AAT2869 - Skyworks Solutions, Inc.

DATA SHEET
AAT2869
Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs
General Description
Features
The AAT2869 is a low-noise, constant-frequency charge
pump DC/DC converter that uses a dual-mode load
switch (1x) and fractional (1.5x) conversion to maximize
efficiency for white LED applications. The AAT2869 is
capable of driving 4 white LEDs at a total of 124mA from
a 2.7V to 5.5V input. The current sinks may be operated
individually or in parallel for driving higher-current LEDs.
A low external parts count (two 1μF flying capacitors and
two small 1μF capacitors at IN and OUTCP) makes the
AAT2869 ideally suited for small battery-powered applications. The fade-in/fade-out feature makes backlight
turn-on/turn-off more visual comfortable. The AAT2869
also includes two 150mA low, drop-out linear regulators
as additional power supplies for display and related camera power. The LDO voltage is also programmable.
• 2.7V to 5.5V Supply Voltage Range
• Charge Pump for LED Driver
▪ Dual Mode 1x/1.5x
▪ Drives up to 4 LEDs with up to 31mA each
▪ Linear LED Output Control Options
•Maximum LED Current Set by AS2Cwire Interface,
32 Steps
•Fade In and Fade Out
•0.9MHz Constant Frequency
•Automatic Soft-Start Limits Inrush Current
• Dual 150mA LDOs
▪ Five Voltages with 1.2V, 1.5V, 1.8V, 2.8V, and 3.0V,
Sixteen Combinations Set by AS2Cwire
▪ Enable Control Independently by AS2Cwire
▪ Integrated Discharge Resistor when Disabled
• < 1.0μA in Shutdown
• Short Circuit Protection
• Small Application Circuit
• -40°C to 85°C Temperature Range
• RoHS Compliant, Halogen-Free TQFN3.0x2.2-18
Package
Skyworks’ Advanced Simple Serial Control™ (AS2Cwire™)
serial digital input is used to enable, disable and set the
maximum LED current to one of 32 levels for the LEDs,
to enable/disable the LDOs, and to set the LDO's output.
The programmable LED current ranges from 31mA to
0.4mA.
Each output of the AAT2869 is equipped with built-in
protection for short-circuit and auto-disable for load
short-circuit conditions. The soft-start circuitry prevents
excessive inrush current at charge pump start-up and
mode transitions. The AAT2869 is available in the Pb-free,
space-saving TQFN3.0x2.2-18L package, and operates
over the -40°C to 85°C ambient temperature range.
Applications
•
•
•
•
•
•
Camera Phones
Digital Still Cameras (DSCs)
LED Photo Flash/Torch
MP3 Players
PDAs and Notebook PCs
Smartphones
Typical Application
C1
1μF
VIN
2.7~5.5V
CIN
2.2μF
AS2Cwire
CF
1μF
C1+
C2+
C1C2OUTCP
IN
INLDO
AAT2869
D1
D2
D3
EN/SET
D4
LDOA
FCAP
LDOB
AGND
GND
C2
1μF
WLEDs
COUT
1μF
D1
D2
D3
D4
LDOA
LDOB
CLDOB
2.2μF
CLDOA
2.2μF
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012
1
DATA SHEET
AAT2869
Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs
Pin Descriptions
Pin #
Symbol
Function
1
C1+
I
2
LDOB
O
3
LDOA
O
4, 8
5
GND
AGND
PG
AG
6
INLDO
P
7
IN
P
9
FCAP
I
10
11
12
13
D1
D2
D3
D4
I
I
I
I
14
EN/SET
I
15
16
17
18
EP
C2C2+
OUTCP
C1-
I
I
O
I
Description
Flying capacitor C1 positive terminal. Connect a 1μF capacitor between C1+ and C1-.
LDOB output. Four output voltages can be programmed by AS2Cwire: 1.2V, 1.5V, 1.8V, and 2.5V.
2.8V is the default output voltage.
LDOA output. Four output voltages can be programmed by AS2Cwire: 1.5V, 1.8V, 2.5V, and 3.0V.
1.8V is the default output voltage.
Ground connection.
Analog ground connection.
Input power supply pin to LDOs. Connect this pin to IN. A 1μF capacitor is recommended for
bypass use from this pin to ground.
Input power supply pin. Connect a 1μF bypass capacitor from this pin to ground.
Fade-in/fade-out filter. Connect a 1μF capacitor to enable fade-in time of 1s at 20mA LED current
each. If the fade-in/fade-out function is not used, leave this pin floating.
LED driver current sink D1. Connect LED cathode to this pin. If not used, please tie to OUTCP.
LED driver current sink D2. Connect LED cathode to this pin. If not used, please tie to OUTCP.
LED driver current sink D3. Connect LED cathode to this pin. If not used, please tie to OUTCP.
LED driver current sink D4. Connect LED cathode to this pin. If not used, please tie to OUTCP.
Charge pump enable/set. When in the low state, AAT2869 is powered down, and consumes less
than 1μA. When EN/SET jumps from low to high, the charge pump is active and 20mA LED current each are set. The two LDOs are still inactive until data 3 is written to address 4 through the
AS2Cwire interface. This pin should not be left floating.
Flying capacitor C2 negative terminal. Connect a 1μF capacitor between C1+ and C1-.
Flying capacitor C2 positive terminal. Connect a 1μF capacitor between C2+ and C2-.
