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PDF LM3495 Data sheet ( Hoja de datos )
| Número de pieza | LM3495 | |
| Descripción | Emulated Peak Current Mode Buck Controller | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM3495 (archivo pdf) en la parte inferior de esta página. Total 26 Páginas | ||
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April 2006
LM3495
Emulated Peak Current Mode Buck Controller for Low
Output Voltage
General Description
The LM3495 is a PWM buck regulator which implements a
unique emulated peak current mode control. This control
method eliminates the switching noise which typically limits
current mode operation at extremely short duty cycles and
high operating frequency. The switching frequency is pro-
grammable between 200 kHz and 1.5 MHz, and can also be
synchronized to an external clock. The LM3495 is also very
fault tolerant with both switch node short, hiccup mode, and
adaptive duty cycle limit protection. A 0.6V 1% reference and
glitch free pre-biased start-up ensure the most demanding
digital loads operate reliably. Internal soft start and the ability
to track the output of another supply make the LM3495
versatile and efficient.
Features
n Input voltage from 2.9V to 18V
n Output voltage adjustable from 0.6V to 5.5V
n Feedback Accuracy: ±1%
n Low-side Sensing, Programmable Current Limit without
sense resistor
n Input Under Voltage Lockout
n Hiccup mode current limit protection eliminates thermal
runaway during fault conditions
n Internal soft start with tracking capability
n 200 kHz to 1.5 MHz Switching frequency,
Synchronizable
n On-chip gate drivers
n Soft output discharge during shutdown
n Startup into output pre-bias
n Operation from a single input rail
n Adaptive Duty Cycle Limit
n TSSOP-16 package
Applications
n Wide input voltage buck converters with low voltage,
high accuracy outputs
n Core logic regulators
n High-efficiency buck regulation
Typical Application
© 2006 National Semiconductor Corporation DS201699
20169901
www.national.com
1 page  
Typical Performance Characteristics VIN = 12V unless specified, TA = 25˚C unless specified.
FB Reference Voltage vs Temperature
Switching Frequency vs Temperature
20169903
VLIN5 Voltage vs Temperature
20169904
Error Amplifier Transconductance vs Temperature
20169905
VLIN5 Voltage vs VIN
20169906
Efficiency in SKIP Mode
VO = 2.2V, IO = 10 mA to 500 mA
BOM in Table 2
20169908
5
20169912
www.national.com
5 Page 
Block Diagram
20169928
11 www.national.com
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet LM3495.PDF ] | |
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