RT9705B Datasheet, PDF (1/12 Pages) Richtek Technology Corporation – The RT9705B is a dual input single output power

RT9705B
80mΩ, 1A Power Multiplexer
General Description
Features
The RT9705B is a dual input single output power
multiplexer specifically designed to provide seamless
voltage transition between two independent power
suppliers. Equipped with two low R_DS(ON) N-Channel
MOSFETs driven by internal charge pump circuitry, the
RT9705B 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 RT9705B 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.
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
The RT9705B 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 RT9705B is available in TSSOP-8
package requiring minimum board area and smallest
components.
Ordering Information
RT9705B
Package Type
C : TSSOP-8
Note :
Lead Plating System
P : Pb Free
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.
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
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Pin Configurations
(TOP VIEW)
STAT
D0
2
D1
3
ILIM
4
8
VIN1
7
VOUT
6
VIN2
5
GND
TSSOP-8
DS9705B-03 April 2011
www.richtek.com
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