Analogic AAT3166 High efficiency 1x/1.5x/2x charge pump for white led application Datasheet

AAT3166
High Efficiency 1X/1.5X/2X Charge
Pump for White LED Applications
General Description
Features
The AAT3166 is a low noise, constant frequency
charge pump DC/DC converter that uses a trimode load switch (1X), fractional (1.5X), and doubling (2X) conversion to maximize efficiency for
white LED applications. The AAT3166 is capable of
driving four LEDs for a total of 108mA from a 2.7V
to 5.5V input. The current sinks may be operated
individually or in parallel for driving higher-current
LEDs. A low external parts count (two 1µF flying
capacitors and two small 1µF capacitors at IN and
OUTCP) make this part ideally suited for small,
battery-powered applications.
•
•
•
•
•
•
•
•
•
•
•
•
•
AnalogicTech's AS2Cwire™ (Advanced Simple Serial
Control™) serial digital input is used to enable, disable, and set current for each LED with a 16-level
logarithmic scale plus four low-current settings down
to 115µA. For optimized efficiency, low-current settings require only 50µA of housekeeping current.
Each output of the AAT3166 is equipped with builtin protection for output short-circuit and auto-disable for load short-circuit condition. Built-in softstart circuitry prevents excessive inrush current
during start-up. A low-current shutdown feature disconnects the load from the input and reduces quiescent current to less than 1µA.
ChargePump™
VIN Range: 2.7V to 5.5V
Fully Programmable Current with Single Wire
— 16-Step Logarithmic Scale
— 14/18/27mA Max Current
— Four Low-Current Settings Down to 115µA
— Low IQ (50µA) for Single-Channel, LowCurrent Mode
Tri-Mode 1X, 1.5X, 2X Charge Pump for
Maximum Efficiency and VF Coverage
Drives Up to Four LEDs
Individual Main-Sub (3-1) Group Control
No Inductors, Low Noise Operation
1MHz Constant Switching Frequency
Small Application Circuit
Built-In Thermal Protection
Built-In Auto-Disable for Open Circuit
Automatic Soft Start
IQ <1uA in Shutdown
TDFN33-12 Package
Applications
•
•
•
•
•
The AAT3166 is available in a Pb-free, space saving, 3×3mm TDFN33-12 package and is rated over
the -40°C to +85°C temperature range.
Color (RGB) Lighting
Programmable Current Sink
Transmissive LCD Display
White LED Backlighting
White Photo Flash for Digital Still Cameras
Typical Application
C1+
C2+
C1
1μF
C2
1μF
C2-
C12.7V to 5.5V
IN
OUTCP
D1
AAT3166
CIN
1μF
GND
D2
D3
D4
COUT
1μF
D1
D2
EN/SET
EN/SET
D3
D4
3166.2006.05.1.2
1
AAT3166
High Efficiency 1X/1.5X/2X Charge
Pump for White LED Applications
Pin Descriptions
Pin #
Symbol
Function
1
2
3
4
5
D4
EN/SET
C1+
C1OUTCP
6
7
8
9
10
11
12
EP
C2+
C2IN
GND
D1
D2
D3
Current sink input #4.
AS2Cwire serial interface control pin.
Flying capacitor 1 positive terminal. Connect a 1µF capacitor between C1+ and C1-.
Flying capacitor 1 negative terminal.
Charge pump output to drive load circuit. Requires 1µF capacitor connected between this
pin and ground.
Flying capacitor 2 positive terminal. Connect a 1µF capacitor between C2+ and C2-.
Flying capacitor 2 negative terminal.
Input power supply. Requires 1µF capacitor connected between this pin and ground.
Ground.
Current sink input #1.
Current sink input #2.
Current sink input #3.
Exposed paddle; connect to ground as closely as possible to package.
