GT2153 ETL | Alldatasheet

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ISSUED DATE :2005/03/16 REVISED DATE : GGTT 22 11 55 33 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 GT2153 of positive, linear regulators feature low quiescent current (30A typ.) with low dropout voltage, making them ideal for battery applications. This rugged device has both Thermal Shutdown, and Current Fold-back to prevent device failure under the “Worst” of operating conditions. The SOT-26 version also features a “Power Good” detector, which pulls low when the output is out of regulation. The GT2153 is stable with an output capacitance of 2.2F or greater. Features Functional Block Diagram &Very Low Dropout Voltage &Guaranteed 300mA output &Over-Temperature Shutdown &Current Limiting &Short Circuit Current Fold-back &Typical Accurate± 2.0% &Adjustable output voltages &Power-saving Shutdown Mode &Power Good Detector &Low Temperature coefficient

Applications

&Battery Powered Widgets &Instrumentation &Wireless Devices &PC Peripherals &Portable Electronics &Cordless Phones &Electronic Scales Package Dimensions Millimeter Dimensions REF. Min. Max. REF. Millimeter A 2.70 3.10 G 1.90 REF. B 2.60 3.00 H 1.20 REF. C 1.40 1.80 I 0.12 REF. D 0.30 0.55 J 0.37 REF. E 0 0.10 K 0.60 REF. F 0° 10° L 0.95 REF. Typical Application Circuit 1.2V Vout=1.2(R1+r2)/R2 C2 is unnecessary when R1 or R2 < 20k PG pin is only available in the SOT-26 package option

ISSUED DATE :2005/03/16 REVISED DATE : Absolute Maximum Ratings Parameter Symbol Ratings Unit Input Max Voltage VIN 8 V Output Current IOUT PD/( VIN- VO) mA Input, Output Voltage 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 Thermal Resistance ja 260 :/W Power Dissipation(æT=100:) PD 380 mW EDS Classification B Electrical Characteristics Ta=25 VIN=5V, unless otherwise noted Parameter Symbol Condition Min TYP Max Unit Output Voltage VO VIN=5V, IO=1mA -3% - 3% V Output Current IO VIN=5V, VO>1.2 300 - - mA Current Limit ILIM VIN=5V, VO>1.2 300 450 - mA Load Regulation REGLOAD VIN=5V, IO=1mA to 300mA - 0.2 1 % 1.2V VO(NOM) 2.0V - - 1300 2.0V<VO(NOM) 2.8V - - 400 Dropout Voltage VDROPOUT IO=300mA VO=VO(NOM)-2% 2.8V<VO(NOM)<3.8V - - 300 mV Quiescent Current IQ VIN=5V, IO=0mA - 30 50 A Ground Pin Current IGND VIN=5V, IO=1mA~300mA - 35 - A VOˇ¯\`ˆV - - 0.15 Line Regulation REGLINE IO=5mA VIN=VO+1 to VO+2 VO 2.0V - 0.02 0.1 Input Voltage VIN Note1 - 7 V Over Temperature Shutdown OTS - 150 - : Over Temperature Hysterisis OTH - 30 - : Vo Temperature Coefficient TC - 30 - ppm/: Short Circuit Current(Note2) ISC VIN=5V, VO<0.8V - 150 300 mA f=1kHz - 50 - f=10kHz - 20 - Power Supply Rejection PSRR VIN=5V Io=100mA Co=2.2f f=100kHz - 15 - dB Output Voltage Noise eN f=10Hz~100kHz Io=10mA C BYP=0F Co=2.2F - 30 - Vrms ADJ Input Bias Current IADJ - 1 - A ADJ Reference Voltage VREF 1.176 1.2 1.224 Ø 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 - - 0.1 A EN Input Bias Current IEL VEN= 0V, VIN=2.7V to 7V - - 0.5 A Shutdown Supply Current ISD VIN=5V, VO=0V, VEN<VEL - 0.5 1 A Shutdown Output Voltage VO,SD Io=35A, VEN<VEL 0 - 0.1 V Output Under Voltage VUV - - 85 %Vo(NOM) Output Over Voltage VOV 115 - - %Vo(NOM) PG Leakage Current ILC VPG=7V - - 1 A PG Voltage Rating VPG VO in regulation - - 7 V PG Voltage Low VOL ISINK=0.4mA - - 0.4 V Note 1: VIN (MIN) =VOUT+VDROPOUT 2: To prevent the Short Circuit Current protection feature from being prematurely activated, the input voltage must be applied before a current source load is applied.

ISSUED DATE :2005/03/16 REVISED DATE : Advanced Application Ordering Information ( contd. ) Part Number Marking Output Voltage Part Number Marking Output Voltage GT2153-AD 3EAD3 XXXX Adjustable Detailed Description The GT2153 of COMS regulators contain a PMOS pass transistor, voltage reference, error amplifier, over-current protection, thermal shutdown and Power Good detection circuitry. 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 300mA. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120:. The GT2153 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress. The GT2153 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. External Capacitors The GT2153 is stable with an output capacitance to ground of 2.2F 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 10F 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 ªQuietº ground termination is desirable. This can be achieved with a ªStarº connection. Enable The Enable pin normally floats high. 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 1A. This pin behaves much like an electronic switch. Power Good The GT2153 includes the Power Good feature. When the output is not within D15% of the specified voltage, it pulls low. This can occur under the following conditions: 1) Input Voltage too low. 2) During Over-Temperature. 3) During Over-Current. 4) If output is pulled up. (Note: PG pin is an open-drain output.)

ISSUED DATE :2005/03/16 REVISED DATE : Characteristics Curve

ISSUED DATE :2005/03/16 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: 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