Harman Kardon AVR 161 Service Manual ▷ View online
DB1230
3A, 700KHz, Synchronous Step-down Converter
Preliminary Datasheet DB1230P-02
19. Oct. 2011
1 of 19
DESCRIPTION
The DB1230 is a high frequency synchronous
rectified step-down regulator which integrates an
110m
rectified step-down regulator which integrates an
110m
Ω high-side power MOSFET and an 85mΩ
low-side power MOSFET.
It provides easy & compact solution to implement
3A continuous output current over a wide range
input from 4.5V to 16V with a good load and line
regulation.
3A continuous output current over a wide range
input from 4.5V to 16V with a good load and line
regulation.
The current-mode control operation provides a
good loop-stability under any system condition
and fast transient response.
good loop-stability under any system condition
and fast transient response.
According to an internal compensation and a high
frequency operation, the DB1230 requires a few
number of external components mentioned in the
basic dc-dc power system.
frequency operation, the DB1230 requires a few
number of external components mentioned in the
basic dc-dc power system.
The built-in protections are allowed to have a
simple design and a robust operation.
simple design and a robust operation.
For a good thermal performance, the DB1230
uses an internal temperature independent voltage
reference and the package that has low θ
uses an internal temperature independent voltage
reference and the package that has low θ
JA
(<50°C/W)
It is available in 8-pin SOP-EP or 14-pin TSSOP
package with an exposed pad.
package with an exposed pad.
FEATURES
4.5V to 16V operating input range.
High-side 110 m
Ω, low-side 85 mΩ
Built-in power MOSFETs.
Fixed PWM 700kHz switching frequency.
Output voltage accuracy : ± 2%
3A continuous output current.
Low reference voltage : 0.8V
Programmable
soft-start.
Internal
Compensation.
Built-in SCP, OCP, TSD Protection.
Thermally Enhanced 8-SOP-EP Package
APPLICATIONS
Digital Set Top Boxes.
Personal Video Recorder.
Flat Panel TV & Monitor.
Distributed Power Systems.
ORDERING INFORMATION
PART NUMBER
PACKAGE
DB1230HETR 8-SOP-EP
DB1230HPTR 14-TSSOP-EP
TYPICAL APPLICATION EFFICIENCY
Fig.1 Normal application circuit Fig.2 Efficiency (Vout=3.3V)
Harman Kardon
AVR 161 Service Manual
Page 97 of 178
DB1230
Preliminary Datasheet DB1230P-02
19. Oct. 2011
2 of 19
PIN DESCRIPTION
PIN NO.
SYMBOL
DESCRIPTION
1 EN
Enable pin.
For automatic start-up, please leave it open and in case of on/off control, there
should be pull-down resistor.(10K~100Kohm)
For automatic start-up, please leave it open and in case of on/off control, there
should be pull-down resistor.(10K~100Kohm)
2 FB
Feedback pin.
External resistors are connected between OUT and GND to set the regulated
output voltage based on 0.8V reference.
External resistors are connected between OUT and GND to set the regulated
output voltage based on 0.8V reference.
3 VCC
Internal regulated output.
A decoupling capacitor should be close to this pin as possible
A decoupling capacitor should be close to this pin as possible
4 SS
External soft-start program pin.
An external capacitor should be connected to GND.
An external capacitor should be connected to GND.
5 GND
Ground.
6 SW
Switching Node.
An inductor, internal high-side and low-side power switches are connected
An inductor, internal high-side and low-side power switches are connected
7 BS
Bootstrap pin.
The bootstrap charge capacitor should be connected between BS and SW to
provide a supply to gate driver of high-side power switch.
The bootstrap charge capacitor should be connected between BS and SW to
provide a supply to gate driver of high-side power switch.
8
IN
Input power supply pin.
EP Exposed
Pad
Exposed pad. Connect the exposed pad to GND for heat sink.
This pin combines thermal sink and power ground.
This pin combines thermal sink and power ground.
