Step-Down Converter. RTQ2822B Datasheet


RTQ2822B Converter. Datasheet pdf. Equivalent


Part Number

RTQ2822B

Description

High Efficiency Synchronous Step-Down Converter

Manufacture

Richtek

Total Page 30 Pages
Datasheet
Download RTQ2822B Datasheet


RTQ2822B
® RTQ2822A/B
12A, 17V, High Efficiency Synchronous Step-Down Converter
General Description
The RTQ2822A/B is a high-performance, synchronous
step-down converter that can deliver up to 12A output
current with an input supply voltage range of 4.5V to 17V.
The device integrates low RDS(ON) power MOSFETs,
accurate 0.6V reference and an integrated diode for
bootstrap circuit to offer a very compact solution.
The RTQ2822A/B adopts Advanced Constant On-Time
(ACOTTM) control architecture that provides ultrafast
transient response and further reduce the external-
component count. In steady states, the ACOTTM operates
in nearly constant switching frequency over line, load and
output voltage ranges and makes the EMI filter design
easier.
The device offers a variety of functions for more design
flexibility. The selectable switching frequency, current limit
level and PWM operation modes makes the
RTQ2822A/B easy-to-use over wide application range.
Independent enable control input pin and power good
indicator are also provided for easy sequence control. To
control the inrush current during the startup, the device
provides a programmable soft start-up by an external
capacitor connected to the SS pin. Fully protection
features are also integrated in the device including the
cycle-by-cycle current limit, OVP, UVP, input UVLO and
OTP.
The RTQ2822A/B is available in a thermally enhanced
VQFN-18L 3.5x3.5 (FC) package.
Features
4.5V to 17V Input Voltage Range
Integrated 9.8mΩ/4.5mΩ MOSFETs
0.6V ±1% Voltage Reference
Adjustable Output Voltage from 0.6V to 5.5V
Supports Ceramic Output Capacitor
ACOTTM Control for Fast Transient Response
Selectable Switching Frequency (400kHz/800kHz/
1200kHz)
Selectable Current Limit Level
Power Good Indicator
Programmable Soft-Start Time with a Default 1ms
Monotonic Start-Up into Pre-Biased Outputs
18-Lead VQFN (FC) Package
Applications
Server, Storage and Network Equipment
Telecom Infrastructure
Point of Load (POL) Power Modules
High Density DC-DC Converters
High End Digital TV
Pin Configuration
(TOP VIEW)
18 17 16 15 14 13
BOOT 1
VIN 2
PGND 3
PGND 4
PGND 5
67
12 AGND
11 VIN
10 PGND
9 PGND
8 PGND
VQFN-18L 3.5x3.5 (FC)
Copyright ©2019 Richtek Technology Corporation. All rights reserved.
DSQ2822A/B-01 June 2019
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RTQ2822B
RTQ2822A/B
Ordering Information
Marking Information
RTQ2822A/B
RTQ2822AGQVF
Package Type
QVF : VQFN-18L 3.5x3.5 (FC) (V-Type)
Lead Plating System
17=YM
DNN
G : Green (Halogen Free and Pb Free)
17= : Product Code
YMDNN : Date Code
Enable Pin
A : Internal Pull High
B : Internal Pull Low
Note :
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.
RTQ2822BGQVF
16=YM
DNN
16= : Product Code
YMDNN : Date Code
Functional Pin Description
Pin No.
Pin Name
Pin Function
1
BOOT
Bootstrap, supply for high-side gate driver. Connect a 0.1F ceramic capacitor
between BOOT and SW pins.
2, 11
VIN
Input voltage. Support 4.5V to 17V input voltage. Suggest to place equal-value
input capacitors on each side of the IC and as close to the VIN and PGND pins as
possible.
3, 4, 5, 8, 9, 10 PGND
System GND. The power GND of the controller circuit and the regulated output
voltage. Use wide PCB traces to make the connections. AGND and PGND are
connected with a short trace and at only one point to reduce circulating currents.
6, 7 SW
Switch node. Connect to the power inductor.
12
AGND
Analog GND. AGND and PGND are connected with a short trace and at only one
point to reduce circulating currents.
13 FB
Feedback input. The pin is used to set the output voltage of the converter via a
resistor divider. Suggest to place the FB resistor divider as close to FB pin and
AGND as possible.
14 SS
Soft-start time control pin. Connect a capacitor between the SS pin and AGND to
set the soft-start time. The default internal start-up time is 1ms without external
capacitor.
15 EN
IC enable.
RTQ2822A : Internal pull high.
RTQ2822B : Internal pull low.
Open-drain, power-good indication output. It is pulled low if the feed-back voltage
16
PGOOD
is out of PGOOD threshold, IC shutdown from OTP and EN goes low, and before
the soft start is finished. A pull-up resistor of 10kto 100kis recommended if this
function is used.
17 VCC
4.7V internal LDO output. Connect a 4.7F capacitor as close to the VCC pin as
possible. It does not recommend to connect VCC to supply others rails.
Switching frequency, current limit selection and light load operation mode selection
18
MODE
pin. Connect this pin to a resistor divider from VCC and AGND for different MODE
options.
Copyright ©2019 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DSQ2822A/B-01 June 2019


Features ® RTQ2822A/B 12A, 17V, High Efficiency Synchronous Step-Down Converter Gener al Description The RTQ2822A/B is a high -performance, synchronous step-down con verter that can deliver up to 12A outpu t current with an input supply voltage range of 4.5V to 17V. The device integr ates low RDS(ON) power MOSFETs, accurat e 0.6V reference and an integrated diod e for bootstrap circuit to offer a very compact solution. The RTQ2822A/B adopt s Advanced Constant On-Time (ACOTTM) co ntrol architecture that provides ultraf ast transient response and further redu ce the externalcomponent count. In stea dy states, the ACOTTM operates in nearl y constant switching frequency over lin e, load and output voltage ranges and m akes the EMI filter design easier. The device offers a variety of functions fo r more design flexibility. The selectab le switching frequency, current limit l evel and PWM operation modes makes the RTQ2822A/B easy-to-use over wide applic ation range. Independent enable control input pin and power good.
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