®
RT6219
4A, 23V, 500kHz, ACOT® Synchronous Buck Converter
General Description
Features
The RT6219 is a synchronous Buck converter with
Advanced Constant On-Time (ACOT®) mode control which
5V to 23V Input Voltage Range
provides a very fast transient response with no external
compensators. The RT6219 operates from 5V to 23V input
voltage, provides complete protection functions including
Over Current Protection(OCP), Under Voltage Protection
(UVP) and Over Voltage Protection (OVP). This IC also
provides a 1.5ms internal soft-start function and an opendrain power good indicator.
Adjustable from 0.6V to 5V Output Range
Up to 98% Duty for 2S Battery Application
500kHz Switching Frequency
ACOT® Mode Performs Fast Transient Response
Integrated MOSFETs
67mΩ
Ω of High-Side MOSFET
41mΩ
Ω of Low-Side MOSFET
Supports MLCC Output Capacitors
Internal Soft-Start (1.5ms typ)
Built-in OVP/UVP/OCP
Power Good Indicator
Thermal Shutdown
Ordering Information
RT6219
Package Type
QW : WDFN-10L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
PWM Operation / VOUT Protection
A : with DEM/Latch
AH : with DEM/Hiccup
BL : without DEM/Latch
BH : without DEM/Hiccup
Applications
Note :
Richtek products are :
Laptop Computers
Tablet PCs
Networking Systems
Servers
Personal Video Recorders
Flat Panel Television and Monitors
Distributed Power Systems
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
BOOT
VIN
VIN
CIN
Enable
L
EN
RBYP
SW
PGND
FB
PGOOD
VCC
Copyright © 2020 Richtek Technology Corporation. All rights reserved.
September 2020
VOUT
R1
VBYP
CBYP
DS6219-08
CB
RT6219
CEN
VSYS
RB
RPGOOD
VCC
COUT
R2
CVCC
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
RT6219
Marking Information
RT6219AGQW
RT6219AHGQW
7S= : Product Code
6K= : Product Code
6K=YM
DNN
YMDNN : Date Code
7S=YM
DNN
RT6219BLGQW
RT6219BHGQW
7Q= : Product Code
7Q=YM
DNN
YMDNN : Date Code
7R= : Product Code
YMDNN : Date Code
7R=YM
DNN
YMDNN : Date Code
Pin Configuration
PGOOD
VBYP
VIN
EN
FB
1
2
3
4
5
PGND
(TOP VIEW)
11
10
9
8
7
6
SW
SW
SW
BOOT
VCC
WDFN-10L 3x3
Functional Pin Description
Pin No.
Pin Name
Pin Function
1
PGOOD
This pin should be connected to a pull high voltage with a 100k resistor.
Recommend to pull high by VCC (5V). DO NOT pull high to external voltage
which is higher than VCC (5V).
2
VBYP
Switch over input supply voltage for VCC. A low pass filter should be connected
to AGND, if VBYP is applied. If VBYP is not used, then connect to AGND. Do not
connect to VCC pin.
3
VIN
Power input connect to high-side MOSFET drain.
4
EN
Enable control input. Do not leave this pin floating. The slew rate of EN is
recommended to be slower than 4.8V/s.
5
FB
Feedback voltage input.
6
VCC
5V linear regulator output for internal control circuit. Bypass VCC to AGND with a
2.2F capacitor. VCC can only supply internal circuits. Do not connect to external
loads.
7
BOOT
Bootstrap supply for high-side gate driver. A capacitor is needed to drive the
power switch's gate above the supply voltage. It is connected between the SW
and BOOT pins to form a floating supply across the power switch driver.
SW
Switch node.
PGND
Power ground. The exposed pad must be soldered to a large PCB and connected
to GND for maximum power dissipation.
8, 9, 10
11
(Exposed Pad)
Copyright © 2020 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS6219-08
September 2020
RT6219
Functional Block Diagram
VBYP
VCC
VCC
POR &
Reference
Soft-Start
FB
VREF
VFB
VCC
Switch-Over
+
+
-
VIN
On-Time
One shot
Gate
Control
Logic
Min off Time
BOOT
SW
VCC
EN
PGND
SW
VOC
125% x VREF
-
+
-
OVP
PGND
Fault
Logic
+
91.5% x VREF
PGOOD
OCP
+
POK
58% x VREF
+
UVP
VCC
VIN
VCC
Regulator
-
Operation
Overall
OCP
The RT6219 is a synchronous step-down converter with
advanced constant on-time control mode. Using the ACOT®
The inductor valley current is monitored cycle-by-cycle
via the internal switches, preventing an on-time until the
current drops below the current limit.
control mode can reduce the output capacitance and
provide fast transient response. It can minimize the
component size without additional external compensation
network.
Power Good
After soft-start is finished, the power good output goes
high. The PGOOD pin is an open-drain output.
Internal VCC Regulator
The regulator provides 5V power to supply the internal
control circuit. Connecting a 2.2μF ceramic capacitor for
decoupling and stability is required.
VCC Switch-Over
Soft-Start
Power Off
In order to prevent the converter output voltage from
overshooting during the startup period, the soft-start
function is necessary. The soft-start time is internal setting
and the duration is around 1.5ms.
There is an internal discharging circuit to discharge the
residual charge of output capacitor when converter is power
off.
Copyright © 2020 Richtek Technology Corporation. All rights reserved.
DS6219-08
September 2020
The internal regulator output will switch over to VBYP if
VBYP level is higher than 4.6V.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3
RT6219
Absolute Maximum Ratings
(Note 1)
VIN to PGND -------------------------------------------------------------------------------------------------- −0.3V to 27V
SW to PGND -------------------------------------------------------------------------------------------------- −0.3V to (VIN + 0.3V)
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