|
|
PDF RT8023 Data sheet ( Hoja de datos )
| Número de pieza | RT8023 | |
| Descripción | 1.2MHz 1.5A Synchronous Step-Down Converter | |
| Fabricantes | Richtek | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de RT8023 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
|
No Preview Available !
RT8023
1.2MHz 1.5A Synchronous Step-Down Converter
with Two LDOs
General Description
The RT8023 combines two low dropout (LDO) linear
regulators and a step-down converter with an input voltage
range of 2.6V to 5.5V. Each output voltage is adjustable
from 0.8V to 5V. With independent Enable and Power-
Good pins for each regulator, it is easy to control the power
up sequence, which is important in some applications.
The LDO has an independent input and is capable of
delivering up to 700mA(LDO1) and 350mA(LDO2) output
currents with ultra-low dropout. The LDO has high PSRR
and can work with low-ESR space saving ceramic
capacitors. All these make it Ideal for portable RF and
wireless applications with demanding performance and
space requirements. Other features include high output
accuracy, current limiting protection, and 40μs fast turn-
on time.
The step-down converter is a 1.2MHz PWM, current mode
converter. Its high switching frequency allows the use of
tiny, low cost capacitors and inductors 2mm or less in
height. Internal power switches with low on-resistance
increase efficiency and eliminate the need for external
Schottky diodes. The converter can run at 100% duty cycle
for low dropout operation that extends battery life in
portable systems.
Features
z Converter Input Voltage Range : 2.6V to 5.5V,
LDO Input Voltage Range : 2.4V to 5.5V
z Low-Noise LDO for RF Application
z Ultra-Fast Response in Line/Load Transient
z LDO Turn-On Time Less Than 40us
z Only 1μF LDO Output Capacitor Required for
Stability
z Current Limiting Protection
z 1.5A, High Efficiency Step-Down Converter
z 1.2MHZ Constant Switching Frequency
z Low RDS(ON) Internal Switches
z No Schottky Diode Required
z 0.8V Reference Allows Low Output Voltage
z Low Dropout Operation : 100% Duty Cycle
Internally Compensated
z < 2μA Shutdown Current
z Power Good Output Voltage Monitor
z Internal Soft-Start for PWM Converter
z Easy Power Sequence Control
z Over Temperature Protection
z Short Circuit Protection
z Thermally Enhanced 24-Lead WQFN Package
z RoHS Compliant and 100% Lead (Pb)-Free
Ordering Information
RT8023
Package Type
QW : WQFN-24L 4x4 (W-Type)
Note :
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
Applications
z Portable Instruments
z Microprocessors and DSP Core Supplies
z Cellular Phones
z Wireless and DSL Modems
z PC Cards
z Digital Cameras
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
DS8023-03 March 2011
www.richtek.com
1
1 page  
RT8023
Absolute Maximum Ratings (Note 1)
z Supply Input Voltage, VIN1, VIN2 ----------------------------------------------------------------------------- −0.3V to 6V
z Output Pin Voltage ------------------------------------------------------------------------------------------------ −0.3V to (VIN1 + 0.3V)
z PHASE Pin Voltage ---------------------------------------------------------------------------------------------- −0.3V to (VIN2 + 0.3V)
z Other I/O Pin Voltages ------------------------------------------------------------------------------------------- −0.3V to 6V
z Power Dissipation, PD @ TA = 25°C
WQFN-24L 4x4 ---------------------------------------------------------------------------------------------------- 1.923W
z Package Thermal Resistance (Note 2)
WQFN-24L 4x4, θJA ----------------------------------------------------------------------------------------------- 52°C/W
WQFN-24L 4x4, θJC ---------------------------------------------------------------------------------------------- 7°C/W
z Junction Temperature --------------------------------------------------------------------------------------------- 150°C
z Lead Temperature (Soldering, 10 sec.) ----------------------------------------------------------------------- 260°C
z Storage Temperature Range ------------------------------------------------------------------------------------ −65°C to 150°C
z ESD Susceptibility (Note 3)
HBM (Human Body Mode) -------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ---------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions (Note 4)
z Supply Input Voltage, Converter ------------------------------------------------------------------------------- 2.6V to 5.5V
z Supply Input Voltage, LDOs ------------------------------------------------------------------------------------ 2.4V to 5.5V
z Junction Temperature Range ------------------------------------------------------------------------------------ −40°C to 125°C
z Ambient Temperature Range ------------------------------------------------------------------------------------ −40°C to 85°C
Electrical Characteristics
(TA = 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Step-down converter
Input Voltage Range
Feedback Voltage
Under Voltage Lockout Threshold
DC Bias Current
Shutdown Current
Switch On Resistance, High
Switch On Resistance, Low
Peak Current Limit
Switching Frequency
VIN1
VFB1
VUVLO
ISHDN
RFET_H
RFET_L
ILIM
VDD1 Rising
VDD1 Hysteresis
Active, VFB = 0.75V,
Not Switching
EN2 = 0
IPHASE = 0.5A
IPHASE = 0.5A
Output Voltage Line Regulation
VIN1 = 2.6V to 5.5V
Min Typ Max Unit
2.6 -- 5.5 V
0.784 -- 0.816
2.24 2.36 2.48
V
V
-- 150 -- mV
-- 300 -- μA
-- -- 2 μA
-- 150 270 mΩ
-- 90 150 mΩ
1.7 2.3 3.2
A
1 1.2 1.4 MHz
-- 0.01 1 %/V
To be continued
DS8023-03 March 2011
www.richtek.com
5
5 Page 
RT8023
LDO1 Output Voltage vs. Temperature
2.53
2.52
2.51
2.50
2.49
2.48
2.47
-50
-25
VIN2 = 3.3V, VOUT2 = 2.5V
0 25 50 75
Temperature (°C)
100 125
LDO2 Output Voltage vs. Temperature
2.53
2.52
2.51
2.50
2.49
2.48
2.47
-50
-25
VIN3 = 3.3V, VOUT3 = 2.5V
0 25 50 75 100 125
Temperature (°C)
VOUT2
(20mV/Div)
LDO1 Load Transient Response
VIN2 = 5V, VOUT2 = 1.2V
IOUT2 = 0A to 0.7A
VOUT3
(20mV/Div)
LDO2 Load Transient Response
VIN3 = 5V, VOUT3 = 1.2V
IOUT3 = 0A to 0.35A
IOUT2
(0.5A/Div)
Time (50μs/Div)
LDO1 Line Transient Response
VIN2 = 2.5V to 3.5V, VOUT2 = 1.2V, IOUT2 = 100mA
IOUT3
(0.2A/Div)
Time (50μs/Div)
LDO2 Line Transient Response
VIN3 = 2.5V to 3.5V, VOUT3 = 1.2V, IOUT3 = 100mA
VIN2
(1V/Div)
VOUT2
(50mV/Div)
Time (50μs/Div)
DS8023-03 March 2011
VIN3
(1V/Div)
VOUT3
(50mV/Div)
Time (50μs/Div)
www.richtek.com
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet RT8023.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| RT8020 | Dual High-Efficiency PWM Step-Down DC-DC Converter | Richtek |
| RT8023 | 1.2MHz 1.5A Synchronous Step-Down Converter | Richtek |
| RT8024 | High Efficiency PWM Step-Down DC/DC Converter | Richtek |
| RT8025 | High Efficiency PWM Step-Down DC/DC Converter | Richtek |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |