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PDF RT6212B Data sheet ( Hoja de datos )
| Número de pieza | RT6212B | |
| Descripción | Step-Down Converter | |
| Fabricantes | Richtek | |
| Logotipo |  |
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RT6212A/B
2A, 18V, 500kHz, ACOTTM Step-Down Converter
General Description
The RT6212A/B is a high-efficiency, monolithic
synchronous step-down DC/DC converter that can
deliver up to 2A output current from a 4.5V to 18V input
supply. The RT6212A/B adopts ACOT architecture to
allow the transient response to be improved and keep
in constant frequency. Cycle-by-cycle current limit
provides protection against shorted outputs and
soft-start eliminates input current surge during start-up.
Fault conditions also include output under voltage
protection, output over current protection, and thermal
shutdown.
Ordering Information
RT6212A/B
Package Type
J6F : TSOT-23-6 (FC)
Lead Plating System
G : Green (Halogen Free and Pb Free)
UVP Option
H : Hiccup
PSM/PWM
A : PSM Mode
B : PWM Mode
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.
Features
Integrated 163m/86m MOSFETs
4.5V to 18V Supply Voltage Range
500kHz Switching Frequency
ACOT Control
0.8V 1.5% Voltage Reference
Internal Start-Up into Pre-biased Outputs
Compact Package : TSOT-23-6 Pin
Input Under-Voltage Lockout
Over-Current Protection and Hiccup
Applications
Set-Top Boxes
Portable TVs
Access Point Routers
DSL Modems
LCD TVs
Marking Information
RT6212AHGJ6F
0B=DNN
0B= : Product Code
DNN : Date Code
RT6212BHGJ6F
0A=DNN
0A= : Product Code
DNN : Date Code
Simplified Application Circuit
VIN
CIN
Enable
RT6212A/B
BOOT
VIN
LX
EN
FB
GND
CBOOT
L
R1
R2
CFF
VOUT
COUT
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS6212A/B-02 May 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT6212A/B
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Feedback Voltage
Feedback Voltage Threshold
Internal MOSFET
High-Side On-Resistance
Low-Side On-Resistance
Current Limit
VFB_TH
4.5V ≤ VIN ≤ 18V
RDS(ON)_H
RDS(ON)_L
VBOOT − VLX = 4.8V
0.788 0.8 0.812 V
-- 163 --
mΩ
-- 86 --
High-Side Switch Current Limit ILIM_H
Low-Side Switch Valley Current
Limit
ILIM_L
-- 5.8
2.6 3.3
--
--
A
Switching Frequency
Switching Frequency
On-Time Timer Control
fOSC
400 500 640 kHz
Minimum On Time
tON(MIN)
Minimum Off Time
tOFF(MIN)
Output Under Voltage and Over Voltage Protections
35 60 85
nS
185 240 315
OVP Trip Threshold
OVP Detect
-- 125 --
%
OVP Propagation Delay
-- 10 -- µS
UVP Trip Threshold
UVP Detect
Hysteresis
45 50 55
%
-- 10 --
UVP Propagation Delay
-- 5 -- µS
Thermal Shutdown
Thermal Shutdown Threshold TSD
Thermal Shutdown Hysteresis TSD
-- 150 --
°C
-- 20 --
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. The first
layer of copper area is filled 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.
DS6212A/B-02 May 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
VEN
(5V/Div)
VLX
(10V/Div)
VOUT
(1V/Div)
IOUT
(2A/Div)
Power On from Enable
VIN = 12V, VOUT = 1.2V, IOUT = 2A
Time (2.5ms/Div)
VEN
(5V/Div)
VLX
(10V/Div)
VOUT
(1V/Div)
IOUT
(2A/Div)
RT6212A/B
Power Off from Enable
VIN = 12V, VOUT = 1.2V, IOUT = 2A
Time (2.5ms/Div)
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS6212A/B-02 May 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet RT6212B.PDF ] | |
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