RT6576B Step-Down Controller Datasheet

RT6576B Datasheet, PDF, Equivalent


Part Number

RT6576B

Description

Dual-Channel Synchronous DC/DC Step-Down Controller

Manufacture

Richtek

Total Page 22 Pages
Datasheet
Download RT6576B Datasheet


RT6576B
®
RT6576A/B
Dual-Channel Synchronous DC/DC Step-Down Controller
with 5V/3.3V LDOs
General Description
The RT6576A/B is a dual-channel step-down controller
generating supply voltages for battery-powered systems.
It includes two Pulse-Width Modulation (PWM) controllers
adjustable from 2V to 5.5V, and two fixed 5V/3.3V linear
regulators. Each linear regulator provides up to 100mA
output current and 3.3V linear regulator provides 1%
accuracy under 35mA. The RT6576A/B has an oscillator
output to drive the external charge pump application. Other
features include on-board power-up sequencing, a power-
good output, internal soft-start, and soft-discharge output
that prevents negative voltage during shutdown.
A constant current ripple PWM control scheme operates
without sense resistors and provides 100ns response to
load transient. For maximizing power efficiency, the
RT6576A/B automatically switches to the diode-emulation
mode in light load applications. The RT6576A/B is available
in the WQFN-20L 3x3 package.
Features
Support Connected Standby Mode for Ultrabook
CCRCOT Control with 100ns Load Step Response
PWM Maximum Duty Ratio > 98%
5V to 25V Input Voltage Range
Dual Adjustable Output :
CH1 : 2V to 5.5V
CH2 : 2V to 4V
5V/3.3V LDOs with 100mA Output Current
1% Accuracy on 3.3V LDO Output
Oscillator Driving Output for Charge Pump
Application
Internal Frequency Setting
300kHz/355kHz (CH1/CH2)
Internal Soft-Start and Soft-Discharge
4700ppm/°C RDS(ON) Current Sensing
Independent Switcher Enable Control
Built-in OVP/UVP/OCP/OTP
Non-Latch UVLO
Power Good Indicator
RoHS Compliant and Halogen Free
Simplified Application Circuit
VIN
VOUT1
Channel 1 Enable
Channel 2 Enable
VIN UGATE2
RT6576A/B
BOOT2
UGATE1
BOOT1
PHASE2
LGATE2
PHASE1
LGATE1
FB2
CS1
BYP1
CS2
FB1
EN1
EN2
VCLK
LDO5
PGOOD
LDO3
GND
VOUT2
5V
PGOOD Indicator
3.3V
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
DS6576A/B-02 January 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT6576B
RT6576A/B
Applications
Notebook and Sub-Notebook Computers
System Power Supplies
2-Cell to 4-Cell Li+ Battery-Powered Devices
Marking Information
RT6576AGQW
6V= : Product Code
6V=YM
DNN
YMDNN : Date Code
Ordering Information
RT6576A/B
Pin 1 Orientation***
(2) : Quadrant 2, Follow EIA-481-D
Package Type
QW : WQFN-20L 3x3 (W-Type)
RT6576BGQW
6U=YM
DNN
6U= : Product Code
YMDNN : Date Code
Lead Plating System
G : Green (Halogen Free and Pb Free)
Pin Function With
A : LDO3 Always On
B : LDO3/LDO5 Always On
Pin Configurations
(TOP VIEW)
Note :
***Empty means Pin1 orientation is Quadrant 1
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.
CS1
FB1
LDO3
FB2
CS2
20 19 18 17 16
1 15 LGATE1
2 14 BYP1
3 GND 13 LDO5
4 21 12 VIN
5 11 LGATE2
6 7 8 9 10
WQFN-20L 3x3
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS6576A/B-02 January 2016


Features ® RT6576A/B Dual-Channel Synchronous D C/DC Step-Down Controller with 5V/3.3V LDOs General Description The RT6576A/B is a dual-channel step-down controller generating supply voltages for battery -powered systems. It includes two Pulse -Width Modulation (PWM) controllers adj ustable from 2V to 5.5V, and two fixed 5V/3.3V linear regulators. Each linear regulator provides up to 100mA output c urrent and 3.3V linear regulator provid es 1% accuracy under 35mA. The RT6576A/ B has an oscillator output to drive the external charge pump application. Othe r features include on-board power-up se quencing, a powergood output, internal soft-start, and soft-discharge output t hat prevents negative voltage during sh utdown. A constant current ripple PWM c ontrol scheme operates without sense re sistors and provides 100ns response to load transient. For maximizing power ef ficiency, the RT6576A/B automatically s witches to the diode-emulation mode in light load applications. The RT6576A/B is available in the WQFN-.
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