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AAT3114ISN-20-T1 Schematic ( PDF Datasheet ) - Advanced Analogic Technologies

Teilenummer AAT3114ISN-20-T1
Beschreibung High Efficiency 1.5X Fractional Charge Pumps For White LED Applications
Hersteller Advanced Analogic Technologies
Logo Advanced Analogic Technologies Logo 




Gesamt 14 Seiten
AAT3114ISN-20-T1 Datasheet, Funktion
AAT3113/4
High Efficiency 1.5X Fractional Charge
Pumps For White LED Applications
General Description
The AAT3113/4 are low noise, constant frequency
charge pump DC/DC converters that use fractional
(1.5X) conversion to increase efficiency in White
LED applications. The devices can be used to pro-
duce current levels up to 20mA for each output from
a 2.7V to 5.5V input. Low external parts counts (two
1µF flying capacitors and two small bypass capaci-
tors at VIN, and OUT) make the AAT3113/4 ideally
suited for small battery-power applications.
AnalogicTech™’s Simple Serial Control™
(S2Cwire™) interface is used to enable, disable
and set the LED drive current for a 32 level loga-
rithmic scale LED brightness control. The
AAT3113/4 have a thermal management system to
protect the device in the event of a short circuit
condition on any of the output pins. Built-in soft-
start circuitry prevents excessive inrush current
during start-up. High switching frequency enables
the use of small external capacitors. A low current
shutdown feature disconnects the load from VIN
and reduces quiescent current to less than 1µA.
The AAT3113 provides 4 LED current source out-
puts, and the AAT3114 provides 6. The AAT3113/4
are available in 16-pin quad QFN packages, and
the AAT3113 is also available in the 12-pin
TSOPJW package.
Features
ChargePump
• White LED Backlighting
• AAT3113 - 4 Outputs
• AAT3114 - 6 Outputs
• 20mA Full Scale Current
• 32 Position Logarithmic Scale with Digital
Control
• Simple Serial Control™ (S2Cwire™) interface
• Low Noise Constant Frequency Operation
• 33% Less Input Current Than Doubler
Charge Pump
• High Accuracy Brightness Matching
• Small Application Circuit
• Regulated Output Current
• Automatic Soft-Start
• VIN Range: 2.7V to 5.5V
• No Inductors
• 600kHz Switching Frequency
• Iq < 1µA in Shutdown
• Temperature Range -40 to 85°C.
• 16-Pin QFN, 12-Pin TSOPJW Package
Applications
• White LED Backlighting
• Programmable Current Source
Typical Application
VBATTERY
CIN COUT
1µF 1µF
EN/SET
VIN C1+
VOUT
C1-
C2+
AAT3114
C2-
EN/SET
GND
D1
D2
D3
D4
D5
D6
C1
1µF
C2
1µF
D6 D5 D4 D3 D2 D1
3113.2004.07.1.4
1






AAT3114ISN-20-T1 Datasheet, Funktion
AAT3113/4
High Efficiency 1.5X Fractional Charge
Pumps For White LED Applications
Typical Characteristics
(unless otherwise noted: VIN=3.5V, CIN=COUT=C1=C2=1µF, TA=25°C)
Turn-On
ENSET
(2V/div)
OUT
(5V/div)
VDIODE
(2V/div)
IIN
(50mA/div)
100µs/div
ENSET
(2V/div)
OUT
(5V/div)
VDIODE
(5V/div)
IIN
(50mA/div)
Turn-Off
200µs/div
IN
OUT
VDIODE
40mA Load Characteristics
1µs/div
IN
OUT
VDIODE
80mA Load Characteristics
1µs/div
60mA Load Characteristics
IN
OUT
VDIODE
1µs/div
IN
OUT
VDIODE
120mA Load Characteristics
1µs/div
6 3113.2004.07.1.4

6 Page









AAT3114ISN-20-T1 pdf, datenblatt
AAT3113/4
High Efficiency 1.5X Fractional Charge
Pumps For White LED Applications
Driving White LED display module back lights
and individual white LED's connected in parallel:
The AAT3113/14 D1 to D6 outputs are true constant
current sources capable of driving up to 20mA each
over the operation input voltage range. Since these
outputs are true constant current sources, they may
be connected in parallel to drive a single power out-
put. Any combination of outputs (D1 to D6) may be
connected in parallel. The maximum total output
current is a sum of how many current sources are
parallel connected. This feature is particularly use-
ful to power pre-manufactured display modules
which are pre-wired with white LED backlights con-
nected in a parallel circuit configuration. All output
may be connected in parallel to drive groups of
LED's as well. The internal current source refer-
ence circuit bases feedback from current sensed on
the D1 output. For best operation, the only require-
ment for this application is the output D1 should
always be connected to the load circuit.
AAT3114 application driving a display module with six parallel connected white LEDs:
VBATTERY
VIN C1+
CIN COUT
1µF 1µF
EN/SET
VOUT
C1-
C2+
AAT3114
C2-
EN/SET
GND
D1
D2
D3
D4
D5
D6
C1
1µF
C2
1µF
Display Module
D1 D2 D3 D4 D5 D6
R RR R RR
Resistor R is optional
AAT3114 Dual Backlight Control Circuit:
VIN C1+
VBATTERY
CIN COUT
1µF 1µF
EN/SET
VOUT
C1-
C2+
AAT3114
C2-
EN/SET
GND
D1
D2
D3
D4
D5
D6
C1
1µF
C2
1µF
Display Backlight
D1 D2 D3
Keyboard Backlight
D4 D5 D6
Enable Keyboard Backlight
Enable Display Backlight
12 3113.2004.07.1.4

12 Page





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