-AD 7HAD2 XXXX Adjustable Detailed Description The G5U2187 of COMS regulator contains 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 140:, 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 G5U2187 behaves like a current source when the load reaches 2.2A. However, if the load impedance drops below 0.3ohms, the current drops back to 600mA to prevent excessive power dissipation. Normal operation is restored when the load resistance exceeds 0.75ohms. External Capacitors The G5U2187 is stable with an output capacitance to ground of 4.7F 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 0.1F ceramic capacitor with a 10uF 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 0.1F 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. Enable When EN pin is pulled low, the PMOS pass transistor shuts off, and all internal circuits are powered down. In this state, the quiescent current is less than 2A. This pin behaves much like an electronic switch. 100K resistor is necessary between VEN source and EN pin when VEN is high than VIN. (Note: There is no internal pull-up for EN pin. It can not be floating.) Adjustable Version The adjustable version uses external feedback resistors to generate an output voltage anywhere from 1.5V to 5.0V. Vadj is trimmed to 1.24V and Vout is given by the equation: VOUT=Vadj * (1+R1/R2) Feedback resistors R1 and R2 should be high enough to keep quiescent current low, but increasing R1+R2 will reduce stability. In general, R1 and R2 in the 10’s of k will produce adequate stability, given reasonable layout precautions. To improve stability characteristics, keep parasitic on the ADJ pin to minimum, and lower R1 and R2 values.
G5U2187 Page: 4/7 ISSUED DATE :2006/04/12 REVISED DATE : Characteristics Curve
G5U2187 Page: 5/7 ISSUED DATE :2006/04/12 REVISED DATE :
G5U2187 Page: 6/7 ISSUED DATE :2006/04/12 REVISED DATE :
G5U2187 Page: 7/7 ISSUED DATE :2006/04/12 REVISED DATE : External Resistor Divider Table R1(k) 1 2 5 10 20 R1(k) 1 2 5 10 20 VOUT R2(k)=(1.24*R1(k))/(VOUT-1.24) VOUT R2(k)=(1.242*R1(k))/(VOUT-1.242) Note: Small load (greater than 2mA) is necessary as R1 or R2 is larger than 50k. Otherwise, output voltage probably can not be pulled down to 0V on disable mode. 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: 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