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GM3326 数据表(PDF) 5 Page - Gamma Microelectronics Inc. |
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GM3326 数据表(HTML) 5 Page - Gamma Microelectronics Inc. |
5 / 7 page 5 ELECTRICAL CHARACTERISTICS (GM3326- 3.3V) Min Typ Max Unit PARAMETER CONDITIONS Min V = 3.3V, F = 300kHz OUT OSC T = 25°C A SYMBOL Output Voltage Supply Voltage Supply Current 1 Supply Current 2 Stand- By Current Oscillation Frequency Max. Duty Ratio PFM Duty Ratio Efficiency Note 1 Soft- Start Time CE 'H' Voltage CE 'L' Voltage EXT/ 'H' ON Resistance EXT/ 'L' ON Resistance VOUT VDD IDD 1 IDD 2 ISTB FOSC MAXDTY PFMDTY EFFI TSS VCEH VCEL REXTBH REXTBL 3.218 2.0 - - - 255 78 15 - 5.0 0.65 - - - 3.300 - 130 20 - 300 85 25 78 10.0 - - 29 19 3.383 10.0 200 35 0.5 345 92 35 - 20.0 - 0.20 43 27 V V µA µA µA KHz % % % mS V V W W VOUT= CE: Set Output Voltage X 0.95 applied VOUT= CE: Set Output Voltage + 0.5 applied VOUT= Set Output Voltage X 0.95 applied, CE= 0V VDD=V = CE: Set Output Voltage X 0.95 applied OUT VDD=V = CE: Set Output Voltage X 0.95 applied OUT No load VDD=V = CE: Set Output Voltage X 0.95 applied IN V : Set Output Voltage X 0.95 applied OUT V : Set Output Voltage X 0.95 applied OUT Same as I 1, V / = V - 0.4V DD EXT OUT Same as I 1, V / = 0.4V DD EXT Measuring Condition: Unless otherwise stated, V = 3.3V, I = 130mA DD OUT Note 1: EFFI= {[(Output Voltage) X (Output Current)] [(Input Voltage) X (Input Current)]} X100 GM3326 is PWM (PWM/ PFM switching) step-up/down DC/DC converter controller ICs. Gm3326 switches to PFM operations during light loads and is very efficient over a wide range in relation to load. Further, the efficiency can be maintained over a wide input voltage range as both step-up & step-down operations are PWM controlled. Output voltage settings are laser trimmed. [ ON TIME] P-Ch MOSFET = ON, N-Ch MOSFET = ON : Current flows from V via Pch MOSEFT, L, Nch FET to GND : L is charged. IN [OFF TIME] P-Ch MOSFET (PSW) = OFF, N-Ch MOSFET (NSW) = OFF : Current flows from GND via Schottky 1, L, Schottky 2, to V : V rises due to the charge stored at L. By comparing V with the internal reference voltage, the ON TIME vs OUT OUT OUT OFF TIME ratio can be regulated & output stability can be protected. OPERATIONAL EXPLANATION CIN + + CL VOUT VIN L Schottky Nch MOSFET CE Pch MOSFET VOUT EXT CE GND VIN <Circuit Connection Example> Schottky |
类似零件编号 - GM3326 |
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类似说明 - GM3326 |
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