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부품번호 AAT3152 기능
기능 High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications
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AAT3152 데이터시트, 핀배열, 회로
www.DataSheet4U.com
AAT3152
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
General Description
Features
ChargePump
The AAT3152 is a low noise, constant frequency
charge pump DC/DC converter that uses a tri-mode
load switch (1X), fractional (1.5X), and doubling (2X)
conversion to maximize efficiency for white LED
applications. The AAT3152 is capable of driving
four-channel LEDs from a 2.7V to 5.5V input. The
current sinks may be operated individually or in par-
allel for driving higher-current LEDs. Low external
parts count (two 1µF flying capacitors and two small
1µF capacitors at VIN and VOUT) makes this part ide-
ally 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 with eight settings (20mA
down to 50µA) including main/sub-display group
control. The AAT3152 consumes extremely low cur-
rent internally (80µA typical) at light load for opti-
mized efficiency.
• VIN Range: 2.7V to 5.5V
• Fully Programmable Current with Single Wire
• Eight-Step Current: 20mA to 50µA
• Individual Main-Sub Group Control
• Low IQ (80µA) at Light Load
• Tri-Mode 1X, 1.5X, and 2X Charge Pump for
Maximum Efficiency and VF Coverage
• Drives 1-4 Channels of LEDs
• No Inductors, Low Noise Operation
• 1MHz Constant Switching Frequency
• Small Application Circuit
• Built-In Thermal Protection
• Built-In Auto-Disable for Short-Circuit
• Automatic Soft-Start
• IQ <1µA in Shutdown
• Thermal-Enhanced 3x3mm12-Pin DFN
Package
Each output of the AAT3152 is equipped with built-
in protection for VOUT short circuit and auto-disable
for load short-circuit condition. Built-in soft-start cir-
www.DataSheet4U.comcuitry prevents excessive inrush current during
start-up. A low current shutdown feature discon-
nects the load from VIN and reduces quiescent cur-
rent to less than 1µA.
Applications
• Color (RGB) Lighting
• Programmable Current Sinks
• White LED Backlighting
• White Photo Flash for DSCs
The AAT3152 is available in a space-saving, ther-
mal-enhanced 12-pin 3x3mm DFN package.
Typical Application
2.7V to 5.5V
VIN C1+
CIN
1µF
C1-
C2+
AAT3152
C2-
VOUT
EN/SET
EN/SET
GND
D1
D2
D3
D4
C1
1µF
C2
1µF
D1 D2 D3 D4
COUT
1µF
3152.2004.12.0.9
1
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AAT3152 pdf, 반도체, 판매, 대치품
www.DataSheet4U.com
AAT3152
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
Electrical Characteristics1
CIN = COUT = C1 = C2 = 1.0µF; TA = -40°C - 85°C, unless otherwise noted.
Typical values are at TA = 25°C, VIN = 3.6V.
Symbol Description
Conditions
Min Typ Max Units
Input Power Supply
VIN Operation Range
1X Mode, 3.0 VIN 5.5, Active,
No Load Current
2.7
0.3
ICC Operating Current
1.5X Mode, 3.0 VIN 5.5, Active,
No Load Current
2X Mode, 3.0 VIN 5.5, Active,
No Load Current
1
1.5
50µA Setting, 1X Mode
80
ISHDN
IDX
I(D-Match)
VTH
Shutdown Current
ISINK Average Current Accuracy
Current Matching (Note 2)
1X to 1.5X or 1.5X to 2X Transition
Threshold at Any Current Sink Pin
EN/SET = 0
ISET = 20mA, TA = 25°C
VF:D1:D4 = 3.6V
-10
150
Charge Pump Section
TSS Soft-Start Time
100
FCLK
www.DataSheet4U.comEN/SET
Clock Frequency
1000
VEN(L)
VEN(H)
TEN/SET LO
TEN/SET HI
TOFF
TLAT
IEN/SET
Enable Threshold Low
Enable Threshold High
EN/SET Low Time
Minimum EN/SET High Time
EN/SET Off Timeout
EN/SET Latch Timeout
EN/SET Input Leakage
VEN/SET <0.6V
VEN/SET >1.4V
VEN/SET <0.6V
VEN/SET >1.4V
1.4
0.3
50
-1
5.5
1
3
3
1
10
12
0.4
75
500
500
1
V
mA
µA
µA
%
%
mV
µs
kHz
V
V
µs
ns
µs
µs
µA
Notes:
1. The AAT3152 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. Current matching is defined as the deviation of any sink current from the average of all active channels.
4 3152.2004.12.0.9
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AAT3152 전자부품, 판매, 대치품
www.DataSheet4U.com
AAT3152
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
Constant Current Output Level Settings
AAT3152 Current Setting
The constant current sink levels for D1 to D4 are
set via the serial interface. No PWM (pulse width
modulation) or additional control circuitry 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." With its high-speed
serial interface (up to 1MHz data rate), the input
sink current of the AAT3152 can be changed suc-
cessively to brighten or dim LEDs, giving the users
real-time control of LED brightness. Because the
inputs D1 to D4 are true independent constant cur-
rent sinks, the voltage observed on any single
given input will be determined by the actual forward
voltage (VF) for the LED being driven.
Data
1
2
3
4
5
6
7
8
9
10
11
Main Group
(D1-D3)
IOUT (mA)
20
14
10
7
20
14
10
7
0
0
0
Sub Group
(D4)
IOUT (mA)
20
14
10
7
0
0
0
0
20
14
10
S2Cwire Serial Interface
12 0
13 0.05
7
0.05
The current sink input magnitude on the AAT3152
14 0.5
0.5
is controlled by AnalogicTech's S2Cwire serial digi- 15 1
1
tal input. It relies on the number of rising edges of 16 2
2
the EN/SET pin to address and load the registers.
S2Cwire latches data or address after the EN/SET
www.DataSheet4U.compin has been held high for time TLAT. The interface
The EN/SET timing is designed to accommodate a
wide range of data rates. After the first rising edge
records rising edges of the EN/SET pin and
of EN/SET, the charge pump is enabled and reach-
decodes them into 16 different states, as indicated
in the Current Setting table. There are four bright-
es full capacity after the soft-start time (TSS). During
the soft-start time, multiple clock pulses may be
ness levels for main or sub-display group with the
entered on the EN/SET pin to set the final output
possibility of individually turning ON or OFF each
current level with a single burst of clocks.
group. To further optimize power efficiency, the
Alternatively, the EN/SET clock pulses may be
AAT3152 also offers four low-current levels for dim
entered one at a time to gradually increase the
LED operation (data 13-16). During this low current
LED brightness over any desired time period. The
mode, the internal supply current reduces to only
current outputs remain constant as long as
80µA typical.
EN/SET remains in a logic high state. The current
The counter can be clocked at speeds up to 1MHz,
outputs are switched off after EN/SET has
such that intermediate states are not visible. The
first rising edge of EN/SET enables the IC and ini-
remained in a low state for at least the TOFF timeout
period; then, the AAT3152 enters shutdown mode
tially sets the output LED current to 20mA. Once
the final clock cycle is input for the desired bright-
and draws less than 1µA from VIN. Data are reset
to 0 during shutdown.
ness level, the EN/SET pin is held high to maintain
the device output current at the programmed level.
The device is disabled 500µs (TOFF) after the
EN/SET pin transitions to a logic low state.
3152.2004.12.0.9
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부품번호상세설명 및 기능제조사
AAT3151

High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications

Advanced Analogic Technologies
Advanced Analogic Technologies
AAT3152

High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications

Advanced Analogic Technologies
Advanced Analogic Technologies

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