lm2788mmx-1.8 National Semiconductor Corporation, lm2788mmx-1.8 Datasheet - Page 4

• Manufacturer Part Number: lm2788mmx-1.8
• Description: 120ma High Efficiency Step-down Switched Capacitor Voltage Converter
• Manufacturer: National Semiconductor Corporation

www.national.com
Electrical Characteristics
Limits in boldface type apply over the operating junction temperature range. Unless otherwise specified: 2.6 ≤ V
V(EN) = V
Note 4: Thermal shutdown circuitry protects the device from permanent damage.
Note 5: The Human body model is a 100 pF capacitor discharged through a 1.5 kΩ 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 a highly application and board-layout dependent. In applications where high maximum power dissipation exists,
special care must be paid to thermal dissipation issues. Fore 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: C
Note 10: Nominal output voltage (V
table for available options.
Note 11: Efficiency is measured versus V
results. Weighting to account for battery voltage discharge characteristics (V
Note 12: Turn-on time is measured from when the EN signal is pulled high until the output voltage crosses 90% of its final value.
Block Diagram
FLY
IN
, C
, C
IN
, and C
1
A
A-MAX
= C
rating, so long as the junction temperature of the device does not exceed the maximum operating rating of 125
2
OUT
= T
= 1µF, C
J-MAX-OP
: Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics
OUT
IN
- (θ
(nom) ) is the target output voltage of the part, as given by the output-voltage-option identifier. See Ordering Information
= C
IN
JA
A-MAX
, with V
D-MAX
x P
OUT
D-MAX
) is dependent on the maximum operating junction temperature (T
), and the junction-to ambient thermal resistance of the part/package in the application (θ
IN
= 10µF. (Note 9) (Continued)
). The ambient temperature operating rating is provided merely for convenience. This part may be operated
being swept in small increments from 3.0V to 4.2V. The average is calculated from these measurements
(Notes 2, 8) Limits in standard typeface and typical values apply for T
BAT
4
vs. Time) is not done in computing the average.
J-MAX-OP
= 125
o
C.
o
C), the maximum power
JA
20044403
IN
), as given by the
≤ 5.5V,
J
= 25
o
C.