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RT9705B PDF даташит

Спецификация RT9705B изготовлена ​​​​«Richtek» и имеет функцию, называемую «1A Power Multiplexer».

Детали детали

Номер произв RT9705B
Описание 1A Power Multiplexer
Производители Richtek
логотип Richtek логотип 

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RT9705B Даташит, Описание, Даташиты
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
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RT9705B Даташит, Описание, Даташиты
RT9705B
Typical Application Circuit
VIN1
Switch Status
1 STAT
VIN1 8
D0
D1
RILIM
2 D0
VOUT 7
3
D1
RT9705B
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
DS9705B-03 April 2011









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RT9705B Даташит, Описание, Даташиты
Test Circuits
5V
f = 28Hz
78% Duty Cycle
NC 1 STAT
VIN1 8
2 D0
VOUT 7
3
D1
RT9705B
VIN2
6
400 4 ILIM
GND 5
0.1uF
50
1uF
0.1uF
3.3V
Test Circuit 1
5V
f = 36Hz
78% Duty Cycle
NC 1 STAT
VIN1 8
2 D0
VOUT 7
3 D1
RT9705B
VIN2
6
400 4 ILIM
GND 5
0.1uF
50
1uF
0.1uF
3.3V
Test Circuit 2
5V
f = 580Hz
80% Duty Cycle
NC 1 STAT
VIN1 8
2 D0
VOUT 7
3
D1
RT9705B
VIN2
6
400 4 ILIM
GND 5
0.1uF
50
COUT
RT9705B
0.1uF
Test Circuit 3
5V
f = 220Hz
20% Duty Cycle
1k
400
1 STAT
VIN1 8
2 D0
VOUT 7
3
D1
RT9705B
VIN2
6
4 ILIM
GND 5
Test Circuit 4
0.1uF
VOUT
50
10uF
0.1uF
3.3V
DS9705B-03 April 2011
www.richtek.com
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