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PDF RT9705B Data sheet ( Hoja de datos )
| Número de pieza | RT9705B | |
| Descripción | 1A Power Multiplexer | |
| Fabricantes | Richtek | |
| Logotipo |  |
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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 RDS(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
STAT
D0
D1
ILIM
(TOP VIEW)
8
27
36
45
VIN1
VOUT
VIN2
GND
TSSOP-8
DS9705B-03 April 2011
www.richtek.com
1
1 page  
RT9705B
Absolute Maximum Ratings (Note 1)
z Input Voltage, VIN1 & VIN2 ----------------------------------------------------------------------------------------- −0.3V to 6.0V
z Logic Inputs Voltage, D0 &D1 -------------------------------------------------------------------------------------- −0.3V to 6.0V
z Output Voltage, VOUT, STAT & ILIM ----------------------------------------------------------------------------- −0.3V to 6.0V
z Power Dissipation, PD @ TA = 25°C
TSSOP-8 ---------------------------------------------------------------------------------------------------------------- 0.43W
z Package Thermal Resistance (Note 2)
TSSOP-8, θJA ---------------------------------------------------------------------------------------------------------- 230°C/W
z Junction Temperature ------------------------------------------------------------------------------------------------- 125°C
z Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------- 260°C
z Storage Temperature Range ---------------------------------------------------------------------------------------- −65°C to 150°C
z ESD Susceptibility (Note 3)
HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 2kV
MM (Machine Mode) -------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions (Note 4)
z Input Voltage
VIN1 ( if VIN2 ≥ 2.8V) -------------------------------------------------------------------------------------------------- 2.3V to 5.5V
VIN1 ( if VIN2 < 2.8V) -------------------------------------------------------------------------------------------------- 2.8V to 5.5V
VIN2 ( if VIN1 ≥ 2.8V) -------------------------------------------------------------------------------------------------- 2.3V to 5.5V
VIN2 ( if VIN1 < 2.8V) -------------------------------------------------------------------------------------------------- 2.8V to 5.5V
z Logic Inputs Voltage (D0 &D1) ------------------------------------------------------------------------------------- 0V to 5.5V
z Junction Temperature Range ---------------------------------------------------------------------------------------- −40°C to 125°C
z Ambient Temperature Range ---------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VIN1 = VIN2 = 3.6V, CIN = COUT = 1μF, RILIM = 400Ω, TA = 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Power Switch
Switch On Resistance
Logic Inputs (D0 and D1)
RDS(ON)
VIN1 = VIN2 = 3.6V, IOUT = 1A
VIN1 = VIN2 = 3.6V, IOUT = 1A
−5°C ≤ TA ≤ 85°C (Note 5)
Logic Low to High Threshold Voltage VTH_LH
Threshold Hysteresis
Input Current at D0 or D1
VTH_H YS
IIL
IIH
D0 or D1 = High, Sink Current
D0 or D1 = Low, Source Current
Min
--
--
1.5
--
--
--
Typ Max Unit
80 95
mΩ
-- 120
-- 2.1 V
500 -- mV
-- 1
-- 1 μA
To be continued
DS9705B-03 April 2011
www.richtek.com
5
5 Page 
RT9705B
Layout Consideration
In order to meet the voltage drop, droop, and EMI requirements, careful PCB layout is necessary. The following guidelines
must be considered :
z Keep all main current traces as short and wide as possible.
z Place a ground plane under all circuitry to lower both resistance and inductance and improve DC and transient performance
(Use a separate ground and power plans if possible).
z Locate the ceramic input capacitors as close as possible to the VIN and GND pins of the device.
Figure 1. Top Layer
Figure 2. Bottom Layer
DS9705B-03 April 2011
www.richtek.com
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RT9705B.PDF ] | |
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