Step-Down Converter. RT2658 Datasheet


RT2658 Converter. Datasheet pdf. Equivalent


Part Number

RT2658

Description

Synchronous Step-Down Converter

Manufacture

Richtek

Total Page 18 Pages
Datasheet
Download RT2658 Datasheet


RT2658
®
RT2658
6A, 6V, Synchronous Step-Down Converter with REFIN
General Description
The RT2658 in thermally enhanced VQFN-20L 3.5x4
package is a full featured 6V, 6A synchronous step-down
DC-DC converter designed specifically for Double Data
Rate (DDR) memory termination, which provides a
continuous 6A sink and source current and fixed 1/2 DDQ
at output. The current mode COT architecture with
external compensation allows the transient response to
be optimized over a wide range of loads and achieves
nearly constant switching frequency over line, load, and
output voltage ranges. The multiple sets of over-current
limit and switching frequency offer an optimized power
chain for application design.
Efficiency is maximized through the integrated 20mΩ/
10mΩ MOSFETs, and cycle-by-cycle current limit provides
protection against shorted outputs. Output external
tracking function, output soft discharge, power good
indicating, output droop support are all featured in the
RT2658. In addition, the device is specified from 0°C to
85°C to perform an excellent regulation with an accurate
1% reference voltage over temperature.
Features
Continuous 6A Sink or Source Output Current ability
and Droop Design for DDR Memory Termination
Applications
Low RDS(ON) Power N-MOSFET Switches 20mΩ/
10mΩ
Input Voltage Range : 1V to 6V
Output Adjustable from 0.6V to 2V
Current-Mode Constant On-Time Control Design
Enables Fast Transient Response
Supports All MLCC Output Capacitor and SP/
POSCAP with Robust Loop Stabilization
Selectable 600kHz or 1MHz Switching Frequency
Supports Pre-Biased Start-Up
Selectable Over-Current Protection
Various Operation Mode Selection for Different
Application Requirements
External Tracking Start-Up Application
Enable Input Control and Power Good Indicator
Under-Voltage and Over-Voltage Protection
Applications
DDR-2/3/4 VTT Regulation (1/2VDDQ) for Enterprise
Servers, Ethernet Switches and Routers, Global Storage,
GSM Base Station, and Industrial equipments
Enterprise POL (using precision internal VREF)
Simplified Application Circuit
VIN
Enable
VIN BOOT
CIN RT2658
EN SW
Mode
RCOMP CCOMP
MODE
COMP
CREF
R2
VREF
R1
REFIN
VOUT
V5IN
PGOOD
PGND
GND
Copyright ©2018 Richtek Technology Corporation. All rights reserved.
DS2658-01 February 2018
CBOOT
L
COUT
VOUT
CV5IN
RPGOOD
VV5IN
PGOOD
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT2658
RT2658
Ordering Information
RT2658
Package Type
QV : VQFN-20L 3.5x4 (V-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
L : Latched OVP and UVP
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.
Pin Configuration
(TOP VIEW)
20 19 18 17 16
PGND 1
PGND 2
PGND 3
VIN 4
VIN 5
PGND
21
15 SW
14 SW
13 SW
12 SW
11 SW
6 7 8 9 10
Marking Information
02= : Product Code
02=YM
DNN
YMDNN : Date Code
VQFN-20L 3.5x4
Functional Pin Description
Pin No.
1, 2, 3,
21 (Exposed Pad)
Pin Name
PGND
Pin Function
Power ground. Provide the ground return path for the low-side power MOSFET
and positive input of an internal amplifier for current sensing circuit. The
exposed pad must be soldered to a large PCB and connected to PGND for
minimum power dissipation.
4, 5 VIN Power input. Supplies the power switches of the device.
6
7
8
9
10
11 to 15
16
GND
VREF
COMP
REFIN
VOUT
SW
BOOT
Signal ground. Provides the return path for control circuitry and internal
reference.
Reference output. A specified 2V reference output is supplied by internal linear
regulator. Decouple with a 0.22F capacitor between this pin and GND.
Compensation node. The current comparator threshold increases with this
control voltage. Connect external compensation elements between this pin and
VREF pin to stabilize the control loop.
Reference input. The output voltage is targeted by reference input, which is
applied from 0.6V to 2V.
Output voltage monitor node. A negative input of the gm error amplifier and it is
allowed to be a discharge path if any protection is triggered.
Switch node. SW is the switching node that supplies power to the output and
connect the output LC filter from SW to the output load.
Bootstrap supply for high-side gate driver. Connect a 100nF or greater
capacitor from SW to BOOT to power the high-side switch.
Copyright ©2018 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS2658-01 February 2018


Features ® RT2658 6A, 6V, Synchronous Step-Down Converter with REFIN General Descript ion The RT2658 in thermally enhanced VQ FN-20L 3.5x4 package is a full featured 6V, 6A synchronous step-down DC-DC con verter designed specifically for Double Data Rate (DDR) memory termination, wh ich provides a continuous 6A sink and s ource current and fixed 1/2 DDQ at outp ut. The current mode COT architecture w ith external compensation allows the tr ansient response to be optimized over a wide range of loads and achieves nearl y constant switching frequency over lin e, load, and output voltage ranges. The multiple sets of over-current limit an d switching frequency offer an optimize d power chain for application design. E fficiency is maximized through the inte grated 20mΩ/ 10mΩ MOSFETs, and cycle- by-cycle current limit provides protect ion against shorted outputs. Output ext ernal tracking function, output soft di scharge, power good indicating, output droop support are all featured in the RT2658. In addition, the dev.
Keywords RT2658, datasheet, pdf, Richtek, Synchronous, Step-Down, Converter, T2658, 2658, 658, RT265, RT26, RT2, Equivalent, stock, pinout, distributor, price, schematic, inventory, databook, Electronic, Components, Parameters, parts, cross reference, chip, Semiconductor, circuit, Electric, manual, substitute




@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)