LM2796TLEV National Semiconductor, LM2796TLEV Datasheet - Page 4

• Manufacturer Part Number: LM2796TLEV
• Description: BOARD EVALUATION LM2796TL
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM2796TLEV

• Current - Output / Channel: 20mA
• Outputs And Type: 7, Non-Isolated
• Voltage - Output: 4 V
• Features: Charge Pump
• Voltage - Input: 2.7 ~ 5.5V
• Utilized Ic / Part: LM2796
• Lead Free Status / RoHS Status: Not applicable / Not applicable

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f
t
1.5x/1x
Logic Pin Specifications: EN, ENA, ENB
V
V
I
SW
START
LEAK
Symbol
IL
IH
Electrical Characteristics
Limits in standard typeface and typical values apply for T
temperature range (-30˚C ≤ T
Group B LEDs not ON simultaneously (ENA = V
C
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under which operation of
the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the
Electrical Characteristics tables.
Note 2: All voltages are with respect to the potential at the GND pin.
Note 3: Internal thermal shutdown circuitry protects the device from permanent damage. Thermal shutdown engages at T
120˚C (typ.). The thermal shutdown function is guaranteed by design.
Note 4: The Human body model is a 100pF capacitor discharged through a 1.5k resistor into each pin. The machine model is a 200pF capacitor discharged directly
into each pin. MIL-STD-883 3015.7
Note 5: In applications where high power dissipation and/or poor package thermal resistance is present, the maximum ambient temperature may have to be
derated. Maximum ambient temperature (T
dissipation of the device in the application (P
following equation: T
Note 6: Junction-to-ambient thermal resistance is highly dependent on application and board layout. In applications where high maximum power dissipation exists,
special care must be paid to thermal dissipation issues in board design.
Note 7: Min and Max limits are guaranteed by design, test, or statistical analysis. Typical numbers are not guaranteed, but do represent the most likely norm.
Note 8: C
Note 9: If both LED groups are to be ON simultaneously, the maximum V
to the "MAXIMUM OUTPUT CURRENT, MAXIMUM LED VOLTAGE, MINIMUM INPUT VOLTAGE" section.
Note 10: For the two groups of outputs on a part (Group A and Group B), the following are determined: the maximum output current in the group (MAX), the
minimum output current in the group (MIN), and the average output current of the group (AVG). For each group, two matching numbers are calculated:
(MAX-AVG)/AVG and (AVG-MIN)/AVG. The largest number of the two (worst case) is considered the matching figure for the group. The matching figure for a given
part is considered to be the highest matching figure of the two groups. The typical specification provided is the most likely norm of the matching figure for all parts.
Note 11: Output resistance (R
V
equation applies when the charge pump is operating with a gain of 3/2 (V
Note 12: Headroom voltage: V
Note 13: There is a 300kΩ(typ.) pull-down resistor connected internally between each enable pin (EN, ENA, ENB) and GND.
Pout
2
, and C
= (1.5 x V
IN
Switching Frequency
Start-up Time
Charge pump gain cross-over:
Gain = 1.5 when V
threshold. Gain = 1 when V
above threshold.
Input Logic Low
Input Logic High
Input Leakage Current
POUT
, C
IN
OUT
) – (R
= 1µF. (Note 8)
, C
A-MAX
1
OUT
, and C
Parameter
= T
x I
OUT
J-MAX-OP
OUT
2
HR
: Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics
). In the equation, I
) models all voltage losses in the charge pump. R
= V
IN
J
Pout
is below
≤ +85˚C) . Unless otherwise specified: V
– (θ
– V
JA
A-MAX
D-MAX
Dxx
x P
IN
) is dependent on the maximum operating junction temperature (T
. If headroom voltage requirement is not met, LED current regulation will be compromised.
is
D-MAX
), and the junction-to ambient thermal resistance of the part/package in the application (θ
OUT
(Notes 2, 7) (Continued)
3.0V ≤ V
I
1.5x to 1x Threshold
1x to 1.5x Threshold
2.7V ≤ V
2.7V ≤ V
V
V
).
Dx
is the total output current: the sum of all active Dxx output currents and all current drawn from P
ENx
ENx
= 90% steady state
IN
= 0V
= 3V (Note 13)
and ENB = GND, or ENA = GND and ENB = V
IN
IN
IN
≤ 4.2V
≤ 5.5V
≤ 5.5V
Dxx
J
IN
= 25
voltage may need to be derated, depending on minimum input voltage conditions. Refer
≤ 4.75V typ.).
Condition
4
o
C. Limits in boldface type apply over the full operating junction
OUT
can be used to estimate the voltage at the charge pump output (P
IN
= 3.6V; V
Dxx
= 3.6V; V(EN) = 2.0V; Group A and
J-MAX-OP
Min
325
1.1
J
0
= 160˚C (typ.) and disengages at T
IN
); R
= 125˚C), the maximum power
SET
4.75
4.55
Typ
500
100
0.1
10
= 8.35kΩ; C
JA
), as given by the
Max
675
0.5
V
IN
OUT
IN
Units
, C
OUT
. The
kHz
µA
µs
V
V
V
V
J
1
=
):
,