Bi-CMOS LV5749V 1-channel Step-down Switching Regulator

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Bi-CMOS LV5749V 1-channel Step-down Switching Regulator

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Ordering number ENA1376
Bi-CMOS
LV5749V
1-channel Step-down Switching Regulator
LV5749V 1-channel step-down switching regulator.
Functions
channel step-down switching regulator controller. Load-independent soft start circuit. ON/OFF function. Built-in pulse-by-pulse circuit. detected using resistance external MOS. Synchronous rectification. Current mode control. Synchronous drive external signal.
Specifications
Absolute Maximum Ratings 25°C
Parameter supply voltage Allowable Power dissipation Operating temperature Storage temperature Symbol Topr Tstg Mounted specified board. Conditions Ratings 0.74 +150 Unit
When mounted specified printed circuit board (114.3 76.1 1.6mm), glass epoxy
Recommended Operating Range 25°C
Parameter Supply voltage range Error amplifier input voltage Symbol Conditions Ratings Unit
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.
D2408 20081208-S00002 No.A1376-1/6
LV5749V
Electrical Characteristics 25°C,
Parameter Reference voltage block Internal reference voltage power supply Vref Including offset IOUT 0.654 0.67 0.686 Symbol Conditions Ratings Unit
Triangular waveform oscillator block Oscillation frequency Frequency variation ON/OFF circuit block start-up voltage voltage Soft start circuit block Soft start source current Soft start sink current UVLO circuit block UVLO lock release voltage UVLO hysteresis circuit block charge current Error amplifier Input bias current Error amplifier transconductance Sink output current Source output current Current detection amplifier gain over current limiter circuit block Reference current Reference current Over current detection comparator offset voltage Over current detection comparator common mode input range comparator Input threshold voltage (fosc 125kHz) 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 3.5V IONL IONH RONL RONH DMAX Duty cycle DMAX Duty cycle VIN-0.45 ILIM1 ILIM2 VLIM MODE (GND) MODE (VIN) -10% -10% 18.5 37.0 +10% +10% GISNS 1.0V 1000 1400 -100 1800 IOCP VUVLO VUVLO 3.5V FOSC FOSC 220k
No.A1376-2/6
LV5749V
Package Dimensions
unit (typ) 3178B
0.65 (0.33)
0.15 0.22
1.5max
SANYO SSOP16(225mil)
Assignment
(1.3)
COMP
ILIM
LV5749V
SYNC CBOOT HDRV MODE LDRV
view
No.A1376-3/6
LV5749V
Block Diagram
MODE 1.25V Comp1 Comp2 LOGIC REGULATOR REFERENCE VOLTAGE UVLO
ILIM MODE 18.5A MODE COMP 0.67V
Current DMAX 1.0V 0.5V CONTROL Logic LDRV shut down(SD) SYNC CBOOT HDRV Comp
WAVE OSCILLATOR
Function
name Power supply pin. This monitored UVLO function. When voltage this becomes 7.5V more UVLO function, starts soft start function operates. CBOOT Ground pin. Each reference voltage based voltage ground pin. Power supply external lower MOS-FET gate drive. Bootstrap capacity connection pin. This becomes GATE drive power supply external NchMOSFET. Connect bypath capacitor between CBOOT SYNC LDRV HDRV connect with switching node. source NchMOSFET connects this pin. External synchronous signal input pin. external lower MOSFET gate drive pin. external upper MOSFET gate drive pin. Error amplifier reverse input pin. operating converter, voltage this becomes 0.67V. voltage which output voltage divided external resistance applied this pin. COMP Error amplifier output pin. Connect phase compensation circuit between this GND. connect capacitor soft start. capacitor soft start charged using voltage about This ends soft start period using voltage about 1.1V frequency fold back function becomes active. ILIM Reference current current detection. sink current about 18.5A flows this when level (GND) MODE pin. Also, sink current about flows this when High level (VIN) MODE 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. ON/OFF pin. time timer (during double over current detection point) Connect capacitor between this GND. charge current MODE oscillation frequency. Connect resistance between this GND. switch over current detection point. level (GND) ILIM pin. high level (VIN) pin. When this MODE high level point over current detection using ILIM exceeded, value becomes double original value. Also, when MODE level, point over current detection remains original value. Description
No.A1376-4/6
LV5749V
Timing Chart When MODE high level point over current detection using ILIM exceeded, value becomes double original value. Also, when MODE level, point over current detection remains original value. Timing chart over current detection point switching below.
1.25V over current detection point during High MODE current limit example current limit example
over current detection point during MODE Load Current
Setting Chart Output voltage setting Setting output voltage VOUT follows. VOUT VREF 0.67(typ) Soft Start setting Setting capacitor follows. 0.67 Charge current value. Soft Start time Timer setting Setting timer capacitor follows. Tocp Iocp Tocp Vocp comp1 Iocp Charge current value. Tocp time Current limiter setting Setting current limiter resistance follows. Rdson Rdson Iilim 18.5 Iilim ILIM current value. inductance current value Rdson resistance value between drain-souces.
No.A1376-5/6
LV5749V
Sample Application Circuit
10F/ 0.1F/ 1000pF MCH6406 R100 DSE010 R101 MCH6406 VOUT
SYNC ON/OFF
SYNC MODE COMP
ILIM CBOOT HDRV LDRV
0.1F
1.0k 0.1F
OPEN
OPEN
OPEN
240k
680pF
1.5k
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 December, 2008. Specifications information herein subject change without notice. No.A1376-6/6

Bi-CMOS LV5749V 1-channel Step-down Switching Regulator

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