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| Global Mixed-mode Technology Inc. G961 1A Low Dropout Regulator with Enable Features Adjustable Output from 1.2V to 4.8V Using External Resistors 1.5V, 1.8V and 2.5V Options by Setting ADJ Pin Below 0.2V Over current and over temperature protection 400mV dropout @1A Enable pin 10A quiescent current in shutdown SOT-89-5 Package General Description The G961 is a high performance positive voltage regulator designed for use in applications requiring very low dropout voltage at up to 1 Amps. Since it has superior dropout characteristics compared to regular LDOs, it can be used to supply 2.5V on motherboards or 1.5V, 1.8V on peripheral cards from the 3.3V supply thus allowing the elimination of costly heatsinks. An enable pin further reduces power dissipation while shut down. The G961 provides excellent regulation over variations in line, load and temperature. The SOT-89-5 is available with 1.5V, 1.8V and 2.5V internally preset outputs that are also adjustable using external resistors. Applications Battery powered systems Motherboards Peripheral cards Network cards Set Top Boxes Medical Equipment Notebook Computers Ordering Information ORDER NUMBER G961-15ADJTEU G961-18ADJTEU G961-25ADJTEU ORDER NUMBER (Pb free) G961-15ADJTEUf G961-18ADJTEUf G961-25ADJTEUF MARKING 961-15 961-18 961-25 TEMP. RANGE -40C ~ +85C -40C ~ +85C -40C ~ +85C PACKAGE SOT-89-5 SOT-89-5 SOT-89-5 Note: TE: SOT-89-5 U : Tape & Reel e.g. 18 denotes the 1.8V output voltage. Pin Configuration Typical Application Circuit R3 IENH G961 VEN VIN VO GND G961 VIN 5 VEN 4 VEN VIN VO R1 C1 22F C2 47F R2 ADJ 1 ADJ 2 GND 3 VO Volts R2 R2=12k is recommended VO = R3 should be connected for current IENH restriction as VEN > VIN+0.3V 1.2 (R1+R2) SOT-89-5 Ver: 1.2 Apr 01, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 1 Global Mixed-mode Technology Inc. Absolute Maximum Ratings (Note 1) Input Voltage.....................................................7V VEN Voltage..............................................VIN+0.3V Power Dissipation Internally Limited (Note 2) Maximum Junction Temperature.....................150C Storage Temperature Range........-65C TJ +150C Reflow Temperature (soldering, 10sec)............260C Thermal Resistance Junction to Ambient, (JA) SOT-89-5................................................128C/W Thermal Resistance Junction to Case, (Jc) SOT-89-5.................................................19C/W ESD Rating (Human Body Model).......................2kV Electrical Characteristics G961 Operation Conditions (Note 1) Input Voltage........................................2.2V ~5.5V Temperature Range......................-40C TA +85C VEN=VIN, VIN =5V, IO = 0.5A, CIN = 4.7F, COUT =10F, TA = TJ = 25C unless otherwise specified (Note 3) PARAMETER Supply Voltage Output Voltage Line Regulation Load Regulation Quiescent Current Ripple Rejection Dropout Voltage Short Circuit Current Over Temperature VEN Voltage High VEN Voltage Low VEN Bias Current Low ADJ Reference Voltage ADJ Pin Threshold VD IQ SYMBOL VIN VO CONDITION VIN=VO +0.7V, IO=10mA VO+0.7V < VIN < 5.5V, IO=10mA 10mA < IO < 1A VIN=3.3V,VEN=VIN VIN=3.3V,VEN=0V fi=120Hz, 1VP-P, IO=100mA IO=1A MIN 2.2 -2 ----------------1.6 ----1.188 --- TYP --VO 0.2 0.8 1.7 16 55 0.4 0.8 150 ------1.2 0.2 MAX 5.5 2 2 2 2.5 35 --0.6 ------0.4 20 1.212 --- UNIT V % % % mA A dB V A C V V A V V VENH VENL IENL VREF Output Active Output Disabled VEN=0.4V VIN=2.2V, VADJ=VOUT, IO=10mA Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Conditions are conditions under which the device functions but the specifications might not be guaranteed. For guaranteed specifications and test conditions see the Electrical Characteristics. Note2: The maximum power dissipation is a function of the maximum junction temperature, TJmax; total thermal resistance, JA, and ambient temperature TA. The maximum allowable power dissipation at any ambient temperature is (Tjmax-TA) / JA. If this dissipation