LM27965 Datasheet PDF - National Semiconductor
| Part Number | LM27965 | |
| Description | Dual Display White LED Driver with I2C Compatible Brightness Control | |
| Manufacturers | National Semiconductor | |
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May 2006
LM27965
Dual Display White LED Driver with I2C Compatible
Brightness Control
General Description
Features
The LM27965 is a highly integrated charge-pump-based
dual-display LED driver. The device can drive up to 9 LEDs
in parallel with a total output current of 180mA. Regulated
internal current sinks deliver excellent current and brightness
matching in all LEDs.
The LED driver current sinks are split into three indepen-
dently controlled groups. The primary group can beconfig-
urabled with 4 or 5 LEDs, for backlighting a larger main
display and the second group can be configured with 2 or 3
LEDs, for backlighing a smaller secondary display. An addi-
tional, independently controlled led driver is provided for
driving an indicator or general purpose LED. The LM27965
has an I2C compatible interface that allows the user to
independently control the brightness on each bank of LEDs.
n 91% Peak LED Drive Efficiency
n No Inductor Required
n 0.3% Current Matching
n Drives LEDs with up to 30mA per LED
n 180mA of total drive current
n I2C Compatible Brightness Control Interface
n Adaptive 1x - 3/2x Charge Pump
n Resistor-Programmable Current Settings
n External Chip RESET Pin
n Extended Li-Ion Input: 2.7V to 5.5V
n Small low profile industry standard leadless package,
LLP 24 : (4mm x 4mm x 0.8mm)
n 25mm2 total solution size
The device provides excellent efficiency without the use of
an inductor by operating the charge pump in a gain of 3/2, or Applications
in Pass-Mode. The proper gain for maintaining current regu-
lation is chosen based on LED forward voltage, so that
efficiency is maximized over the input voltage range.
The LM27965 is available in National’s small 24-pin Lead-
n Mobile Phone Display Lighting
n PDA Backlighting
n General LED Lighting
less Leadframe Package (LLP-24).
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Typical Application Circuit
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© 2006 National Semiconductor Corporation
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20155001
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Electrical Characteristics (Notes 2, 8) (Continued)
Note 11: For the two groups of current sinks on a part (BankA and BankB), the following are determined: the maximum sink current in the group (MAX), the minimum
sink current in the group (MIN), and the average sink current of the group (AVG). For each group, two matching numbers are calculated: (MAX-AVG)/AVG and
(AVG-MIN)/AVG. The largest number of the two (worst case) is considered the matching figure for the bank. The matching figure for a given part is considered to
be the highest matching figure of the two banks. The typical specification provided is the most likely norm of the matching figure for all parts.
Note 12: For each Dxx pin, headroom voltage is the voltage across the internal current sink connected to that pin. For Group A, B, and C current sinks, VHRx = VOUT
-VLED. If headroom voltage requirement is not met, LED current regulation will be compromised.
Note 13: SCL and SDIO signals are referenced to VIO and GND for minimum VIO voltage testing.
Note 14: SCL and SDIO should be glitch-free in order for proper brightness control to be realized.
Block Diagram
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for LM27965 electronic component. |
| Information | Total 13 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ LM27965.PDF Datasheet ] | |
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