AS1390A, AS1390B
H i g h P o w e r B o o s t C o n t r o l l e r a n d B uc k C o n v e r t e r f or L E D B a c k l i g h t
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
bandwidth 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
3 Applications
Figure 1. AS1390A - Typical Application
The device is ideal for LED backlighting for LCD - TV sets and
monitors.
www.ams.com/Power-Management/AS1390
Revision 1.7
1 - 20
AS1390A, AS1390B
Datasheet - A p p l i c a t i o n s
Figure 2. AS1390B - Typical Application
www.ams.com/Power-Management/AS1390
Revision 1.7
2 - 20
AS1390A, AS1390B
Datasheet - P i n A s s i g n m e n t s
4 Pin Assignments
Figure 3. Pin Assignments (Top View)
4.1 Pin Descriptions
Table 1. Pin Descriptions
Pin Number
AS1390A
13
3
6
8
19
14
17
5
4
15
7
9
10
AS1390B
5
10
12
6
1, 16
4
11
2
13
-
Pin Name
VDDH
UVLO
COMP_2D
COMP_3D
VBIAS
VDDL
VDDM
FB_2D
FB_3D
GATE
SENSE_2D
SENSE_3D
SENSE_GND
Pin Type
P
A I/O
A I/O
A I/O
A I/O
A I/O
A I/O
A I/O
A I/O
A I/O
A I/O
A I/O
A I/O
Supply Voltage
Undervoltage Lockout
Compensation Network 2D.
default
Compensation Network 3D
High Side Regulator Output.
Connect this pin to the Supply rail via a capacitor.
Internal Regulator Output
Drive Voltage Regulator Output
FB Input 2D.
default
FB Input 3D
Gate Driver Output
Current Sense Input 2D.
default
Current Sense Input 3D
Current Sense Input GND.
(only for AS1390A)
Description
www.ams.com/Power-Management/AS1390
Revision 1.7
3 - 20
AS1390A, AS1390B
Datasheet - P i n A s s i g n m e n t s
Table 1. Pin Descriptions
Pin Number
AS1390A
1
2
20
16
11
12
AS1390B
8
9
7
3
14
15
Pin Name
LX
FB_BUCK
VDDHP
PGND
AGND
EN_BOOST
Pin Type
A I/O
A I/O
P
P
P
D IN
Description
Inductor Connector.
Connect an inductor from LX to the output of the buck
converter
Feedback Buck Pin.
Connect this pin to the output of the buck converter
Supply for DCDC Buck-Converter
Power Ground
Analog Ground
Enable.
Enables the Boost-Controller.
1 = Normal operation;
0 = Shutdown;
Selection for 3D Mode.
(only for AS1390A)
1 = 3D;
0 = 2D;
Exposed Pad.
This pad is not connected internally. Can be left floating or connect to
GND to achieve an optimal thermal performance.
13
-
-
MODE_3D
Exposed Pad
D IN
n.c.
www.ams.com/Power-Management/AS1390
Revision 1.7
4 - 20
AS1390A, AS1390B
Datasheet - A b s o l u t e M a x i m u m R a t i n g s
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 6
is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Table 2. Absolute Maximum Ratings
Parameter
Electrical Parameters
VDDH to AGND
VDDL to AGND
VDDM to AGND
VBIAS to AGND
PGND to AGND
EN_BOOST, FB_2D, FB_3D, FB_BUCK
VDDH - 5.0
-0.3
AGND - 0.3
-100
Input Current (latch-up immunity)
-50
Electrostatic Discharge
Human Body Model @ VDDH, VDDM, LX,
VBIAS, GATE, VDDHP
Human Body Model for all other pins
Temperature Ranges and Storage Conditions
Junction Temperature (T
J-MAX
)
Storage Temperature Range
-65
+115
+150
ºC
ºC
The reflow peak soldering temperature (body
temperature) specified is in accordance with
IPC/
JEDEC J-STD-020 “Moisture/Reflow Sensitivity
Classification for Non-Hermetic Solid State
Surface Mount Devices”.
The lead finish for Pb-free leaded packages is
matte tin (100% Sn).
Represents a maximum floor life time of 168h
4
2
kV
kV
Norm: MIL 883 E method 3015
+50
mA
40
5.0
20
VDDH + 0.3
+0.3
VDD + 0.3
+100
V
V
V
V
V
V
mA
Norm: JEDEC 78
Ambient Temperature +85°C
Norm: JEDEC 78
Ambient Temperature 115°C
Min
Max
Units
Notes
Package Body Temperature
+260
ºC
Humidity non-condensing
Moisture Sensitive Level
5
3
85
%
www.ams.com/Power-Management/AS1390
Revision 1.7
5 - 20
综合技术交流
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
