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PDF LV5781 Data sheet ( Hoja de datos )
| Número de pieza | LV5781 | |
| Descripción | Step-down Converter | |
| Fabricantes | ON Semiconductor | |
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Hay una vista previa y un enlace de descarga de LV5781 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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Ordering number : ENA0663A
LV5781
Bi-CMOS IC
3A, Point-of-load, Chopper-type
Step-down Converter
http://onsemi.com
Overview
The LV5781 is a 1-channel chopper-type (low-side Schottky diode) step-down switching regulator. It incorporates an
80mΩ (typical) power MOSFET to achieve high-efficiency operation for 3A output currents.
The output voltage is set internally to 3.3V. By adding two external resistors, it is possible to set the voltage to any
desired setting above 0.85V. Inrush current at startup can be prevented by the soft start function.
Using the ON/OFF pins, the converter can be set to standby mode in which the current consumption is 10μA or less.
Both the load and the IC are protected by means of the overcurrent and thermal protection functions. The converter
uses the HSSOP14 miniature package.
Functions
• 3A, 1-channel chopper-type, step-down switching regulator
• Output voltage: 3.3V
• Setting of any output voltage enabled (external resistors required)
• High efficiency: 90% at IOUT=1A, VO=3.3V
• Miniature package: HSSOP14
• Soft start function
• Standby mode
• Overcurrent protection
• Thermal shutdown
• Fixed frequency: 180kHz
Applications
• LCD TVs
• Game machines
Semiconductor Components Industries, LLC, 2013
August, 2013
13107 MS IM 20070112-S00004 No.A0663-1/7
1 page  
Pin Functions
Pin No.
Pin name
1 FB_GND
2 ENABLE
3 SS
4
5, 8, 10
6, 9
7
FB1
VIN
SW
PGND
11 CBOOT
12 OERRAMP
13 FB2
14 FB0
Heat sink fin
GND
LV5781
Description
GND of output voltage setting pins FB0 and FB2. It is connected to GND for use when pin FB2 is used.
Output ON/OFF with an active-high polarity. When set to L, the current consumption is reduced to 10μA or
less.
Soft start time constant setting. The charge current is set to approx. 6.5μA and when a capacitor of 0.1μF is
connected between this pin and GND, the output rises in approx. 12ms.
Test pin for verifying the internal reference voltage. It must be set to open for actual use.
Power input. It is used with voltages ranging from 4.5V to 6V.
Inductor drive output
Power GND pin. This is the output GND. It is connected so that where at all possible, no impedance is
shared with other GND pins (GND, FB_GND).
For generating the gate voltage of the internal high-side n-channel MOS transistor. A capacitor with a
capacitance of at least 0.1μF (max. 2.2μF) is connected between this pin and the SW pin for use.
Transconductance-type Error_Amp output. An integration constant is provided between this pin and GND to
implement phase compensation.
Used to feed back the output voltage to this pin when the output voltage is to be set to 3.3V. In such a case,
FB_GND is connected to GND. Refer to application circuit 1.
When the output voltage is to be set to a desired value, connect resistors between FB0 and GND and
between FB0 and VOUT to feed back the output voltage to this pin. In such a case, leave FB_GND and
FB2 open. Refer to application circuit 2.
Analog GND (connected to GND).
Input Equivalent Circuits
Pin No.
Pin Name
5, 8, 10
GND
VIN
Equivalent Circuit
VIN
1 FB_GND
4 FB1
13 FB2
14 FB0
VIN
FB2
FB1
FB0
FB_GND
GND
GND
116kΩ
50kΩ
118kΩ
54.5kΩ
Continued on next page
No.A0663-5/7
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet LV5781.PDF ] | |
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