AAT3351 Datasheet PDF - Anadigics
| Part Number | AAT3351 | |
| Description | High Efficiency 1x/1.5x Charge Pump | |
| Manufacturers | Anadigics | |
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ChargePumpTM
General Description
The AAT3351 is a low-noise, constant-frequency charge
pump DC/DC converter that uses a dual-mode load
switch (1x) and fractional (1.5x) charge pump to maxi-
mize efficiency for white LED applications. AAT3351 is
capable of driving 4 white LEDs at a total of 120mA from
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 AAT3351 ideal for small battery-powered
applications.
Analogic Tech’s S2Cwire™ serial digital input is used to
enable, disable, and set current to one of 32 levels for
the LEDs.
The AAT3351 is equipped with built-in short-circuit pro-
tection. The soft-start circuitry prevents excessive inrush
current at start-up and mode transitions. The AAT3351
family is available in Pb-free, space-saving TSOPJW and
TDFN33 packages, and operates over the -40°C to
+85°C ambient temperature range.
PRODUCT DATASHEET
AAT3351
High Efficiency 1x/1.5x Charge Pump
Features
• Drives up to 4 LEDs at up to 30mA, each
• Automatic Switching Between 1x and 1.5x Modes
• 1MHz Switching Frequency
• Linear LED Output Current Control
▪ Single-wire, S2Cwire Interface
▪ 32-step
• ±10% LED Output Current Accuracy
• 3% LED Output Current Matching
• Low-Current Shutdown Mode
• Automatic Soft-Start
• 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
C IN
1µF
EN/SET
S2Cwire Serial Control
C1+ C2+
C1- C2-
IN OUT
AAT3351
EN/SET
D1
D2
D3
D4
GND
C2
1µF
D1 D2 D3 D4
C OUT
1µF
3351.2009.02.1.0
www.analogictech.com
1
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www.DataSheet4U.com
ChargePumpTM
PRODUCT DATASHEET
AAT3351
High Efficiency 1x/1.5x Charge Pump
Typical Characteristics
VIN = 3.6V, CIN = COUT = C1 = C2 = 1μF; TA = 25°C, unless otherwise noted.
No Load Operating Current vs. Input Voltage
(1x Mode)
2.5
2.45
2.4
2.35
2.3
2.25
2.2 85°C
2.15 25°C
2.1 0°C
-40°C
2.05
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
No Load Operating Current vs. Input Voltage
(1.5x Mode)
8
7
6
5
4
3
85°C
2 25°C
1 0°C
-40°C
0
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
Backlight Current Matching vs. Temperature
(30mA/ch)
0.60
0.50
0.40
0.30
0.20
0.10
0.00
-40
-15 10 35 60
Temperature (°C)
85
Efficiency vs. Input Voltage
(DATA = 1, 30mA/ch)
100
VF = 3.3V
VF = 3.0V
85 VF = 2.7V
70
55
40
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
Input Voltage (V)
1.5x Output Voltage vs. Load Current
5.5
5
4.5
4
3.5 VIN = 3.3V
VIN = 3.6V
VIN = 4.2V
3
0 50 100 150 200
Load Current (mA)
1.5x Mode Operating Characteristics
(VIN = 3.3V; 30mA/ch Backlight, 1.5x Mode, COUT = 1µF)
VOUT
(AC coupled) 0
(50mV/div)
C1+
(2V/div)
C2+
(2V/div)
0
0
VIN
(AC coupled) 0
(20mV/div)
Time (1µs/div)
3351.2009.02.1.0
www.analogictech.com
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for AAT3351 electronic component. |
| Information | Total 15 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ AAT3351.PDF Datasheet ] | |
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