FSP3125 Output voltage: 3.3V, adjustable output version Adjustabl

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FSP3125 Output voltage: 3.3V, adjustable output version Adjustabl

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150KHZ BUCK DC/DC CONVERTER
FSP3125
Output voltage: 3.3V, adjustable output version Adjustable version output voltage range, 1.23V 150KHz ±15% fixed switching frequency Voltage mode non-synchronous control Thermal-shutdown current-limit protection ON/OFF shutdown control input Operating voltage Output load current: SOP8L packages power standby mode Built-in switching transistor chip
GENERAL DESCRIPTION
FSP3125 series monolithic designed
Typical Application
Simple High-efficiency step-down regulator On-card switching regulators Positive negative converter
step-down DC/DC converter, ability driving load without additional transistor. saves board space. external shutdown function controlled logic level then come into standby mode. internal compensation makes feedback control having good line load regulation without external design. Regarding protected function, thermal shutdown prevent over temperature operating from damage, current limit against over current operating output switch. current limit function occurs down below 0.5V, switching frequency will reduced. FSP3125 series operates switching frequency 150KHz thus allow smaller sized filter components than what would needed with lower frequency switching regulators. Other features include guaranteed tolerance output voltage under specified input voltage output load conditions, oscillator frequency. output version included fixed 3.3V, 12V, adjustable type. chips available standard SOP8L package.
ASSIGNMENT
(Top View)
OUTPUT
FSP3125
DESCRIPTION
Name OUTPUT Description Operating Voltage Input Switching Output Output Voltage Feedback Control On/Off Shutdown Ground Ground Ground Ground
2007-3-27
150KHZ BUCK DC/DC CONVERTER
FSP3125
ABSOLUTE MAXIMUM RATINGS
Parameter Supply Voltage On/Off Input Voltage Feedback Voltage Output Voltage Ground Power Dissipation Storage Temperature Operating Temperature Operating Voltage Value -0.3 -0.3 Internally Limited +150 +125 +4.5 Unit
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, VIN=12V 3.3V, adjustable version VIN=18V version. ILOAD 0.5A) Parameter Feedback Bias Current Oscillator Frequency Short Circuit Oscillator Frequency Saturation Voltage Maximum Duty Cycle(On) Minimum Duty Cycle(Off) Current Limit Output Leakage Current Output=-1 Quiescent Current Output=0 Standby Quiescent Current ON/OFF Logic Input Threshold Voltage ON/OFF Input Current ON/OFF Logic Input Current Thermal Resistance Thermal Resistance with Copper Area Approximately Symbol Fosc FCSP VSAT When Current Limit Occur 0.5V, TA=25°C IOUT= Outside Circuit force drive force drive =12V force drive Peak Current Outside Circuit force drive Outside Circuit force drive force drive ON/OFF Pin=5V,VIN (Regulator High (Regulator OFF) VLOGIC=0.5V(ON) VLOGIC=2.5V(OFF) SOP8L SOP8L Junction Case Junction Ambient Test Conditions 1.3V (Adjustable Version Only) Min. Typ. 1.25 Max. -100 Unit
ISTBY
2007-3-27
150KHZ BUCK DC/DC CONVERTER
FSP3125
ELECTRICAL CHARACTERISTICS(CONTINUED)
(Unless otherwise specified, VIN=12V 3.3V, adjustable version VIN=18V version. ILOAD 0.5A) Parameter Output Feedback Efficiency Output Feedback Efficiency Output Feedback Efficiency Output Feedback FSP3125-5.0V Symbol FSP3125-ADJ VOUT FSP3125-3.3V VOUT FSP3125-12V VOUT Test Conditions 4.5V 0.2A ILOAD VOUT Programmed =12V, ILOAD= 4.5V 0.2A ILOAD =12V, ILOAD= 0.2A ILOAD =12V, ILOAD= 0.2A ILOAD Min. 1.193 1.18 3.168 3.135 4.75 11.52 5.25 12.48 3.432 3.465 Typ. 1.23 Max. 1.267 1.28 Unit
