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PDF LV5749V Data sheet ( Hoja de datos )
| Número de pieza | LV5749V | |
| Descripción | 1-channel Step-down Switching Regulator | |
| Fabricantes | Sanyo Semicon Device | |
| Logotipo |  |
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www.DataSheet.co.kr
Ordering number : ENA1376
LV5749V
Bi-CMOS LSI
1-channel Step-down Switching
Regulator
Overview
The LV5749V is a 1-channel step-down switching regulator.
Functions
• 1 channel step-down switching regulator controller.
• Load-independent soft start circuit.
• ON/OFF function.
• Built-in pulse-by-pulse OCP circuit. It is detected by using ON resistance of an external MOS.
• Synchronous rectification.
• Current mode control.
• Synchronous drive by external signal.
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
supply voltage
Allowable Power dissipation
Operating temperature
Storage temperature
Symbol
VIN max
Pd max
Topr
Tstg
Conditions
Mounted on a specified board. *
* : When mounted on the specified printed circuit board (114.3 × 76.1 × 1.6mm), glass epoxy
Recommended Operating Range at Ta = 25°C
Parameter
Supply voltage range
Error amplifier input voltage
Symbol
VIN
Conditions
Ratings
45
0.74
-40 to +85
-55 to +150
Ratings
8.5 to 42
0 to 1.6
Unit
V
W
°C
°C
Unit
V
V
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to
"standard application", intended for the use as general electronics equipment (home appliances, AV equipment,
communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be
intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace
instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety
equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case
of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee
thereof. If you should intend to use our products for applications outside the standard applications of our
customer who is considering such use and/or outside the scope of our intended standard applications, please
consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our
customer shall be solely responsible for the use.
Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate
the performance, characteristics, and functions of the described products in the independent state, and are not
guarantees of the performance, characteristics, and functions of the described products as mounted in the
customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent
device, the customer should always evaluate and test devices mounted in the customer's products or
equipment.
D2408 MS PC 20081208-S00002 No.A1376-1/6
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
www.DataSheet.co.kr
LV5749V
Timing Chart
When the MODE pin is set to the high level and the point of the over current detection is set by using the ILIM pin is
exceeded, the value becomes double the original value.
Also, when the MODE pin is set to the low level, the point of over current detection remains an original value.
Timing chart of the over current detection point switching is as below.
t
OCP
over current detection point during High MODE
over current detection point during Low MODE
Load Current
1.25V
0V
current limit × 2A
For example 6A
current limit × 1A
For example 3A
Setting Chart
1. Output voltage setting
• Setting of the output voltage VOUT is as follows.
VOUT = 1 +
R4
R3
× VREF = 1 +
R4
R3
× 0.67(typ) [V]
2. Soft Start setting
• Setting of capacitor C5 is as follows.
Iss × Tss 5μ × Tss
C5 = VREF = 0.67 [F]
Iss : Charge current value.
Tss : Soft Start time
3. OCP Timer setting
• Setting of OCP timer capacitor C11 is as follows.
Iocp × Tocp 5μ × Tocp
C11 = Vocp comp1 = 1.3 [F]
Iocp : Charge current value.
Tocp : OCP time
4. Current limiter setting
• Setting of the current limiter set resistance R5 is as follows.
R5 =
Rdson ×Iout
Iilim
=
Rdson × IL max
18.5μ
[Ω]
Iilim : ILIM current value.
IL : inductance current value
Rdson : ON resistance value between Q1 drain-souces.
No.A1376-5/6
Datasheet pdf - http://www.DataSheet4U.net/
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet LV5749V.PDF ] | |
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