Charge pump output. Connect a 1μF bypass capacitor between this pin to ground.
Flying capacitor C1 negative terminal. Connect a 1μF capacitor between C2+ and C2-.
Exposed pad. Connect to ground directly beneath the package.
Pin Configuration
TQFN3.0x2.2 -18
(Top View)
C1+
LDOB
LDOA
GND
1
2
3
4
AGND
INLDO
IN
GND
FCAP
5
18
6
17
7
16
8
15
9
14
C1OUTCP
C2+
C2EN/SET
13
12
11
10
D4
D3
D2
D1
2
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012
DATA SHEET
AAT2869
Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs
Absolute Maximum Ratings1
Symbol
VIN
VEN
Description
Input Voltage
EN to GND Voltage
Maximum EN to Input Voltage or GND
Maximum DC Output Current (continuous)2
Maximum Junction Operating Temperature
Maximum Soldering Temperature (at leads, 10 sec.)
VEN(MAX)
IOUT
TJ
TLEAD
Value
Units
-0.3 to 6.0
-0.3 to 6.0
VIN + 0.3
470
-40 to +150
300
V
V
V
mA
Value
Units
O
C
Thermal Information3
Symbol
θJA
θJC
PD
Description
Thermal Resistance from Junction to Ambient
Thermal Resistance from Junction to Case
Maximum Power Dissipation
65.83
38.90
1.5
O
O
C/W
C/W
W
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions
specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Based on long-term current density limitation.
3. Mounted on an FR4 board.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012
3
DATA SHEET
AAT2869
Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs
Electrical Characteristics1
VIN = 3.6V; CIN = 1μF; COUT = 1μF; CFLY = 1μF; CFLT = 56nF; TA = -40°C to 85°C, unless otherwise noted. Typical values
are TA = 25°C.
Symbol
Description
Conditions
Input Power Supply
VIN
Input Voltage Range
VOUT (max)
Maximum Output Voltage
Icc
Operating Current
Shutdown Current
ISHDN(MAX)
Charge Pump Section
IOUT(MAX)
Maximum Output Current
fosc
Oscillator Frequency
tSS
Charge Pump Setup Time
VIN_(TH)
Charge Pump Mode Hysteresis
LED Current Sink Outputs
IDX
ISINK Current Accuracy2
Current Marching Between Any Two
Current Sinks3
VD_(TH)
Charge Pump Mode Transition
AS2Cwire Control and EN/SET Control
VEN/SET (L)
EN/SET
VEN/SET (H)
EN/SET
ILEAK
EN/SET Input Leakage
tEN/SET(LOW)
EN/SET Input Low Time
tEN/SET(HI_MIN) EN/SET Minimum High Time
tEN/SET(HIMAX) EN/SET Maximum High Time
tEN/SET(OFF)
EN/SET Input Off Timeout4
tEN/SET(LAT)
EN/SET Latch Timeout5
Linear Regulators
ΔVOUT[A/B]/
LDOA, LDOB Output Voltage
VOUT[A/B]
Tolerance
IOUT[A/B](MAX) LDOA, LDOB Maximum Load Current
VOUT[A/B](DO) LDOA, LDOB6
∆VOUT/
Line Regulation
VOUT*∆VIN
LDOA, LDOB Power Supply Rejection
PSRR[A/B]
Ratio
LDOA, LDOB Auto-Discharge
ROUT_(DCHG)
Resistance
Thermal
TSD
TJ Thermal Shutdown Threshold
THYS
TJ Thermal Shutdown Hysteresis
IDX(MATCH)
Min
Typ
Max
Units
5.5
V
V
2.7
1x Mode, No Load Current, CP enabled
1.5x Mode, ID1 = FS, excluding ID1, VD2 = VD3 =
VD4 = IN
EN = 0
5.5
0.5
1
2
4
1.0
VF = 3.6V
124
0.9
100
300
1.5x to 1x Transition; ID1 = ID2 = ID3 = ID4 = 31mA
Data 1, TA = 25OC
Data 32 only
-10
VF; D1:D4 = 3.6V
-5
+10
%
+5
120
250
mV
0.4
75
500
500
V
V
mA
μs
ns
μs
μs
μs
2
3.0
150
%
%
mA
mV
1.4
-1
0.3
1
75
50
IOUT = 1mA to 150mA; TA = 25°C
IOUT = 1mA to 150mA; TA = -40°C to +85°C
A
mA
MHz
μs
mV
±15
1x to 1.5x Mode, ID1 = ID2 = ID3 = ID4 = 31mA
mA
-2
-3.0
200
VOUT[A/B] ≥ 3.0V; IOUT = 150mA
100
VIN = (VOUT[A/B] + 1V) to 5V
0.09
%/V
50
dB
720
Ω
140
20
O
IOUT[A/B] =10mA, 1kHz
O
C
C
1. The AAT2869 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assuredby design, characterization, and correlation
with statistical process controls.
2. Determined by the average of all active channels.
3. Current matching is defined as the deviation of any sink current from the average of all active channels.
4. The EN/SET pin must remain logic low (less than VIL) for the duration of longer than 500μs to guarantee the off timeout.
5. The EN/SET pin must remain logic high (greater than VIH) for the duration of longer than 500μs to guarantee the latch timeout.
