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PDF LV5769V Data sheet ( Hoja de datos )
| Número de pieza | LV5769V | |
| Descripción | 1-channel Step-down Switching Regulator | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Ordering number : ENA1920A
LV5769V
Bi-CMOS IC
1-channel Step-down
Switching Regulator
http://onsemi.com
Overview
The LV5769V is a 1-channel step-down switching regulator.
Function
• 1 channel step-down switching regulator controller.
• Frequency decrease function at pendent.
• 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
SSOP16(225mil)
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Symbol
Supply voltage
VIN max
VIN, SW
HDRV, CBOOT
Conditions
LDRV
Between CBOOT to SW
Between CBOOT to HDRV
EN, ILIM
Between VIN to ILIM
VDD
SS, FB, COMP,RT
Allowable Power dissipation
Pd max
Mounted on a specified board. *
Operating temperature
Topr
Storage temperature
Tstg
* Specified board : 114.3mm × 76.1mm × 1.6mm, glass epoxy board.
Ratings
45
45
52
6.0
6.0
VIN+0.3
1.0
6.0
VDD+0.3
0.74
-40 to +85
-55 to +150
Unit
V
V
V
V
V
V
V
V
V
W
°C
°C
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed,
damage may occur and reliability may be affected.
ORDERING INFORMATION
See detailed ordering and shipping information on page 9 of this data sheet.
Semiconductor Components Industries, LLC, 2014
March, 2014
30614NK/20911SY 20110121-S00005,S00006 No.A1920-1/9
1 page  
Block Diagram
LV5769V
VIN 14
5V 5V REFERENCE
REGULATOR
VOLTAGE
TSD
VIN UVLO
VDD UVLO
ILIM 15
1.1V
SD
-
+
OCP Comp
SQ
R
VIN +
-
Current
+
- SD
SQ
R
Amp
DMAX = 90%1.0V
SAW WAVE
0.5V
OSCILLATOR
fosc forcec
1/3
-
+
PWM Comp
+
-
SS 16
FB 1
0.67V
++
-
SS Amp
Err
COMP 2
Amp
1.2V
RT 4
0.1V
+
-
0.1V
+
- FFOLD
Amp
7 CBOOT
8 HDRV
CONTROL
Logic
6 SW
5V
10 VDD
9 LDRV
shut down(SD)
11 GND
3
EN
Pin Function
Pin No. Pin name
Description
1 FB
Error amplifier reverse input pin. By operating the converter, the voltage of this pin becomes 0.67V.
The voltage in which the output voltage is divided by an external resistance is applied to this pin. Moreover, when this pin
voltage becomes 0.1V or less after a soft start ends, the oscillatory frequency becomes 1/3.
2 COMP
Error amplifier output pin. Connect a phase compensation circuit between this pin and GND.
3 EN
ON/OFF pin.
4 RT
Oscillation frequency setting pin. Resistance is connected with this pin between GND.
5,13 N.C.
No connection *2
6 SW
Pin to connect with switching node. Upper part NchMOSFET external a source is connected with lower side NchMOSFET
external a drain.
7
CBOOT
Bootstrap capacity connection pin. This pin becomes a GATE drive power supply of an external NchMOSFET.
Connect a bypath capacitor between CBOOT and SW.
8 HDRV
An external the upper MOSFET gate drive pin.
9 LDRV
An external the lower MOSFET gate drive pin.
10 VDD
11 GND
Power supply pin for an external the lower MOS-FET gate drive.
Ground pin. Each reference voltage is based on the voltage of the ground pin.
12 SUBGND It is connected with the GND pin of 11pin internally. *3
14 VIN
Power supply pin. This pin is monitored by UVLO function. When the voltage of this pin becomes 8V or more by UVLO function,
The IC starts and the soft start function operates.
15 ILIM
Reference current pin for current detection. The sink current of about 18.5μA flows to this pin.
When a resistance is connected between this pin and VIN outside and the voltage applied to the SW pin is lower than the
voltage of the terminal side of the resistance, the upper NchMOSFET is off by operating the current limiter comparator.
This operation is reset with respect to each PWM pulse.
16 SS
Pin to connect a capacitor for soft start. A capacitor for soft start is charged by using the voltage of about 5μA.
This pin ends the soft start period by using the voltage of about 1.1V and the frequency fold back function becomes active.
*2: There is no problem even if it connects it with GND.
*3: Short-circuited and use 11pin and 12pin as GND.
No.A1920-5/9
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet LV5769V.PDF ] | |
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