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AAT2805 데이터시트 PDF




AAT에서 제조한 전자 부품 AAT2805은 전자 산업 및 응용 분야에서
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부품번호 AAT2805 기능
기능 Dual High Efficiency Charge Pump
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AAT2805 데이터시트, 핀배열, 회로
AAT2805
Dual High Efficiency Charge Pump
for White LED and Flash Applications
General Description
Features
ChargePump
The AAT2805 is a dual charge pump designed to
support both the white LED backlight and flash appli-
• VIN Range: 2.7V to 5.5V
• Dual Charge Pump to Support Backlight and
cations for systems operating with lithium-ion/poly-
Flash LEDs
mer batteries. The backlight charge pump is capable
• Backlight Charge Pump:
of driving up to four LEDs at a total of 120mA. The
— Regulated Current
current sinks may be operated individually or in par-
— Four Current Sink Inputs
allel for driving higher current LEDs. To maximize
— AS2Cwire Brightness Control
power efficiency, the charge pump operates in 1X,
— Tri-Mode Charge Pump
1.5X, or 2X mode, where the mode of operation is
— Maximum 30mA of Current Per Input
automatically selected by comparing the forward
voltage of each LED with the input voltage.
— Low IQ (50µA) in Light Load Mode
• Flash Charge Pump:
AnalogicTech's AS2Cwire™ (Advanced Simple Serial
— Regulated Output Voltage
Control™) serial digital input is used to enable, dis-
— Up to 250mA of Pulsed Current
able, and set current for each LED with a 16-level
• Independent Backlight/Flash Control
logarithmic scale plus four low-current settings down
• Low Noise 1MHz Constant Frequency
to 50µA for optimized efficiency, with a typical oper-
Operation
ating quiescent current of less than 50µA.
• Automatic Soft-Start
The flash charge pump is a charge pump doubler
with a regulated output voltage. It is designed to
• No Inductors
• Available in TDFN44-16 Package
deliver 120mA of continuous current and up to
250mA of pulsed current. It has an independent
enable pin for improved power savings.
www.DataSheet4U.com
The AAT2805 has thermal protection and built-in
Applications
soft-start circuitry. A low-current shutdown feature
disconnects the load from VIN and reduces quiescent
current to less than 1µA.
• Color (RGB) Lighting
• White LED Backlighting
• White LED Photo Flash
The AAT2805 is available in a space-saving, ther-
mally-enhanced TDFN44-16 package and is rated
over the -40°C to +85°C temperature range.
Typical Application
VIN CIN
1µF
EN/SET
EN_FLSH
C1 C2 C3
1µF 1µF 1µF
C1+ C1- C2+ C2- C3+ C3-
VOUT_FL
VIN
AAT2805
VOUT_BL
EN/SET
EN_FLSH
GND
D1
D2
D3
D4
VOUT_FLASH
COUT
1µF
Flash
Backlight
D1 D2 D3 D4
COUT
1µF
2805.2005.05.1.2
1