6. VDO[A/B] is defined as VIN – LDO[A/B] when LDO[A/B] is 98% of nominal.
4
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012
DATA SHEET
AAT2869
Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs
CP Operating Current vs. Input Voltage
CP Operating Current vs. Input Voltage
(1x Mode)
(1.5x Mode)
0.6
3.0
0.5
2.5
0.4
2.0
IQ (mA)
IQ (mA)
Typical Characteristics
0.3
0.2
1.5
1.0
85°C
25°C
-40°C
0.1
0.0
2.7
3.1
3.5
3.9
4.3
4.7
5.1
85°C
25°C
-40°C
0.5
0.0
2.7
5.5
3.1
3.5
Input Voltage (V)
CP Input Current vs. Input Voltage
ISD (μA)
Input Current (A)
5.1
5.5
120
80
VIN = 3.6V
VIN = 5.5V
0.08
0.06
0.04
0.02
40
3.1
3.5
3.9
4.3
4.7
5.1
0.00
-40
5.5
-15
10
LDO Operating Current vs. Input Voltage
0.20
0.20
IOP (mA)
0.25
0.15
0.10
85°C
25°C
-40°C
0.05
3.9
4.3
Input Voltage (V)
85
(LDOA Only)
0.25
3.5
60
LDO Operating Current vs. Input Voltage
(LDOA + LDOB)
3.1
35
Temperature (°°C)
Input Voltage (V)
IOP (mA)
4.7
0.10
VF = 3.3V, ILED = 31mA
VF = 3.2V, ILED = 20mA
VF = 3.1V, ILED = 10mA
VF = 2.9V, ILED = 5mA
160
0.00
2.7
4.3
Shutdown Current vs. Temperature
200
0
2.7
3.9
Input Voltage (V)
4.7
5.1
5.5
0.15
0.10
85°C
25°C
-40°C
0.05
0.00
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012
5
DATA SHEET
AAT2869
Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs
Typical Characteristics
CP Efficiency vs. Input Voltage
Frequency vs. Temperature
950
100
Efficiency (%)
90
80
Frequency (KHz)
VF = 3.3V, ILED = 31mA
VF = 3.2V, ILED = 20mA
VF = 3.1V, ILED = 10mA
VF = 2.9V, ILED = 5mA
70
60
930
910
890
870
50
40
2.7
3.1
3.5
3.9
4.3
4.7
5.1
850
-40
5.5
-15
10
CP Current Matching vs. Temperature
(VIN = 3.6V; VF = 3.3V; 0.5mA/ch)
0.50
32.5
D1
D2
D3
D4
D1
D2
D3
D4
0.46
Current (mA)
31.7
Current (mA)
85
CP Current Matching vs. Temperature
(VIN = 3.6V; VF = 3.3V; 31mA/ch)
30.9
30.1
29.3
0.42
0.38
0.34
28.5
-40
-15
10
35
60
0.30
-40
85
-15
10
Temperature (°C)
60
85
LDO Load Regulation vs. Output Current
(VOUT = 1.2V)
(VOUT = 1.2V)
1.0
1.8
Output Error (%)
85°C
25°C
-40°C
0.6
0.2
-0.2
-0.6
-1.0
2.7
35
Temperature (°C)
LDO Line Regulation vs. Input Voltage
Output Error (%)
60
Temperature (°°C)
Input Voltage (V)
3.1
3.5
3.9
4.3
Input Voltage (V)
6
35
4.7
5.1
5.5
85°C
25°C
-40°C
1.2
0.6
0.0
-0.6
-1.2
-1.8
0.1
1
10
100
Load Current (mA)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012
1000
DATA SHEET
AAT2869
Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs
Typical Characteristics
EN Input Low Threshold Voltage
vs. Input Voltage
1.2
1.2
1.0
1.0
VEN(L) (V)
VEN(H) (V)
EN Input High Threshold Voltage
vs. Input Voltage
0.8
0.6
-40°C
25°C
85°C
0.4
0.2
2.7
3.1
3.5
3.9
4.3
4.7
5.1
0.8
0.6
-40°C
25°C
85°C
0.4
0.2
2.7
5.5
3.1
3.5
Input Voltage (V)
1.0
1.0
VPWM(L) (V)
VPWM(H) (V)
1.2
0.8
0.6
-40°C
25°C
85°C
0.4
3.5
3.9
4.3
4.7
5.1
5.5
PWM Input Low Threshold Voltage
vs. Input Voltage
1.2
3.1
4.3
Input Voltage (V)
PWM Input High Threshold Voltage
vs. Input Voltage
0.2
2.7
3.9
4.7
5.1
0.8
0.6
-40°C
25°C
85°C
0.4
0.2
2.7
5.5
3.1
3.5
Input Voltage (V)
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
EN/SET Input Latch Time vs. Input Voltage
EN/SET Input Off Time vs. Input Voltage
320
360
tEN/SET(OFF) (μs)
tEN/SET(LAT) (μs)
280
240
200
85°C
25°C
-40°C
160
120
2.7
3.1
3.5
3.9
4.3
Input Voltage (V)
4.7
5.1
5.5
300
240
180
120
2.7
85°C
25°C
-40°C
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012
7
DATA SHEET
AAT2869
Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs
