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PDF LM2702 Data sheet ( Hoja de datos )
| Número de pieza | LM2702 | |
| Descripción | TFT Panel Module | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM2702 (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
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November 2002
LM2702
TFT Panel Module
General Description
The LM2702 is a compact bias solution for TFT displays. It
has a current mode PWM step-up DC/DC converter with a
2A, 0.2Ω internal switch. Capable of generating 8V at
170mA from a Lithium Ion battery, the LM2702 is ideal for
generating bias voltages for large screen LCD panels. The
LM2702 operates at a switching frequency of 600kHz allow-
ing for easy filtering and low noise. An external compensa-
tion pin gives the user flexibility in setting frequency compen-
sation, which makes possible the use of small, low ESR
ceramic capacitors at the output. The LM2702 uses a pat-
ented 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 LM2702
has an internal controllable PMOS switch used for control-
ling the row driver voltages. The switch can be controlled
externally with a control pin and delay time. The LM2702
contains a Vcom amplifier and a Gamma buffer capable of
supplying 50mA source and sink. The TSSOP-16 package
ensures a low profile overall solution.
Features
n 2A, 0.2Ω, internal power switch
n VIN operating range: 2.2V to 12V
n 600kHz switching frequency step-up DC/DC converter
n Inrush current limiting circuitry
n External softstart override
n Internal 7.3Ω 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
© 2002 National Semiconductor Corporation DS200511
20051131
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
Css Voltage
SWC Voltage
Supply Voltage, AVIN
Amplifier/Buffer Input/Output
Voltage
Delay
SWI
SWO
-0.3V to 12V
-0.3V to 18V
-0.3V to 7V
0.96V to 1.56V
-0.3V to 1.2V
-0.3V to 12V
-0.3V to 12V
Rail-to-Rail
GND to 1.3V
-0.3V to 30V
-0.3V to 30V
ESD Ratings
(Notes 3, 4)
Human Body Model
Machine Model
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 and AVIN = 8V, RCOM = RGAMMA = 50Ω, CCOM =
CGAMMA = 1nF.
Switching Regulator
Symbol
Parameter
Conditions
Min
(Note 5)
Typ
(Note 6)
Max
(Note 5)
Units
IQ Quiescent Current
Not Switching, FB = 2V
Switching, switch open, FB =
0.1V
1.6 2.3
mA
2.6 5.2
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 = 2.7V
(Note 7)
1.4 2 2.6 A
RDSON
IB
VIN
ISS
TSS
Switch RDSON (Note 8)
VIN = 2.7V
FB Pin Bias Current (Note 9)
Input Voltage Range
Soft Start Current
Internal Soft Start Ramp
Time
200 mΩ
60 500 nA
2.2 12 V
5 12 15 µA
7 10 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
40 135 290 µmho
135 V/V
78 85
%
480 600 720 kHz
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
External Soft Start and PMOS Delay
VOUT = 8V, VIN = 2.5V, RLOAD = 40Ω, CSS = none
CD = 100nF, RSW = 10k\1.5k, SWI = 30V, SWC = VIN
1) VIN, 2V/div, DC
2) VOUT, 10V/div, DC
3) IL, 500mA/div, DC
4) SWO, 20V/div, DC
T = 5ms/div
20051161
Input Offset Voltage vs. Common Mode Voltage
(Vcom, 3 units)
VOUT = 8V, VIN = 2.5V, RLOAD = 40Ω, CSS = 330nF
CD = 100nF, RSW = 10k\1.5k, SWI = 30V, SWC = VIN
1) VIN, 2V/div, DC
2) VOUT, 10V/div, DC
3) IL, 500mA/div, DC
4) SWO, 20V/div, DC
T = 5ms/div
20051162
Input Offset Voltage vs. Common Mode Voltage
(Vcom Over Temperature)
20051174
Input Offset Voltage vs. Common Mode Voltage
(Gamma, 3 units)
20051175
Input Offset Voltage vs. Common Mode Voltage
(Gamma Over Temperature)
20051176
11
20051177
www.national.com
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet LM2702.PDF ] | |
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