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Eutech Microelectronics

EUP3654 Datasheet Preview

EUP3654 Datasheet

1X/1.5X Charge Pump White LED Driver

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Preliminary
EUP3654
6 Channel, 1X/1.5X Charge Pump
White LED Driver
DESCRIPTION
The EUP3654 is a high efficiency charge pump white
LED driver. It supports 6 white LEDs with regulated
constant current for uniform intensity. The EUP3654
maintains the highest efficiency by utilizing a 1.5X
fractional charge pump and low dropout current
regulators. A low external parts count (two 2.2uF flying
capacitors and two small 2.2uF capacitors at VIN and
VOUT) makes the EUP3654 ideally suited for small
battery-powered applications.The charge pump
provides backlight current utilizing six matched current
sinks. The load and supply conditions determine
whether the charge pump operates in 1x, 1.5x mode.
The EUP3654 uses single wire serial pulse interface
which controls all functions of the device, including
enabling the part and setting LED driver’s current level
with 32 steps.
The EUP3654 also provides an external PWM dimming
control while DPWM duty cycle is controlled directly
from an external PWM signal, adjusting brightness
further based on image contents. And Direct PWM
dimming signal frequency range is from 200Hz to
1KHz.
With a 3mm × 3mm TQFN-16 package and 4 small
capacitors, the EUP3654 provides a complete LED
driver solution with a minimal PCB footprint.
Typical Application Circuit
FEATURES
1X/1.5X Mode for Ultra-High Efficiency
0.5mA to 25mA Output Current for Each
Channel
2.7V to 5.5V Input Voltage
1MHz Fixed Switching Frequency
Single-Wire Serial Pulse Interface to Set LED
Current with 32-Step Scale
External PWM Dimming with 200Hz - 1KHz
Frequency Range
High Backlight Current Matching ±0.5% Typical
High Backlight Current Accuracy ±1.5% Typical
Soft Start Function
Built-In Short-Circuit Protection
Built-in Thermal Protection
IQ<1uA in Shutdown
TQFN 3mm × 3mm TQFN-16 package
RoHS Compliant and 100% Lead(Pb)-Free
Halogen-Free
APPLICATIONS
Cell phones, smart phones, and PDAs
Portable media players
Digital cameras and GPS units
Small LCD Backlighting
Display/keypad backlighting and LED
indicators
DS3654 ver0.1 Nov. 2009
Figure1.
1




Eutech Microelectronics

EUP3654 Datasheet Preview

EUP3654 Datasheet

1X/1.5X Charge Pump White LED Driver

No Preview Available !

Pin Configurations
Package Type
TQFN-16
Preliminary
Pin Configurations
EUP3654
Pin Description
PIN TQFN-16
1 BL3
2 BL4
3 BL5
4 BL6
5 EN
6 PWM
7 GND
8 C2-
9 NC
10 C1-
11 C1+
12 C2+
13 OUT
14 IN
15 BL1
16 BL2
DESCRIPTION
Current sink output for LED 3— connect this pin to OUT if unused
Current sink output for LED 4— connect this pin to OUT if unused
Current sink output for LED 5— connect this pin to OUT if unused
Current sink output for LED 6— connect this pin to OUT if unused
Serial interface line for 32step backlighting current
External direct PWM dimming pin
Ground Pin
Negative connection to bucket capacitor 2 — requires a capacitor connected to C2+
Non-connect pin
Negative connection to bucket capacitor 1 — requires a capacitor connected to C1+
Positive connection to bucket capacitor 1 — requires a capacitor connected to C1-
Positive connection to bucket capacitor 2 — requires a capacitor connected to C2-
Charge Pump output — all LED anode pins should be connected to this pin — requires
a capacitor to GND
Battery Voltage input — requires a capacitor to GND
Current sink output for LED 1— connect this pin to OUT if unused
Current sink output for LED 2— connect this pin to OUT if unused
DS3654 ver0.1 Nov. 2009
2


Part Number EUP3654
Description 1X/1.5X Charge Pump White LED Driver
Maker Eutech Microelectronics
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EUP3654 Datasheet PDF






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