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SP6682 Datasheet Preview

SP6682 Datasheet

High Efficiency White LED Charge Pump Regulator

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February 2009
SP6682
High Efficiency White LED Charge Pump Regulator
Rev. 2.0.0
GENERAL DESCRIPTION
The SP6682 is a current regulated charge
pump ideal for converting a Li-Ion battery
input for driving white LEDs used in
backlighting color displays or cell phone
camera flash applications.
The charge pump automatically switches
between x1.5 and x2 modes based on the
program-mable VMODE voltage, providing
improved efficiency over traditional methods
using charge pump doubler followed by LDO.
This input voltage threshold can be externally
programmed by a resistor divider network for
optimized efficiency at specific output voltages
and currents.
The SP6682 operates with an internal 600kHz
clock, which reduces switching noise and
improves VOUT ripple. Output current or
voltage can be accurately regulated by
modulating the switcher between the charge
pump and output capacitor. In shutdown
mode, the IC disconnects the output from the
input and draws less than 1.5μA current.
The SP6682 is offered in a 10-pin MSOP
package, and a small 10-Pin DFN Package.
APPLICATIONS
Mobile Phones & PDAs
3.3V to 5V Conversion
Palmtop Computers
Color LCD Modules
FEATURES
200mA Output Current
Low Profile Inductorless Regulator
600KHz Oscillator
x1.5 and x2 Conversion Modes
2.7V to 5.5V Input Voltage Range
Fast Turn-on Time 175µs
1mA Quiescent Current
Adjustable Output Current and Voltage
PWM Dimming Control
True Shutdown Disconnect
Soft Start
10-pin MSOP and 10-pin DFN Packages
TYPICAL APPLICATION DIAGRAM
Fig. 1: SP6682 LCD Backlighting Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. +1 510 668-7000 – Fax. +1 510 668-7001




Exar

SP6682 Datasheet Preview

SP6682 Datasheet

High Efficiency White LED Charge Pump Regulator

No Preview Available !

SP6682
High Efficiency White LED Charge Pump Regulator
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of
the device at these ratings or any other above those
indicated in the operation sections of the specifications
below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may affect
reliability.
VIN, VMODE, VOUT, EN/PWM ............................ -0.3V to 6.0V
VIN - VOUT .............................................................. 0.7V
Output Current IOUT ............................................ 300mA
Power Dissipation (10-pin MSOP)
(derated 8.84mW/°C above +70°C) .....................720mW
Junction Temperature Range .............................. +125°C
Storage Temperature ..............................-65°C to 150°C
ESD Rating (HBM - Human Body Model) .................... 2kV
ELECTRICAL SPECIFICATIONS
Specifications with standard type are for an Operating Ambient Temperature of TA = 25°C only; limits applying over the full
Operating Ambient Temperature range are denoted by a “•”. Minimum and Maximum limits are guaranteed through test,
design, or statistical correlation. Typical values represent the most likely parametric norm at TA = 25°C, and are provided
for reference purposes only. Unless otherwise indicated, VIN = 2.7V to 5.0V, C1=C2=C4=C5=2.2µF (ceramic, ESR=0.03),
C3=0.1µF (ceramic), TA= –40°C to 85°C.
Parameter
Input Voltage
Quiescent Current
Shutdown Current
Oscillator Frequency
VFB Reference Voltage
Charge Pump Output Resistence
VMODE Threshold Voltage
Hysteresis for Mode Transition
Voltage
VMODE Pin Current
EN/PWM Logic Low
EN/PWM Logic High
EN/PWM Pin Current
FB Pin Current
VOUT Turn-On Time
Min.
2.7
0.42
0.275
1.15
1.6
Typ.
1.2
0.60
0.306
11
1.25
30
0.01
0.01
175
Max.
5.5
3
1.5
0.78
0.337
18
1.35
0.5
0.4
0.5
0.5
500
Units
V
mA
µA
MHz
V
V
mVPP
µA
V
V
µA
µA
µs
Conditions
• VIN=4.2V, VOUT=3.6V, IOUT=100 µA
• EN/PWM=0V, VIN=5.5V
• VIN=3.6V
FB=0V, VIN=3.6V, IOUT=20mA,
VMODE=High
VIN falling @ 25°C
VIN = 3.6V @ 25°C
• VMODE=1.25V
• VEN/PWM=4.2V
• VFB=1V
• VIN=3.6V, FB within 90% regulation
PIN ASSIGNEMENT
© 2009 Exar Corporation
Fig. 2: SP6682 Pin Assignement
2/13
Rev. 2.0.0


Part Number SP6682
Description High Efficiency White LED Charge Pump Regulator
Maker Exar
Total Page 13 Pages
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