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PDF ADP3041 Data sheet ( Hoja de datos )
| Número de pieza | ADP3041 | |
| Descripción | TFT LCD Panel Power Module | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ADP3041 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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TFT LCD Panel Power Module
ADP3041
FEATURES
600 kHz PWM Frequency
Fully Integrated 1.5 A Power Switch
3% Output Regulation Accuracy
Simple Compensation
Small Inductor and MLC Capacitors
300 A Quiescent Supply Current
90% Efficiency
Undervoltage Lockout
5 Buffers
TSSOP 20-Lead Package
Pb-Free Part
APPLICATIONS
TFT LCD Bias Supplies
GENERAL DESCRIPTION
The ADP3041 is a fixed frequency, PWM step-up dc-to-dc
switching regulator with five buffers capable of 12 V boosted
output voltage in a TSSOP 20-lead package. It provides high
efficiency, low noise operation, and excellent dynamic response,
and is easy to use. The high switching frequency allows for small,
cost-saving, external inductive and capacitive components. The
ADP3041 operates in PWM current mode. The current limit
and the power switch are integrated completely on-chip.
Capable of operating from 2.5 V to 5.5 V input, the ADP3041
is ideal for thin-film transistor (TFT) liquid crystal display
(LCD) module applications, where local point-of-use power
regulation is required. Supporting output voltages down to 4.5 V,
the ADP3041 is ideal to generate today’s low voltage rails, pro-
viding the optimal solution in its class for delivering power
efficiently, responsively, and simply with minimal printed circuit
board area.
The ADP3041 integrates five buffers. Each buffer can deliver
35 mA output current and has rail-to-rail input and output
capability.
FUNCTIONAL BLOCK DIAGRAM
COMP
IN
REF
FB
ERROR
AMP
gm
BIAS
ADP3041
RAMP
GEN
F/F
RQ
S
COMPARATOR
DRIVER
SW
NC OSC
SD
SS
AVCC
VCMI
SOFT START
CURRENT
SENSE
AMPLIFIER
PGND
VCMO
G1I G1O
G2I G2O
G3I G3O
G4I G4O
AGND
REV. D
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved.
1 page  
Typical Performance Characteristics–ADP3041
100
90
TA = 25؇C
4.5V < VS < 16V
80
70
60
50
40
30
20
10
0
–12 –9
–6 –3 0 3 6
INPUT OFFSET VOLTAGE (mV)
9 12
TPC 1. Input Offset Voltage Distribution
0
–50
–100
VCM = VS/2
VS = 16V
–150
–200
VS = 4.5V
–250
–300
–350
–40 25
TEMPERATURE (؇C)
85
TPC 4. Input Bias Current vs. Temperature
300
4.5V < VS < 16V
250
200
150
100
50
0
0 10 20 30 40 50 60 70 80 90 100
TCVOS (V/؇C)
TPC 2. Input Offset Voltage Drift Distribution
5
4
3
2
1
VS = 4.5V
0
VS = 16V
–1
–2
–3
–4
–5
–40
25
85
TEMPERATURE (؇C)
TPC 5. Input Offset Current vs. Temperature
0
–0.25
VCM = VS/2
–0.50
–0.75
VS = 16V
–1.00
–1.25
VS = 4.5V
–1.50
–40 25
TEMPERATURE (؇C)
85
TPC 3. Input Offset Voltage vs. Temperature
15.96
15.95
15.94
VS = 16V
ILOAD = 5mA
4.46
4.45
4.44
15.93
4.43
15.92
4.42
15.91
4.41
15.90
4.40
15.89
15.88
VS = 4.5V
4.39
4.38
15.87
4.37
15.86
–40 25
TEMPERATURE (؇C)
85
4.36
TPC 6. Output Voltage Swing vs. Temperature
REV. D
–5–
5 Page 
ADP3041
COMP is allowed to rise slowly until the control loop limits the
voltage to that required for regulation. SS continues to rise and
no longer affects COMP once soft start is complete.
When SD goes low, an internal switch discharges the SS
capacitor to return its voltage to zero for soft restart.
Because of the large current that flows into the main MOSFET
switch, it is provided with a separate PGND return to the nega-
tive supply terminal to avoid corrupting the small-signal return,
GND, that can be used as a sense line at the output load point.
Buffers
This family of buffers is designed to drive large capacitive loads
in LCD applications. Each has high output current drive and
rail-to-rail input/output operation and can be powered from a
single 12 V supply. They are also intended for other applications
where low distortion and high output current drive are needed.
Input Overvoltage Protection
As with any semiconductor device, whenever the input exceeds
either supply voltage, attention needs to be paid to the input
overvoltage characteristics. As an overvoltage occurs, the ampli-
fier could be damaged, depending on the voltage level and the
magnitude of the fault current. When the input voltage exceeds
either supply by more than 0.6 V, the internal pin junctions
allow current to flow from the input to the supplies.
This input current is not inherently damaging to the device as
long as it is limited to 5 mA or less. If a condition exists using
the buffers where the input exceeds the supply more than 0.6 V,
a series external resistor should be added. The size of the resis-
tor can be calculated by using the maximum overvoltage divided
by 5 mA. This resistance should be placed in series with the
input exposed to an overvoltage.
Output Phase Reversal
The buffer family is immune to phase reversal. Although the
device’s output does not change phase, large currents due to
input overvoltage could damage the device. In applications
where the possibility of an input voltage exceeding the supply
voltage exists, overvoltage protection should be used as described
in the previous section.
APPLICATION INFORMATION
Output Voltage
The ADP3041 operates with an adjustable output from VIN to
12 V. The output voltage is fed back to the ADP3041 via resis-
tor dividers R1 and R2 (Figure 1). The feedback voltage is
1.233 V, so the output voltage is set by the formula
VOUT
= 1.233V
× 1 +
R1
R2
(1)
Because the feedback bias current is 100 nA maximum, R2 may
have a value up to 100 kΩ with minimum error due to the bias
current.
Inductor Selection
For most applications, the inductor used with the ADP3041
should be in the range of 1 µH to 22 µH. Several inductor
manufacturers are listed in Table I. When selecting an inductor,
it is important to make sure that the inductor used with the
ADP3041 is able to handle a peak current without saturation, and
that the peak current is below the current limit of the ADP3041.
Part
CMD4D11-4R7M
CCDRH5D18-100
CR43-4R7
CR43-100
DS1608-472
DS1608-103
D52LC-4R7M
D52LC-100M
L (µH)
4.7
10
4.7
10
4.7
10
Table I. Inductor Manufacturers
Max DCR (mΩ)
Height (mm)
166 1.1
124 2.0
109 3.5
182 3.5
60 2.9
75 2.9
4.7 84
10 137
2.0
2.0
Vendor
Sumida
847-545-6700
www.sumida.com
Coilcraft
847-639-6400
www.coilcraft.com
Toko
847-297-0070
www.tokoam.com
REV. D
–11–
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ADP3041.PDF ] | |
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