LM25574BLDT National Semiconductor, LM25574BLDT Datasheet - Page 5

• Manufacturer Part Number: LM25574BLDT
• Description: WEBENCH BUILD IT BOARD LM25574
• Manufacturer: National Semiconductor
• Series: WEBENCH®, PowerWise®, SIMPLE SWITCHER®r

Specifications of LM25574BLDT

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 1.23 ~ 40V
• Current - Output: 500mA
• Voltage - Input: 6 ~ 42V
• Regulator Topology: Buck
• Board Type: Partially Populated - Main IC Only
• Utilized Ic / Part: LM25574
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Frequency - Switching: -

RAMP GENERATOR
PWM COMPARATOR
ERROR AMPLIFIER
DIODE SENSE RESISTANCE
THERMAL SHUTDOWN
THERMAL RESISTANCE
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the
device is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: The human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin.
Note 3: Min and Max limits are 100% production tested at 25°C. Limits over the operating temperature range are guaranteed through correlation using Statistical
Quality Control (SQC) methods. Limits are used to calculate National’s Average Outgoing Quality Level (AOQL).
Typical Performance Characteristics
Symbol
D
SENSE
Tsd
θ
θ
JC
JA
Ramp Current 1
Ramp Current 2
Forced Off-time
Min On-time
COMP to PWM Comparator Offset
Feedback Voltage
FB Bias Current
DC Gain
COMP Sink / Source Current
Unity Gain Bandwidth
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
Junction to Case
Junction to Ambient
Oscillator Frequency vs R
Parameter
T
20214120
Vin = 36V, Vout=10V
Vin = 10V, Vout=10V
Vfb = COMP
5
Conditions
Oscillator Frequency vs Temperature
F
1.207
Min
272
416
OSC
36
3
= 200kHz
1.225
Typ
310
500
250
165
0.7
50
80
17
70
25
30
90
3
1.243
Max
368
575
64
20214121
www.national.com
Units
°C/W
°C/W
MHz
mΩ
mA
µA
µA
nA
dB
°C
°C
ns
ns
V
V