GM3326

GM3326 GAMMA | Alldatasheet

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Features

Input Voltage Range : 2.0V ~ 10V Output Voltage Range : 2.4V ~ 6.0V ( ± 2.5% accuracy) (selectable in 0.1V steps) Oscillation Frequency : 300KHz ( ± 15% accuracy) Output Current : more than 250mA (V =2.4V,IN V =3.3V)OUT Efficiency : 81% (typ) at 5.0V, 78% (typ) at 3.3V Stand-By : ISTB = 0.5µA (max) Output Voltage Internal Set-Up GM3326 V0.1 1www.gammamicro.com Portable audio equipment Various power supplies CIN + +CL VOUT VIN 3L colis SMTSPR5D5047C-220 Youth coils YCDH57-220 Nch FDN339AN MOSFET CE Pch MOSFET FDN338P GM3326 VOUT Schottky MBRS140 Schottky MBRS140 EXT VDD GND L 68µF/ 10V Chemi_con PT- Series 100µF/ 10V Chemi_con PT- Series

MARKING INFORMATION & PIN CONFIGURATIONS GM3326 * For detail Ordering Number identification, please see last page. OA: Device Code V : Output Voltage Y : Year W : Weekly OAVYW GND SOT-25 (SOT-23-5) EXT VDD VOUTCE Package Shipping Ordering Number Output V oltage Suffix

ORDERING INFORMATION

3,000 Units/ Tape & Reel 3,000 Units/ Tape & Reel 3,000 Units/ Tape & Reel 3,000 Units/ Tape & Reel 3,000 Units/ Tape & Reel 3,000 Units/ Tape & Reel 3,000 Units/ Tape & Reel 3,000 Units/ Tape & Reel 3,000 Units/ Tape & Reel 3,000 Units/ Tape & Reel GM3326-2.5ST25R GM3326-2.8ST25R GM3326-3.0ST25R GM3326-3.3ST25R GM3326-3.5ST25R GM3326-4.0ST25R GM3326-4.5ST25R GM3326-5.0ST25R GM3326-5.5ST25R GM3326-6.0ST25R 2.5 2.8 3.0 3.3 3.5 4.0 4.5 5.0 5.5 6.0 B E G J L Q V A F K ABSOLUTE MAXIMUM RATINGS PARAMETER UNITS V Pin VoltageDD V Pin VoltageOUT CE Pin Voltage EXT/ Pin Voltage EXT/ Pin Current Power Dissipation Operating Ambient Temp. Storage Temp. V V V V mW SYMBOL V DD VOUT VCE VEXT/ IEXT/ Pd Topr Tstg RATINGS -0.3 ~ 12 -0.3 ~ 12 -0.3 ~ 12 -0.3 ~ V +0.3DD ± 100 150 -40 ~ +85 -40 ~ +125 mA

Error Amp. Phase Compensation V with Ref Soft Start CE PWM/ PFM Controller PWM/ PFM Comparator Ramp Wave Generator, OSC Buffer, Driver VDD EXT/ GND Block Diagram Explanation <Error Amp.> The error amplifier is used as an output voltage monitor. It compares the reference voltage with the feedback from the voltage divided by the internal resistor. Should a voltage higher than the reference voltage be fedback, the output of the error amp will increase. <PWM Comparator> The PWM comparator compares the output of the error amp with the ramp wave. When the voltage at the output of the error amp is low, the EXT/ pin will be LOW level (Switching ON time). <Ramp Wave Generator> The ramp wave generator, as the name suggests, generates the switching frequency's ramp wave. <PWM / PFM Controller> With the GM3326 series, control is automatically switched between PWM and PFM according to the size of the load. <Vref with Soft Start, CE> The start up of the Vref voltage at the error amp's input is gradual due to the internal capacitor and low current circuit. Because of this soft-start function, the operations of the error amp's 2 inputs are balanced and the EXT/ pin's ON time can be manipulated to produce longer ON times. Further, with the UVLO function, the signal will be such so as not to turn the MOS switch ON until any instability in the internal circuit stabilizes during soft-start time. Even in cases where input voltage is so low as to produce instability in the IC, the UVLO function will operate and the MOS switch will be turned OFF.

ELECTRICAL CHARACTERISTICS (GM3326- 3.3V) Min Typ Max Unit PARAMETER CONDITIONS Min V = 3.3V, F = 300kHzOUT OSC T = 25°CA 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 5.0 0.65 3.300 130 300 10.0 3.383 10.0 200 0.5 345 20.0 0.20 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 appliedOUT VDD=V = CE: Set Output Voltage X 0.95 appliedOUT No load VDD=V = CE: Set Output Voltage X 0.95 appliedIN V : Set Output Voltage X 0.95 appliedOUT V : Set Output Voltage X 0.95 appliedOUT Same as I 1, V / = V - 0.4VDD EXT OUT Same as I 1, V / = 0.4VDD EXT Measuring Condition: Unless otherwise stated, V = 3.3V, I = 130mADD 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 LSchottky Nch MOSFET CE Pch MOSFET VOUT EXT CE GND VIN <Circuit Connection Example> Schottky

GM 3326 2.5 ST25 R Gamma Micro. Circuit Type Package ST25: SOT-25 Shipping R: Tape & Reel SOT-25(SOT -23-5) P ACKAGE OUTLINE DIMENSIONS Pad Layout 2.9 ± 0.1 0.074 1.9 0.037 0.95 0.037 0.95 0.094 2.4 0.028 0.7 Inches mm ( ) 1.9 ± 0.05 2.8 ± 0.1 1.5 ± 0.05 0.65 ± 0.05 0.35 ± 0.03 0.13 0~0.1 0.8 ± 0.05 1.10 ± 0.1 5° 5° Unit: mm Output Voltage 1.5: 1.5V 0.039 1.0 0.95 ± 0.038