Typical Characteristics
CP Turn On
CP Turn Off
(VIN = 3.6V; CIN = COUT = 1μF; CF = 56nF; 20mA/ch)
(VIN = 3.6V; CIN = COUT = 1μF; CF = 56nF; 31mA/ch)
EN
(2V/div)
EN
(2V/div)
0
IIN
(200mA/div)
0
IIN
(100mA/div)
VOUT
(2V/div)
0
VOUT
(2V/div)
ILED
(20mA/div)
0
ILED
(20mA/div)
0
0
0
0
Time (100μs/div)
VEN
(2V/div)
VOUT
(5V/div)
CP Current Transient
CP Current Transient
(VIN = 3.6V; 31mA to 0.5mA)
(VIN = 3.6V; 0.5mA to 31mA)
0
0
VEN
(2V/div)
VOUT
(5V/div)
0
IIN
(200mA/div)
0
0
ILED
(20mA/div)
0
IIN
(200mA/div)
ILED
(20mA/div)
Time (100μs/div)
0
0
Time (40μs/div)
Time (100μs/div)
LDO Turn On
LDO Turn On
(VIN = 3.6V; CIN = 2.2μF; CLDOA = CLDOB = 2.2μF;
VLDOA = 2.8V; VLDOB = 1.2V)
(VIN = 3.6V; CIN = 2.2μF; CLDOA = CLDOB = 2.2μF;
VLDOA = 3.0V; VLDOB = 1.8V)
EN
(2V/div)
EN
(2V/div)
0
0
IIN
(1A/div)
VLDOA
(2V/div)
VLDOB
(2V/div)
IIN
(1A/div)
VLDOA
(2V/div)
0
0
VLDOB
(2V/div)
0
Time (40μs/div)
8
0
0
0
Time (40μs/div)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012
DATA SHEET
AAT2869
Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs
Typical Characteristics
LDO Turn Off
LDO Turn Off
(VIN = 3.6V; CIN = 2.2μF; CLDOA = CLDOB = 2.2μF;
VLDOA = 2.8V; VLDOB = 1.2V)
(VIN = 3.6V; CIN = 2.2μF; CLDOA = CLDOB = 2.2μF;
VLDOA = 3.0V; VLDOB = 1.8V)
EN
(2V/div)
EN
(2V/div)
0
VLDOA
(2V/div)
VLDOA
(2V/div)
0
VLDOB
(2V/div)
VLDOB
(2V/div)
0
0
0
0
Time (1ms/div)
VIN
(AC coupled)
(50mV/div)
VOUT
(AC coupled)
(50mV/div)
IIN
(200mA/div)
ILED
(20mA/div)
Time (1ms/div)
1.5x Mode Operating Characteristics
CP Mode Transient
(VIN = 3.2V; CIN = COUT = 1μF; 31mA/ch)
(VIN = 3.6V to 4.2V; CIN = COUT = 1μF; 31mA/ch)
VIN
(2V/div)
0
0
0
VOUT
(2V/div)
0
ILED
(20mA/div)
0
0
4.2V
3.6V
0
Time (1μs/div)
Time (100μs/div)
LDO Load Transient
PSRR vs. Frequency
(VIN = 3.6V; VOUTB = 1.2V; CIN = COUTB = 2.2μF;
10mA to 150mA)
(VIN = 3.6V, VRIPPLE = 500mVPP, CIN = COUT = 2.2μF, IL = 10mA)
100
80
PSRR (dB)
IOUTB
(50mA/div)
0
VOUT
(2V/div)
0
60
40
20
0
0.1
Time (40μs/div)
1
10
100
Frequency (KHz)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012
9
DATA SHEET
AAT2869
Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs
Typical Characteristics
Dropout Characteristics
Dropout Characteristics
(VOUTA = 2.8V)
(VOUTA = 3.0V)
3.6
IOUT = 0mA
IOUT = 10mA
IOUT = 50mA
IOUT = 100mA
IOUT = 150mA
IOUT = 200mA
3.2
3.0
2.8
2.6
2.4
2.7
2.8
2.9
3.0
3.1
3.2
Output Voltage (V)
Output Voltage (V)
3.4
IOUT = 0mA
IOUT = 10mA
IOUT = 50mA
IOUT = 100mA
IOUT = 150mA
IOUT = 200mA
3.4
3.2
3.0
2.8
2.6
2.4
2.7
2.8
Input Voltage (V)
2.9
3.0
3.1
Input Voltage (V)
Fade In From CP Disable To Enable
Fade Out From CP Enable To Disable
(VIN = 3.6V; CIN = CF = 1μF; 31mA/ch)
(VIN = 3.6V; CIN = CF = 1μF; 31mA/ch)
VIN
(2V/div)
VIN
(2V/div)
0
0
VOUT
(2V/div)
VOUT
(2V/div)
0
ILED
(20mA/div)
0
ILED
(20mA/div)
0
Time (400ms/div)
10
0
Time (400ms/div)
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3.2
DATA SHEET
AAT2869
Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs
Functional Block Diagram
IN
C1+
C1C2+
C2-
Dual-mode
Charge Pump
1X/1.5X
OUTCP
4
FCAP
EN/SET
Fade Filter
Control
Logic
32-step AS2Cwire
Backlight Control
and LDO Setting
INLDO
D1
D2
D3
D4
LDOA
LDOB
GND
Functional Description
The AAT2869 is a high efficiency charge pump white LED
driver for portable applications. It can drive up to 4 white
LEDs. The two integrated LDOs can provide 1.2V, 1.5V,
1.8V, 2.8V and 3.0V output voltages in 16 combinations
with up to 150mA load capability.