Pin Configuration
TDFN33-12
(Top View)
D4
EN/SET
C1+
C1OUTCP
C2+
2
1
12
2
11
3
10
4
9
5
8
6
7
D3
D2
D1
GND
IN
C2-
3166.2006.05.1.2
AAT3166
High Efficiency 1X/1.5X/2X Charge
Pump for White LED Applications
Absolute Maximum Ratings1
Symbol
VIN
VEN/SET
IOUT2
TJ
TLEAD
Description
Input Voltage to GND
EN/SET Voltage to GND
Maximum DC Output Current
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads, 10 sec)
Value
Units
-0.3 to 6
-0.3 to VIN + 0.3
150
-40 to 150
300
V
V
mA
°C
°C
Value
Units
2.0
50
W
°C/W
Thermal Information3
Symbol
PD
θJA
Description
Maximum Power Dissipation4
Maximum Thermal Resistance
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions
other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Based on long-term current density limitation.
3. Mounted on an FR4 board.
4. Derate 20mW/°C above 25°C.
3166.2006.05.1.2
3
AAT3166
High Efficiency 1X/1.5X/2X Charge
Pump for White LED Applications
Electrical Characteristics1
CIN = COUT = C1 = C2 = 1.0µF; TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C,
VIN = 3.6V.
Symbol
Description
Conditions
Input Power Supply
VIN
Operation Range
ICC
ISHDN
Operating Current
Min
Typ
2.7
1X Mode, 3.0 ≤ VIN ≤ 5.5, Active,
No Load Current, High Current Mode
1.5X Mode, 3.0 ≤ VIN ≤ 5.5, Active,
No Load Current, High Current Mode
2X Mode, 3.0 ≤ VIN ≤ 5.5, Active,
No Load Current, High Current Mode
1X Mode, 3.0 ≤ VIN ≤ 5.5, Active,
No Load Current, Low Current Mode
VEN/SET = 0V
ISET = 18mA, TA = 25°C
ISET = 400µA, TA = 25°C
VF:D1:D4 = 3.6V
Shutdown Current
High Current Accuracy
IDX
Low Current Accuracy
I(D-Match)
Current Matching2
1X to 1.5X or 1.5X to 2X Transition
VTH
Threshold at Any ISINK Pin
Charge Pump Section
TSS
Soft-Start Time
FCLK
Clock Frequency
EN/SET
VEN(L)
Enable Threshold Low
VIN = 2.7V
VEN(H)
Enable Threshold High
VIN = 5.5V
TEN/SET LO
EN/SET Low Time
TEN/SET_HI_MIN Minimum EN/SET High Time
TEN/SET_HI_MAX Maximum EN/SET High Time
TOFF
EN/SET Off Timeout
TLAT
EN/SET Latch Timeout
IEN/SET
EN/SET Input Leakage
Max Units
5.5
V
0.3
1
mA
1
50
µA
1
10
-10
15
0.5
1
150
mV
100
1000
µs
kHz
0.4
1.4
0.3
75
50
-1
µA
%
%
%
75
500
500
1
V
V
µs
ns
µs
µs
µs
µA
1. The AAT3166 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured
by design, characterization, and correlation with statistical process controls.
2. Current matching is defined as the deviation of any sink current from the average of all active channels.
4
3166.2006.05.1.2
AAT3166
High Efficiency 1X/1.5X/2X Charge
Pump for White LED Applications
Typical Characteristics
Unless otherwise noted, VIN = 3.5V, CIN = COUT = C1 = C2 = 1µF, TA = 25°C.
