PWM, PWM/PFM Switching Step-Up Down DC/DC Converter Controller Po

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PWM, PWM/PFM Switching Step-Up Down DC/DC Converter Controller Po

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GM3326
PWM, PWM/PFM Switching Step-Up Down DC/DC Converter Controller
Power Management
GM3326 series step-up/down DC/DC converter controller with fast, resistance drivers built-in. versatile, large output current, step-up/ down DC/DC converter realised using only basic external components transistors, coils, diodes capacitors. Output voltage selectable 0.1V steps within 2.4V 6.0V 2.5% accuracy) range switching frequency 300KHz. GM3326 series switches from control during light loads series offers high efficiencies from light loads through large output currents. Soft-start time internally msec which offers protection against rush currents when power switched also against voltage overshoot. During shutdown consumption current reduced little 0.5µA less.
Features
Input Voltage Range 2.0V Output Voltage Range 2.4V 6.0V 2.5% accuracy) (selectable 0.1V steps) Oscillation Frequency 300KHz accuracy) Output Current more than 250mA (VIN=2.4V, VOUT=3.3V) Efficiency (typ) 5.0V, (typ) 3.3V Stand-By ISTB 0.5µA (max) Output Voltage Internal Set-Up SOT-25 Package
Application Mobile phones PDAs Palmtop computers
TYPICAL APPLICATION CIRCUITS
colis SMTSPR5D5047C-220 Youth coils YCDH57-220
Portable audio equipment Various power supplies
VOUT
MOSFET FDN339AN VOUT GM3326
Schottky MBRS140
100µF/ Chemi_con Series
68µF/ Chemi_con Series
www.gammamicro.com
PRELIMINARY
GM3326
Revision Apr. 2004
Schottky MBRS140
MOSFET FDN338P
GM3326
MARKING INFORMATION CONFIGURATIONS
SOT-25 (SOT-23-5)
VOUT
OAVYW
Device Code Output Voltage Year Work week
ORDERING INFORMATION
Ordering Number
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
Output Voltage
Suffix
Package
SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25
Shipping
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
detail Ordering Number identification, please last page.
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Voltage VOUT Voltage
SYMBOL
VOUT VEXT/ IEXT/ Topr Tstg
RATINGS
-0.3 -0.3 -0.3 -0.3 +0.3 +125
UNITS
GM3326
Voltage EXT/ Voltage EXT/ Current Power Dissipation Operating Ambient Temp. Storage Temp.
GM3326
BLOCK DIAGRAM
VOUT Error Amp.
Phase Compensation
PWM/ Comparator Buffer, Driver EXT/
VRef with Soft Start
PWM/ Controller
Ramp Wave Generator,
Block Diagram Explanation
<Error Amp.> error amplifier used output voltage monitor. compares reference voltage with feedback from voltage divided internal resistor. Should voltage higher than reference voltage fedback, output error will increase. <PWM Comparator> comparator compares output error with ramp wave. When voltage output error low, EXT/ will level (Switching time). <Ramp Wave Generator> ramp wave generator, name suggests, generates switching frequency's ramp wave. <PWM Controller> With GM3326 series, control automatically switched between according size load. <Vref with Soft Start, start Vref voltage error amp's input gradual internal capacitor current circuit. Because this soft-start function, operations error amp's inputs balanced EXT/ pin's time manipulated produce longer times. Further, with UVLO function, signal will such turn switch until instability internal circuit stabilizes during soft-start time. Even cases where input voltage produce instability UVLO function will operate switch will turned OFF.
GM3326
GM3326
[Step-up&down DC/DC Converter] output voltage obtained result automatic switching operations regardless difference between input voltage output voltage.
Efficiency Step-Up Mode IOUT= 10mA Output Voltage +0.4V Step-Down Mode 100mA 200mA
Input Voltage Figure Input Voltage Efficiency
above graph shows that over wide input voltage range, efficiency GM3326 more less constant. applications that either standard cell battery cell lithium battery obtain output 3.3V, example, efficiency GM3326 again much better. Because GM3326 does have series regulator output, recommend test with samples applications where ripple voltage problem.
External Components Selection (Notes)
performance DC/DC converter circuit heavily reliant upon performance surrounding circuitry components. particular, since voltage Schottky Diode used will have direct effect upon efficiency, smaller diode, better efficiency obtainable. (Refer graph below) also recommended that switching MOSFET with small resistance used. With GM3326, resistance 500mW less recommended.
Efficiency
VIN= 2.4V VIN= 3.0V VIN= 4.5V
GM3326
Voltage
Figure VOUT= 3.3V, IOUT= 100mA
GM3326 OPERATIONAL EXPLANATION
Schottky
VOUT
MOSFET
MOSFET
Schottky
VOUT
<Circuit Connection Example> GM3326 (PWM/ switching) step-up/down DC/DC converter controller ICs. GM3326 switches operations during light loads very efficient over wide range relation load. Further, efficiency maintained over wide input voltage range both step-up step-down operations controlled. Output voltage settings laser trimmed. TIME] P-Ch MOSFET N-Ch MOSFET Current flows from MOSEFT, charged.
[OFF TIME]
P-Ch MOSFET (PSW) OFF, N-Ch MOSFET (NSW) Current flows from Schottky Schottky VOUT VOUT rises charge stored comparing VOUT with internal reference voltage, TIME TIME ratio regulated output stability protected.
ELECTRICAL CHARACTERISTICS (GM3326- 3.3V)
VOUT= 3.3V, FOSC= 300kHz 25°C
PARAMETER
Output Voltage Supply Voltage Supply Current Supply Current Stand- Current Oscillation Frequency Max. Duty Ratio Duty Ratio Efficiency
Note
SYMBOL
VOUT ISTB FOSC
CONDITIONS
3.218
3.300 10.0
3.383 10.0 20.0 0.20
Unit
VOUT= Output Voltage 0.95 applied VOUT= Output Voltage applied VOUT= Output Voltage 0.95 applied,
VDD=VOUT= Output Voltage 0.95 applied VOUT: Output Voltage 0.95 applied VOUT: Output Voltage 0.95 applied Same VEXT/ VOUT 0.4V Same VEXT/ 0.4V 0.65
MAXDTY VDD=VOUT= Output Voltage 0.95 applied PFMDTY EFFI VCEH VCEL REXTBH REXTBL load VDD=VIN= Output Voltage 0.95 applied
Soft- Start Time Voltage Voltage EXT/ Resistance EXT/ Resistance
Measuring Condition: Unless otherwise stated, 3.3V, IOUT 130mA Note EFFI= {[(Output Voltage) (Output Current)] [(Input Voltage) (Input Current)]} X100
GM3326
GM3326
SOT-25(SOT-23-5) PACKAGE OUTLINE DIMENSIONS
0.05 0.95 0.038 0.13
Layout
0.35 0.03
0.05 0.65 0.05
0~0.1
0.028
0.094
0.05
0.037 0.095 0.074 0.037 0.095
Inches
1.10
Unit:
ORDERING NUMBER
3326 ST25
Shipping Tape Reel Gamma Micro. Package ST25: SOT-25 Circuit Type Output Voltage 1.5: 1.5V
GM3326

PWM, PWM/PFM Switching Step-Up Down DC/DC Converter Controller Po

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