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PDF RT4813A Data sheet ( Hoja de datos )
| Número de pieza | RT4813A | |
| Descripción | High Efficiency Boost Converter | |
| Fabricantes | Richtek | |
| Logotipo |  |
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RT4813A
High Efficiency Boost Converter
General Description
The RT4813A 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 RT4813A 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 3.25A.
Quiescent current in Shutdown Mode is less than 1A,
which maximizes battery life.
Ordering Information
RT4813A
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
Average Output Current Limit Range : 3250mA
to 2500mA
Internal Compensation
Output Discharge
Output Short Protection
True Load Disconnect
Applications
Single-Cell Li-Ion, LiFePO4 Smart-Phones
Portable Equipment
Marking Information
3XW
3X : 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
VIN
C1
C2
I2C Control
RT4813A
SW VOUT
VIN FB
SCL
SDA
GND
EN
VOUT
R1 C3
R2
EN
R3
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS4813A-00 April 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT4813A
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
Average Output Current
Limit
ILM
2.5 2.85 3.25 A
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.
DS4813A-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
IPCHG
Config 0X01 Default
0
0
01
Read/Write R/W R/W R/W R/W
ILIM_OFF
IPCHG
DRV_SEL<2:0>
SSFM
Boost valley current limit setting
0 : Boost current limit enable (default)
1 : Boost current limit disable
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
RT4813A
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
Reversed
0 00 0
R/W R/W R/W R/W
0
R/W
Soft-start period boost current limit setting. The default current is 1500mA.
Code Current Code Current Code Current Code Current
ILIM_SS<7:4>
0000
0001
1500mA
(default)
1500mA
0100 1500mA 1000 2500mA 1100
0101 1500mA 1001 3000mA 1101
4500mA
5000mA
0010 1500mA 0110 1500mA 1010 3500mA 1110 5500mA
0011 1500mA 0111 2000mA 1011 4000mA 1111 6000mA
Function Register Address
b[7]
(MSB)
b[6]
b[5] b[4] b[3] b[2]
Meaning Reversed Reversed Reversed Reversed
OPTION 0X04
Default
0
0
00
Read/Write R/W R/W R/W R/W
Boost frequency setting.
00 : 2MHz
FSW
01 : Do not allowed
10 : 1MHz
11 : 500kHz (default)
Enable average output current limit
EN_IAVGCL
0 : Disable
1 : Enable (default)
Enable discharge
EN_Discharge
0 : Disable
1 : Enable (default)
FSW
11
R/W R/W
b[1]
b[0]
(LSB)
EN EN
_IAVGCL _Discharge
11
R/W R/W
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS4813A-00 April 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet RT4813A.PDF ] | |
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