Efficiency vs. Supply Voltage
Turn-On to 1X Mode
(VIN = 4.2V; 18mA Load)
100
18mA
VF = 3.4V
90
Efficiency (%)
80
EN
(2V/div)
70
60
VOUT
(2V/div)
VSINK
(500mV/div)
50
40
5.1mA
VF = 3.0V
30
20
10
350μA
VF = 2.7V
IIN
(200mA/div)
0
2.5
2.8
3.0
3.3
3.5
3.8
4.0
4.3
4.5
4.8
5.0
5.3
5.5
μs/div
100μ
Supply Voltage (V)
Turn-On to 1.5X Mode
Turn-On to 2X Mode
(VIN = 3.5V; 18mA Load)
(VIN = 2.8V; 18mA Load)
EN
(2V/div)
EN
(2V/div)
VOUT
(2V/div)
VSINK
(500mV/div)
VOUT
(2V/div)
VSINK
(500mV/div)
IIN
(200mA/div)
IIN
(200mA/div)
μs/div
100μ
μs/div
100μ
Turn-Off from 1.5X Mode
Current Matching vs. Temperature
(VIN = 3.5V; 18mA Load)
19.0
18.8
EN
(2V/div)
Current (mA)
18.6
VF
(1V/div)
IIN
(100mA/div)
18.4
Channel 2
18.2
18.0
17.8
17.6
Channel 1
17.4
Channel 3
Channel 4
17.2
17.0
-40
μs/div
100μ
3166.2006.05.1.2
-20
0
20
40
60
80
Temperature (°°C)
5
AAT3166
High Efficiency 1X/1.5X/2X Charge
Pump for White LED Applications
Typical Characteristics
Unless otherwise noted, VIN = 3.5V, CIN = COUT = C1 = C2 = 1µF, TA = 25°C.
Load Characteristics
Load Characteristics
(VIN = 3.8V; 1.5X Mode; 18mA Load)
(VIN = 2.8V; 2X Mode; 18mA Load)
VIN
(40mV/div)
VIN
(40mV/div)
VOUT
(40mV/div)
VOUT
(40mV/div)
VSINK
(40mV/div)
VSINK
(40mV/div)
500ns/div
500ns/div
Load Characteristics
Load Characteristics
(VIN = 4.1V; 1.5X Mode; 27mA Load)
(VIN = 3.2V; 2X Mode; 27mA Load)
VIN
(40mV/div)
VIN
(40mV/div)
VOUT
(40mV/div)
VOUT
(40mV/div)
VSINK
(40mV/div)
VSINK
(40mV/div)
500ns/div
500ns/div
Input Ripple vs. Input Voltage
Input Ripple (mV)
12
27mA
10
18mA
8
6
4
14mA
2
0
2.5
2.7
2.9
3.1
3.3
3.5
3.7
3.9
4.1
4.3
4.5
Input Voltage (V)
6
3166.2006.05.1.2
AAT3166
High Efficiency 1X/1.5X/2X Charge
Pump for White LED Applications
Typical Characteristics
Unless otherwise noted, VIN = 3.5V, CIN = COUT = C1 = C2 = 1µF, TA = 25°C.
EN/SET Off Timeout vs. Input Voltage
400
300
250
-40°C
200
150
25°C
100
85°C
50
EN/SET Off Timeout (μ
μs)
350
0
-40°C
250
200
150
25°C
100
85°C
50
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5
Input Voltage (V)
Input Voltage (V)
Enable Threshold High vs. Input Voltage
Enable Threshold Low vs. Input Voltage
1.1
0.9
300
0
1.2
1
350
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5
-40°C
0.8
0.7
25°C
0.6
85°C
0.5
0.4
0.3
0.2
Enable Threshold Low (V)
Enable Threshold High (V)
EN/SET Latch Timeout (μ
μs)
EN/SET Latch Timeout vs. Input Voltage
1.2
1.1
1
0.9
-40°C
0.8
0.7
0.6
0.5
25°C
85°C
0.4
0.3
0.2
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5
Input Voltage (V)
Input Voltage (V)
3166.2006.05.1.2
7
AAT3166
High Efficiency 1X/1.5X/2X Charge
Pump for White LED Applications
Functional Block Diagram
C1+
C1- C2+
C2-
1X, 1.5X, 2X
Charge Pump
IN
OUTCP
Soft-Start
Control
1MHz
Oscillator
Voltage
Reference
6 x 16 Bit
ROM
EN/SET
AS2Cwire
Interface
6 x 16 Bit
ROM
D/A
D1
D/A
D2
D/A
D3
D/A
D4
GND
Functional Description
The AAT3166 is a tri-mode load switch (1X) and
high efficiency (1.5X or 2X) charge pump device
intended for white LED backlight applications. To
maximize power conversion efficiency, an internal
sensing circuit monitors the voltage required on
each constant current sink input and sets the load
switch and charge pump modes based on the input
battery voltage and the current sink input voltage.
