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부품번호 AAT3134ISN-T1 기능
기능 High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications
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AAT3134ISN-T1 데이터시트, 핀배열, 회로
AAT3134
High Efficiency 1X/1.5X Fractional
Charge Pump for White LED Applications
General Description
The AAT3134 is a low noise, constant frequency
charge pump DC/DC converter that uses a dual
mode Load Switch (1X) and fractional (1.5X) con-
version to maximize efficiency for White LED appli-
cations. The device can be used to produce current
levels up to 20mA in each of its six outputs to drive
LED's from a 2.7V to 5.5V input. Outputs may be
operated individually or paralleled for driving high-
er-current LED's. Low external parts counts (two
1µF flying capacitors and two small 1µF capacitors
at VIN, and OUT) make the AAT3134 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 in two groups of four outputs and
two outputs with multiple level independently con-
trolled brightness scales. The AAT3134 has a ther-
mal management system to protect the device in
the event of a short circuit condition at the output
pin. Built-in soft-start circuitry prevents excessive
inrush current during start-up. A high charge pump
switching frequency enables the use of very small
external capacitors. A low current shutdown feature
disconnects the load from VIN and reduces quies-
cent current to less than 1µA. The AAT3134 is
available in a 16-pin quad QFN package.
Features
ChargePump
• VIN Range: 2.7 - 5.5 Volts
• < 1.0µA of Shutdown
• 1 MHz Switching Frequency
• Fully Independent Display Lighting
• Dual Mode 1x and 1.5x Charge Pump for
Maximum Efficiency
• Drives Low-VF & High-VF Type LED's
• Up to Six 20mA Outputs
• Multi Position Brightness Scale with Digital
Control
• Low Noise Constant Frequency Operation
• Small Application Circuit
• Regulated Output Current
• Automatic Soft-Start
• No Inductors
• 16-pin QFN package
• -40 to +85°C Temperature range
Applications
• White LED Backlighting
• White Photo-Flash for DSC's
• Color (RGB) Lighting
• Programmable Current Source
Typical Application
VBATTERY
VIN C1+
CIN COUT
1µF 1µF
EN/SET
VOUT
C1-
C2+
AAT3134
EN/SET
C2-
D1
D2
D3
D4
D5
D6
GND
3134.2004.04.1.0
C1
1µF
C2
1µF
D4 D3 D2 D1
D6 D5
Sub
Display
Main
Display
1




AAT3134ISN-T1 pdf, 반도체, 판매, 대치품
AAT3134
High Efficiency 1X/1.5X Fractional
Charge Pump for White LED Applications
Typical Characteristics
(Unless otherwise noted, VIN = 3.5V, CIN = COUT = C1 = C2 = 1µF, TA = 25°C)
Efficiency vs. VIN (4x20mA)
IDIODE vs. VIN (4x20mA)
100%
95%
90%
VDIODE = 3.3V
85%
80%
VDIODE = 3.4V
75%
70%
VDIODE = 3.5V
65%
60%
VDIODE = 3.6V
55%
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
VIN (V)
5.1
90
85
80
75
70
65
60
55
50
45
40
2.7
VDIODE = 3.3V
VDIODE = 3.4V VDIODE = 3.5V
VDIODE = 3.6V
2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7
4.9
VIN (V)
5.1
Quiescent Current vs. VIN
VIH and VIL vs. VIN
2.4 0.850
2.2
2.0
1.8
1.6
1.4
1.2
VDIODE = 3.3V
1.0 VDIODE = 3.4V
0.8 VDIODE = 3.5V
0.6
0.4
VDIODE = 3.6V
0.2
0.825
0.800
0.775
0.750
0.725
0.700
0.675
0.650
0.625
VIH
VIL
0.0 0.600
2.50
3.00
3.50
4.00
4.50
5.00
5.50
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
VIN (V)
4 3134.2004.04.1.0

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AAT3134ISN-T1 전자부품, 판매, 대치품
AAT3134
High Efficiency 1X/1.5X Fractional
Charge Pump for White LED Applications
constant over these address ranges which provides
orthogonal control of the two channels. For address-
es 1 to 6, D5 and D6 are set to 0mA, addresses 7 to
12 are 1mA, addresses 13 to 18 are 10mA, address-
es 19 to 24 are 12mA, and addresses 25 to 30 are
15mA. For maximum brightness control, addresses
31 and 32 set D5 and D6 to the maximum 20mA
level. For design flexibility, D1-D4 are set to 0mA at
address 31, and 20mA at address 32. This is sum-
marized in table and figure 1.
The modulo 32 interface wraps states back to state 1
after the 32nd clock. With each EN/SET pulse, the
output current changes to the next setting in the
address decoding. To change settings to the previ-
ous address decoding, 31 EN/SET clock pulses are
required. The counter can be clocked at speeds up to
1MHz, so intermediate states are not visible. The first
rising edge of EN/SET enables the IC and initially
sets the output LED currents 0mA. Additional clocks
are required to set the desired current level. Once
the final clock cycle is input for the desired brightness
level, the EN/SET pin is held high to maintain the
device output current at the programmed level. The
device is disabled 500µs after the EN/SET pin transi-
tions to a logic low state.
Applications Information
Constant Current Output Level Settings
The constant current source output amplitude for out-
put D1 to D4 and D5 to D6 are set via the serial inter-
face according to the scale described in figure 1 and
the previous section. Because the outputs D1 to D6
are true independent constant current sources, the
voltage observed on any single given output will be
determined by the actual forward voltage (VF) for the
LED being driven.
Since the output current of the AAT3134 is program-
mable through the S2CWire serial interface, no PWM
(pulse width modulation) or additional control circuit-
ry is needed to control LED brightness. This feature
greatly reduces the burden on a microcontroller or
system IC to manage LED or display brightness,
allowing the user to "set it, and forget it."
Furthermore, with its high speed serial interface
(1MHz data rate), the output current of the AAT3134
can be changed successively to brighten or dim
LED's, in smooth transitions (e.g. to fade-out) or in
abrupt steps, giving the user complete programma-
bility and real time control of LED brightness.
Output Current Level Settings
20
18
16
14
12
10
8
6
4
2
0
Address Code
Figure 1.
3134.2004.04.1.0
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AAT3134ISN-T1

High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications

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