Charge Pump. AAT3123A Datasheet

AAT3123A Pump. Datasheet pdf. Equivalent

AAT3123A Datasheet
Recommendation AAT3123A Datasheet
Part AAT3123A
Description High Efficiency 1X/1.5X Fractional Charge Pump
Feature AAT3123A; DATA SHEET AAT3123/23A/24 High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications .
Manufacture Skyworks Solutions
Datasheet
Download AAT3123A Datasheet




Skyworks Solutions AAT3123A
DATA SHEET
AAT3123/23A/24
High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications
General Description
The AAT3123/23A/24 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
device can be used to produce current levels up to 20mA
to drive up to six LEDs from a 2.7V to 5.5V input.
Outputs may be operated individually or paralleled for
driving higher-current LEDs. A low external parts count
(two 1μF flying capacitors and two small 1μF capacitors
at VIN and OUT) make the AAT3123/23A/24 ideally suited
for small battery-powered applications.
Skyworks' Simple Serial Control (S2Cwire™) interface is
used to enable, disable, and set the LED drive current
with a 32-level logarithmic scale LED brightness control.
The AAT3123/23A/24 has a thermal management sys-
tem to protect the device in the event of a short-circuit
condition at the output pin. Built-in soft-start circuitry
prevents excessive inrush current during start-up. A high
charge pump switching frequency enables the use of
very small external capacitors. A low-current shutdown
feature disconnects the load from VIN and reduces quies-
cent current to less than 1μA. The device also integrates
a test current/auto-disable feature for each channel. The
AAT3123/23A is available in a very small, Pb-free 12-pin
TSOPJW package. The six output AAT3124 is available in
the Pb-free 16-pin 4x4mm QFN and 14-pin TSOPJW
packages.
Features
• VIN Range: 2.7V to 5.5V
• Dual Mode 1X and 1.5X Charge Pump for Maximum
Efficiency
• Drives Low-VF and High-VF Type LEDs
• Up to Six 20mA Outputs (AAT3124)
• Up to Four 20mA Outputs (AAT3123/23A)
• 32-Position Logarithmic Scale with Digital Control
• Simple Serial Control (S2Cwire) Interface
• Low Noise Constant Frequency Operation
• 1MHz Switching Frequency
• Small Application Circuit
• Regulated Output Current
• Automatic Soft Start
• No Inductors
• IQ <1μA in Shutdown
• Temperature Range: -40°C to +85°C
• 12-Pin TSOPJW Package (AAT3123/23A)
• 16-Pin 4x4mm QFN and 14-Pin TSOPJW Packages
(AAT3124)
Applications
• Color (RGB) Lighting
• Programmable Current Source
• White LED Backlighting
• White Photo Flash for DSCs
Typical Application
VIN C1+
VBATTERY
CIN COUT
1μF 1μF
EN/SET
VOUT
C1-
C2+
AAT3123
AAT3123A
C2-
EN/SET
GND
D1
D2
D3
D4
C1
1μF
C2
1μF
VBATTERY
D4 D3 D2 D1
VIN C1+
CIN COUT
1μF 1μF
EN/SET
VOUT
C1-
C2+
AAT3124
C2-
EN/SET
GND
D1
D2
D3
D4
D5
D6
C1
1μF
C2
1μF
D6 D5 D4 D3 D2 D1
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202135B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 26, 2013
1



Skyworks Solutions AAT3123A
DATA SHEET
AAT3123/23A/24
High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications
Pin Descriptions
Pin #
AAT3123/23A
(TSOPJW-12)
1
2
3
4
5
6
7
8
9
10
11
12
AAT3124
(QFN44-16)
10
9
7
6
5
4
1
16
15
14
12
11
2
3
8, 13
EP
AAT3124
(TSOPJW-14)
8
9
10
11
12
13
2
3
4
5
6
7
1
14
Symbol
C2+
OUT
C1-
C1+
D4
D3
D2
D1
EN/SET
IN
GND
C2-
D5
D6
N/C
Function
Flying capacitor 2 positive terminal. Connect a 1μF capacitor be-
tween C2+ and C2-.
Charge pump output. Requires 1μF capacitor connected between
this pin and ground.
Flying capacitor 1 negative terminal.
Flying capacitor 1 positive terminal. Connect a 1μF capacitor be-
tween C1+ and C1-.
Current source output #4. If unused, this pin should be left oating.
Current source output #3. If unused, this pin should be left oating.
Current source output #2. If unused, this pin should be left oating.
Current source output #1. Required reference current source. Do
not leave this pin oating.
Control pin using S2Cwire serial interface.
Input power supply. Requires 1μF capacitor connected between this
pin and ground.
Ground.
Flying capacitor 2 negative terminal.
Current source output #5. Required reference current source. Do
not leave this pin oating.
Current source output #6. If unused, this pin should be left oating.
No connection.
Exposed paddle (bottom); connect to GND directly beneath package.
Pin Configuration
TSOPJW-12
(Top View)
QFN44-16
(Top View)
TSOPJW-14
(Top View)
C2+
OUT
C1-
C1+
D4
D3
1 12
2 11
3 AAT3123 10
4 AAT3123A 9
58
67
C2-
GND
IN
EN/SET
D1
D2
D2 1
D5 2
D6 3
D3 4
AAT3124
12 GND
11 C2-
10 C2+
9 OUT
D5 1
14 D6
D2 2
13 D3
D1 3
12 D4
EN/SET 4 AAT3124 11 C1+
IN 5
10 C1-
GND 6
9 OUT
C2- 7
8 C2+
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
2 202135B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 26, 2013



Skyworks Solutions AAT3123A
DATA SHEET
AAT3123/23A/24
High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications
Absolute Maximum Ratings1
Symbol
VIN
VOUT
FB, VEN/SET
VEN/SET(MAX)
IOUT2
TJ
Description
Input Voltage
Charge Pump Output
FB or EN/SET to GND Voltage
Maximum EN/SET to Input Voltage
Maximum DC Output Current
Operating Junction Temperature Range
Value
-0.3 to 6
-0.3 to 6
-0.3 to 6
0.3
150
-40 to 150
Units
V
V
V
V
mA
°C
Thermal Information3
Symbol
JA
PD
Description
Thermal Resistance
Maximum Power Dissipation
QFN44-16
TSOPJW-12
QFN44-164
TSOPJW-125
Value
50
160
2.0
0.625
Units
°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.
4. Derate 20mW/°C above 25°C.
5. Derate 6.25mW/°C above 25°C.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202135B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • February 26, 2013
3







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