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  Richtek Technology Electronic Components Datasheet  

RT9705A Datasheet

1A Power Multiplexer

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RT9705A pdf
Preliminary
RT9705A
80mΩ, 1A Power Multiplexer
General Description
The RT9705A is a dual input single output power multiplexer
specifically designed to provide seamless voltage transition
between two independent power suppliers. Equipped with
two low RDS(ON) N-Channel MOSFETs driven by internal
charge pump circuitry, the RT9705A is able to deliver 1A
output current with only 80mV voltage drop. Manual or
auto switching mode is easily selected by two digital inputs
D1 and D0. When both D0 and D1 are selected high, the
RT9705A enters shutdown mode and consumes minimum
power making it ideal suitable for battery powered
equipments. A STAT pin with open drain output is provided
to indicate the switch status. A user-programmable up to
1.25A current limit function is available for maximum safety
in various applications.
The RT9705A provides comprehensive protection functions,
including adjustable current limit, over temperature
protection, soft start function for minimum inrush current,
cross-conduction protection, and reverse conduction
protection. These features greatly simplify power
multiplexer design. The RT9705A is available in TSSOP-8
package requiring minimum board area and smallest
components.
Ordering Information
RT9705A
Package Type
C : TSSOP-8
Operating Temperature Range
P : Pb Free with Commercial Standard
Note :
RichTek Pb-free 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.
`100% matte tin (Sn) plating.
Features
z Adjustable Current Limiting up to 1.25A
z Built-In (Typically 80mΩ) N-Channel MOSFET
z Reverse Current Flow Blocking (no body diode) i.e.
Output Can Be Forced Higher than Input (Off-State)
z Low Supply Current :
`55μA Typical at Switch on State
`Less than 0.5μA Typical at Switch Off State
z Guaranteed 1A Continuous Load Current
z Wide Input Voltage Ranges : 2.8V to 5.5V
z Open-Drain STAT Output
z Hot Plug-In Application (Soft-Start)
z Thermal Shutdown Protection
z Smallest TSSOP-8 Package Minimizes Board Space
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z LCD Monitor, LCD-TV
z Information Appliance and Set-Top Box
z Battery-Powered Equipment
z ACPI Power Distribution
z Motherboard & Notebook PCs
z Mini PCI & PCI-Express Cards
z PCMCIA & New Cards
Pin Configurations
STAT
D0
D1
ILIM
(TOP VIEW)
8
27
36
45
TSSOP-8
VIN1
VOUT
VIN2
GND
DS9705A-01 March 2006
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT9705A Datasheet

1A Power Multiplexer

No Preview Available !

RT9705A pdf
RT9705A
Preliminary
Typical Application Circuit
Switch Status
VIN1
1 STAT
VIN1 8
D0
D1
RILIM
2 D0
VOUT 7
3
D1
RT9705A
VIN2
6
4 ILIM
GND 5
0.1uF
R1
VOUT
COUT RLOAD
0.1uF
VIN2
Functional Pin Description
Pin Name
Pin Function
VIN1
Power Input1 Voltage
VIN2
Power Input2 Voltage
VOUT
Output Voltage
GND
Ground
STAT
STAT is an open-drain output that is Hi-Z if the VIN2 switch is ON.
D0, D1
The truth table shown below illustrates the functionality of D0 and D1.
ILIM
A resistor RILIM from ILIM to GND sets the current limit ILIM to (500/RILIM).
Table 1. Truth Table
D1
D0 VIN2>VIN1 STAT
VOUT
0
0
X
Hi-Z
VIN2
0 1 No
0 VIN1
0
1
Yes
Hi-Z
VIN2
10 X
0 VIN1
11 X 0 0
Notes for Table 1.
1. X : Dont care
2. Hi-Z: High impedance node
3. D0 and D1 cannot be floating which will lead to an unknown state.
4. An internal MOSFET with 2kΩ RDS(ON) turns on and softly discharges the output voltage when D0 = D1 = 1.
www.richtek.com
2
DS9705A-01 March 2006


Part Number RT9705A
Description 1A Power Multiplexer
Maker RichTek
Total Page 11 Pages
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