LM34914SD/NOPB National Semiconductor, LM34914SD/NOPB Datasheet - Page 4

• Manufacturer Part Number: LM34914SD/NOPB
• Description: IC BUCK ADJ 1.25A 10LLP
• Manufacturer: National Semiconductor
• Type: Step-Down (Buck)r

Specifications of LM34914SD/NOPB

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 2.5 ~ 37 V
• Current - Output: 1.25A
• Frequency - Switching: 1.3MHz
• Voltage - Input: 8 ~ 40 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 10-LLP
• For Use With: LM34914EVAL - BOARD EVALUATION LM34914
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Other names: LM34914SDTR

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On Timer
Off Timer
Regulation and Over-Voltage Comparators (FB Pin)
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: V
Note 4: For detailed information on soldering plastic LLP packages, refer to the Packaging Data Book available from National Semiconductor Corporation.
Note 5: Typical specifications represent the most likely parametric norm at 25°C operation.
Note 6: Value shown assumes a 4-layer PC board and 4 vias to conduct heat from beneath the package.
Symbol
t
t
t
ON
ON
ON
V
t
T
θ
θ
OFF
REF
SD
JC
JA
- 1
- 2
- 3
CC
provides self bias for the internal gate drive and control circuits. Device thermal limitations limit external loading
On-time (normal operation)
On-time (normal operation)
On-time (current limit)
Shutdown threshold at RON/
SD
Shutdown Threshold
hysteresis
Minimum Off-time
FB regulation threshold
FB over-voltage threshold
FB bias current
Thermal shutdown temperature Junction temperature rising
Thermal shutdown hysteresis
Junction to Ambient
0 LFPM Air Flow (Note 6)
Junction to Case (Note 6)
Parameter
V
V
V
Voltage at RON/SD rising
Voltage at RON/SD falling
SS pin = steady state
IN
IN
IN
= 10V, R
= 40V, R
= 10V, R
Conditions
ON
ON
ON
= 200 kΩ
= 200 kΩ
= 200 kΩ
4
2.445
Min
2.1
0.4
1.13
2.50
Typ
655
265
175
2.8
0.8
2.9
32
15
20
30
8
2.550
Max
3.4
1.2
Units
°C/W
°C/W
mV
nA
°C
°C
µs
ns
µs
ns
V
V
V