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AAT3340 Schematic ( PDF Datasheet ) - Advanced Analogic Technologies

Teilenummer AAT3340
Beschreibung High Efficiency 1x/1.5x Charge Pump
Hersteller Advanced Analogic Technologies
Logo Advanced Analogic Technologies Logo 




Gesamt 14 Seiten
AAT3340 Datasheet, Funktion
www.DataSheet4U.com
ChargePumpTM
General Description
The AAT3340 is a low-noise, constant-frequency charge
pump DC/DC converter that uses a dual-mode load switch
(1x) and fractional (1.5x) conversion to maximize effi-
ciency for white LED applications. The AAT3340 is capable
of driving 4 white LEDs at a total of 80mA from a single
2.7V to 5.5V input. The current sinks may be operated
individually or in parallel while driving higher-current
LEDs. A low external parts count (two 1μF flying capacitors
and two small 1μF capacitors at VIN and VOUT) makes the
AAT3340 ideal for small battery-powered applications.
Analogic Tech’s Simple Serial Control (S2Cwire) digital
interface is used to enable, disable and set current to
one of 32 levels for the LEDs.
The AAT3340 is equipped with built-in short-circuit and
over-temperature protection. The soft-start circuitry pre-
vents excessive inrush current at start-up and mode
transitions. The AAT3340 family is available in Pb-free,
space-saving TSOPJW and TDFN33 packages, and oper-
ates over the -40°C to +85°C ambient temperature
range.
PRODUCT DATASHEET
AAT3340
High Efficiency 1x/1.5x Charge Pump
Features
• Dual-Mode (1x/1.5x) Charge Pump
• Drives up to 4-Channel Backlight LEDs
• 32-Level Programmable Backlight Current (linear,
inverting)
Single-wire S2Cwire Control
• Built-in Thermal Protection
• Automatic Soft Start
• -40°C to +85°C Temperature Range
• TSOPJW-12 and TDFN33-12 Packages
Applications
• Cellular and Smart Phones
• Digital Still and Video Cameras
• PDAs
• Portable Devices
• Portable Media Players
• Other White LED Backlighting
Typical Application
C1
1μF
VBATTERY
3.6V
CIN
1μF
EN/SET
S2Cwire Serial Control
C1+ C2+
C1- C2-
IN OUT
AAT3340
EN/SET
BL1
BL2
BL3
BL4
GND
C2
1μF
D1 D2 D3 D4
COUT
1μF
3340.2008.07.1.1
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1






AAT3340 Datasheet, Funktion
www.DataSheet4U.com
ChargePumpTM
PRODUCT DATASHEET
AAT3340
High Efficiency 1x/1.5x Charge Pump
Typical Characteristics
VIN = 3.6V, CIN = COUT = C1 = C2 = 1μF; TA = 25°C, unless otherwise noted.
EN/SET Input Latch Timeout vs. Input Voltage
EN/SET Input OFF Timeout vs. Input Voltage
350
300
250
200
150 85°C
25°C
-40°C
100
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
400
350
300
250
200
85°C
150 25°C
-40°C
100
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
Output Current Matching Over Temperature
21.5
21.0
20.5
20.0
19.5 BL4
BL3
19.0 BL2
BL1
18.5
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
Temperature (°C)
EN Input High Threshold Voltage
vs. Input Voltage
1.2
1.0
0.8
0.6
0.4 -40°C
25°C
85°C
0.2
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
EN Input Low Threshold Voltage
vs. Input Voltage
1.2
1.0
0.8
0.6
0.4 -40°C
25°C
85°C
0.2
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
1x Mode Turn-On Waveform
(VIN = 3.6V; Load = 80mA)
EN
(2V/div) 0
VOUT
(4V/div) 0
VBL 0
(4V/div)
IIN
(200mA/div)
0
Time (100µs/div)
6
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AAT3340 pdf, datenblatt
www.DataSheet4U.com
ChargePumpTM
PRODUCT DATASHEET
AAT3340
High Efficiency 1x/1.5x Charge Pump
AAT3340 Evaluation Board Schematic
DC+
DC+
DC-
J1
C8 1 2 3
10µF
C2
1µF
C2+ C2-
C1
1µF
C1+ C1-
COUT
1µF
CPO
U1 AAT3340
D4 D3 D2 D1
1 C1P
C2N 12
JP1
VIN
CIN
1µF
2 CPO
3 VIN
4 C2P
5 EN/SET
6 BL1
GND 11
C1N
BL4
10
9 BL4
BL3 8 BL3
BL2
7
BL2
R9 0
R10 0
R11 0
R12
0
EXP PAD
BL1
C6
4.7µF
EN/SET
+3.3V
JP5
S2C
R2
20K
GND
S1
UP
S2
DOWN
S3
CYCLE
R5 R4 R3
1K 1K 1K
S1
S2
S3
U2 PIC12F675
1
2
3
4
VDD
GP5
GP4
GP3
VSS
GP0
GP1
GP2
8
7
6
5
VR1
POT10K
C4 R7
0.1µF 330
LED2
Red
R6
330
LED1
Green
Figure 3: AAT3340 Evaluation Board Rev.1A Schematic.
Figure 4: AAT3340 Evaluation Board Rev.1A
PCB Component Side Layout.
Figure 5: AAT3340 Evaluation Board Rev.1A
Solder Side Layout.
12
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3340.2008.07.1.1

12 Page





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