LM2700_04 NSC [National Semiconductor], LM2700_04 Datasheet - Page 5

• Manufacturer Part Number: LM2700_04
• Description: 600kHz/1.25MHz, 2.5A, Step-up PWM DC/DC Converter
• Manufacturer: NSC [National Semiconductor]

Electrical Characteristics
Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, T
and the ambient temperature, T
temperature is calculated using: P
regulator will go into thermal shutdown.
Note 4: The human body model is a 100 pF capacitor discharged through a 1.5kΩ resistor into each pin. The machine model is a 200pF capacitor discharged
directly into each pin.
Note 5: All limits guaranteed at room temperature (standard typeface) and at temperature extremes (bold typeface). All room temperature limits are 100% tested
or guaranteed through statistical analysis. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods.
All limits are used to calculate Average Outgoing Quality Level (AOQL).
Note 6: Typical numbers are at 25˚C and represent the most likely norm.
Note 7: Duty cycle affects current limit due to ramp generator.
Note 8: Current limit at 0% duty cycle. See TYPICAL PERFORMANCE section for Switch Current Limit vs. V
Note 9: Bias current flows into FB pin.
Note 10: Does not include the bond wires. Measured directly at the die.
Note 11: Refer to National’s packaging website for more detailed thermal information and mounting techniques for the LLP and TSSOP packages.
Typical Performance Characteristics
Efficiency vs. Load Current
Efficiency vs. Load Current
(V
(V
OUT
OUT
= 8V, f
= 5V, f
A
. See the Electrical Characteristics table for the thermal resistance. The maximum allowable power dissipation at any ambient
D
(MAX) = (T
S
S
= 600 kHz)
= 600 kHz)
J(MAX)
− T
(Continued)
A
20012334
)/θ
20012326
JA
. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the
5
Efficiency vs. Load Current
Efficiency vs. Load Current
(V
(V
J
(MAX), the junction-to-ambient thermal resistance, θ
OUT
OUT
IN
= 8V, f
= 12V, f
S
S
= 1.25 MHz)
= 600 kHz)
20012335
20012325
www.national.com
JA
,