LM2793LDEV National Semiconductor, LM2793LDEV Datasheet - Page 4

• Manufacturer Part Number: LM2793LDEV
• Description: BOARD EVALUATION LM2793LD
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM2793LDEV

• Current - Output / Channel: 16mA
• Outputs And Type: 2, Non-Isolated
• Voltage - Output: 4 V
• Features: Charge Pump
• Voltage - Input: 2.7 ~ 5.5V
• Utilized Ic / Part: LM2793
• Lead Free Status / RoHS Status: Not applicable / Not applicable

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Electrical Characteristics
Note 5: The human-body model is a 100 pF capacitor discharged through a 1.5 k resistor into each pin. The machine model is a 200pF capacitor discharged directly
into each pin.
Note 6: Maximum ambient temperature (T
dissipation of the device in the application (P
following equation: T
outside the listed T
Note 7: Junction-to-ambient thermal resistance is highly application and board-layout dependent. In applications where high maximum power dissipation exists,
special care must be paid to thermal dissipation issues. For more information on these topics, please refer to the Power Dissipation section of this datasheet.
Note 8: All room temperature limits are 100% tested or guaranteed through statistical analysis. All limits at temperature extremes are guaranteed by correlation
using standard Statistical Quality Control methods (SQC). All limits are used to calculate Average Outgoing Quality Level (AOQL). Typical numbers are not
guaranteed, but do represent the most likely norm.
Note 9: Maximum LED voltage (V
LED voltage for a given application can be approximated with the following equations:
The equations above assume LEDs are connected to outputs D
thorough analysis of maximum LED voltage, please refer to text sections of the datasheet (to appear in future datasheet revisions - in the interim, please contact
National Semiconductor for more information).
Note 10: Current sources are connected internally between P
voltage. For current sources to regulate properly, a minimum headroom voltage must be present across them. Minimum required headroom voltage is proportional
to the current flowing through the current source, as dictated by this equation: V
Block Diagram
A
A-MAX
rating, so long as the junction temperature of the device does not exceed the maximum operating rating of 100
= T
J-MAX-OP
V
IN-MIN
Dx
) is highly dependent on the application’s minimum input voltage and the amount of current flowing through the LEDs. Maximum
- (θ
<
JA
3.0V: V
A-MAX
D-MAX
x P
V
D-MAX
) is dependent on the maximum operating junction temperature (T
IN-MIN
), and the junction-to-ambient thermal resistance of the part/package in the application (θ
Dx-MAX
). The ambient temperature operating rating is provided merely for convenience. This part may be operated
(Notes 2, 8) (Continued)
≥ 3.0V: V
= (1.5 x V
OUT
1
and I
and D
Dx-MAX
Dx
2
. The voltage across each current source, [V(P
, and no current drawn from the charge pump output (P
IN-MIN
= 4.3V - (I
4
HR-min
) - (I
= 400mV x (I
DX
x 25 mV/mA) - (3.5Ω x 2 x I
DX
x 25 mV/mA)
Dx
/ 16mA).
J-MAX-OP
OUT
) - V(I
DX
= 100
)
Dx
OUT
)], is referred to as headroom
o
C.
). For a more precise and
o
C), the maximum power
20063601
JA
), as given by the