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PDF AAT3175 Data sheet ( Hoja de datos )
| Número de pieza | AAT3175 | |
| Descripción | High Current LED Flash Driver Charge Pump IC | |
| Fabricantes | ANALOGICTECH | |
| Logotipo |  |
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AAT3175
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Flash Applications
General Description
The AAT3175 is a low noise, constant frequency
charge pump DC/DC converter that uses a tri-mode
load switch (1X), fractional (1.5X), and doubling
(2X) conversion to maximize efficiency for white
LED flash applications. The AAT3175 is capable of
driving up to three flash LEDs at 300mA total cur-
rent from a 2.7V to 5.5V input. A low external parts
count (two 1µF flying capacitors and two small 1µF
capacitors at VIN and VOUT) make this part ideally
suited for small battery-powered applications.
AnalogicTech's S2Cwire™ (Simple Serial Control™)
serial digital input is used to enable, disable, and
set current for all LEDs with 16 level settings down
to 0.
The AAT3175 is equipped with built-in protection
for VOUT short-circuit condition and auto-disable for
load short-circuit condition on any one of the chan-
nels. Built-in soft-start circuitry prevents excessive
inrush current during start-up. A low-current shut-
down feature disconnects the load from VIN and
reduces quiescent current to less than 1µA.
The AAT3175 is available in a Pb-free, space-saving,
thermally-enhanced 12-pin 3x3mm TDFN package.
Features
ChargePump™
• VIN Range: 2.7V to 5.5V
• Up to 300mA Total Flash Current
• Fully Programmable Current with Single Wire
— 16 Logarithmic Current Levels
• Tri-Mode 1X, 1.5X, and 2X Charge Pump for
Maximum Efficiency and VF Coverage
• Drives 3-in-1 or 2-in-1 Flash LEDs
— 0.5% Current Matching
• No Inductors, Low Noise Operation
• 1MHz Constant Switching Frequency
• Small Application Circuit
• Built-In Thermal Protection
• Automatic Soft-Start
• IQ <1µA in Shutdown
• TDFN33-12 Package
Applications
• Programmable Current Sinks
• White LED Backlighting
• White Photo Flash for Mobile Phones
Typical Application
C1
1µF
2.7V to 5.5V
CIN
1µF
EN/SET
C1+ C2+
C1- C2-
VIN VOUT
AAT3175
GND
EN/SET
D1
D2
D3
D4
D1 D2 D3
COUT
1µF
3175.2006.01.1.2
1
1 page  
AAT3175
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Flash Applications
Typical Characteristics
CIN = COUT = C1 = C2 = 1µF, TA = 25°C, VIN = 3.5V, unless otherwise noted.
Efficiency vs. Supply Voltage
100
90 60mA
80 VF = 3.0V
70
60 150mA
VF = 3.2V
50
40
30
2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2
Supply Voltage (V)
VOUT
(2V/div)
IOUT
(200mA/div)
300mA LED Pulse
(VIN = 3.8V)
Time (100ms/div)
EN
(2V/div)
VOUT
(2V/div)
VSINK
(1V/div)
IIN
(400mA/div)
Turn-On to 1X Mode
(VIN = 4.2V; 300mA Load)
Time (200µs/div)
EN
(2V/div)
VOUT
(2V/div)
VSINK
(1V/div)
IIN
(400mA/div)
Turn-On to 1.5X Mode
(VIN = 4.0V; 300mA Load)
Time (200µs/div)
EN
(2V/div)
VOUT
(2V/div)
VSINK
(1V/div)
IIN
(400mA/div)
Turn-On to 2X Mode
(VIN = 3.8V; 300mA Load)
Time (200µs/div)
EN
(2V/div)
VF
(1V/div)
IIN
(200mA/div)
Turn-Off from 1.5X Mode
(VIN = 4.0V; 300mA Load)
Time (200µs/div)
3175.2006.01.1.2
5
5 Page 
AAT3175
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Flash Applications
Ordering Information
Package
TDFN33-12
Marking1
QAXYY
Part Number (Tape and Reel)2
AAT3175IWP-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
Index Area
(D/2 x E/2)
TDFN33-12
Detail "B"
Detail "A"
3.00 ± 0.05
Top View
7.5° ± 7.5°
0.05 ± 0.05
Side View
All dimensions in millimeters.
1.70 ± 0.05
Bottom View
0.3 ± 0.10 0.16 0.375 ± 0.125
0.075 ± 0.075
0.1 REF
Pin 1 Indicator
(optional)
Option A:
C0.30 (4x) max
Chamfered corner
Option B:
R0.30 (4x) max
Round corner
Detail "A"
Detail "B"
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
3175.2006.01.1.2
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AAT3175.PDF ] | |
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