LM27953TL ,White LED Driver with Four LED Current Sinks and 3/2x Switched Capacitor BoostFeaturesn Drives 4 Individual Common-Anode LEDs with up toTheLM27953isacharge-pump-basedwhite-LEDdr ..
LM27953TLX ,White LED Driver with Four LED Current Sinks and 3/2x Switched Capacitor BoostApplicationsindependently with an external resistor.n Mobile Phone Display LightingThe LM27953 work ..
LM2795BL ,Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness ControlPin DescriptionPin(*) Name FunctionA1 C1+ Positive terminal of C1B2 C1− Negative terminal of C1C1 V ..
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LM62BIM3 ,2.7V, 15.6mV/deg C, SOT-23 Temperature SensorapplicationsThe LM62 is a precision integrated-circuit temperature sen-sor that can sense a 0˚C to ..
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LM27953TL-LM27953TLX
White LED Driver with Four LED Current Sinks and 3/2x Switched Capacitor Boost
LM27953
White LED Driver with Four LED Current Sinks and 3/2x
Switched Capacitor Boost
General DescriptionThe LM27953isa charge-pump-based white-LED driver that idealfor mobile phone display backlighting.Itis intended drive4 LEDsfora main phone display backlight. Regu-
lated internal current sources deliver excellent current and
brightness matchinginall LEDs.
The LED driver current sinks canbe usedto backlighta main
phone display withupto4 LEDs. The low-side current
drivers accommodate common-anode-type LEDs. The cur-
rent sinks can also drive standard two-terminal LEDs, and
provide other general lighting functions (keypad lighting,fun
lighting, etc). The brightnessof the LEDs canbe adjusted
independently withan external resistor.
The LM27953 worksoffan extended Li-Ion input voltage
range (2.7Vto 5.5V). Voltage boostis achieved witha high-
efficiency 3/2x-gain charge pump.
The LM27953is availablein National’s chip-scale 18-bump
micro SMD package.
Features Drives4 Individual Common-Anode LEDs withupto
20mA eachfora Main Display Backlight Independent Resistor-Programmable Current Setting Excellent Current and Brightness Matching High-Efficiency 3/2x Charge Pump Extended Li-Ion Input: 2.7Vto 5.5V PWM Brightness Control: 100Hz- 1kHz 18-bump Thin Micro SMD Package:
(2.1mmx 2.4mmx 0.6mm)
Applications Mobile Phone Display Lighting Mobile Phone Keypad Lighting PDAs General LED Lighting
Typical Application CircuitNovember 2004
LM27953
White
LED
Driver
with
Four
LED
Current
Sinks
and
3/2x
Switched
Capacitor
Boost
