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PDF LM3211 Data sheet ( Hoja de datos )
| Número de pieza | LM3211 | |
| Descripción | Step-up PWM DC/DC Converter Integrated with 4 Buffers | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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February 2004
LM3211
Step-up PWM DC/DC Converter Integrated with 4 Buffers
General Description
The LM3211 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 LM3211 is ideal for
generating bias voltages for large screen LCD panels. The
LM3211 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
LM3211 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 LM3211 contains 4 Gamma buffers capable
of supplying 35mA 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
n Handheld Devices
n Portable Applications
n Cellular Phones/Digital Cameras
Typical Application Circuit
© 2004 National Semiconductor Corporation DS200622
20062231
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 14V
Rail-to-Rail
Rail-to-Rail
ESD Ratings
(Note 3)
Human Body Model
Machine Model
2kV
150V
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 14V
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.
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 12 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)
20062264
Supply Current vs. Common Mode Voltage
20062265
Large Signal Step Response
20062266
Positive Slew Rate vs. Capacitive Load
20062268
Negative Slew Rate vs. Capacitive Load
20062269
11
20062270
www.national.com
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet LM3211.PDF ] | |
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