The AAT2869's charge pump is a fractional charge pump
and can multiply the input voltage by 1 or 1.5 times. The
charge pump switches at a fixed frequency of 0.9MHz.
The internal mode-selection circuit automatically switches the mode between 1x and 1.5x based on the input
voltage, white LED forward voltage VF, and the programmed LED current. This mode switching maximizes
the efficiency throughout the entire LED load range.
When the input voltage is high enough, the charge pump
operates in 1x mode (no charge pump) to provide maximum efficiency. If the input voltage is too low to supply
the programmed LED current, typically when the battery
discharges and the voltage decays, the 1.5x charge
pump mode is automatically enabled. When the battery
is connected to a charger and the input voltage rises sufficiently, the device will switch back to 1x mode.
AGND
Six registers are designed for charge pump enable/disable control, LED current programming, fade-in, fadeout enable/disable, two LDOs enable/disable control and
LDO output voltage combination setting through the
AS2Cwire interface. After writing address 3, the LED current value is programmed by the EN/SET serial data
AS2Cwire interface. The AS2Cwire interface records rising
edges of the EN/SET pin and decodes them into 32 individual current level settings from 0.4mA to 31mA. To get
a visual fade in and fade out effect, a small external
capacitor is used to set LED current rising exponentially
to the programmed value and decreasing exponentially
to the programmed floor LED current level.
The AAT2869 has five registers with up to four bits each
to control LED backlighting enable/disable, LED current,
enable/disable for the two LDOs, output voltages, etc. as
shown in Table 1. Each data register can be written with
1 to 16 EN/SET rising edges. Some bits are internally
reserved and should only be written with data 0, such as
address 0, bit D0, D1 and D3, etc. in order to avoid
unexpected results. Address 0 is the default address.If
EN/SET is pulled high after a low level lasting for at least
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11
DATA SHEET
AAT2869
Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs
AS2Cwire Registers
Address
Data
Number
EN/SET Rising
Edges
Function
D3
D2
D1
D0
EN/SET Rising
Edges
0 [Default]
1
2
3
4
5
17
18
19
20
21
22
Backlight Enable
Backlight Floor Level
Backlight MSB
Backlight LSBs
LDO Enable Control
LDO Output Voltage
0
0
0
BL[3]
0
LDO[3]
BL_ENB
0
0
BL[2]
0
LDO[2]
FADE_EN
FLOOR[1]
0
BL[1]
LDOA_EN
LDO[1]
FADE_IN
FLOOR[2]
BL[4]
BL[0]
LDOB_EN
LDO[0]
1~8
1~4
1 or 2
1 ~ 16
1~4
1 ~ 16
Table 1: AAT2869 AS2Cwire Registers.
500μs tOFF time, data 0 is written to address 0 and LED
backlighting is enabled with default 20mA LED current
each.
Address 0 – Backlight Enable and Fade Enable
The BL_ENB bit of address register 0 is adopted to
enable or disable the white LED backlighting. 0 enables
backlighting; 1 disables backlighting. The FADE_EN and
FADE_IN bits are adopted to enable/disable the fade-in/
fade-out function. The other bits of the register should
be written with data 0.
For example, to enable a 20mA fade-in visual effect,
send 4 data EN/SET rising edges after an EN/SET low
lasting for tLAT or send 4 data EN/SET rising edges after
17 address EN/SET rising edges.
Address 1 – Backlight Fade Floor Settings
When the fade-out function is enabled, the LED current
decreases to the programmed floor level instead of
decreasing to zero. The other bits of the register should
be written with data 0.
Addresses 2 and 3 –
LED Current Level Settings
The LED current level is set via the AS2Cwire interface in
a linear scale by 32 codes where the LED current of each
higher code is higher than the lower one, as shown in
Table 4. In this manner, the LED current decreases linearly with each decreasing code.
Description
BL_ENB
FADE_EN
FADE_IN
EN/SET Rising Edges
Backlight on [default]
Backlight on
Backlight on, Fade enabled: fade out
Backlight on, Fade enabled: fade in
Backlight off
0
0
0
0
1
0
0
1
1
0/1
0
1
0
1
0/1
1
2
3
4
5~8
Table 2: AS2Cwire Register Address 0.
Description
FLOOR[1]
FLOOR[2]
Floor 0.5mA [default]
Floor 1.0mA
Floor 2.0mA
Floor 3.0mA
0
0
1
1
0
1
0
1
Table 3: AS2Cwire Register Address 1.
12
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DATA SHEET
AAT2869
Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs
LED
Current
Codes
Address 2
Address 3
BL4
BL3
BL2
BL1
BL0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
21
1
0
1
0
0
22
23
24
25
26
27
28
29
30
31
32
1
1
1
1
1
1
1
1
1
1
1
0
0
0
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
1
1
0
0
1
1
0
0
1
1
1
0
1
0
1
0
1
0
1
0
1
LED
Current
(mA)
0.4
0.9
1.9
2.9
3.9
4.9
6.0
7.0
8.0
9.0
10.0
11.0
12.0
13.0
14.0
15.0
16.0
17.0
18.0
19.0
20.0
[default]
21.0
22.0
23.0
24.0
25.0
26.0
27.0
28.0
29.0
30.0
31.0
Address 4 – LDO Enable Control
The AAT2869 includes two low dropout (LDO) linear
regulators. These regulators are powered from the battery and produce a fixed output voltage which is set using
the AS2Cwire serial interface. AS2Cwire address register
4 turns the two LDOs on/off through the AS2Cwire serial
interface. An internal resistor is used to discharge the
LDO output voltage when the LDO is disabled.
