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LM2794

Features: `Regulated current sources with ±0.5% matching between any two outputs`High efficiency 3/2 boost function`Drives one, two, three or four white LEDs`2.7V to 5.5V Input Voltage`Up to 80mA output current`Analog brightness control`Active-low or high shutdown input ('94/95)`Very small solutio...

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SeekIC No. : 004395063 Detail

LM2794: Features: `Regulated current sources with ±0.5% matching between any two outputs`High efficiency 3/2 boost function`Drives one, two, three or four white LEDs`2.7V to 5.5V Input Voltage`Up to 80mA ou...

LM2794 Data Sheet

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Part Number:
LM2794
Supply Ability:
5000

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  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2025/3/13

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Product Details

Description



Features:

`Regulated current sources with ±0.5% matching between any two outputs
`High efficiency 3/2 boost function
`Drives one, two, three or four white LEDs
`2.7V to 5.5V Input Voltage
`Up to 80mA output current
`Analog brightness control
`Active-low or high shutdown input ('94/95)
`Very small solution size and no inductor
`2.3A (typ.) shutdown current
`325kHz switching frequency (min.)
`Constant Frequency generates predictable noise spectrum
`Standard Micro SMD-14 package: 2.08mm X 2.403mm X 0.845mm High
`Thin Micro SMD-14 package: 2.08mm X 2.403mm X 0.600mm High




Application

·White LED Display Backlights
·White LED Keypad Backlights
·1-Cell Li-Ion battery-operated equipment including PDAs, hand-held PCs, cellular phones




Specifications

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
VIN ...................................................−0.5 to 6.2V max
SD ...........................................−0.5 to (VIN+0.3V) w/
...............................................................6.2V max
BRGT .......................................−0.5 to (VIN+0.3V) w/
..............................................................6.2V max
Continuous Power Dissipation
(Note 2) ..........................................Internally Limited
TJMAX (Note 2) ..................................................135
JA (Notes 2, 3)............................................ 125/W
Storge Temperature......................... −65 to +150
Lead Temp. (Soldering, 5 sec.) ..........................260
ESD Rating (Note 4)
Human Body Model ..............................................2kV
Machine Model ...................................................200V

Regulated LEDs 4
Total LED Current 80 mA
Current Matching 0.5%
Boost Type Switched Capacitor 1.5x
Switching Frequency 515 kHz
Efficiency (peak) 80 %
Input Min Voltage 2.7 Volt
Input Max Voltage 5.5 Volt
Boost Voltage Unregulated
LED Configuration Parallel
Supply Current 5.5 mA
Switching Type Fixed Freq
Special Features Active low shutdown
PWM BrightCtrl Yes
Analog-V BrightCtrl Yes
Ambient Light Compensation No
RGB-LED No
Temperature Min -30 deg C
Temperature Max 85 deg C
RegType WhiteLED Driver
PowerWise No
View Using Catalog





Description

The LM2794/95 is a fractional CMOS charge-pump that provides four regulated current sources. It accepts an input voltage range from 2.7V to 5.5V and maintains a constant current determined by an external sense resistor. The LM2794/5 delivers up to 80mA of load current to accommodate four White LEDs. The switching frequency is 325kHz. (min.) to keep the conducted noise spectrum away from sensitive frequencies within portable RF devices. Brightness can be controlled by both linear and PWM techniques. A voltage between 0V and 3.0V may be applied to the BRGT pin to linearly vary the LED current. Alternatively, a PWM signal can be applied to the SD pin to vary the perceived brightness of the LED. The SD pin reduces the operating current to 2.3A (typ.) The LM2794 is shut down when the SD pin is low, and the LM2795 is shut down when the SD pin is high.

The LM2794/95 is available in a micro SMD-14 CSP package.






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