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PDF LM2715MT-ADJ Data sheet ( Hoja de datos )
| Número de pieza | LM2715MT-ADJ | |
| Descripción | TFT Panel Module | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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May 2003
LM2715
TFT Panel Module
General Description
The LM2715 is a compact bias solution for TFT displays. It
has a current mode PWM step-up DC/DC converter with a
1.3A, 0.18Ω internal switch. Capable of generating 8V at
240mA from a Lithium Ion battery, the LM2715 is ideal for
generating bias voltages for large screen LCD panels. The
LM2715 operates at a switching frequency of 1.25MHz al-
lowing for easy filtering and low noise. An external compen-
sation pin gives the user flexibility in setting frequency com-
pensation, which makes possible the use of small, low ESR
ceramic capacitors at the output. The LM2715 uses a pat-
ented internal circuitry to limit startup inrush current of the
boost switching regulator without the use of an external
softstart capacitor. The LM2715 has an internal controllable
PMOS switch used for controlling the row driver voltages.
The switch can be controlled externally with a control pin and
delay time. The LM2715 contains a Vcom amplifier and a
Gamma buffer capable of supplying 50mA source and sink.
The TSSOP-16 package ensures a low profile overall solu-
tion.
Features
n 1.3A, 0.18Ω, internal power switch
n VIN operating range: 2.2V to 12V
n 1.25MHz switching frequency step-up DC/DC converter
n Inrush current limiting circuitry
n Internal 7Ω PMOS switch
n PMOS switch control pin
n PMOS switch delay pin
n Vcom amplifier
n Gamma buffer
n 16 pin TSSOP package
Applications
n LCD Bias Supplies
Typical Application Circuit
© 2003 National Semiconductor Corporation DS200584
20058431
www.national.com
1 page  
Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
VIN
SW Voltage
FB Voltage
VC Voltage
SWC Voltage
Supply Voltage, AVIN
Amplifier/Buffer Input Voltage
Amplifier/Buffer Output
Voltage
Delay
SWI
-0.3V to 12V
-0.3V to 18V
-0.3V to 2V
0.96V to 1.56V
-0.3V to 12V
-0.3V to 12V
Rail-to-Rail
Rail-to-Rail
GND to 1.3V
-0.3V to 30V
SWO
ESD Ratings
(Note 3)
Human Body Model
Machine Model
-0.3V to 30V
2kV
200V
Operating Conditions
Operating Temperature
Storage Temperature
Supply Voltage, VIN
SW Voltage
Supply AVIN
SWI
−40˚C to +125˚C
−65˚C to +150˚C
2.2V to 12V
17.5V
4V to 12V
2.2V to 30V
Electrical Characteristics
Specifications in standard type face are for TJ = 25˚C and those with boldface type apply over the full Operating Tempera-
ture Range ( TJ = −40˚C to +125˚C). Unless otherwise specified VIN =2.2V, AVIN = 8V, RCOM = RGAMMA = 50Ω, CCOM =
CGAMMA = 1nF.
Switching Regulator
Symbol
Parameter
Conditions
Min
(Note 4)
Typ
(Note 5)
Max
(Note 4)
Units
IQ Quiescent Current
Not Switching, FB = 2V
Switching, switch open, FB =
0.1V
1.6 2.3
mA
3.6 4.3
VFB
%VFB/∆VIN
Feedback Voltage
Feedback Voltage Line
Regulation
1.239
1.265
0.01
1.291
0.1
V
%/V
ICL Switch Current Limit VIN = 2.5V, VOUT = 8V
(Note 6)
1.29
A
RDSON
IB
VIN
TSS
Switch RDSON (Note 7)
VIN = 2.5V
FB Pin Bias Current (Note 8)
Input Voltage Range
Internal Soft Start Ramp
Time
178 mΩ
60 200 nA
2.2 12 V
7 mS
gm
AV
DMAX
fS
IL
UVP
Error Amp Transconductance ∆I = 5µA
Error Amp Voltage Gain
Maximum Duty Cycle
Switching Frequency
Switch Leakage Current
On Threshold
VSW = 18V
85 110 270 µmho
135 V/V
78 85
%
1.0 1.25 1.5 MHz
0.1 20 µA
1.79
1.92
2.05
V
Off Threshold
1.69
1.82
1.95
V
Hysteresis
100 mV
5 www.national.com
5 Page 
Typical Performance Characteristics (Continued)
Internal Soft Start and PMOS Delay
Input Offset Voltage vs. Common Mode Voltage
(Vcom, 3 units)
VOUT = 8V, VIN = 2.5V, RLOAD = 32Ω
CD = 100nF, RSW = 10k\1.5k, SWI = 30V, SWC = VIN
1) VIN, 2V/div, DC
2) VOUT, 5V/div, DC
3) IL, 500mA/div, DC
4) SWO, 20V/div, DC
T = 5ms/div
20058461
Input Offset Voltage vs. Common Mode Voltage
(Vcom Over Temperature)
20058474
Input Offset Voltage vs. Common Mode Voltage
(Gamma, 3 units)
20058475
Input Offset Voltage vs. Common Mode Voltage
(Gamma Over Temperature)
20058476
Input Bias Current vs. Common Mode Voltage
(Vcom)
20058477
11
20058478
www.national.com
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LM2715MT-ADJ.PDF ] | |
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