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PDF LM2705 Data sheet ( Hoja de datos )
| Número de pieza | LM2705 | |
| Descripción | Micropower Step-up DC/DC Converter with 150mA Peak Current Limit | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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April 2003
LM2705
Micropower Step-up DC/DC Converter with 150mA Peak
Current Limit
General Description
The LM2705 is a micropower step-up DC/DC in a small
5-lead SOT-23 package. A current limited, fixed off-time
control scheme conserves operating current resulting in high
efficiency over a wide range of load conditions. The 21V
switch allows for output voltages as high as 20V. The low
400ns off-time permits the use of tiny, low profile inductors
and capacitors to minimize footprint and cost in space-
conscious portable applications. The LM2705 is ideal for
LCD panels requiring low current and high efficiency as well
as white LED applications for cellular phone back-lighting.
The LM2705 can drive up to 3 white LEDs from a single
Li-Ion battery. The low peak inductor current of the LM2705
makes it ideal for USB applications.
Features
n 150mA, 0.7Ω, internal switch
n Uses small surface mount components
n Adjustable output voltage up to 20V
n 2.2V to 7V input range
n Input undervoltage lockout
n 0.01µA shutdown current
n Small 5-Lead SOT-23 package
Applications
n LCD Bias Supplies
n White LED Back-Lighting
n Handheld Devices
n Digital Cameras
n Portable Applications
Typical Application Circuit
FIGURE 1. Typical 20V Application
20039701
© 2003 National Semiconductor Corporation DS200397
www.national.com
1 page  
Typical Performance Characteristics (Continued)
Switch RDSON vs VIN
FB Trip Point and FB Pin Current vs Temperature
20039715
Output Voltage vs Load Current
Off Time vs Temperature
20039723
Step Response
20039727
Start-Up/Shutdown
20039741
VOUT = 20V, VIN = 3.0V
1) Load, 0.5mA to 5mA to 0.5mA, DC
2) VOUT, 200mV/div, AC
3) IL, 100mA/div, DC
T = 100µs/div
20039728
VOUT = 20V, VIN = 3.0V
1) SHDN, 1V/div, DC
2) IL, 100mA/div, DC
3) VOUT, 10V/div, DC
T = 400µs/div
RL = 3.9kΩ
5
20039729
www.national.com
5 Page 
Physical Dimensions inches (millimeters)
unless otherwise noted
5-Lead Small Outline Package (M5)
For Ordering, Refer to Ordering Information Table
NS Package Number MA05B
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
National Semiconductor
Americas Customer
Support Center
Email: [email protected]
Tel: 1-800-272-9959
www.national.com
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Europe Customer Support Center
Fax: +49 (0) 180-530 85 86
Email: [email protected]
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Tel: +65-6254 4466
National Semiconductor
Japan Customer Support Center
Fax: 81-3-5639-7507
Email: [email protected]
Tel: 81-3-5639-7560
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet LM2705.PDF ] | |
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