Data
Description
LDOA Off,
LDOB Off
[Default]
LDOA Off,
LDOB On
LDOA On,
LDOB Off
LDOA On,
LDOB On
LDOA_EN
LDOB_EN
EN/SET
Rising Edges
0
0
1
0
1
2
1
0
3
1
1
4
Table 5: AS2Cwire Register Address 4.
Address 5 - LDO Voltage Output Setting
Register address 5 is used to set the LDOA and LDOB
output voltage levels. Sixteen combinations of the two
LDOs can be programmed by the 4 bits of the register.
LDOA can be set to one of four levels: 1.5V, 1.8V, 2.8V, or
3.0V. LDOB can be set to one of four levels: 1.2V, 1.5V,
1.8V, or 2.8V. The LDO regulators require only a small
2.2μF ceramic output capacitor for stable operation. If
improved load transient response is required, larger-valued capacitors can be used without stability degradation.
Table 4: AS2Cwire Register Addresses 2 and 31.
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13
DATA SHEET
AAT2869
Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs
Data
Description
LDO[3]
LDO[2]
LDO[1]
LDO[0]
EN/SET Rising Edges
LDOA = 3.0V, LDOB = 2.8V
LDOA = 3.0V, LDOB = 1.8V
LDOA = 3.0V, LDOB = 1.5V
LDOA = 3.0V, LDOB = 1.2V
LDOA = 2.8V, LDOB = 2.8V
LDOA = 2.8V, LDOB = 1.8V
LDOA = 2.8V, LDOB = 1.5V
LDOA = 2.8V, LDOB = 1.2V
LDOA = 1.8V, LDOB = 2.8V [default]
LDOA = 1.8V, LDOB = 1.8V
LDOA = 1.8V, LDOB = 1.5V
LDOA = 1.8V, LDOB = 1.2V
LDOA = 1.5V, LDOB = 2.8V
LDOA = 1.5V, LDOB = 1.8V
LDOA = 1.5V, LDOB = 1.5V
LDOA = 1.5V, LDOB = 1.2V
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Table 6: AS2Cwire Register Address 5 LDOA and LDOB Output Voltage Settings.
AS2Cwire EN/SET Interface
The AAT2869 is dynamically programmable using the
AS2Cwire single-wire interface. AS2Cwire records rising
edges detected at the EN/SET pin to address and load
the data registers. The timing diagram in Figure 1 shows
the typical transmission protocol.
The AAT2869 latches address or data after the EN/SET
input has been held high for time tLAT (500μs) through the
AS2Cwire interface. Address and data are differentiated by
the number of EN/SET rising edges. An address has from
17 to 22 EN/SET rising edges; data has from 1 to 16 EN/
SET rising edges. A typical AS2Cwire interface write protocol is a burst of EN/SET rising edges identifying a particular address, followed by a pause with EN/SET held
high for the tLAT timeout period, then a burst of rising
edges signifying data, and another tLAT timeout after the
data has been sent. Once an address is set, multiple
writes to that address are allowed since the address is not
reset after each write. Address edges are needed when
changing the address, or writing to an address other than
the default after shutdown. Address 0 is the default
address after shutdown. If the part is enabled with only
14
one rising edge after shutdown, then Address 0 will be
programmed and LED backlight channels BL1-BL4 will be
enabled to the default setting of 20mA each.
When EN/SET is held low for a time longer than tOFF
(500μs), the AAT2869 enters shutdown mode with the
charge pump and both LDOs all turning off and draws
less than 1μA of current from IN. At shutdown, the data
and address registers are reset to 0.
Short Circuit and
Over-Temperature Protection
The AAT2869 integrates short circuit protection to limit
the input current in case of the charge pump output or
the two LDO outputs are shorted to ground by fault. The
backlight and the two LDOs will recover to normal operation once the fault is removed.
The AAT2869 also includes over-temperature protection
circuitry. When the junction temperature is too high, the
over-temperature protection circuitry is active and the IC
enters standby mode, turning off the LED current and
LDO outputs. When the fault is removed, the LED backlighting and the LDO outputs all recover.
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DATA SHEET
AAT2869
Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs
Address
TLO
Data
TLAT
T LAT
THI
EN/SET
1
2
19
1
20
2
n ≤ 16
Address
0
3
Data Reg
0
n
Figure 1: AS2Cwire Timing Diagram.
Application Information
mine which LED current code is programmed. The
address 2 BL4 default value is 0 after one EN/SET rising
edge.
LED Selection
The AAT2869 is designed to drive high intensity white
flash LEDs with forward voltages up to 4.4V. Though
AAT2869 switches the charge pump mode 1x and 1.5x
mode automatically to maintain the continuous LED current accuracy, to obtain higher efficiency lower VF white
LEDs should be selected.
Maximum LED Current Setting
ILED (V)
32 maximum LED current codes from 0.4mA to 31mA can
be set by two registers using addresses 2 and 3 through
the EN/SET AS2Cwire interface as shown in Figure 2. To
obtain linear LED current change, the AAT2869 will not
change the LED current when only address 2 is written.
