LM2750LD-ADJEV National Semiconductor, LM2750LD-ADJEV Datasheet

BOARD EVAL LM2750LD-ADJ

LM2750LD-ADJEV

Manufacturer Part Number
LM2750LD-ADJEV
Description
BOARD EVAL LM2750LD-ADJ
Manufacturer
National Semiconductor
Series
PowerWise®r
Datasheets

Specifications of LM2750LD-ADJEV

Main Purpose
DC/DC, Step Up
Outputs And Type
1, Non-Isolated
Voltage - Output
3.8 ~ 5.2V
Current - Output
120mA
Voltage - Input
2.7 ~ 5.6V
Regulator Topology
Boost
Frequency - Switching
1.7MHz
Board Type
Fully Populated
Utilized Ic / Part
LM2750
Lead Free Status / RoHS Status
Not applicable / Not applicable
Power - Output
-
Lead Free Status / Rohs Status
Not Compliant
© 2005 National Semiconductor Corporation
LM2750
Low Noise Switched Capacitor Boost Regulator
General Description
The LM2750 is a regulated switched-capacitor doubler that
produces a low-noise output voltage. The 5.0V output volt-
age option (LM2750-5.0) can supply up to 120mA of output
current over a 2.9V to 5.6V input range, as well as up to
40mA of output current when the input voltage is as low as
2.7V. An adjustable output voltage option with similar output
current capabilities is also available (LM2750-ADJ). The
LM2750 has been placed in National’s 10-pin LLP, a pack-
age with excellent thermal properties that keeps the part
from overheating under almost all rated operating conditions
A perfect fit for space-constrained, battery-powered applica-
tions, the LM2750 requires only 3 external components: one
input capacitor, one output capacitor, and one flying capaci-
tor. Small, inexpensive ceramic capacitors are recom-
mended for use. These capacitors, in conjunction with the
1.7MHz fixed switching frequency of the LM2750, yield low
output voltage ripple, beneficial for systems requiring a low-
noise supply. Pre-regulation minimizes input current ripple,
reducing input noise to negligible levels.
A tightly controlled soft-start feature limits inrush currents
during part activation. Shutdown completely disconnects the
load from the input. Output current limiting and thermal
shutdown circuitry protect both the LM2750 and connected
devices in the event of output shorts or excessive current
loads.
Typical Application Circuit
DS200351
Features
n Inductorless solution: Application requires only 3 small
n Fixed 5.0V output and adjustable output voltage options
n 85% Peak Efficiency
n Output Current up to 120mA with 2.9V ≤ V
n Wide Input Voltage Range: 2.7V to 5.6V
n Fixed 1.7MHz switching frequency for a low-noise,
n Pre-regulation minimizes input current ripple, keeping
n Tiny LLP package with outstanding power dissipation:
n Shutdown Supply Current less than 2µA
Applications
n White and Colored LED-based Display Lighting
n Cellular Phone SIM cards
n Audio Amplifier Power Supplies
n General Purpose Li-Ion-to-5V Conversion
ceramic capacitors
available
low-ripple output signal
the battery line (V
Usually no derating required.
70% Average Efficiency over Li-Ion Input Range
(2.9V-to-4.2V)
Output Current up to 40mA with 2.7V ≤ V
IN
) virtually noise-free
20035101
December 2005
IN
IN
www.national.com
≤ 2.9V
≤ 5.6V

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LM2750LD-ADJEV Summary of contents

Page 1

... LM2750 and connected devices in the event of output shorts or excessive current loads. Typical Application Circuit © 2005 National Semiconductor Corporation Features n Inductorless solution: Application requires only 3 small ceramic capacitors n Fixed 5.0V output and adjustable output voltage options ...