As the battery discharges over time, the AAT3166
charge pump is enabled when any of the four current sink inputs near dropout. The charge pump
initially starts in 1.5X mode. If the charge pump
output drops enough for any current source output
to become close to dropout, the charge pump will
automatically transition to 2X mode. The AAT3166
requires only four external components: two 1µF
ceramic capacitors for the charge pump flying
8
capacitors (C1 and C2), one 1µF ceramic input
capacitor (CIN), and one 0.33µF to 1µF ceramic
charge pump output capacitor (COUT).
The four constant current sink inputs (D1 to D4)
can drive four individual LEDs with a maximum current of 27mA nominal each. Unused sink inputs
should be connected to OUTCP, otherwise the part
will operate only in 2X charge pump mode. The
AS2Cwire serial interface enables the AAT3166
and sets the current sink magnitudes. AS2Cwire
addressing allows independent control of two
groups of current sink input: D1~D3 and D4.
Constant Current Output Level Settings
The constant current sink levels for D1 to D4 are
set via the serial interface according to a logarithmic scale where each code is approximately 1.8dB
lower than the previous code. In this manner, LED
3166.2006.05.1.2
AAT3166
High Efficiency 1X/1.5X/2X Charge
Pump for White LED Applications
brightness appears linear with each increasing
code count. Because the inputs D1 to D4 are true
independent constant current sinks, the voltage
observed on any single given input will be determined by the actual forward voltage (VF) for the
LED being driven.
Since the input current sinks of the AAT3166 are
programmable, no PWM (pulse width modulation) or
additional control circuitry is needed to control LED
brightness. This feature greatly reduces the burden
on a microcontroller or system IC to manage LED or
display brightness, allowing the user to "set it and
forget it." With its high-speed serial interface (1MHz
data rate), the input sink current of the AAT3166 can
be changed successively to brighten or dim LEDs in
smooth transitions (e.g., to fade-out) or in abrupt
steps, giving the user complete programmability and
real-time control of LED brightness.
The 16 individual current level settings are each
approximately 1.8dB apart (see Table 1). Code 1 is
full scale; Code 15 is full scale attenuated by
approximately 25dB; and Code 16 is reserved as a
"no current" setting.
Data
27mA Max
IOUT (mA)
18mA Max
IOUT (mA)
14mA Max
IOUT (mA)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
27
22
18
14
12
10
8
6.2
5.2
4.3
3.3
2.9
2.4
1.9
1.4
0
18
15
12
10
7.9
6.3
5.1
4.1
3.5
2.9
2.2
1.9
1.6
1.3
1.0
0
14
11
8.8
7.1
6.0
4.8
3.8
3.1
2.6
2.1
1.7
1.4
1.2
1.0
0.7
0
Table 1: Current Level Settings.
3166.2006.05.1.2
AS2Cwire Serial Interface
The current sink input magnitude of the AAT3166 is
controlled by AnalogicTech's Advanced Simple
Serial Control (AS2Cwire) serial digital input.
AS2Cwire adds addressing capability for multiple
data registers over the Simple Serial Control™
(S2Cwire™), which is capable of controlling only a
single register. The AAT3166 has four registers:
Bank1, Bank2, Max Current, and Low Current.
Three addresses are used to control the two registers. Address 0 addresses both registers simultaneously to allow the loading of both registers with the
same data using a single write protocol. Address 1
addresses Register 1 for D1 to D3 current level settings. Address 2 addresses Register 2 for D4 current level settings.
AS2Cwire relies on the number of rising edges of
the EN/SET pin to address and load the registers.
