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PDF RT4813 Data sheet ( Hoja de datos )
| Número de pieza | RT4813 | |
| Descripción | High Efficiency Boost Converter | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT4813 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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RT4813
High Efficiency Boost Converter
General Description
The RT4813 allows systems to take advantage of new
battery chemistries that can supply significant energy
when the battery voltage is lower than the required
voltage for system power ICs. By combining built-in
power transistors, synchronous rectification, and low
supply current; this IC provides a compact solution for
systems using advanced Li-Ion battery chemistries.
The RT4813 is a boost regulator designed to provide a
minimum output voltage from a single-cell Li-Ion battery,
even when the battery voltage is below system
minimum. In boost mode, output voltage regulation is
guaranteed to a maximum load current of 3.1A.
Quiescent current in Shutdown Mode is less than 1A,
which maximizes battery life.
Ordering Information
RT4813
Package Type
QUF : UQFN-9L 2x2 (FC) (U-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Features
CMCOT Topology and Small Output Ripple when
VIN Close VOUT Voltage
Operates from a Single Li-ion Cell : 1.8V to 5.5V
Adjustable Output Voltage : 1.8V to 5.5V
PSM Operation
Up to 96% Efficiency
Input Over Current Limit
Input / Output Over Voltage Protection
Programmable Average Output Current Limit
Range : 3100mA to 1225mA
Internal Compensation
Output Discharge
Output Short Protection
True Load Disconnect
Applications
Single-Cell Li-Ion, LiFePO4 Smart-Phones
Portable Equipment
Marking Information
3VW
3V : Product Code
W : Date Code
Note :
Richtek products are :
RoHS compliant and compatible with the current
requirements of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering
processes.
Simplified Application Circuit
L1 RT4813
VIN SW VOUT
C1
VIN
C2
FB
I2C Control
SCL
SDA
GND
EN
VOUT
R1 C3
R2
EN
R3
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS4813-00 April 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT4813
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Line Regulation
Load Regulation
Output Over Voltage
Protection
VOUT, LINE
VOUT, LOAD
CCM, VIN = 2.7V to 4.5V,
VOUT = 5V, IOUT = 500mA
CCM, IOUT < 3.1A, VIN = 3.6V,
VOUT = 5V
VOVP
-- 0.5 -- %
-- 0.5 -- %
-- 6 -- V
EN Input
Voltage
Low-Level VIL
High-Level VIH
-- -- 0.4 V
1.2 -- -- V
EN Sink Current
-- 0.1 1 A
Thermal Shutdown
TSD
-- 160
C
Thermal Shutdown
Hysteresis
TSD
-- 30
C
Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may affect
device reliability.
Note 2. JA is measured at TA = 25C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. JC is
measured at the exposed pad of the package.
Note 3. Devices are ESD sensitive. Handling precaution recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS4813-00 April 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
I2C Register
Function Register Address
b[7]
(MSB)
b[6]
b[5] b[4]
Meaning Reversed ILIM_OFF
Config 0X01 Default
0
0
IPCHG
01
Read/Write R/W R/W R/W R/W
ILIM_OFF
Boost valley current limit setting
0 : Boost current limit enable (default)
1 : Boost current limit disable
IPCHG
DRV_SEL<2:0>
SSFM
Pre-charge current setting.
00 : 0.5A
01 : 1A (default)
10 : 1.5A
11 : 2A
LG driver driving capability
000 : Slowest
:
:
111 : Fastest (default)
Spread spectrum setting.
0 : Spread spectrum disable (default)
1 : Spread spectrum enable
RT4813
b[3] b[2] b[1]
DRV_SEL<2:0>
11
1
R/W R/W R/W
b[0]
(LSB)
SSFM
0
R/W
Function Register Address
b[7]
(MSB)
b[6]
b[5]
b[4] b[3] b[2] b[1]
b[0]
(LSB)
Meaning
Charger
Control 3
0X03
Default
Read/Write
0
R/W
ILIM_SS<7:4>
00
R/W R/W
ILIM_AVG<3:0>
0 00 0
0
R/W R/W R/W R/W
R/W
Soft-start period boost current limit setting. The default current is 1500mA.
ILIM_SS<7:4>
Code
0000
0001
Current
1500mA
(default)
1500mA
Code
0100
0101
Current Code Current
1500mA 1000 2500mA
1500mA 1001 3000mA
Code
1100
1101
Current
4500mA
5000mA
0010 1500mA 0110 1500mA 1010 3500mA 1110 5500mA
0011 1500mA 0111 2000mA 1011 4000mA 1111 6000mA
Average Output Current limit setting. The default current is 3000mA.
ILIM_AVG<3:0>
Code
0000
0001
Current
3100mA
(Default)
2930mA
Code
0100
0101
Current Code Current
2420mA 1000 1740mA
2250mA 1001 1570mA
Code
1100
1101
Current
1060mA
890mA
0010 2760mA 0110 2080mA 1010 1400mA 1110 720mA
0011 2590mA 0111 1910mA 1011 1230mA 1111 550mA
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS4813-00 April 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet RT4813.PDF ] | |
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