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ST735CD-ST735CD-TR
-5V INVERTING NEGATIVE OUTPUT CURRENT MODE PWM REGULATOR
1/9August 2002 CONVERTS +4.0VTO+ 6.2V INPUTTO-5V
OUTPUT 1W GUARANTEED OUTPUT POWER 75% TYPICAL EFFICIENCY 0.8mA QUIESCENT CURRENT 10μA SHUTDOWN MODE 160KHZ FIXED FREQUENCY OSCILLATOR CURRENT MODE PWM CONVERTER LOW NOISE AND JITTER SOFT START SIMPLE APPLICATION CIRCUIT UNDERVOLTAGE LOCKOUT
DESCRIPTIONThe ST735isa Bi-CMOS, inverting switch mode
DC-DC regulator with internal Power MOSFET's
that generatesa fixed -5V output voltage fromato 6.2V input voltage;is guaranteedan output
currentof 200mAfor inputs greater than 4.5V. The
quiescent currentfor this deviceis typicallyof
0.8mA and,in shutdown modeitis reducedto
10μA.
These power-conserving features, along with high
efficiency and applications circuits, that lend itself minaturization, makethe ST735 excellentina
broad rangeof on-card, HDD and portable
equipment applications. The ST735 employa
high performance current mode pulse with
modulation (PWM) control schemeto provide tight
output voltage regulation and low noise. The
fixed frequency oscillatoris factory trimmedto
160KHz, allowingfor easy noise filtering. The
regulatorin productionis testedto guaranteean
output accuracy within ±5% overall specified
conditions.
ST735-5V INVERTING, NEGATIVE OUTPUT
CURRENT-MODE PWM REGULATOR
SCHEMATIC DIAGRAM
ST7352/9
ABSOLUTE MAXIMUM RATINGSAbsoluteMaximum Ratingsare those values beyond which damagetothe devicemay occur. Functional operation under these conditionis
not implied.
THERMAL DATA
CONNECTION DIAGRAM (top view)
PIN DESCRIPTION
ST7353/9
ORDERING CODES
TYPICAL APPLICATION CIRCUITNOTE:All capacitorsareX7R ceramicC5canbe omittedifareused higher valuesfortheinputand output capacitors C2=47μF, C1=100pF.
ST7354/9
ELECTRICAL CHARACTERISTICS (Referto test circuit,VIN =5V,CIN =4.7μF,COUT =10μF,L= 10μH,
Tamb=-40to 125°C, unless otherwise specified. Typical valueare referredat Tamb= 25°C)
Note1: Testedat IVREF =0mA
ST7355/9
TYPICALCHARACTERISTICS (Referredto typical application circuit,Tamb =25°C unless otherwise specified)
Figure1: Output Voltagevs Temperature
Figure2: Reference Voltagevs Temperature
Figure3: Oscillator Frequencyvs Temperature
Figure4: EfficencyvsTemperature
Figure5: Efficencyvs Ouput Current
Figure6: Supply Currentvs Temperature
ST7356/9
Figure7: Supply Currentvs Input Voltage
Figure8: Shutdown Thresholdvs Temperature
Figure9: Peak Inductor Currentvs Output
Current
Figure10: Switch Current Limitvs Soft Start
Voltage
Figure11:LXOn Resistancevs Temperature
Figure12:LXOn Resistancevs Input Voltage
