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SP6682 Datasheet Preview

SP6682 Datasheet

High Efficiency Charge Pump Regulator for White LEDs

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® SP6682
High Efficiency Charge Pump Regulator
for White LEDs
FEATURES
Ideal For White LED Driver
Low Profile, Inductorless Regulator
X1.5 and X2 Modes for Highest Efficiency
+2.7V to +5.5V Input Voltage Range
Fast Turn-On Time, 175µS
1mA Quiescent Current
<1.5µA Shutdown Current
Built-in 600kHz Oscillator
Programmable Output Current or Voltage
PWM Dimming Control with Enable Pin
Shutdown to Disconnect Output from Input
Soft Start to Eliminate In-Rush Current
Industry Standard 10-pin MSOP Package
and Small 10-pin DFN Package
VOUT 1
C1P 2
VIN
VMODE
FB
3
4
5
10 C2P
SP6682
10 Pin DFN
9 C1N
8 GND
7 C2N
6 EN/PWM
Now Available in Lead Free Packaging
APPLICATIONS
Next Generation Mobile Phones
PDAs
3.3V to 5.0V Conversion
Digital Still Cameras
Digital Camcorders
Palmtop Computers
Color LCD Modules
DESCRIPTION
The SP6682 is a current regulated charge pump ideal for converting a Li-Ion battery input for
driving white LED used in backlighting color displays. The charge pump automatically switches
between X1.5 and X2 modes based on the input voltage, providing improved efficiency over
traditional methods using charge pump doubler followed by LDO. This input voltage threshold
can be externally programmed for optimized efficiency at specific output voltages and currents.
The SP6682 operates with an internal 600kHz clock, enabling the use of small external
components. 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.
TYPICAL APPLICATION SCHEMATIC
C2
2.2µF
2.7 - 4.2V
Lithium-Ion
C1
2.2µF
R1
R2
ENABLE/PWM DIMMING
R3
1M
®
1 VOUT
C2P 10
2 C1P SP6682 C1N 9
3 VIN
4 VMODE
5 FB
GND 8
C2N 7
6
EN/PWM
C3
0.1µF
C6
0.1µF
C4
2.2µF C5
2.2µF
White
LED
R6
20 20 20 20
Date: 5/5/04
SP6682 High Efficiency Charge Pump Regulator for White LEDs
1
© Copyright 2004 Sipex Corporation




Sipex

SP6682 Datasheet Preview

SP6682 Datasheet

High Efficiency Charge Pump Regulator for White LEDs

No Preview Available !

VIN, VMODE, VOUT and EN/PWM ................. -0.3V to 6V
VIN - VOUT ........................................................... 0.7V
Output Current (IOUT) ...................................... 120mA
Power Dissipation per Package - 10-pin MSOP
(derate 8.84mW/°C above +70°C) ................. 720mW
Junction Temperature .................................... +125°C
Storage Temperature ...................... -65°C to +150°C
ESD Rating. ................................................ 2kV HBM
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.
ELECTRICAL CHARACTERISTICS
Unless otherwise specified: VIN =+2.7V to +5.0V, C1=C2=C4=C5=2.2µF (ceramic, ESR=0.03), C3=0.1µF
(ceramic) and TAMB =-40°C to +85°C unless otherwise noted.
PARAMETER
MIN TYP MAX UNITS
CONDITIONS
Input Voltage
2.7 5.5 V
Quiescent Current
Shutdown Current
Oscillator Frequency
VFB Reference Voltage
Charge Pump Output
Resistance
VMODE Threshold Voltage
Hysteresis for Mode Transition
Voltage
0.42
0.275
1.15
1.2
0.60
0.306
11
1.25
30
3
1.5
0.78
0.337
18
1.35
mA
µA
MHz
V
V
mVPP
VIN = 4.2V, VOUT = 3.6V, IOUT = 100µA
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 Pin Current
EN/PWM Logic Low
0.01 0.5
0.4
µA VMODE = 1.25
V
EN/PWM Logic High
1.6
V
EN/PWM Pin Current
FB Pin Current
VOUT Turn-On Time
0.01 0.5
0.5
175 500
µA VEN/PWM = 4.2V
µA VFB = 1V
µs VIN = 3.6V, FB within 90% regulation
Date: 5/5/04
SP6682 High Efficiency Charge Pump Regulator for White LEDs
2
© Copyright 2004 Sipex Corporation


Part Number SP6682
Description High Efficiency Charge Pump Regulator for White LEDs
Maker Sipex
Total Page 12 Pages
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