Page 2

... Ordering Option Information 5.0 LM2750LD-5.0 5.0 LM2750LDX-5.0 Adjustable LM2750LD-ADJ Adjustable LM2750LDX-ADJ 5.0 LM2750SD-5.0 5.0 LM2750SDX-5.0 Adjustable LM2750SD-ADJ Adjustable LM2750SDX-ADJ Note 1: LDA10A Package: 10 pad pullback LLP. SDA10A Package: 10 pad non-pullback LLP. For more details, refer to the package drawings in the Physical Dimensions section at the end of this datasheet. ...

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: Voltage to Ground IN SD Pin: Voltage to GND Junction Temperature (T ) J-MAX-ABS Continuous Power Dissipation (Note 4) Maximum Output Current (Note 5) Storage Temperature Range Maximum Lead Temperature (Soldering, 5 sec ...

Page 4

Electrical Characteristics Typical values and limits in standard typeface apply for T temperature range. Unless otherwise specified: 2.9V ≤ 1µ 1µF (Note 10). OUT Symbol Parameter Capacitor Requirements Required Input C IN ...

Page 5

Block Diagram 5 20035103 www.national.com ...

Page 6

Typical Performance Characteristics 2.2µ 1.0µ 2.2µF. Capacitors are low-ESR multi-layer ceramic capacitors (MLCC’s). FLY OUT Output Voltage vs. Output Current Output Voltage vs. Input Voltage Input Current vs. Output Current www.national.com Unless otherwise specified: V Output ...

Page 7

Typical Performance Characteristics 2.2µ 1.0µ 2.2µF. Capacitors are low-ESR multi-layer ceramic capacitors (MLCC’s). (Continued) FLY OUT Current Limit Behavior Output Voltage Ripple Turn-on Behavior Unless otherwise specified: V 20035121 Output Voltage Ripple, I 20035112 20035114 7 ...

Page 8

Operation Description OVERVIEW The LM2750 is a regulated switched capacitor doubler that, by combining the principles of switched-capacitor voltage boost and linear regulation, generates a regulated output from an extended Li-Ion input voltage range. A two-phase non-overlapping clock generated internally ...

Page 9

Operation Description increases to the point that there is zero voltage drop across the regulator, V’ equals the input voltage, and the output voltage is "on the edge" of regulation. Additional output current causes the output voltage to fall out ...

Page 10

Operation Description Application Information OUTPUT VOLTAGE RIPPLE The amount of voltage ripple on the output of the LM2750 is highly dependent on the application conditions: output cur- rent and the output capacitor, specifically. A simple approxi- mation of output ripple ...

Page 11

Application Information Manufacturer Contact Information TDK www.component.tdk.com AVX www.avx.com Murata www.murata.com Taiyo-Yuden www.t-yuden.com Vishay-Vitramon www.vishay.com INPUT CAPACITOR The input capacitor ( used as a reservoir of charge, IN helping to quickly transfer charge to the flying capacitor during ...

Page 12

Application Information FIGURE 3. LM2750 Model for Power Efficiency and Power Dissipation Calculations LAYOUT RECOMMENDATIONS A good board layout of the LM2750 circuit is required to achieve optimal assembly, electical, and thermal dissipation perfromance. Figure example of ...

Page 13

LM2750 LED Drive Application FIGURE 5. LM2750-5.0 LED Drive Application Circuit FIGURE 6. LM2750-ADJ LED Drive Application Circuit The LM2750 is an excellent part for driving white and blue LEDs for display backlighting and other general-purpose lighting functions. The circuits ...

Page 14

LM2750 LED Drive Application (Continued) PWM BRIGHTNESS/DIMMING CONTROL Brightness of the LEDs can be adjusted in an application by driving the SD pin of the LM2750 with a PWM signal. When the PWM signal is high, the LM2750 is ON, ...

Page 15

Datasheet Revision History REV. # DATE 1.0 1.1 09/24/2004 1.2 09/28/2005 1.3 12/21/2005 Physical Dimensions inches (millimeters) unless otherwise noted COMMENTS Production Release of LM2750 Datasheet Preliminary version with the following additions: • SDA10A Non-pullback package Added (pgs 2, 16) ...

Page 16

... 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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