Charge Pump. AAT3123 Datasheet

AAT3123 Pump. Datasheet pdf. Equivalent

AAT3123 Datasheet
Recommendation AAT3123 Datasheet
Part AAT3123
Description High Efficiency 1X/1.5X Fractional Charge Pump
Feature AAT3123; AAT3123/23A/24 High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications General De.
Manufacture AAT
Datasheet
Download AAT3123 Datasheet




AAT AAT3123
AAT3123/23A/24
High Efficiency 1X/1.5X Fractional Charge
Pump for White LED Applications
General Description
Features
ChargePump
The AAT3123/23A/24 is a low noise, constant fre-
quency charge pump DC/DC converter that uses a
• VIN Range: 2.7V to 5.5V
• Dual Mode 1X and 1.5X Charge Pump for
dual mode load switch (1X) and fractional (1.5X)
Maximum Efficiency
conversion to maximize efficiency for white LED
applications. The device can be used to produce
• Drives Low-VF and High-VF Type LEDs
• Up to Six 20mA Outputs (AAT3124)
current levels up to 20mA to drive up to six LEDs
• Up to Four 20mA Outputs (AAT3123/23A)
from a 2.7V to 5.5V input. Outputs may be operat-
• 32-Position Logarithmic Scale with Digital
ed individually or paralleled for driving higher-cur-
Control
rent LEDs. A low external parts count (two 1µF fly-
• Simple Serial Control (S2Cwire) Interface
ing capacitors and two small 1µF capacitors at VIN
and OUT) make the AAT3123/23A/24 ideally suited
• Low Noise Constant Frequency Operation
• 1MHz Switching Frequency
for small battery-powered applications.
• Small Application Circuit
AnalogicTech’s 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 system to protect the device
in the event of a short-circuit condition at the output
pin. Built-in soft-start circuitry prevents excessive
• 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 Package (AAT3124)
inrush current during start-up. A high charge pump
switching frequency enables the use of very small
external capacitors. A low-current shutdown featurewww.DataSheet4U.com
disconnects the load from VIN and reduces quies-
Applications
cent current to less than 1µA. The device also inte-
grates a test current/auto-disable feature for each
• Color (RGB) Lighting
channel. The AAT3123/23A is available in a very
• Programmable Current Source
small, Pb-free 12-pin TSOPJW package. The six
• White LED Backlighting
output AAT3124 is available in a Pb-free 16-pin
• White Photo Flash for DSCs
4x4mm QFN package.
Typical Application
VBATTERY
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
3123.2005.12.1.4
1



AAT AAT3123
AAT3123/23A/24
High Efficiency 1X/1.5X Fractional Charge
Pump for White LED Applications
Pin Descriptions
Pin #
AAT3123/23A
(TSOPJW-12)
1
AAT3124
(QFN44-16)
10
29
37
46
55
64
71
8 16
9 15
10 14
11 12
12 11
2
3
8, 13
EP
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
between 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
between C1+ and C1-.
Current source output #4.
Current source output #3.
Current source output #2.
Current source output #1.
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.
Current source output #6.
No connection.
Exposed paddle (bottom); connect to GND directly beneath
package.
Pin Configuration
TSOPJW-12
(Top View)
QFN44-16
(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
2
D2 1
D5 2
D6 3
D3 4
AAT3124
12 GND
11 C2-
10 C2+
9 OUT
3123.2005.12.1.4



AAT AAT3123
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
θJA
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 condi-
tions 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.
3123.2005.12.1.4
3







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