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PDF LV5749NV Data sheet ( Hoja de datos )
| Número de pieza | LV5749NV | |
| Descripción | 1-channel Step-down Switching Regulator | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Ordering number : ENA1684
LV5749NV
Bi-CMOS LSI
1-channel Step-down
Switching Regulator
http://onsemi.com
Application
The LV5749NV 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 (114.3mm × 76.1mm × 1.6mm), glass epoxy
Ratings
45
0.74
-40 to +85
-55 to +150
Unit
V
W
°C
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Recommended Operating Range at Ta = 25°C
Parameter
Supply voltage range
Error amplifier input voltage
Symbol
VIN
Conditions
Ratings
8.5 to 42
0 to 1.6
Unit
V
V
Semiconductor Components Industries, LLC, 2013
August, 2013
82510 SY 20100312-S00001 No.A1684-1/6
1 page  
LV5749NV
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.A1684-5/6
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet LV5749NV.PDF ] | |
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