AAT3194 Datasheet PDF - AAT
| Part Number | AAT3194 | |
| Description | High Efficiency 1.5X Fractional Charge Pump | |
| Manufacturers | AAT | |
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AAT3194
High Efficiency 1.5X Fractional Charge
Pump For White LED Applications
General Description
Features
ChargePump™
The AAT3194 is a 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. A low external parts
count (two 1µF flying capacitors and two small
bypass capacitors at IN and OUT) makes these
devices ideally suited for small, battery-powered
applications.
AnalogicTech’s Simple Serial Control™ (S2Cwire™)
interface is used to enable, disable, and set the
LED drive current for 32-level logarithmic scale LED
brightness control. The AAT3194 has a thermal
management system for protection 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. A 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 AAT3194 is available in a Pb-free 12-pin
TSOPJW package.
• VIN Range: 2.7V to 5.5V
• 20mA Full-Scale Current
• Simple Serial Control (S2Cwire) Interface
— 32-Position Logarithmic Scale with Digital
Control
• 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
• No Inductors
• 600kHz Switching Frequency
• IQ <1µA in Shutdown
• Temperature Range: -40°C to 85°C
• 12-Pin TSOPJW Package
Applications
• Programmable Current Source
• White LED Backlighting
Typical Application
VBATTERY
CIN COUT
1µF 1µF
EN/SET
IN C1+
OUT
C1-
C2+
AAT3194
C2-
EN/SET
D1
D2
D3
D4
GND
C1
1µF
C2
1µF
D4 D3 D2 D1
3194.2006.09.1.0
1
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AAT3194
High Efficiency 1.5X Fractional Charge
Pump For White LED Applications
Typical Characteristics
VIN = 3.5V, CIN = COUT = C1 = C2 = 1µF; TA = 25°C, unless otherwise noted.
Quiescent Current vs. Temperature
1.00
0.98
0.96
0.94
0.92
0.90
0.88
0.86
-40 -20 0 20 40 60 80 100
Temperature (°C)
Efficiency vs. Supply Voltage
100
30mA
95
90
85
40mA
80
75
70
65
60
3.0
3.2
20mA
60mA
80mA
3.4 3.6 3.8 4.0
Supply Voltage (V)
4.2
4.4
Quiescent Current vs. Supply Voltage
1.2
1.1
1.0
0.9
0.8
0.7
0.6
3.0
3.5 4.0
4.5 5.0
Supply Voltage (V)
5.5
Efficiency vs. Load Current
96
94
92
90
88
86
84
82
80
0
20 40 60
Load Current (mA)
80
Shutdown Current vs. Temperature
1.000
0.100
0.010
0.001
-40
-20
0 20 40 60
Temperature (°C)
80 100
3194.2006.09.1.0
Oscillator Frequency vs. Temperature
710
700
690
680
670
660
650
640
630
620
610
-40 -20 0 20 40 60 80 100
Temperature (°C)
5
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for AAT3194 electronic component. |
| Information | Total 14 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ AAT3194.PDF Datasheet ] | |
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