AAT2805 pdf, 반도체, 판매, 대치품
AAT2805
Dual High Efficiency Charge Pump
for White LED and Flash Applications
Electrical Characteristics1
VIN = 3.6V; CIN = COUT = C1 = C2 = C3 = 1.0µF; TA = -40°C to- 85°C unless otherwise noted.
Typical values are at TA = 25°C.
Symbol Description
Input Power Supply
VIN Operation Range
ICC Operating Current
ISHDN
IDX
I(D-Match)
RSINK
Shutdown Current
Input Current Accuracy2, 4
Current Matching Between Any
Two Current Sink Inputs2, 5
Sink Switch Impedance (each)2
Flash Charge Pump Output
VOUT_FL Voltage
IOUT_FL
TSS
FCLK
VEN(L)
VEN(H)
TEN/SET LO
TEN/SET HI
TOFF
TLAT
II
Maximum Continuous IOUT
Maximum Pulsed IOUT
Soft-Start Time
Clock Frequency
Enable Threshold Low
Enable Threshold High
EN/SET Low Time
Minimum EN/SET High Time
EN/SET Off Timeout
EN/SET Latch Timeout
Enable and EN/SET Input
Leakage
Conditions
Min Typ Max Units
2.7 5.5
1X Mode, 3.0 VIN 5.5, Active, No Load
Current; EN_FLSH = GND, EN/SET = VIN
1.5X Mode, 3.0 VIN 5.5, Active, No Load
Current; EN_FLSH = GND, EN/SET = VIN
2X Mode, 3.0 VIN 5.5, Active, No Load
Current; EN_FLSH = GND, EN/SET = VIN
EN_FLSH = GND, 50µA Output Setting,
0.3 1
1.0 3.0
1.0 3.0
50
1X Mode
3.0 VIN 5.5, No Load Current;
EN_FLSH = VIN, EN/SET = GND
EN_FLSH = EN/SET = 0
2.0 4.5
1.0
ISET = 30mA; TA = 25°C
VD1:D4 = 3.6, VIN = 3.5V
-10 10
0.5
V
mA
µA
mA
µA
%
%
3.0V < VIN < 5V, IOUT = 100mA;
EN_FLSH = VIN
3.0V < VIN < 5V, IOUT = 150mA;
EN_FLSH = VIN
VIN = 3.6V; VOUT = 4.5V; EN_FLSH = VIN
VIN = 3.6V; VOUT = 4.5V; IPULSED < 500mS
VEN/SET < 0.6V
VEN/SET > 1.4V
VEN/SET < 0.6V
VEN/SET > 1.4V
VEN/SET = VEN_FLSH = VIN
7
4.32 4.5 4.68
4.3 4.5 4.7
V
120 mA
250
100 µs
1.0 MHz
0.4 V
1.4 V
0.3 75 µs
50 ns
500 µs
500 µs
-1.0 1.0 µA
1. The AAT2805 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.
2. Specification applies only to the tri-mode charge pump.
3. Specification applies only to the charge pump doubler.
4. Determined by the sum of all active channels
5. Current matching is defined as the deviation of any sink current from the average of all active channels.
4 2805.2005.05.1.2

4페이지










AAT2805 전자부품, 판매, 대치품
AAT2805
Dual High Efficiency Charge Pump
for White LED and Flash Applications
Typical Characteristics–White LED Backlight Driver Section
Turn-On to 1X Mode
(VIN = 4.2V; 20mA Load)
Turn-On to 1.5X Mode
(VIN = 3.5V; 20mA Load)
EN
(2V/div)
CP
(2V/div)
VSINK
(500mV/div)
IIN
(200mA/div)
100µs/div
EN
(2V/div)
CP
(2V/div)
VSINK
(500mV/div)
IIN
(200mA/div)
100µs/div
EN
(2V/div)
CP
(2V/div)
VSINK
(500mV/div)
IIN
(200mA/div)
Turn-On to 2X Mode
(VIN = 2.8V; 20mA Load)
100µs/div
EN
(2V/div)
VF
(1V/div)
IIN
(100mA/div)
Turn-Off from 1.5X Mode
(VIN = 3.5V; 20mA Load)
500µs/div
Efficiency vs. Supply Voltage
100
90 4.1mA
80 VF = 2.9V
70
60
50
40
1mA
10.2mA
30
VF = 2.7V
VF = 3.1V
20mA
VF = 3.4V
20
10
0
2.6 2.8 2.9 3.1 3.2 3.4 3.6 3.7 3.9 4.0 4.2
Supply Voltage (V)
Current Matching vs. Temperature
20.4
20.2 Channel 2
20.0
Channel 4
19.8
19.6
19.4
19.2
19.0
-40
-20
Channel 3 Channel 1
0 20 40
Temperature (°C)
60
80
2805.2005.05.1.2
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