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AAT3120 데이터시트 PDF




AAT에서 제조한 전자 부품 AAT3120은 전자 산업 및 응용 분야에서
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부품번호 AAT3120 기능
기능 3-Channel Charge Pump
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AAT3120 데이터시트, 핀배열, 회로
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




AAT3120 pdf, 반도체, 판매, 대치품
AAT3120
3-Channel Charge Pump
For White LED Applications
Electrical Characteristics1
CIN = COUT = C1 = C2 = 1.0µF; TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C,
VIN = 3.5V.
Symbol Description
Input Power Supply
VIN Operation Range
ICC Operating Current
ISHDN
IDX
I(D-Match)
Shutdown Current
Output Current
Current Matching Between
Any Two Outputs
Charge Pump Section
TSS
FCLK
EN/SET
Soft-Start Time
Clock Frequency
VEN(L)
VEN(H)
TEN/SET LO
TEN/SET HI
TOFF
Input Current
Enable Threshold Low
Enable Threshold High
EN/SET Low Time
Minimum EN/SET High Time
EN/SET Off Timeout
EN/SET Input Leakage
Conditions
3.0V VIN 5.5V, Active,
No Load Current
EN = 0
3.0 VIN 5.5
VD1:D3 = 3.6, VIN = 3.5V
2.7V VIN 5.5V
2.7V VIN 5.5V
Min Typ Max Units
2.7 5.5 V
1.8 3.0 mA
1.0 µA
18 20 22 mA
0.5 %
200
1000
µs
kHz
0.4 V
1.4 V
0.3 75 µs
50 ns
500 µs
-1 1 µA
1. The AAT3120 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured
by design, characterization, and correlation with statistical process controls.
4 3120.2005.11.1.1

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AAT3120 전자부품, 판매, 대치품
Functional Block Diagram
AAT3120
3-Channel Charge Pump
For White LED Applications
VIN
Soft-Start
Control
1MHz
Oscillator
Voltage
Reference
1X / 1.5X
Charge
Pump
C1+
C1-
C2+
C2-
OUT
EN/SET
Single-Wire
Interface
Current
Reference
32 x 16 bit
ROM
GND
Quad
Output
DAC
D1
D2
D3
Functional Description
The AAT3120 is a dual mode load switch (1X) and
high efficiency (1.5X) fractional charge pump
device intended for white LED backlight applica-
tions. The fractional charge pump consists of a low
dropout linear voltage regulator followed by a 1.5X
charge pump with multiple current source outputs.
To maximize power conversion efficiency, an inter-
nal feedback control sensing circuit monitors the
voltage required on the constant current source
outputs. This control circuit then sets the load
switch and charge pump functions based upon the
input voltage level versus the output voltage level
needed. The 1X load switch / 1.5X charge pump
mode is decided on the voltage sensed on the out-
put D1. Switchover between the 1.5X (charge-
pump) operating mode and the 1X (load switch)
mode occurs automatically (as a function of input
and output voltages) and does not require user
intervention to maintain maximum efficiency.
3120.2005.11.1.1
The AAT3120 requires only four external compo-
nents: two 1µF ceramic capacitors for the charge
pump flying capacitors (C1 and C2), one 1µF
ceramic input capacitor (CIN), and one 0.33µF to
1µF ceramic output capacitor (COUT). The LDO /
1.5X charge pump output is converted into three
(D1 to D3) constant current outputs to drive three
individual LEDs with a maximum current of 20mA
each. The current source output magnitude is con-
trolled by the EN/SET serial data single-wire inter-
face. The interface records rising edges of the
EN/SET pin and decodes them into eight individual
current level settings (see Table 1, Current Level
Settings). 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 transitions to a logic low state.
7

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