AAT1236IRN-T1 Advanced Analogic Technologies, Inc., AAT1236IRN-T1 Datasheet

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AAT1236IRN-T1

Manufacturer Part Number
AAT1236IRN-T1
Description
Manufacturer
Advanced Analogic Technologies, Inc.
Datasheet

Specifications of AAT1236IRN-T1

Date_code
06+
Packing_info
TDFN34-16

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AAT1236IRN-T1
Manufacturer:
ANALOGIC
Quantity:
1 000
General Description
The AAT1239-1 is a high frequency, high efficiency con-
stant current boost converter capable of driving up to
ten (10) series-connected white LEDs or 40V. It is an
ideal power solutions for backlight applications with up
to ten white LEDs in series. The input voltage is 2.7V to
5.5V for single-cell lithium-ion/polymer (Li-ion) based
portable devices.
The LED current is digitally controlled across a 6x oper-
ating range using AnalogicTech’s Simple Serial Control™
(S
crete current steps provides high resolution, low noise,
flicker-free, constant LED outputs. In programming
AAT1239 operation, LED brightness increases based on
the data applied at the EN/SET pin. The SEL logic pin
changes the feedback voltage between two program-
mable ranges.
The AAT1239-1 features a high current limit and fast,
stable transitions for stepped or pulsed current applica-
tions. The high switching frequency (up to 2MHz) pro-
vides fast response and allows the use of ultra-small
external components, including chip inductors and
capacitors. Fully integrated control circuitry simplifies
design and reduces total solution size. The AAT1239-1
offers a true load disconnect feature which isolates the
load from the power source while in the OFF or disabled
state. This eliminates leakage current, making the devic-
es ideally suited for battery-powered applications.
The AAT1239-1 is available in the Pb-free, thermally-
enhanced 12-pin TSOPJW package.
Typical Application
SwitchReg
1239-1.2008.10.1.2
2
Cwire™) interface. Programmability across 26 dis-
TM
V
IN
= 2.7V to 4.2V
Feedback Voltage
Select
Enable/Set
Li-Ion:
2.2μF
C1
EN/SET
PVIN
SEL
VIN
PGND
AAT1239-1
w w w . a n a l o g i c t e c h . c o m
AGND
OVP
LIN
SW
FB
40V Step-Up Converter for 4 to 10 White LEDs
2.2μH
L1
20mA
I
LED
Features
• Input Voltage Range: 2.7V to 5.5V
• Maximum Continuous Output 40V @ 30mA
• Drives up to 10 LEDs in Series
• Digital Control with S
• Up to 85% Efficiency
• Up to 2MHz Switching Frequency Allows Small External
• Hysteretic Control
• Integrated Soft Start with No External Capacitor
• True Load Disconnect Guarantees <1.0μA Shutdown
• Selectable Feedback Voltage Ranges for High Resolution
• Short-Circuit, Over-Voltage, and Over-Temperature
• 12-Pin TSOPJW Package
• -40°C to +85°C Temperature Range
Applications
• Color Display Backlight
• Digital Still Cameras (DSCs)
• Digital Photo Frames
• PDAs and Notebook PCs
• White LED Drivers
SS16L or equivalent
R1 (R
30
Chip Inductor and Capacitors
Current
Control of Load Current
Protection
BALLAST
.1
DS1
374k
12k
Constant LED Current with 3.5% Accuracy Over
Temperature and Input Voltage Range
26 Discrete Steps
No PWM Control Required
No Additional Circuitry
No External Compensation Components
Excellent Load Transient Response
High Efficiency at Light Loads
R2
R3
)
2.2μF
M673
C2
OSRAM LW M678
PRODUCT DATASHEET
or equivalent
White LEDs
2
Cwire Single Wire Interface
AAT1239-1
1

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