LM2794TLX National Semiconductor, LM2794TLX Datasheet - Page 4

• Manufacturer Part Number: LM2794TLX
• Description: IC LED DRVR WHT BCKLT 14USMD
• Manufacturer: National Semiconductor

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

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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