Bi-CMOS LV5747TT 1-channel Step-down Switching Regulator

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Bi-CMOS LV5747TT 1-channel Step-down Switching Regulator

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Ordering number ENA1448
Bi-CMOS
LV5747TT
1-channel Step-down Switching Regulator
LV5747TT 1-channel step-down switching regulator.
Functions
channel step-down switching regulator controller. Frequency decrease function pendent. Load-independent soft start circuit. ON/OFF function. Built-in pulse-by-pulse circuit. detected using resistance external MOS.
Specifications
Absolute Maximum Ratings 25°C
Parameter supply voltage VIN, HDRV, CBOOT Allowable voltage LDRV Between CBOOT Between CBOOT HDRV ILIM Between ILIM COMP Allowable Power dissipation Junction temperature Operating temperature Storage temperature Topr Tstg Mounted specified board. VIN+0.3 VDD+0.3 0.75 +150 Symbol Conditions Ratings Unit
Specified board: 35mm 32mm 1.6mm, glass epoxy 2-layer board.
SANYO Semiconductor Co.,Ltd. products described contained herein are, with regard "standard application", intended general electronics equipment (home appliances, equipment, communication device, office equipment, industrial equipment etc.). products mentioned herein shall intended "special application" (medical equipment whose purpose sustain life, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level reliability directly threaten human lives case failure malfunction product cause harm human bodies, shall they grant guarantee thereof. should intend products applications outside standard applications customer considering such and/or outside scope intended standard applications, please consult with prior intended use. there consultation inquiry before intended use, customer shall solely responsible use. Specifications SANYO Semiconductor Co.,Ltd. products described contained herein stipulate performance, characteristics, functions described products independent state, guarantees performance, characteristics, functions described products mounted customer' products equipment. verify symptoms states that cannot evaluated independent device, customer should always evaluate test devices mounted customer' products equipment.
42209 20090402-S00001 No.A1448-1/5
LV5747TT
Recommended Operating Ranges 25°C
Parameter Supply voltage range Error amplifier input voltage Symbol Conditions Ratings Unit
Electrical Characteristics 25°C,
Parameter Reference voltage block Internal reference voltage power supply Vref Including offset IOUT 0.698 0.708 0.718 Symbol Conditions Ratings Unit
Triangular waveform oscillator block Oscillation frequency Frequency variation Oscillation frequency fold back detection voltage Oscillatory frequency after fold back ON/OFF circuit block start-up voltage start-up voltage hysteresis Soft start circuit block Soft start source current Soft start sink current Soft start voltage UVLO circuit block UVLO lock release voltage UVLO hysteresis Error amplifier Input bias current Error amplifier gain Common mode input range Sink output current Source output current Current detection amplifier gain over current limiter circuit block Reference current Over current detection comparator offset voltage Over current detection comparator common mode input range comparator Input threshold voltage Maximum duty Output block Output stage resistance (the upper side) Output stage resistance (the under side) Output stage current (the upper side) Output stage current (the under side) whole device Standby current Mean consumption current ICCS ICCA 4.3V IONL IONH RONL RONH DMAX Duty cycle DMAX, Duty cycle VIN-0.45 ILIM VLIM -10% +10% GISNS 1.0V 1000 -100 1400 1800 µA/V VUVLO VUVLO 4.3V FOSC FOSC FOSC VOSC voltage detection after ends
No.A1448-2/5
LV5747TT
Package Dimensions
unit (typ) 3375
Specified board: glass epoxy 2-layer board.
Allowable power dissipation,
0.75
0.36
(0.25)
(0.85)
0.125
8085
Ambient temperature,
SANYO MSOP12(150mil)
Assignment
COMP ILIM LDRV view
0.08
LV5747TT
CBOOT HDRV
No.A1448-3/5
LV5747TT
Block Diagram
REGULATOR REFERENCE VOLTAGE UVLO
ILIM
20µA
Comp
1.1V
COMP
0.7V
fosc forced
Comp
0.5V
FFOLD Comp
Function
name Description Error amplifier reverse input pin. operating converter, voltage this becomes 0.708V. voltage which output voltage divided external resistance applied this pin. Moreover, when this voltage becomes 0.5V less after soft start ends, frequency fold back function operations, oscillating frequency falling with voltage. COMP CBOOT HDRV LDRV ILIM Error amplifier output pin. Connect phase compensation circuit between this GND. ON/OFF pin. connect with switching node. source NchMOSFET connects this pin. Bootstrap capacity connection pin. This becomes GATE drive power supply external NchMOSFET. Connect bypath capacitor between CBOOT external upper MOSFET gate drive pin. external lower MOSFET gate drive pin. Power supply external lower MOS-FET gate drive. Ground pin. Each reference voltage based voltage ground pin. Power supply pin. This monitored UVLO function. When voltage this becomes 7.8V more UVLO function, starts soft start function operates. Reference current current detection. sink current about 20µA flows this pin. When resistance connected between this outside voltage applied lower than voltage terminal side resistance, upper NchMOSFET operating current limiter comparator. This operation reset with respect each pulse. connect capacitor soft start. capacitor soft start charged using voltage about 5µA. This ends soft start period using voltage about 1.1V frequency fold back function becomes active.
Current WAVE OSCILLATOR
CBOOT HDRV DMAX
1.1V 0.5V
CONTROL Logic
LDRV
shut down(SD)
No.A1448-4/5
LV5747TT
Sample Application Circuit
ILIM CBOOT HDRV
ON/OFF
COMP
LDRV
SANYO Semiconductor Co.,Ltd. assumes responsibility equipment failures that result from using products values that exceed, even momentarily, rated values (such maximum ratings, operating condition ranges, other parameters) listed products specifications SANYO Semiconductor Co.,Ltd. products described contained herein. SANYO Semiconductor Co.,Ltd. strives supply high-quality high-reliability products, however, semiconductor products fail malfunction with some probability. possible that these probabilistic failures malfunction could give rise accidents events that could endanger human lives, trouble that could give rise smoke fire, accidents that could cause damage other property. When designing equipment, adopt safety measures that these kinds accidents events cannot occur. Such measures include limited protective circuits error prevention circuits safe design, redundant design, structural design. event that SANYO Semiconductor Co.,Ltd. products described contained herein controlled under applicable local export control laws regulations, such products require export license from authorities concerned accordance with above law. part this publication reproduced transmitted form means, electronic mechanical, including photocopying recording, information storage retrieval system, otherwise, without prior written consent SANYO Semiconductor Co.,Ltd. information described contained herein subject change without notice product/technology improvement, etc. When designing equipment, refer "Delivery Specification" SANYO Semiconductor Co.,Ltd. product that intend use. Information (including circuit diagrams circuit parameters) herein example only; guaranteed volume production. Upon using technical information products described herein, neither warranty license shall granted with regard intellectual property rights other rights SANYO Semiconductor Co.,Ltd. third party. SANYO Semiconductor Co.,Ltd. shall liable claim suits with regard third party's intellctual property rights which resulted from technical information products mentioned above.
This catalog provides information April, 2009. Specifications information herein subject change without notice. No.A1448-5/5

Bi-CMOS LV5747TT 1-channel Step-down Switching Regulator

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