lm27953tlx National Semiconductor Corporation, lm27953tlx Datasheet - Page 2

• Manufacturer Part Number: lm27953tlx
• Description: White Led Driver With Four Led Current Sinks And 3/2x Switched Capacitor Boost
• Manufacturer: National Semiconductor Corporation

www.national.com
Connection Diagram
Pin Description
Operational States
Ordering Information
D6, E5, D4, E3
A1, B2, A5, E1
C5, B4, C3
Pin #s
C1
D2
A3
B6
A7
E7
C7
Order Information
LM27953TL
LM27953TLX
EN
H
L
D1, D2, D3, D4
C1+, C1-, C2+,
Pin Names
PWR GND
PWR P
SIG P
SIG GND
I
C2-
V
EN
NC
SET
IN
OUT
OUT
18-Bump Thin Micro SMD Package, Large Bump
Shutdown
Charge Pump Enabled. LEDs ON.
Input voltage. Input range: 2.7V to 5.5V.
Power Ground
Charge pump output. Approximately 1.5xV
Flying capacitor connections.
LED Outputs - Group A
Signal P
Enable for Charge Pump and LEDs (current outputs). Logic input.
High = LEDs ON. Low = LEDs OFF.
Pulsing this pin with a PWM signal (100Hz-1kHz) can be used to dim LEDs.
Signal Ground. Tie pin externally to PWR GND
Placing a resistor (R
Current = 100 x (1.25V ÷ R
No Connect
NS Package Number TLA18
Package
TLA18 Micro SMD
OUT
: Tie pins externally to PWR P
2
SET
Mode of Operation
) between this pin and GND sets the LED current. LED
SET
Pin Descriptions
).
OUT
IN
Supplied As
250 Units, Tape & Reel
3000 Units, Tape & Reel
20128002