LM2794TLX datasheet(4/16 Pages) NSC

4 / 16 page

Electrical Characteristics (Continued)

Limits in standard typeface are for T

J = 25˚C and limits in boldface type apply over the full Operating Junction Temperature

Range (−30˚C

≤ T

≤ +100˚C). Unless otherwise specified, C1 = C2 = C

IN =CHOLD = 1 µF, VIN = 3.6V, BRGT pin = 0V; RSET

=124

Ω ; LM2794:V

SD =VIN (LM2795: VSD = 0V).

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Switching Frequency (Note 6)

3.0V

≤ V

≤ 4.4V

325

515

675

kHz

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 TJ=150˚C (typ.) and disengages at

TJ=140˚C (typ.). D1, D2, D3 and D4 may be shorted to GND without damage. POUT may be shorted to GND for 1sec without damage.

Note 3: The value of

θJA is based on a two layer evaluation board with a dimension of 2in. x1.5in.

Note 4: In the test circuit, all capacitors are 1.0µF, 0.3

Ω 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, fOSC = 1/8fSW.

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