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AAT3351 데이터시트 PDF




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부품번호 AAT3351 기능
기능 High Efficiency 1x/1.5x Charge Pump
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AAT3351 데이터시트, 핀배열, 회로
www.DataSheet4U.com
ChargePumpTM
General Description
The AAT3351 is a low-noise, constant-frequency charge
pump DC/DC converter that uses a dual-mode load
switch (1x) and fractional (1.5x) charge pump to maxi-
mize efficiency for white LED applications. AAT3351 is
capable of driving 4 white LEDs at a total of 120mA from
single 2.7V to 5.5V input. The current sinks may be
operated individually or in parallel while driving higher-
current LEDs. A low external parts count (two 1μF flying
capacitors and two small 1μF capacitors at VIN and VOUT)
makes the AAT3351 ideal for small battery-powered
applications.
Analogic Tech’s S2Cwire™ serial digital input is used to
enable, disable, and set current to one of 32 levels for
the LEDs.
The AAT3351 is equipped with built-in short-circuit pro-
tection. The soft-start circuitry prevents excessive inrush
current at start-up and mode transitions. The AAT3351
family is available in Pb-free, space-saving TSOPJW and
TDFN33 packages, and operates over the -40°C to
+85°C ambient temperature range.
PRODUCT DATASHEET
AAT3351
High Efficiency 1x/1.5x Charge Pump
Features
• Drives up to 4 LEDs at up to 30mA, each
• Automatic Switching Between 1x and 1.5x Modes
• 1MHz Switching Frequency
• Linear LED Output Current Control
Single-wire, S2Cwire Interface
32-step
• ±10% LED Output Current Accuracy
• 3% LED Output Current Matching
• Low-Current Shutdown Mode
• Automatic Soft-Start
• TSOPJW-12 and TDFN33-12 Packages
Applications
• Cellular and Smart Phones
• Digital Still and Video Cameras
• PDAs
• Portable Devices
• Portable Media Players
• Other White LED Backlighting
Typical Application
C1
1µF
VBATTERY
3.6V
C IN
1µF
EN/SET
S2Cwire Serial Control
C1+ C2+
C1- C2-
IN OUT
AAT3351
EN/SET
D1
D2
D3
D4
GND
C2
1µF
D1 D2 D3 D4
C OUT
1µF
3351.2009.02.1.0
www.analogictech.com
1




AAT3351 pdf, 반도체, 판매, 대치품
www.DataSheet4U.com
ChargePumpTM
PRODUCT DATASHEET
AAT3351
High Efficiency 1x/1.5x Charge Pump
Electrical Characteristics
VIN = 3.6V; CIN = COUT = 1μF; C1 = C2 = 1μF; TA = -40°C to 85°C unless otherwise noted. Typical values are TA = 25°C.
Symbol Description
Input Power Supply
VIN Input Voltage Range
IIN Input Operating Current
IIN(SHDN)
Shutdown Current
VIN_(TH)
Charge Pump Mode Hysteresis
LED Current Sink Outputs
ID_(MAX)
D1-D4 Current Accuracy
ID_(DATA31)
D1-D4 Current Accuracy
ΔI(D_X)/ID_AVG) D1-D4 Current Matching1
VD_(TH)
Hysteresis for Mode Change
IOUT(MAX)
Charge Pump Maximum Output Current
fOSC Clock Frequency
VD_(TH)
Charge Pump Mode Transition Threshold
tSS Charge Pump Startup Time
EN/SET S2Cwire Control
VENH
VENL
IEN(LKG)
tEN/SET(HI_MIN)
tEN/SET(HI_MAX)
tEN/SET(LOW)
t EN/SET(OFF)
tEN/SET(LAT)
EN/SET Input High Threshold Voltage
EN/SET Input Low Threshold Voltage
EN Input Leakage Current
EN/SET Minimum High Time
EN/SET Maximum High Time
EN/SET Input Low Time
EN/SET Input OFF Timeout
EN/SET Input Latch Timeout3
Conditions
Min Typ Max Units
-40°C TA 85°C
EN/SET = IN
1x Mode, ID1 = ID2 = ID3
= ID4 = OFF
1.5x Mode, ID1 = ID2 = ID3
= ID4 = OFF
EN/SET = GND
1x to 1.5x Transition at Any IDX
2.7
EN/SET = S2C DATA 1
EN/SET = S2C DATA 31
EN/SET = S2C DATA 1, ID1 = ID2 = ID3 =
ID4 = 30mA
ID1 = ID2 = ID3 = ID4 = 30mA, 1.5x to 1x
Mode
VIN = 3.0V, VF = 4.0V
27
EN/SET = IN; VIN - VF = 1V
5.5
24
6
0.15
7.2
1
30 33
0.5
±3
0.15
150
1
0.15
150
0.25
V
mA
μA
V
mA
mA
%
V
mA
MHz
V
μs
EN/SET = IN = 5V
1.4 V
0.4 V
-1 1 μA
50 ns
75 μs
0.3 75 μs
500 μs
500 μs
1. LED current match is defined as 100 (IDX - IAVG)/IAVG.
2. 1x mode output impedance is defined as (VIN - VOUT)/IOUT.
3. If the part has been shut down, the latch time will be 500μs longer for soft start of charge pump.
4 www.analogictech.com
3351.2009.02.1.0

4페이지










AAT3351 전자부품, 판매, 대치품
www.DataSheet4U.com
ChargePumpTM
PRODUCT DATASHEET
AAT3351
High Efficiency 1x/1.5x Charge Pump
Typical Characteristics
VIN = 3.6V, CIN = COUT = C1 = C2 = 1μF; TA = 25°C, unless otherwise noted.
Turn-Off from 1.5x Mode Backlight
(VIN = 3.3V; 30mA/ch)
EN
(2V/div)
0
VOUT
(4V/div)
0
VBL
(4V/div) 0
IIN
(200mA/div) 0
Time (20ms/div)
3351.2009.02.1.0
www.analogictech.com
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AAT3351

High Efficiency 1x/1.5x Charge Pump

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