Load Switch. RT9745A Datasheet

RT9745A Switch. Datasheet pdf. Equivalent

RT9745A Datasheet
Recommendation RT9745A Datasheet
Part RT9745A
Description Low Resistance Load Switch
Feature RT9745A; .
Manufacture Richtek
Datasheet
Download RT9745A Datasheet




Richtek RT9745A
®
RT9745A
Dual Channel, Low Resistance Load Switch
General Description
The RT9745A is a small, low RON, dual channel load switch
with EN controlled pin. The product contains two N-
MOSFETs that can operate between an input voltage range
of 0.8V to 5.5V. Also, it supports a maximum continuous
current of 6A each channel. Each switch is independently
controlled by EN pins (EN1 and EN2), which can directly
interface with low-voltage control signals.
The RT9745A is available in the WDFN-14TL 3x2 package
with exposed pad for high power and heat dissipation.
Ordering Information
RT9745A
Package Type
QW : WDFN-14TL 3x2 (W-Type)
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
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.
Marking Information
0P : Product Code
0PW
W : Date Code
Features
Integrated Dual Channel Load Switch
Input Voltage Range : 0.8V to 5.5V
Low RON Resistance
RON = 27mΩ at VIN = 5V (VDD = 5V)
RON = 27mΩ at VIN = 3.6V (VDD = 5V)
RON = 27mΩ at VIN = 1.8V (VDD = 5V)
6A Maximum Continuous Switch Current Per
Channel
Low Quiescent Current
75μA (Both Channels)
55μA (Single Channel)
Low Control Input Threshold Enables Use of 1.4V/
1.8V/2.5V/3.3V Logics
Configurable Rise Time
Quick Output Discharge (QOD)
Adaptive Discharge Current
14T-Lead WDFN Package with Thermal Pad
Applications
UltrabookTM
Notebooks/Netbooks
Tablet PC
Consumer Electronics
Set-Top Boxes/Residential Gateways
Telecom Systems
Solid State Drives (SSD)
Simplified Application Circuit
CIN1
Dual Power
Supply
or
Dual DC/DC
Converter
Enable
Enable
CIN2
VIN1
VOUT1
RT9745A
EN1
VDD
EN2
VIN2
SS1
SS2
VOUT2
GND
COUT1
VOUT1
RL1
CSS1
CSS2
COUT2
VOUT2
RL2
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS9745A-00 August 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1



Richtek RT9745A
RT9745A
Pin Configurations
(TOP VIEW)
VIN1
VIN1
EN1
VDD
EN2
VIN2
VIN2
1
2
3
4
5
6
7
GND
15
14 VOUT1
13 VOUT1
12 SS1
11 GND
10 SS2
9 VOUT2
8 VOUT2
WDFN-14TL 3x2
Functional Pin Description
Pin No.
1, 2
3
4
5
Pin Name
VIN1
EN1
VDD
EN2
Pin Function
Input Voltage for Switch 1. Bypass this input with a ceramic capacitor to
GND. Recommended voltage range for this pin for optimal RON performance
is 0.8V to VDD.
Enable Control Input for Switch 1 (Active High). Do not leave floating.
Charge Pump Voltage Input. Power supply to the device. Recommended
voltage range for this pin is 2.5V to 5.5V.
Enable Control Input for Switch 2 (Active High). Do not leave floating.
Input Voltage for Switch 2. Bypass this input with a ceramic capacitor to
6, 7 VIN2 GND. Recommended voltage range for this pin for optimal RON performance
is 0.8V to VDD.
8, 9
VOUT2
Switch 2 Output.
10
11,
15 (Exposed Pad)
SS2
GND
Switch 2 Slew Rate Control. Can be left floating.
Ground. The Exposed pad should be soldered to a large PCB and connected
to GND for maximum thermal dissipation.
12
13, 14
SS1
VOUT1
Switch 1 Slew Rate Control. Can be left floating.
Switch 1 Output.
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS9745A-00 August 2014



Richtek RT9745A
Function Block Diagram
VIN1
SS1
EN1
Control Logic
RT9745A
VOUT1
VDD
Charge Pump
GND
EN2
SS2
VIN2
Control Logic
VOUT2
Operation
The RT9745A contains two N-MOSFETs which controlled
by EN pin independently.
Enable Control
Asserting ENx pin high enables the switch. Switch will
turn on as the EN signal is higher than VENH, and turn off
when the EN signal is lower than VENL. Thus, it can operate
under low voltage logic, please refer to the electrical
characteristics. This pin cannot be left floating and must
be tied either high or low voltage for proper functionality.
Charge Pump
Provides sufficient bias voltage to both N-MOSFETs.
Adjustable Rise Time
Connecting a capacitor to GND on the SSx pin sets the
slew rate for each channel. It could also be used to prevent
in-rush current.
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS9745A-00 August 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3







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