lm4510sdx National Semiconductor Corporation, lm4510sdx Datasheet

no-image

lm4510sdx

Manufacturer Part Number
lm4510sdx
Description
Synchronous Step-up Dc/dc Converter With True Shutdown Isolation
Manufacturer
National Semiconductor Corporation
Datasheet

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
lm4510sdx/NOPB
0
© 2007 National Semiconductor Corporation
LM4510
Synchronous Step-Up DC/DC Converter with True
Shutdown Isolation
General Description
The LM4510 is a current mode step-up DC/DC converter with
a 1.2A internal NMOS switch designed to deliver up to 120
mA at 16V from a Li-Ion battery.
The device's synchronous switching operation (no external
Schottky diode) at heavy-load, and non-synchronous switch-
ing operation at light-load, maximizes power efficiency.
True shutdown function by synchronous FET and related cir-
cuitry ensures input and output isolation.
A programmable soft-start circuit allows the user to limit the
amount of inrush current during startup. The output voltage
can be adjusted by external resistors.
The LM4510 features advanced short-circuit protection to
maximize safety during output to ground short condition. Dur-
ing shutdown the feedback resistors and the load are discon-
nected from the input to prevent leakage current paths to
ground.
The LM4510 is available in a 10-pin thermally enhanced
Leadless Leadframe Package: LLP-10.
Typical Application Circuit
300310
FIGURE 1. Typical Application Circuit
Features
Applications
18V@80 mA from 3.2V input
5V@280 mA from 3.2V input
No external Schottky diode required
85% peak efficiency
Soft start
True shutdown isolation
Stable with small ceramic or tantalum output capacitors
Output short-circuit protection
Feedback fault protection
Input under-voltage lock out
Thermal shutdown
0.002 µA shutdown current
Wide input voltage range: 2.7V to 5.5V
1.0 MHz fixed frequency operation
Low-profile 10–pin LLP package (3mm x 3mm x 0.8mm)
Organic LED Panel Power Supply
Charging Holster
White LED Backlight
USB Power Supply
Class D Audio Amplifier
Camera Flash LED Driver
30031001
www.national.com
October 2007

Related parts for lm4510sdx

lm4510sdx Summary of contents

Page 1

... The LM4510 is available in a 10-pin thermally enhanced Leadless Leadframe Package: LLP-10. Typical Application Circuit © 2007 National Semiconductor Corporation Features ■ 18V@80 mA from 3.2V input ■ 5V@280 mA from 3.2V input ■ ...

Page 2

... Connection Diagram Ordering Information Order Number SPEC Package Type LM4510SD NOPB LLP-10 LM4510SDX NOPB LLP-10 Pin Descriptions/Functions Pin Name 1 SW Switch pin. Drain connections of both internal NMOS and PMOS devices. 2 PGND Power ground 3 VIN Analog and Power supply input. Input range: 2.7V to 5.5V. ...

Page 3

Pin Name 8 FB Output voltage feedback connection. 9 N/C No internal connection. 10 VOUT Internal PMOS source connection for synchronous rectification. DAP DAP Die Attach Pad thermal connection Function 3 www.national.com ...

Page 4

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. VIN VOUT SW (Note 3) EN, SS, COMP FB PGND to AGND Continuous Power Dissipation (Note 4) Junction Temperature ...

Page 5

Note 1: Absolute maximum ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions for which the device is intended to be functional, but device parameter specifications may not be guaranteed. For guaranteed specifications and ...

Page 6

Typical Performance Characteristics LM4510SD, Circuit of Figure 1, (L=4.7 µH, COILCRAFT, DO3316-472ML; C 12103D106KAT2A; C =10 nF, TDK, C1608C0G1E103J 9t06031A4642FBHFT), V =3.6V Switching Quiescent Current vs V Load Capabilty ...

Page 7

Switching Frequency vs Temperature Load Regulation ( OUT Line Regulation ( OUT Load Regulation (V 30031011 Line Regulation (V 30031034 Efficiency vs Output Current (V 30031033 OUT ...

Page 8

Efficiency vs Output Current ( OUT Line Transient Response ( OUT Start OUT LOAD www.national.com 30031031 30031003 = 530 Ω) 30031007 8 Efficiency vs Output Current ...

Page 9

Short Circuit Response ( OUT 30031008 Output Voltage Ripple ( 100 mA) OUT OUT 30031099 Output Voltage Ripple ( mA) OUT OUT 9 30031098 www.national.com ...

Page 10

Block Diagram Operation Description LM4510 is a peak current-mode, fixed-frequency PWM boost regulator that employs both Non-Synchronous Switching. The DC/DC regulator regulates the feedback output voltage providing excellent line and load transient response. The op- eration of the LM4510 can ...

Page 11

Synchronous boost converter is shown in Figure 3. At the start of each cycle, the oscillator sets the driver logic and turns on the NMOS power device and turns off the PMOS power de- vice. Cycle 1 Description Refer to ...

Page 12

TABLE 1. Suggested Component Values for Different Output Voltages Output Voltage ( 3.3 MAXIMUM OUTPUT CURRENT When the output voltage is set at different level important to know the maximum load capability. By first order ...

Page 13

The output capacitor should be capable of handling the RMS current. The ESR and ESL of the output capacitor directly control the output ripple. Use capacitors with low ESR and ESL at the TABLE 3. Suggested C Model 4.7 µF ...

Page 14

TABLE 4. Suggested C Model ) C1608C0G1E103J ( )TMK107SD222JA 9t06031A4642FBHFT (R C LAYOUT CONSIDERATIONS AND THERMAL MANAGEMENT FIGURE 7. Evaluation Board Layout High frequency switching regulators require very careful lay- out of components in order to ...

Page 15

FIGURE 8. Flash/Torch Circuit Using LM4510 15 30031028 www.national.com ...

Page 16

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 10-pin LLP Package For Ordering, Refer to Ordering Information Table NS Package Number SDA10A 3mm x 3mm x 0.8mm 16 ...

Page 17

Notes 17 www.national.com ...

Page 18

... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

Related keywords