AS2Cwire latches data or address after the EN/SET
pin has been held high for time TLAT. Address or
data is differentiated by the number of EN/SET rising edges. Since the data registers are 4 bits each,
the differentiating number of pulses is 24 or 16, so
that Address 0 is signified by 17 rising edges,
Address 1 by 18 rising edges, and Address 2 by 19
rising edges. Data is set to any number of rising
edges between 1 and including 16. A typical write
protocol is a burst of EN/SET rising edges signifying a particular address, followed by a pause with
EN/SET held high for the TLAT timeout period, a
burst of rising edges signifying data, and a TLAT
timeout for the data registers. Once an address is
set, then multiple writes consisting of data only
(without address) to the corresponding data register are allowed. Address 0 is the default address
on the first rising edge after the AAT3166 has been
disabled. If data is presented on the first rising
edge with no prior address, both data registers are
simultaneously loaded.
The maximum current level is determined by the
value set in Register 3, the Max Current register.
Three scales are available for high operating currents with maximum current levels of 27mA, 18mA,
or 14mA. Each scale maintains approximately
1.8dB steps between settings. A separate mode is
9
AAT3166
High Efficiency 1X/1.5X/2X Charge
Pump for White LED Applications
available for ultra-low LED current operation.
When the Max Current register (Register 3) is set
to the Low Current setting, the Low Current register (Register 4) must be programmed. The two
most significant bits of the Low Current register
control whether or not a given bank of current sinks
is enabled. The least two significant bits of the Low
Current register set the current level for both
banks. For low current settings, the charge pump
may be enabled if required by the battery voltage
and LED forward voltage conditions, and 1X mode
quiescent current is approximately 100µA for multiple channels or 50µA for Channel 4 operation only.
Both banks of current sinks must be in the same
high or low current mode of operation.
When EN/SET is held low for an amount of time
greater than TOFF, the AAT3166 enters shutdown
mode and draws less than 1µA from VIN. Data and
Address registers are reset to 0 during shutdown.
AS2Cwire Serial Interface Addressing
Address
EN/SET
Rising Edges
Data Register
AAT3166
0
1
2
3
4
17
18
19
20
21
1&2: D1~D4 Current
1: D1~D3 Current
2: D4 Current
3: Max Current
4: Low Current
10
Data
Max Current
1
2
3
4
18mA
27mA
14mA
Low Current
(see Low Current Register for values)
Low Current Register (Address 4)
Data
Main Low
Current On
Sub Low
Current On
Current
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Yes
Yes
Yes
Yes
No
No
No
No
Yes
Yes
Yes
Yes
115µA
175µA
280µA
400µA
115µA
175µA
280µA
400µA
115µA
175µA
280µA
400µA
Auto-Disable Feature
The AAT3166 is equipped with an auto-disable feature for each LED channel. After the IC is enabled
and started up, a test current of 120µA (typical) is
forced through each sink channel. The channel will
be disabled if the voltage of that particular SINK pin
does not drop to a certain threshold. This feature is
very convenient for disabling an unused channel or
during an LED fail-short event.
Thermal Protection
The AAT3166 has a built-in thermal protection circuit that will shut down the charge pump if the die
temperature rises above the thermal limit, as would
be the case during a short circuit of the OUTCP pin.
3166.2006.05.1.2
AAT3166
High Efficiency 1X/1.5X/2X Charge
Pump for White LED Applications
AS2Cwire Serial Interface Timing
Address
Data
THI
TLO
TLAT
TLAT
EN/SET
1
2
Address
17
18
0
0
Data Reg 2
0
LED Selection
Although the AAT3166 is designed for driving white
LEDs, the device also can be used to drive most
types of LEDs with forward voltage specifications
ranging from 2.0V to 4.7V. LED applications may
include main and sub-LCD display backlighting,
camera photo-flash applications, color (RGB)
LEDs, infrared (IR) diodes for remotes, and other
loads benefiting from a controlled output current
generated from a varying input voltage. Since the
D1 to D4 input current sinks are matched with negligible voltage dependence, the LED brightness will
be matched regardless of the specific LED forward
voltage (VF) levels.
In some instances (e.g., in high-luminous-output
applications such as photo flash), it may be necessary to drive high-VF type LEDs. The low-dropout
current sinks in the AAT3166 make it capable of
driving LEDs with forward voltages as high as 4.7V
at full current from an input supply as low as 3.0V.
Outputs can be paralleled to drive high-current
LEDs without complication.