The control circuit only loads data to the address 2 and
address 3 registers after address 3 is written to deter-
Codes 1 to 16 with LED current from 0.4mA to 15mA can
be set after sending 20 rising edges to address 3 and
sending data with 1 to 16 rising edges after tLAT. Codes
17 to 32 with LED current from 16mA to 31mA can be
obtained after writing both address 2 and address 3.
This operation is performed using the following steps:
1. Select address 2 by sending 19 rising edges to EN/SET
and holding high for tLAT;
2. Send data 1 to set DL4 by sending 2 rising edges and
holding high for tLAT;
3. Select address 3 by sending 20 rising edges on EN/
SET and holding high for tLAT;
4. Send data 15 to enable LED current code 32 setting
by sending 16 rising edges on EN/SET and holding
high for tLAT.
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
1
2
3
4
5
6 7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
LED Current Code
Figure 2: AAT2869 Total 32 LED Current Codes vs. LED Current.
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15
DATA SHEET
AAT2869
Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs
Fade In and Fade Out
AAT2869 adopts several linear current change segments
to approximate the exponential LED current change to
get a fashion fade-in visual effect. The fade-in time is
mainly determined by the external capacitor CF and the
charge current. The following formula can be used to
estimate how much capacitance is suitable for an expected fade-in time.
tFADE-IN
CF (μF) = 48.7 · I
LED
CF (μF)
ILED (mA)
tFADE-IN (s)
0.56
0.56
0.56
0.56
0.56
1
1
1
1
1
10
15
20
25
30
10
15
20
25
30
0.273
0.409
0.545
0.682
0.818
0.5
0.7
1.0
1.2
1.5
Table 7: Fade-in Time Examples
at Different CF and LED Current Settings.
Fade-out time is determined by the discharging time of
the CF through an internal 200kΩ resistor R. For example, 1μF CF generates 800ms fade-out time; 560nF CF
generates 450ms fade-out time.
tFADE-OUT (s) = 4 · RCF = 0.8 · CF
Charge Pump Efficiency
1x Mode Efficiency
The AAT2869's 1x mode is operational at all times and
functions alone to enhance device power conversion efficiency when VIN is higher than the voltage across the
load. When in 1x mode, voltage conversion efficiency is
defined as output power divided by input power.
16
η=
V
POUT VF · IOUT
=
≈ F
PIN
VIN · IIN
VIN
-or-
η(%) = 100
VF
VIN
1.5x Charge Pump Mode Efficiency
For example, for a 1 second fade-in time at 20mA LED
current each, a 1μF CF capacitor can be used. Table 7
shows the fade-in time with CF of 560nF and 1μF CF at
different LED current settings.
η=
The ideal efficiency (η) in 1X charge pump mode can be
expressed as:
The AAT2869 contains a fractional charge pump which
will boost the input supply voltage in the event where VIN
is less than the voltage required to supply the output.
The efficiency (η) can be simply defined as a linear voltage regulator with an effective output voltage that is
equal to one and one half times the input voltage.
Efficiency (η) for an ideal 1.5x charge pump can be calculated by the following equation:
η=
VF · IOUT
VF
POUT VF · IOUT
=
=
≈
VIN · IIN
VIN · 1.5 · IOUT 1.5 · VIN
PIN
-or-
η(%) = 100
VOUT
1.5 · VIN
Capacitor Selection
The AAT2869 requires seven capacitors in its typical
application: CIN, COUT, C1, C2, CFLT and CLOA, CLOB. Among
them, CIN, C1, C2 and COUT are required for 1.5x mode
charge pump operation. 1μF surface-mount multi-layer
ceramic capacitors with low (less than 100mΩ) equivalent series resistance (ESR) are recommended. Though
ESR of the capacitors will not affect the ability of the
capacitor to store energy, it has a large effect on performance such as equivalent output resistance, efficiency,
and output voltage ripple of the charge pump. Tantalum
and aluminum electrolytic capacitors are not recommended due to their high ESR. A value of 2.2μF or above
is required for the LDOA and LDOB output capacitors for
proper load voltage regulation and stable operation.
Some recommended capacitors are listed in Table 6.
POUT
PIN
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DATA SHEET
AAT2869
Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs
Manufacturer
Murata
TDK
Part Number
Value (μF)
Voltage
Temp. Co.
ESR (mΩ) at 1MHz
Case
GRM188R61C105KA93
GRM185R60J105KE21
GRM188R61A225KE34
C1608X5R1C105K
C1608X5R0J225K
1
1
2.2
1
2.2
16
6.3
10
16
6.3
X5R
X5R
X5R
X5R
X5R
18
16
12
5.5
3.3
0603
0603
0603
0603
0603
Table 6: AAT2869 Recommended Capacitors.
Additional Applications
For most applications, ceramic capacitors with X5R temperature characteristic are preferred for AAT2869 application. These capacitors have good capacitor tolerance
over wide temperature (X5R: ±15% over -55°C to
+85°C). Capacitors with Y5V or Z5U temperature characteristic are generally not recommended for AAT2869.
They have wide capacitance tolerance over special temperature (Y5V: +22%, -82% over -30°C to +85°C, Z5U:
+22%, -56% over +10°C to +85°C).
The current sinks of the AAT2869 can be combined to
drive higher current levels through a single LED. As an
example, Figure 3 shows the AAT2869 driving a single
white LED with up to 124mA by connecting D1-D4
together to the LED cathode.
