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Datasheet
AS1390A, AS1390B
High Power Boost Controller and Buck Converter for LED Backlight
1 General Description
The AS1390A, AS1390B is a high-power, constant-frequency boost controller with an integrated buck converter. The AS1390A can be used for the boost converter in TV sets which are optimized for 2D and 3D mode. AS1390B is designed for single mode operation.
The continuous conduction mode of the AS1390 provides superior bandwith and transient response. The two output voltages for the boost controller (2D and 3D mode) can be programmed with an external resistor divider.
The buck converter is optimized for suppling a µP with 5V.
The AS1390A is available in a 20-Pin QFN (4x4mm) package, the AS1390B comes in a 16-pin SOIC package.
2 Key Features
High Efficiency: Up to 95% Supply Voltage Range: 10V to 30V Boost Output Current: up to 3A Continuous Conduction Mode Undervoltage Lockout with hysteresis Overvoltage, Overcurrent and Overtemperature Protection Low Dropout Operation: 90% Duty Cycle Buck always ON, Boost with enable PIN Packages: - 20-Pin QFN (4x4mm) - 16-pin SOIC
Figure 1. AS1390A - Typical Application
3 Applications
The device is ideal for LED backlighting for LCD - TV sets and monitors.
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Datasheet - Applications
Figure 2. AS1390B - Typical Application
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Datasheet - Pin Assignments
4 Pin Assignments
Figure 3. Pin Assignments (Top View)
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4.1 Pin Descriptions
Table 1. Pin Descriptions
Pin Number AS1390A AS1390B
13 5 3 10 6
12 8 19 6 14 1, 16 17 4 5
11 4 15 2 7
13 9 10 -
Pin Name
VDDH UVLO COMP_2D COMP_3D VBIAS VDDL VDDM FB_2D FB_3D GATE SENSE_2D SENSE_3D SENSE_GND
18
LX
2 9 FB_BUCK 20 7 VDDHP 16 3 PGND 11 14 AGND
12 15 EN_BOOST
13 - MODE_3D - Exposed Pad
Pin Typ
Description
P Supply Voltage A I/O Undervoltage Lockout A I/O Compensation Network 2D. default A I/O Compensation Network 3D A I/O High Side Regulator Output. Connect this pin to the Supply rail via a capacitor. A I/O Internal Regulator Output A I/O Drive Voltage Regulator Output A I/O FB Input 2D. default A I/O FB Input 3D A I/O Gate Driver Output A I/O Current Sense Input 2D. default A I/O Current Sense Input 3D A I/O Current Sense Input GND. (only for AS1390A)
Inductor Connector. Connect an inductor from LX to the output of the buck A I/O converter A I/O Feedback Buck Pin. Connect this pin to the output of the buck converter
P Supply for DCDC Buck-Converter P Power Ground P Analog Ground
Enable. Enables the Boost-Controller. D IN 1 = Normal operation;
0 = Shutdown; Selection for 3D Mode. (only for AS1390A) D IN 1 = 3D; 0 = 2D; Exposed Pad. This pad is not connected internally. Can be left floating or connect to n.c. GND to achieve an optimal thermal performance.
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Datasheet - Absolute Maximum Ratings
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 2 may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in Electrical Characteristics on page 5 is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Table 2. Absolute Maximum Ratings
Parameter Electrical Parameters
Min Max Units
Notes
VDDH to AGND
40 V
VDDL to AGND
5.0 V
VDDM to AGND
20 V
VBIAS to AGND
VDDH - 5.0 VDDH + 0.3
V
PGND to AGND
-0.3 +0.3 V
EN_BOOST, FB_2D, FB_3D, FB_BUCK AGND - 0.3 VDD + 0.3
V
Input Current (latch-up immunity) Electrostatic Discharge
Human Body Model @ VDDH, VDDM, LX, VBIAS, GATE, VDDHP
Human Body Model all other pins Temperature Ranges and Storage Conditions
Junction Temperature (TJ-MAX) Storage Temperature Range
-100 -65
100 mA
4 kV 2 kV
+150 ºC +150 ºC
Norm: JEDEC 78 Norm: MIL 883 E method 3015
Package Body Temperature
The reflow peak soldering temperature (body temperature) specified is in accordance with IPC/ JEDEC J-STD-020 “Moisture/Reflow Sensitivity +260 ºC Classification for Non-Hermetic Solid State
Surface Mount Devices”.
The lead finish for Pb-free leaded packages is matte tin (100% Sn).
Humidity non-condensing
5 85 %
Moisture Sensitive Level
1 3
Represents a max. floor life time of unlimited for 20-Pin QFN (4x4mm)
Represents a max. floor life time of 168h for 16-pin SOIC
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Datasheet - Electrical Characteristics
6 Electrical Characteristics
VDDH = 24V, EN_BOOST = 5V, unless otherwise noted. Typical values are at TA=25°C. All limits are guaranteed. The parameters with min and max values ar.