lm2773tlx National Semiconductor Corporation, lm2773tlx Datasheet - Page 4

• Manufacturer Part Number: lm2773tlx
• Description: Low-ripple 1.8v/1.6v Spread-spectrum Switched Capacitor Step-down Regulator
• Manufacturer: National Semiconductor Corporation

Note 4: Internal thermal shutdown circuitry protects the device from permanent damage. Thermal shutdown engages at T
=150°C (typ.) and disengages at
J
T
=140°C (typ.).
J
Note 5: The Human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin. MIL-STD-883 3015.7
Note 6: Maximum ambient temperature (T
) is dependent on the maximum operating junction temperature (T
= 110°C), the maximum power
A-MAX
J-MAX-OP
dissipation of the device in the application (P
), and the junction-to ambient thermal resistance of the part/package in the application (θ
), as given by the
D-MAX
JA
– (θ
following equation: T
= T
× P
).
A-MAX
J-MAX-OP
JA
D-MAX
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.
Note 8: 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 9: Open loop output resistance can be used to predict output voltage when, under low V
and high I
conditions, V
falls out of regulation. V
=
IN
OUT
OUT
OUT
(Gain)V
- (R
x I
)
IN
OL
OUT
Note 10: C
, C
, C
, C
: Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics.
IN
OUT
1
2
Note 11: V
is set to 1.9V during this test (Device is not switching).
OUT
Note 12: There are 350kΩ pull-down resistors connected internally between the EN pin and GND and the SEL pin and GND.
Note 13: Under the stated conditions, the maximum input current is equal to 2/3 the maximum output current.
Block Diagram
30047403
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