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PDF RT8540A Data sheet ( Hoja de datos )
| Número de pieza | RT8540A | |
| Descripción | High Power Synchronous Boost Converter | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8540A (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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®
RT8540A
High Power Synchronous Boost Converter
General Description
The RT8540A is a high-efficiency, high-current Boost
converter in all single-cell Lithium-ion / polymer battery
operated products. The RT8540A maintains output current
regulation by switching the internal high side and low side
switch transistors. The transistor switches are pulse-width
modulated at a fixed frequency of 2MHz. The high switching
frequency allows the use of a small inductor and output
capacitor, making the RT8540A ideally suited for small
battery-powered applications. Output voltage can be set
by an external resistor on the FB pin or by I2C interface.
The RT8540A contains over voltage protection, over current
protection and over temperature protection to prevent the
device from output open circuit or short circuit condition.
Built-in soft-start circuitry prevents excessive inrush current
during start-up. The shutdown feature reduces quiescent
current to less than 5μA.
Marking Information
0R= : Product Code
0R=YM
DNN
YMDNN : Date Code
Features
z Input Voltage Range : 2.8V to 5.5V
z True Load Disconnect
z Internal Synchronous Rectifier
z Up to 90% Efficiency with Small Magnetics
z Current Mode PWM Operation with Internal
Compensation
z Internal Soft-Start Control
z Flexible on/off Control by I2C or EN.
z Short Circuit Protection
z Input Current Limit up to 4A
z Over Voltage, Over Temperature Protection
z Shutdown Current : 2μA
z −40°C to 85°C Temperature Range
z 20-Lead WQFN Package
z RoHS Compliant and Halogen Free
Applications
z Cellular Phones
z Digital Cameras
z Probable Instruments
Simplified Application Circuit
VBAT
L
CIN1
SW VOUT
VIN RT8540A
SELECT
SCL
SDA
PGND
VOUT
COUT
I2C Interface
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8540A-00 June 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT8540A
Parameter
Symbol
Test Conditions
Min
Protection Function
N-MOSFET Current Limit
Over Voltage Protection
IOCP
VOVP
VOUT = 5V
3.6
VOUT Rising, 0000 ≤ OV[3:0] ≤ 0100 4.464
VOUT Rising, 0101 ≤ OV[3:0] ≤ 1111,
SELECT = LOW
5.568
OVP Hysteresis
VOVP_HYS VOUT Falling
Thermal Shutdown
TSD
Thermal Shutdown Hysteresis TSD_HYS
Logic Control
--
--
--
SELECT Logic High
SELECT Logic Low
EN Logic High
EN Logic Low
SCL Logic High
SCL Logic Low
SDA Logic High
SDA Logic Low
GPIO Output Voltage High
VSELH
VSELL
VENLH
VENLL
VSCLH
VSCLL
VSDAH
VSDAL
VOH_GPIO DIR = 1, GPIOTYPE = 0, IOH = 8mA
1.4
--
1.4
--
1.4
--
1.4
--
VIN
− 0.4
GPIO Output Voltage Low
VOL_GPIO
EN Pull Low Resistance
REN
SELECT Pull Low Resistance RSEL
Clock Frequency of SCL
fSCL
DIR = 1, IOL = 5mA
--
--
--
--
Typ
4
4.65
5.8
150
160
20
--
--
--
--
--
--
--
--
--
--
400
400
--
Max
4.4
4.836
6.032
--
--
--
--
0.4
--
0.4
--
0.4
--
0.4
--
0.3
--
--
400
Unit
A
V
V
mV
°C
°C
V
V
V
V
V
V
V
V
V
V
kΩ
kΩ
kHz
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. θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is
measured at the exposed pad of the package.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8540A-00 June 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
Table 3. 0x06 Output Voltage
Description ENVM
FREE
Bits D7 D6 D5 D4 D3
Memory
R/W
R
R
R R/W
Default
0
0
0
0
1
OV[3:0]
Output Voltage Selection bits for I2C Control :
0000 : 3.825V
0001 : 3.95V
0010 : 4.075V
0011 : 4.2V
0100 : 4.325V
0101 : 4.45V
0110 : 4.575V
0111 : 4.7V
1000 : 4.825V
1001 : 4.95V
1010 : 5.075V
1011 : 5.2V
1100 : 5.325V
1101 to 1111 : 5.45V
ENVM
Enable Voltage Mode bit.
0 : Shutdown mode.
1 : Normal operation.
RT8540A
OV [3:0]
D2 D1
R/W R/W
00
D0
R/W
1
Register Summary
Address : 0110011x
Register Description PG
FREE
0x04
0x05
0x06
Bits
Memory
Default
Description
Bits
Memory
Default
Description
Bits
Memory
Default
Bit7
R/W
0
RESET
Bit7
0
R/W
ENVM
Bit7
R/W
0
Bit6
R
0
ENPSM
Bit6
1
R/W
Bit6
R
0
OTP
Bit5
R
0
DIR
Bit5
1
R/W
FREE
Bit5
R
0
FREE
Bit4
R
0
GPIO
Bit4
0
R/W
Bit4
R
0
FREE
Bit3
R
0
GPIOTYPE
Bit3
1
R/W
Bit3
R/W
1
Vout
Short
Bit2
FREE
Bit1 Bit0
RRR
000
FREE
Bit2 Bit1 Bit0
000
RRR
OV [3:0]
Bit2 Bit1 Bit0
R/W R/W R/W
001
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8540A-00 June 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet RT8540A.PDF ] | |
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