Step-Down Converter. RT6212B Datasheet

RT6212B Converter. Datasheet pdf. Equivalent

RT6212B Datasheet
Recommendation RT6212B Datasheet
Part RT6212B
Description Step-Down Converter
Feature RT6212B; RT6212A/B 2A, 18V, 500kHz, ACOTTM Step-Down Converter General Description The RT6212A/B is a high-.
Manufacture Richtek
Datasheet
Download RT6212B Datasheet




Richtek RT6212B
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/86mMOSFETs
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



Richtek RT6212B
RT6212A/B
Pin Configurations
(TOP VIEW)
BOOT EN FB
654
23
GND LX VIN
TSOT-23-6 (FC)
Functional Pin Description
Pin No.
Pin Name
Pin Function
1 GND
2 LX
3 VIN
4 FB
5 EN
6 BOOT
System Ground. Provides the ground return path for the control circuitry and
low-side power MOSFET.
Switch Node. LX is the switching node that supplies power to the output and
connect the output LC filter from LX to the output load.
Power Input. Supplies the power switches of the device.
Feedback Voltage Input. This pin is used to set the desired output voltage via
an external resistive divider. The feedback voltage is 0.8V typically.
Enable Control Input. Floating this pin or connecting this pin to GND can
disable the device and connecting this pin to logic high can enable the device.
Bootstrap Supply for High-Side Gate Driver. Connect a 100nF or greater
capacitor from LX to BOOT to power the high-side switch.
Function Block Diagram
BOOT VIN
VIN
Reg
PVCC
VIBIAS
VREF
OC
PVCC
UV &OV
Ripple
LX Gen. +
Minoff
Control
Comparator
PVCC
Driver
GND LX
EN
UGATE
LGATE
VIN
On-Time LX
LX
GND
EN
FB
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS6212A/B-02 May 2016



Richtek RT6212B
Operation
The RT6212A/B is a synchronous step-down converter
with advanced constant on-time control mode. Using
the ACOTTM control mode can reduce the output
capacitance and provide fast transient response. It can
minimize the component size without additional
external compensation network.
Current Protection
The inductor current is monitored via the internal
switches cycle-by-cycle. Once the output voltage drops
under UV threshold, the RT6212A/B will enter hiccup
mode.
RT6212A/B
UVLO Protection
To protect the chip from operating at insufficient supply
voltage, the UVLO is needed. When the input voltage
of VIN is lower than the UVLO falling threshold voltage,
the device will be lockout.
Thermal Shutdown
When the junction temperature exceeds the OTP
threshold value, the IC will shut down the switching
operation. Once the junction temperature cools down
and is lower than the OTP lower threshold, the
converter will autocratically resume switching.
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS6212A/B-02 May 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3







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