LM2751SDX-B/NOPB National Semiconductor, LM2751SDX-B/NOPB Datasheet

IC LED DRIVR WHITE BCKLGT 10-LLP

LM2751SDX-B/NOPB

Manufacturer Part Number
LM2751SDX-B/NOPB
Description
IC LED DRIVR WHITE BCKLGT 10-LLP
Manufacturer
National Semiconductor
Type
Backlight, White LEDr
Datasheet

Specifications of LM2751SDX-B/NOPB

Topology
PWM, Switched Capacitor (Charge Pump)
Number Of Outputs
1
Internal Driver
Yes
Type - Primary
Backlight
Type - Secondary
White LED
Frequency
725kHz
Voltage - Supply
2.8 V ~ 5.5 V
Voltage - Output
4.5V
Mounting Type
Surface Mount
Package / Case
10-LLP
Operating Temperature
-40°C ~ 85°C
Current - Output / Channel
150mA
Internal Switch(s)
Yes
Efficiency
90%
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
LM2751SDX-B

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LM2751SDX-B/NOPB
Manufacturer:
UMC
Quantity:
6 241
© 2005 National Semiconductor Corporation
LM2751
Regulated 2X, 1.5X Switched Capacitor White LED Driver
General Description
The LM2751 is a constant frequency switched capacitor
charge pump with regulated output voltage options of 4.5V,
and 5.0V. Over the input voltage range of 2.8V to 5.5V the
LM2751 provides up to 150mA of output current and requires
only four low-cost ceramic capacitors.
The LM2751 provides excellent efficiency without the use of
an inductor by operating the charge pump in a gain of 3/2 or
2. The proper gain for maintaining regulation is chosen so
that efficiency is maximized over the input voltage range.
LM2751 uses constant frequency pre-regulation to minimize
conducted noise on the input and provide a predictable
switching frequency. The switching frequency is program-
mable to 725kHz, 300kHz, 37kHz, or 9.5kHz.
LM2751 is available in a 10-pin Leadless Leadframe No-
Pullback Package: LLP-10.
Typical Application Circuit
DS201121
LM2751 2x/1.5x Efficiency vs.
2x Charge Pump Effciency
Features
n Regulated Output Options: 4.5V, 5.0V
n Output Voltage Regulated within 3%
n Peak Efficiency Over 90%
n 150mA (4.5V) or 80mA (5.0V) Output Current Capability
n Input Voltage Range: 2.8V to 5.5V
n Low Input and Output Voltage Ripple
n
n Small Solution Size - NO INDUCTOR
n Programmable 725kHz, 300kHz, 37kHz, or 9.5kHz
n 10-pin LLP No-Pullback Package: 3mm x 3mm x 0.8mm
Applications
n White LED Display Backlights
n White LED Keypad Backlights
n General Purpose 2x, 1.5x Regulated Charge Pump
Switching Frequencies
<
1µA Typical Shutdown Current
20112128
20112101
www.national.com
April 2005

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LM2751SDX-B/NOPB Summary of contents

Page 1

... The switching frequency is program- mable to 725kHz, 300kHz, 37kHz, or 9.5kHz. LM2751 is available in a 10-pin Leadless Leadframe No- Pullback Package: LLP-10. Typical Application Circuit © 2005 National Semiconductor Corporation Features n Regulated Output Options: 4.5V, 5.0V n Output Voltage Regulated within 3% n Peak Efficiency Over 90% n 150mA (4 ...

Page 2

... Voltage Option A 5.0V A 5.0V B 4.5V B 4.5V www.national.com 3mm x 3mm x 0.8mm NS Package Number SDA10A Description Order Number Package Marking LM2751SD-A XXXXX YYYYY = L145B LM2751SDX-A LM2751SD-B XXXXX YYYYY = L146B LM2751SDX-B 2 20112102 Supplied As Tape and Reel 1000 Units 4500 Units 1000 Units 4500 Units ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. V Pin IN EN, CS0, CS1 Pins Continuous Power Dissipation (Note 3) Junction Temperature (T ) J-MAX-ABS Storage Temperature Range Maximum Lead Temperature (Soldering, 10sec.) ESD Rating (Note 4) ...

Page 4

Electrical Characteristics Limits in standard typeface are for T (-40˚C ≤ T ≤ +85˚C) . Unless otherwise noted, specifications apply to the LM2751 Typical Application Circuit (pg. 1) with 3.6V, V(EN CS0 = CS1 = ...

Page 5

Block Diagram 5 20112103 www.national.com ...

Page 6

Typical Performance Characteristics CS1 = V , V(EN OUT Output Voltage vs. Output Current, Version A (5V), 300kHz Output Voltage vs. Output Current, Version A (5V), 725kHz Input Current vs. Input ...

Page 7

Typical Performance Characteristics = V , V(EN 2.2µ OUT Output Voltage vs. Input Voltage, Version A (5V), 300kHz Output Voltage vs. Input Voltage, Version A (5V), 725kHz Efficiency vs. ...

Page 8

Typical Performance Characteristics = V , V(EN 2.2µ OUT Output Voltage Ripple vs. Input Voltage Version B (4.5V), Load = 120mA Line Step Response, Version B (4.5V ...

Page 9

Application Information CIRCUIT DESCRIPTION The LM2751 is a Switched Capacitor Convertor with gains of 2x and 1.5x capable of continuously supplying up to 150mA at 4. 80mA at 5V depending on the output voltage option. ...

Page 10

Application Information The voltage rating of the output capacitor should be 10V or more. All other capacitors should have a voltage rating at or above the maximum input voltage of the application. DRIVING WHITE LEDS The desired LED current is ...

Page 11

... BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...

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