Interface Switch. RT9716B Datasheet

RT9716B Switch. Datasheet pdf. Equivalent

RT9716B Datasheet
Recommendation RT9716B Datasheet
Part RT9716B
Description Express Card Power Interface Switch
Feature RT9716B; RT9716A/B Express Card Power Interface Switch General Description The RT9716A/B power distribution.
Manufacture Richtek
Datasheet
Download RT9716B Datasheet




Richtek RT9716B
RT9716A/B
Express Card Power Interface Switch
General Description
The RT9716A/B power distribution switches are designed
to fulfill power management requirements of Express Card
specification. The RT9716A/B supports systems with
single slot ExpressCard|34 and ExpressCard|54 socket.
The device distributes 3.3V, AUX and 1.5V to the Express
Card socket. Each power rail is protected with current
limit circuitry when output load exceeds over-current
threshold or short-circuits occurs. A thermal protection
circuit turns off switches to prevent the device from damage
when power dissipation is increased by continuous heavy
overloads or short-circuits in the switches. The
RT9716A/B is available in WQFN-20L 4x4 package.
Features
z Meets Express Card Standard (ExpressCard|34 and
ExpressCard|54)
z Compliant with the Express Card Compliance
Check Lists, Compliance ID : EC100288
z Fully Satisfy the Express Card Implementation
Guidelines
z Supports Systems with WAKE Function
z TTL-Logic Compatible Input
z Under-Voltage Lockout Protection
z Over Current Protection
z Over Temperature Protection
z RoHS Compliant and Halogen Free
Ordering Information
RT9716A/B
Package Type
QW : WQFN-20L 4x4 (W-Type)
(Exposed Pad-Option 2)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
SYSRST Pull High Resistor
A : With Internal Resistor
B : Without Internal Resistor
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
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Applications
z PCs
z PDAs
z Digital Cameras
z TV and Set Top Boxes
Pin Configurations
(TOP VIEW)
STBY 1
3.3VIN 2
3.3VOUT 3
NC 4
NC 5
20 19 18 17 16
15 AUXOUT
GND
21
14 NC
13 NC
12 1.5VIN
11 1.5VOUT
6 7 8 9 10
WQFN-20L 4x4
DS9716A/B-01 April 2011
www.richtek.com
1



Richtek RT9716B
RT9716A/B
Typical Application Circuit
3.3V
FLG
3.3V
1.5V
SHDN
STBY
SYSRST
100k
RT9716A/B
AUXIN
AUXOUT
4.7uF
FLG
3.3VIN
4.7uF
1.5VIN
4.7uF
SHDN
STBY
SYSRST
3.3VOUT
1.5VOUT
PERST
CPPE
CPUSB
RCLKEN
GND
AUXOUT
22uF
3.3VOUT
22uF
1.5VOUT
22uF
PERST
CPPE
CPUSB
RCLKEN
Functional Pin Description
Pin No.
Pin Name
Pin Function
1
2
3
4, 5, 13, 14, 16
6
STBY
3.3VIN
3.3VOUT
NC
SYSRST
7, 21 (Exposed Pad) GND
8 PERST
Standby input-active low, logic level signal, Internal pulled up to AUXIN.
Input pin for 3.3V output voltage.
Switched output that delivers 0V,3.3V or high impedance to card.
No Internal Connection.
System reset input-active low, logic level signal, Internal pulled up to AUXIN for
RT9716A or floating for RT9716B.
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
A logic level power good to slot (with delay).
9 CPUSB Card present input for USB cards, Internal pulled up to AUXIN.
10
CPPE
Card present input for PCI cards, Internal pulled up to AUXIN.
11 1.5VOUT Switched output that delivers 0V,1.5V or high impedance to card.
12
1.5VIN
Input pin for 1.5V output voltage.
15 AUXOUT Switched output that delivers 0V,AUX or high impedance to card.
17
AUXIN
AUX input for AUXOUT and chip power.
Reference Clock Enable signal. As an output, a logic power good to host for slot
18 RCLKEN (no delay-open drain). As an input, if kept inactive(low) by the host, prevents
PERST from being de-asserted. Internal pulled up to AUXIN
19 FLG Over current or over temperature status output for slot (open drain)
20
SHDN
Shutdown input-active low, logic level signal. Internal pulled up to AUXIN
www.richtek.com
2
DS9716A/B-01 April 2011



Richtek RT9716B
Function Block Diagram
RT9716A/B
AUXIN
3.3VIN
1.5VIN
CPUSB
CPPE
STBY
SHDN
GND
UVLO
Current
Limit
Current
Limit
Current
Limit
Power
Good
AUXOUT
3.3VOUT
1.5VOUT
FLG
Gate
Control
Charge
Pump
Oscillator
OTP
AUXIN
Delay
RT9716A Only
AUXIN
RCLKEN
PERST
SYSRST
DS9716A/B-01 April 2011
www.richtek.com
3







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