2...
n <= 16
1
Data Reg 1
Applications Information
3166.2006.05.1.2
1
n-1
Device Switching Noise Performance
The AAT3166 operates at a fixed frequency of
approximately 1MHz to control noise and limit harmonics that can interfere with the RF operation of
cellular telephone handsets or other communication devices. Back-injected noise appearing on the
input pin of the charge pump is 20mV peak-topeak, typically ten times less than inductor-based
DC/DC boost converter white LED backlight solutions. The AAT3166 soft-start feature prevents
noise transient effects associated with inrush currents during start-up of the charge pump circuit.
Capacitor Selection
Careful selection of the four external capacitors
(CIN, C1, C2, COUT) is important because they will
affect turn-on time, output ripple, and transient performance. Optimum performance will be obtained
when low equivalent series resistance (ESR)
ceramic capacitors are used; in general, low ESR
may be defined as less than 100mΩ. A value of
1µF for all four capacitors is a good starting point
when choosing capacitors. If the LED current
sources are programmed only for light current levels, then the capacitor size may be decreased.
11
AAT3166
High Efficiency 1X/1.5X/2X Charge
Pump for White LED Applications
Capacitor Characteristics
Ceramic Capacitor Materials
Ceramic composition capacitors are highly recommended over all other types of capacitors for use
with the AAT3166. Ceramic capacitors offer many
advantages over their tantalum and aluminum electrolytic counterparts. A ceramic capacitor typically
has very low ESR, is lowest cost, has a smaller
PCB footprint, and is non-polarized. Low ESR
ceramic capacitors help maximize charge pump
transient response. Since ceramic capacitors are
non-polarized, they are not prone to incorrect connection damage.
Ceramic capacitors less than 0.1µF are typically
made from NPO or C0G materials. NPO and C0G
materials generally have tight tolerance and are
very stable over temperature. Larger capacitor values are usually composed of X7R, X5R, Z5U, or
Y5V dielectric materials. Large ceramic capacitors
(i.e., greater than 2.2µF) are often available in lowcost Y5V and Z5U dielectrics, but capacitors
greater than 1µF are not typically required for
AAT3166 applications.
Equivalent Series Resistance
ESR is an important characteristic to consider when
selecting a capacitor. ESR is resistance internal to
a capacitor that is caused by the leads, internal connections, size or area, material composition, and
ambient temperature. Capacitor ESR is typically
measured in milliohms for ceramic capacitors and
can range to more than several ohms for tantalum
or aluminum electrolytic capacitors.
12
Capacitor area is another contributor to ESR.
Capacitors that are physically large will have a lower
ESR when compared to an equivalent material
smaller capacitor. These larger devices can improve
circuit transient response when compared to an
equal value capacitor in a smaller package size.
3166.2006.05.1.2
AAT3166
High Efficiency 1X/1.5X/2X Charge
Pump for White LED Applications
Ordering Information
Package
Marking1
Part Number (Tape and Reel)2
TDFN33-12
PXXYY
AAT3166IWP-T1
All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means
semiconductor products that are in compliance with current RoHS standards, including
the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more
information, please visit our website at http://www.analogictech.com/pbfree.
Package Information
TDFN33-12
2.40 ± 0.05
Detail "B"
3.00 ± 0.05
Index Area
(D/2 x E/2)
0.3 ± 0.10 0.16 0.375 ± 0.125
0.075 ± 0.075
3.00 ± 0.05
1.70 ± 0.05
Top View
Bottom View
Pin 1 Indicator
(optional)
0.23 ± 0.05
Detail "A"
0.45 ± 0.05
0.1 REF
0.05 ± 0.05
Side View
0.229 ± 0.051
+ 0.05
0.8 -0.20
7.5° ± 7.5°
Option A:
C0.30 (4x) max
Chamfered corner
Option B:
R0.30 (4x) max
Round corner
Detail "B"
Detail "A"
All dimensions in millimeters.
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
3166.2006.05.1.2
13
AAT3166
High Efficiency 1X/1.5X/2X Charge
Pump for White LED Applications
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14
3166.2006.05.1.2