11.4 12.6 Efficiency =15V, ILOAD= Specifications with boldface full operating temperature range, other type TJ=25°C
FUNCTIONAL BLOCK DIAGRAM
2007-3-27
150KHZ BUCK DC/DC CONVERTER
FSP3125
Function Description
Description +VIN This positive input supply switching regulator. suitable input bypass capacitor must presented this minimize voltage transients supply switching currents needed regulator. Ground Circuit Ground Output Internal Switch. voltage this switches between (+VIN-VSAT) approximately -0.5V, with duty cycle approximately VOUT/VIN. minimize coupling sensitive circuitry, board copper area connected this should minimized. Feedback Sense regulated output voltage complete feedback loop. Allows switching regulator circuit shutdown using logic level signals thus dropping total input supply current approximately 150uA. Pulling this below threshold voltage approximately 1.3V turns regulator pulling this above 1.3V maximum 18V) shuts regulator down. this shutdown feature needed, wired ground pin. Thermal Considerations SOP8L package needs heat sink under most conditions. size heatsink depends input voltage, output voltage, load current ambient temperature. FSP3125 junction temperature rises above ambient temperature load different input output voltages. data these curves taken with FSP3125(SOP8L package) operating buck-switching regulator ambient temperature (still air). These temperature increments approximate affected many factors. Higher ambient temperatures requires more heat sinker. best thermal performance, wide copper traces generous amounts printed circuit board copper should used board layout. (One exception output (switch) pin, which should have large areas copper.) Large areas copper provide best transfer heat (lower thermal resistance) surrounding air, moving lowers thermal resistance even further. Package thermal resistance junction temperature increments approximate. increments affected factors. Some these factors include board size, shape, thickness, position, location, even board temperature. Other factors are, trace width, total printed circuit copper area, copper thickness, single double-sided, multi-layer board amount solder board. effectiveness board dissipate heat also depends size, quantity spacing other components board, well whether surrounding still moving. Furthermore, some these components such catch diode will heat board heat vary input voltage changes. inductor, depending physical size, type core material resistance, could either heat sink taking heat away from board, could heat board.
2007-3-27
150KHZ BUCK DC/DC CONVERTER
FSP3125
Typical Application Circuit
Fixed Output Version Circuit
Adjustable Version Circuit
2007-3-27
150KHZ BUCK DC/DC CONVERTER
FSP3125
TYPICAL CHARACTERISTICS
2007-3-27
150KHZ BUCK DC/DC CONVERTER
FSP3125
TYPICAL CHARACTERISTICS(CONTINUED)
2007-3-27
150KHZ BUCK DC/DC CONVERTER
FSP3125
ORDER INFORMATION
FSP3125XXXX Package: SOP8L Temperature Grade: Output Voltage: Packing: Blank: Tube Bulk -40~125 Blank: Tape Reel 3.3V 5.0V
MARKING INFORMATION
Logo
3125-VV
YYWWXX
Part number: 3125-ADJ: 3125-33: 3.3V 3125-50: 5.0V 3125-12: Internal code Date code: Year (01=2001) week (01~52)
2007-3-27
150KHZ BUCK DC/DC CONVERTER
FSP3125
PACKAGE INFORMATION
7(4)
7(4) 0.01545
VIEW
Symbol
Min. 1.35 0.10 1.35 0.33 0.19 4.80 3.80
Dimensions Millimeters Nom. Max. 1.60 1.75 0.25 1.45 1.55 0.41 0.51 0.20 0.25 4.90 5.00 3.90 4.00 1.27TYP. 5.80 5.99 6.30 0.38 0.71 1.27
Dimensions Inches Min. Nom. 0.053 0.063 0.004 0.053 0.057 0.013 0.016 0.0075 0.008 0.192 0.196 0.148 0.154 0.050TYP. 0.228 0.236 0.015 0.028
Max. 0.069 0.010 0.061 0.020 0.010 0.200 0.160 0.248 0.050
2007-3-27

FSP3125 Output voltage: 3.3V, adjustable output version Adjustabl

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