LM34904 Datasheet, PDF (2/9 Pages) Texas Instruments – 500mA Current Limited Power Switch

LM34904
Connection Diagram
30194202
Top View
6-Bump Thin Micro SMD Package
See NS Package Number TMD06AAA
Ordering Information
Order Number
LM34904ITM/NOPB
LM34904ITMX/NOPB
Supplied As
250 Units on Tape and Reel
3000 Units on Tape and Reel
Pin Descriptions
Name
VCC
GND
POK
ACC_DET
ENABLE
ACC_PWR
Pin Number
A1
B1
C1
C2
B2
A2
Function
Power input of the PFET switch. It also provides power to the entire IC. Connect
to the voltage rail that the accessory device is expected to work off.
Common Ground (device substrate).
Open-drain PFET status indicator. When the PFET is off, this pin floats. When
PFET is on, it is grounded.
Pull this pin low to tell the IC that the downstream accessory device is plugged
in.
When this pin is low, the PFET will be turned off and POK will be open-drained.
Current limit circuitry will also be disabled. The IC will be in a low-power state.
This pin should be held low until VCC is established to ensure proper initial state
of internal logic. When ENABLE is high, the PFET switch will be allowed to turn
on.
Power output terminal of the PFET switch. Connect to input rail of accessory
device.
Truth Table
Input
ENABLE
ACC_DET ^{Current Limit}
Detected
T_J Limit
Exceeded
0
x
No
No
x
1
No
No
0 to 1
0
No
No
0 to 1
0
Yes
No
x
x
x
Yes
0
x
x
No
Note: "x" stands for "don't care".
2.8V < VCC < 5.3V
Yes
Yes
Yes
Yes
2.2V < VCC < 5.3V
2.2V < VCC < 2.8V
Output
PFET Switch
Status
POK
Open
Open Drain
Open
Open Drain
On
Grounded
Current Limited
Grounded
Open
Open Drain
Open
Open Drain
2
Copyright © 1999-2012, Texas Instruments Incorporated