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PDF AAT3120 Data sheet ( Hoja de datos )
| Número de pieza | AAT3120 | |
| Descripción | 3-Channel Charge Pump | |
| Fabricantes | AAT | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AAT3120 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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AAT3120
3-Channel Charge Pump
For White LED Applications
General Description
Features
ChargePump™
The AAT3120 is a low noise, constant frequency
charge pump DC/DC converter that uses fractional
(1.5X) conversion to improve efficiency for white
LED applications. The device can be used to pro-
duce eight current levels up to 20mA per channel
for up to three channels. 1X load switch mode is
also built-in to improve efficiency at low current set-
tings. Low external parts count (two 1µF flying
capacitors and two small 1µF capacitors at VIN and
OUT) makes the AAT3120 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 each LED at eight different levels.
• VIN Range: 2.7V to 5.5V
• Fractional Charge Pump Mode
• Drives Low-VF and High-VF Type LEDs
• Up to Three LED Outputs
— Single Wire Programming
— Eight Regulated Current Settings
— Max 20mA per Channel
• Low Noise Constant Frequency Operation
• No Inductors
• 1MHz Switching Frequency
• Small Application Circuit
• Automatic Soft-Start
• IQ <1µA in Shutdown
• 12-Pin TSOPJW Package
The AAT3120 has a thermal management system
to protect the device in the event of a short-circuit
condition at the output pin. Built-in soft-start circuit-
ry prevents excessive inrush current during start-
Applications
up. A high charge pump switching frequency
enables the use of very small external capacitors.
A low current shutdown feature disconnects thewww.DataSheet4U.com
load from VIN and reduces quiescent current to less
than 1µA. The AAT3120 is available in the very
•
•
•
•
Color (RGB) Lighting
Programmable Current Source
White LED Backlighting
White Photo Flash for DSCs
small Pb-free 12-pin TSOPJW package.
Typical Application
VBATTERY
VIN C1+
CIN
1µF
C OUT
1µF
EN/SET
VOUT
C1-
C2+
AAT3120
C2-
EN/SET
GND
D1
D2
D3
C1
1µF
C2
1µF
D3 D2 D1
3120.2005.11.1.1
1
1 page  
Typical Characteristics
Turn-On to Full-Scale Load Switch
ENSET
(2V/div)
CP
(2V/div)
VDIODE
(2V/div)
IIN
(200mA/div)
Time (100µs/div)
AAT3120
3-Channel Charge Pump
For White LED Applications
Turn-On to Full-Scale Charge Pump
ENSET
(2V/div)
CP
(2V/div)
VDIODE
(2V/div)
IIN
(200mA/div)
Time (100µs/div)
Turn-Off from Full-Scale Charge Pump
ENSET
(2V/div)
VDIODE
(2V/div)
IIN
(100mA/div)
Time (400µs/div)
IDIODE vs. Input Voltage
(3x20mA)
65
62 VF = 3.4V
59
56 VF = 3.0V VF = 3.2V
53
50
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1
Input Voltage (V)
IDIODE vs. Input Voltage
(3x8.3mA)
30
27 VF = 3.4V
24
21 VF = 3.0V VF = 3.2V
18
15
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1
Input Voltage (V)
3120.2005.11.1.1
5
5 Page 
ESR is an important characteristic to consider when
selecting a capacitor. ESR is a resistance internal
to a capacitor, which is caused by the leads, inter-
nal connections, size or area, material composition,
and ambient temperature. Capacitor ESR is typi-
cally measured in milliohms for ceramic capacitors
and can range to more than several ohms for tan-
talum or aluminum electrolytic capacitors.
Ceramic Capacitor Materials
Ceramic capacitors less than 0.1µF are typically
made from NPO or C0G materials. NPO and C0G
materials typically have tight tolerance and are sta-
ble over temperature. Large capacitor values are
typically composed of X7R, X5R, Z5U, or Y5V
dielectric materials. Large ceramic capacitors, typ-
ically greater than 2.2µF, are often available in low-
cost Y5V and Z5U dielectrics, but capacitors
greater than 1µF are typically not required for
AAT3120 applications.
AAT3120
3-Channel Charge Pump
For White LED Applications
Capacitor area is another contributor to ESR.
Capacitors that are physically large will have a lower
ESR when compared to an equivalent material
smaller capacitor. These larger devices can improve
circuit transient response when compared to an
equal value capacitor in a smaller package size.
Thermal Protection
The AAT3120 has a thermal protection circuit that
will shut down the internal LDO and charge pump
if the die temperature rises above the thermal limit,
as is the case during a short circuit of the OUT pin.
Charge Pump Compatibility
The AAT3120 is pin-compatible with the AAT3113
in TSOPJW-12 packages, with no D4 output.
Compared to the AAT3113, the AAT3120 offers an
improved overall efficiency, wider operating range,
and the ability to drive high-VF type LEDs (up to
4.3V) at full current from a 3V input condition. The
AAT3120 is well suited for battery-powered appli-
cations using single-cell Lithium-Ion (Li-Ion) batter-
ies (4.2V to 2.8V), Lithium Polymer batteries, and
3-series connected dry cells (3.6V).
3120.2005.11.1.1
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AAT3120.PDF ] | |
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