LM2794TLX National Semiconductor, LM2794TLX Datasheet - Page 4
LM2794TLX
Manufacturer Part Number
LM2794TLX
Description
IC LED DRVR WHT BCKLT 14USMD
Manufacturer
National Semiconductor
Datasheet
1.LM2794TLX.pdf
(16 pages)
Specifications of LM2794TLX
Constant Current
Yes
Topology
PWM, Switched Capacitor (Charge Pump), Step-Up (Boost)
Number Of Outputs
4
Internal Driver
Yes
Type - Primary
Backlight
Type - Secondary
White LED
Frequency
325kHz ~ 675kHz
Voltage - Supply
2.7 V ~ 5.5 V
Voltage - Output
3.8V
Mounting Type
Surface Mount
Package / Case
14-UFBGA
Operating Temperature
-30°C ~ 85°C
Current - Output / Channel
20mA
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
*LM2794TLX
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LM2794TLX
Manufacturer:
NS/国半
Quantity:
20 000
Company:
Part Number:
LM2794TLX/NOPB
Manufacturer:
Texas Instruments
Quantity:
10 000
www.national.com
f
SW
Electrical Characteristics
Limits in standard typeface are for T
Range (−30˚C ≤ T
=124Ω ; LM2794:V
Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device
beyond its rated operating conditions.
Note 2: Internal thermal shutdown circuitry protects the device from permanent damage. Thermal shutdown engages at T
T
Note 3: The value of θ
Note 4: In the test circuit, all capacitors are 1.0µF, 0.3Ω maximum ESR capacitors. Capacitors with higher ESR will increase output resistance, reduce output
voltage and efficiency.
Note 5: Voltage at which the device switches from charge-pump mode to pass mode or pass mode to charge-pump mode. For example, during pass mode the
device output (Pout) follows the input voltage.
Note 6: The output switches operate at one eigth of the oscillator frequency, f
Symbol
J
=140˚C (typ.). D1, D2, D3 and D4 may be shorted to GND without damage. P
Switching Frequency (Note 6)
JA
J
SD
≤ +100˚C). Unless otherwise specified, C1 = C2 = C
is based on a two layer evaluation board with a dimension of 2in. x1.5in.
= V
Parameter
IN
(LM2795: V
J
= 25˚C and limits in boldface type apply over the full Operating Junction Temperature
SD
= 0V).
(Continued)
3.0V ≤ V
IN
Conditions
≤ 4.4V
OSC
4
OUT
= 1/8f
may be shorted to GND for 1sec without damage.
SW
.
IN
= C
HOLD
= 1 µF, V
Min
325
IN
= 3.6V, BRGT pin = 0V; R
Typ
515
J
=150˚C (typ.) and disengages at
Max
675
Units
kHz
SET