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PDF LM2711MT-ADJ Data sheet ( Hoja de datos )
| Número de pieza | LM2711MT-ADJ | |
| Descripción | TFT Panel Module | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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July 2003
LM2711
TFT Panel Module
General Description
The LM2711 is a compact bias solution for TFT displays. It
has a current mode PWM step-up DC/DC converter with a
1.4A, 0.17Ω internal switch. Capable of generating 8V at
300mA from a Lithium Ion battery, the LM2711 is ideal for
generating bias voltages for large screen LCD panels. The
LM2711 can be operated at switching frequencies of 600kHz
or 1.25MHz, allowing for easy filtering and low noise. An
external compensation pin gives the user flexibility in setting
frequency compensation, which makes possible the use of
small, low ESR ceramic capacitors at the output. The
LM2711 uses a patented internal circuitry to limit startup
inrush current of the boost switching regulator without the
use of an external softstart capacitor. An external softstart
pin enables the user to tailor the softstart to a specific
application. The LM2711 contains 4 Gamma buffers capable
of supplying 50mA source and sink. The TSSOP-20 package
ensures a low profile overall solution.
Features
n 1.4A, 0.17Ω, internal power switch
n VIN operating range: 2.2V to 7.5V
n 600kHz/1.25MHz selectable frequency step-up DC/DC
converter
n 20 pin TSSOP package
n Inrush current limiting circuitry
n External softstart override
n 4 Gamma buffers
Applications
n LCD Bias Supplies
Typical Application Circuit
© 2003 National Semiconductor Corporation DS200468
20046831
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
VSW Voltage
FB Voltage
VC Voltage
SHDN Voltage
FSLCT Voltage
Supply Voltage, Vs+
Buffer Input Voltage
Buffer Output Voltage
-0.3V to 7.5V
-0.3V to 18V
-0.3V to 7V
0.965V to 1.565V
-0.3V to VIN
AGND to VIN
-0.3V to 12V
Rail-to-Rail
Rail-to-Rail
ESD Ratings
(Note 3)
Human Body Model
Machine Model
2kV
200V
Operating Conditions
Operating Temperature
Storage Temperature
Supply Voltage, VIN
VSW Voltage
Supply Gamma Buffer, Vs+
−40˚C to +125˚C
−65˚C to +150˚C
2.2V to 7.5V
17V
4V to 12V
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 and Vs+ = 8V, Rox = 50Ω, Cox = 1nF.
Switching Regulator
Symbol
Parameter
Conditions
Min
(Note 4)
Typ
(Note 5)
Max
(Note 4)
Units
IQ Quiescent Current
Not Switching, FSCLT = 0V
Not Switching, FSCLT = VIN
Switching, FSCLT = 0V
1.6
1.65
2.5
2
2.2
3
mA
Switching, FSCLT = VIN
Shutdown mode
3.4 4
6 15 µA
VFB
%VFB/∆VIN
Feedback Voltage
Feedback Voltage Line
Regulation
1.239
1.265
0.03
1.291
0.05
V
%/V
ICL Switch Current Limit VIN = 2.5V, VOUT = 8V
(Note 6)
1.4 A
RDSON
IB
VIN
ISS
TSS
Switch RDSON (Note 7)
FB Pin Bias Current(Note 8)
Input Voltage Range
Soft Start Current
Internal Soft Start Ramp
Time
VIN = 2.7V
FSLCT = 0V
170 mΩ
30 90 nA
2.2 7.5 V
5 11 15 µA
6.7 10 mS
gm
AV
DMAX
fS
IL
SHDN
Error Amp Transconductance ∆I = 5µA
Error Amp Voltage Gain
Maximum Duty Cycle
Switching Frequency
FSLCT = 0V
Switch Leakage Current
SHDN Threshold
FSLCT = VIN
VSW = 17V
Output High
60 135 250 µmho
135 V/V
78 85
%
500 600 700 kHz
0.9 1.25 1.5 MHz
0.185
20
µA
0.85
0.6
V
Output Low
0.6 0.3
V
I SHDN
UVP
Shutdown Pin Current
On Threshold
0V ≤ SHDN ≤ VIN
0.5 1 µA
1.8 1.9
2
V
Off Threshold
1.7 1.8 1.9
V
Hysteresis
100 mV
5 www.national.com
5 Page 
Typical Performance Characteristics (Continued)
Output Voltage vs. Output Current
(sinking)
Output Voltage vs. Output Current
(sourcing)
20046864
Supply Current vs. Common Mode Voltage
20046865
Large Signal Step Response
(50Ω, 1nF ext. compensation)
20046866
Large Signal Step Response
(no ext. compensation)
20046867
Positive Slew Rate vs. Capacitive Load
20046868
11
20046869
www.national.com
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LM2711MT-ADJ.PDF ] | |
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