PIN CONFIGURATION
TOP VIEW
8-SOP-EP Package
Fig.3 DB1230 PIN configuration
Harman Kardon
AVR 161 Service Manual
Page 98 of 178
DB1510B
1A, 0.8V Dropout LDO Regulator
Datasheet AT1510BF-01
9. Nov. 2009
1 of 8
DESCRIPTION
The DB1510B low-dropout linear regulator
operates from input voltages as low as 2.2V and
are able to deliver up to 1A of continuous output
current the DB1510B offers low dropout (typically
800mV at 1A) and low quiescent current (typically
400uA at 0.1A).
operates from input voltages as low as 2.2V and
are able to deliver up to 1A of continuous output
current the DB1510B offers low dropout (typically
800mV at 1A) and low quiescent current (typically
400uA at 0.1A).
Fixed output voltages of the DB1510B are 1.0V,
1.2V, 1.5V, 1.8V, 2.5V, 2.8V, 3.3V & 3.5V and the
output voltage is 2% accurate over load and line
variations. These regulators use small 2.2
1.2V, 1.5V, 1.8V, 2.5V, 2.8V, 3.3V & 3.5V and the
output voltage is 2% accurate over load and line
variations. These regulators use small 2.2
μF
MLCC input capacitor and 4.7
μF MLCC output
capacitors to deliver 1A output current.
Soft-start reduces inrush current. The other
features include over current protection (OCP),
short-circuit protection (SCP), and thermal shut
down protection (TSD).
features include over current protection (OCP),
short-circuit protection (SCP), and thermal shut
down protection (TSD).
The DB1510B is packaged SOT-223, TO-252 &
8-pin thin dual flat no lead (TDFN) package that a
heat sink or an exposed pad for optimal power
dissipation.
8-pin thin dual flat no lead (TDFN) package that a
heat sink or an exposed pad for optimal power
dissipation.
FEATURES
Input Voltage Range: 2.2V to 6.0V
Quiescent Current: Typ. 400uA
Current limit : Min. 1.2A
Dropout Voltage: Typ. 800mV @ 1A
Compatible with MLCC Capacitors
Soft-Start Limits Inrush Current
Thermal Shutdown Protection
Over Current & Short Circuit Protection
APPLICATIONS
Servers
Storage
Networking
Optical
Modules
Post
Regulators
Notebooks
PDA
ORDERING INFORMATION
PART NUMBER
PACKAGE
DB1510BT3TRxx
NOTE1)
TO-252
(I)
DB1510BT32TRxx
NOTE1)
TO-252
(II)
DB1510BNNTRxx
NOTE1)
SOT-223
(I)
DB1510BNN2TRxx
NOTE1)
SOT-223
(II)
DB1510BDLTRxx
NOTE1)
8-TDFN
(3x3)
NOTE1) xx: Voltage Code, 1.0V (10), 1.2V (12), 1.5V (15),
1.8V (18), 2.5V (25), 2.8V (28), 3.3V (33) & 3.5V (35)
1.8V (18), 2.5V (25), 2.8V (28), 3.3V (33) & 3.5V (35)
TYPICAL APPLICATION
3-Lead Application Circuit Power Supply Ripple Rejection
8-TDFN (3x3) Application Circuit
DONGBU HITEK CONFIDENTIAL
Harman Kardon
AVR 161 Service Manual
Page 99 of 178
DB1510B
Datasheet AT1510BF-01
9. Nov. 2009
2 of 8
PIN DESCRIPTION
PIN NO
TO-252 (I)
SOT-223 (I)
TO-252 (II)
SOT-223 (II)
8-TDFN
SYMBOL
DESCRIPTION
1 3 1
VIN
Input
Voltage
2, TAB
1
3
GND
Ground
3
2, TAB
5, 6
OUT
Output Voltage
-
-
2, 4, 7, 8
NC
No Connection
PIN CONFIGURATION
TOP VIEW
TO-252 SOT-223 8-TDFN (3x3)
BLOCK DIAGRAM
DONGBU HITEK CONFIDENTIAL
Harman Kardon
AVR 161 Service Manual
Page 100 of 178
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