is exceeded, the die temperature will rise above 150C and IC will go into thermal shutdown. Note3: Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible. Note4: The type of output capacitor should be tantalum or aluminum. Definitions Dropout Voltage The input/output Voltage differential at which the regulator output no longer maintains regulation against further reductions in input voltage. Measured when the output drops 2% below its nominal value, dropout voltage is affected by junction temperature, load current and minimum input supply requirements. Line Regulation The change in output voltage for a change in input voltage. The measurement is made under conditions of low dissipation or by using pulse techniques such that average chip temperature is not significantly affected. Load Regulation The change in output voltage for a change in load current at constant chip temperature. The measurement is made under conditions of low dissipation or by using pulse techniques such that average chip temperature is not significantly affected. Maximum Power Dissipation The maximum total device dissipation for which the regulator will operate within specifications. Quiescent Bias Current Current which is used to operate the regulator chip and is not delivered to the load. Ver: 1.2 Apr 01, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 2 Global Mixed-mode Technology Inc. Typical Performance Characteristics VEN=VIN, VIN =5V, IO = 0.5A, CIN = 4.7F, COUT =10F, TA = TJ = 25C (VOUT=1.8V) G961 Load Transient Response Line Transient Response Short Circuit Current 60 50 Ripple Rejection (dB) 40 30 20 10 0 10 100 Ripple Rejection IL=10mA IL=1A IL=500mA VIN=4V COUT=10F Vripple=224mV 1000 10000 100000 1000000 Frequency (Hz) Overcurrent Protection Characteristics Start-up Ver: 1.2 Apr 01, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 3 Global Mixed-mode Technology Inc. Typical Performance Characteristics (Continued) G961 Dropout Voltage vs. IL Quiescent Current vs. Temperature 2.00 1.95 Quiescent Current (mA) Dropout Voltage (mV) 1.90 1.85 1.80 1.75 1.70 1.65 1.60 1.55 1.50 -25 -15 -5 5 15 25 35 45 55 65 75 85 VIN=3.0V VIN=5.0V 700 600 500 400 300 200 100 0 0 T=85C T=25C T=-25C 200 Temperature (C) 400 600 IL (mA) 800 1000 Output Voltage vs. Temperature 1.824 1.819 Output Voltage (V) VIN=5.0V Output Voltage vs. VIN 1.825 1.82 Output Voltage (V) 1.815 1.81 1.805 T=-25C IL=10mA T=85C T=25C 1.814 1.809 1.804 1.799 1.794 1.789 1.784 -25 -15 -5 VIN=3.0V 1.8 5 15 25 35 45 55 65 75 85 Temperature (C) 2.5 3.5 4.5 5.5 VIN (V) 6.5 SOT-89-5 Max. Power Dissipation vs. PCB Top Copper Area TAMB = 25C ; Still Air 2.5 Max. Dissipation Power (W) Max. Dissipation Power (W) 2 1.5 1 0.5 0 0.5 1.5 2.5 3.5 4.5 PCB Top Copper Area (in2) 3 2.5 2 1.5 1 0.5 0 25 SOT-89-5 Max. Power Dissipation vs. TAMB (still air) ( Different PCB Top Copper Area ) Unit:in2 A=0.5 A=1.0 A=1.5 A=2.0 A=2.5 A=3.0 A=3.5 A=4.0 A=4.5 A=5.0 45 TAMB (C) 65 85 Ver: 1.2 Apr 01, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 4 Global Mixed-mode Technology Inc. Recommended Minimum Footprint SOT-89-5 G961 Ver: 1.2 Apr 01, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 5 Global Mixed-mode Technology Inc. Package Information A C D F L B G961 E I H G J K SOT-89-5 Package SYMBOL A B C D E F G H I J K L DIMENSION IN MM MIN MAX 4.40 4.05 1.50 1.30 2.40 0.80 3.00 REF 1.50 REF 0.40 1.40 0.35 5 TYP 0.52 1.60 0.41 4.60 4.25 1.70 1.50 2.60 ----- DIMENSION IN INCH MIN MAX 0.173 0.159 0.059 0.051 0.094 0.031 0.118 REF 0.059 REF 0.016 0.055 0.014 5 TYP 0.020 0.063 0.016 0.181 0.167 0.067 0.059 0.102 ----- Taping Specification PACKAGE SOT-89-5 Feed Direction SOT-89-5 Package Orientation Q'TY/REEL 1,000 ea GMT Inc. does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and GMT Inc. reserves the right at any time without notice to change said circuitry and specifications. Ver: 1.2 Apr 01, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 6 |
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