Printed Circuit Board
Layout Recommendations
Careful selection of the four external capacitors CIN, C1,
C2, COUT is important because they will affect turn on
time, output ripple and transient performance. Optimum
performance will be obtained when low ESR (<100mΩ)
ceramic capacitors are used. In general, low ESR may be
defined as less than 100mΩ. A capacitor value of 1uF for
all four capacitors is a good starting point when choosing
capacitors. If the LED current sinks are only programmed
for light current levels, then the capacitor size may be
decreased.
C1
1μF
VIN
2.7~5.5V
CIN
2.2μF
AS2Cwire
CF
1μF
C1+
When designing a PCB for the AAT2869, the key requirements are:
1.
2.
3.
C2+
C1C2IN
OUTCP
INLDO
AAT2869
EN/SET
FCAP
GND
D1
D2
D3
D4
LDOA
LDOB
AGND
Place the flying capacitors C1 and C2 as close to the
chip as possible; otherwise 1.5x mode performance
will be compromised.
Place the input and output decoupling capacitors as
close to the chip as possible to reduce switching
noise and output ripple.
Connect the exposed pad to GND plane for optimal
power dissipation.
C2
1μF
COUT
1μF
D1
Up to
124mA
LDOA
LDOB
CLDOB
2.2μF
CLDOA
2.2μF
Figure 3: Higher Current, Single LED Application.
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17
DATA SHEET
AAT2869
Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs
Schematic and Layout
U1
AAT2869
C1
1μF
J1
1
18
7
6
DC+
C1+
C1IN
INLDO
C2+
C2OUTCP
16
15
17
C2
1μF
VOUT
COUT
1μF
V_LDO
CIN
2.2μF
DC-
8
V _MCU
GND
14
4
AAT2869
White LED
Driver
D1
FCAP
D1
D2
D3
D4
LDOA
AGND EP
LDOB
CF
1μF
R8
50k
5
R2
0
R3
0
R4
0
D3
D2
D4
EN/SET
GND
9
R1
0
10
11
12
13
3
LDOA
2
LDOB
CLDOB
2.2μF
CLDOA
2.2μF
EN/SET
R10 R11 R12
1k 1k 1k
SELECT
U2
1
2
3
4
VDD
GP5
GP4
GP3
PIC12F675
VSS
GP0
GP1
GP2
C3
0.1uF
8
7
6
5
R9
1k
LED2
Red
R6
1k
DETAIL
LED1
Green
SEND
AS2Cwire
Microcontroller
Figure 4: AAT2869 Evaluation Board Schematic.
Figure 5: AAT2869 Evaluation Board
Top Side Layout.
18
Figure 6: AAT2869 Evaluation Board
Bottom Side Layout.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012
DATA SHEET
AAT2869
Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs
Component
Part Number
U1
AAT2869IDT
U2
R1, R2, R3, R4
R8
R6, R9, R10, R11, R12
C1, C2, COUT, CF
CLA, CLB, CIN
C3
D1, D2, D3, D4
LED1
LED2
CYCLE, UP, DOWN
PIC12F675
RC0603FR-070RL
RC0603FR-0749K9L
RC0603FR-071KL
GRM188R71C105K
GRM188R61A225K
GRM188R71C104K
RS-0805UW
0805KGCT
0805KRCT
6*6*5
Description
Manufacturer
Fade-in/Fade-out 4 Channel 1X/1.5X Charge Pump for
White LEDs with Dual LDOs
8-Pin Flash-Based 8-Bit CMOS Microcontroller
Res 0Ω 1/10W 1% 0603 SMD
Res 49.9KΩ 1/10W 1% 0603 SMD
Res 1KΩ 1/10W 1% 0603 SMD
Cap Ceramic 1μF 0603 X7R 16V 10%
Cap Ceramic 2.2μF 0603 X5R 10V 10%
Cap Ceramic 0.1μF 0603 X7R 16V 10%
20mA White LED 0805
Green LED 0805
Red LED 0805
12V 50mA Pushbutton
Skyworks
Microchip
Yageo
Murata
Realstar
HB
HB
E-LT
Table 8: AAT2869IDT-DB1 Evaluation Board Bill of Materials.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012
19
DATA SHEET
AAT2869
Fade-In/Fade-Out Four-Channel Backlight Driver with Dual LDOs
Ordering Information
Package
Marking1
Part Number (Tape and Reel)2
TQFN3.0x2.2-18L
F3XYY
AAT2869IDT-T1
Skyworks Green™ products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to Skyworks
Definition of Green™, document number
SQ04-0074.
Package Information
TQFN3.0x2.2-183
Index Area
Pin 1 Indicator
(optional)
0.40 BSC
0.20 ± 0.05
0.203 REF
0.75 ± 0.05
3.00 ± 0.05
1.90 ± 0.05
0.30 ± 0.05
0.05 ± 0.05
Side View
2.20 ± 0.05
Top View
1.10 ± 0.05
Bottom View
All dimensions in millimeters.
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
3. The leadless package family, which includes QFN, TQFN, DFN, TDFN and STDFN, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing
process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection.
Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved.
Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a
service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to update the materials or information and shall have no
responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes.
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THE USE OF THE MATERIALS OR INFORMATION, WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury, death, physical or environmental damage. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any damages resulting from such improper
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Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of products outside of published parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product
design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters.
Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for
identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference.
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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202073A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 15, 2012