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PDF LTC3450EUD Data sheet ( Hoja de datos )
| Número de pieza | LTC3450EUD | |
| Descripción | Triple Output Power Supply for Small TFT-LCD Displays | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC3450
Triple Output Power Supply
for Small TFT-LCD Displays
FEATURES
s Generates Three Voltages:
5.1V at 10mA
– 5V, –10, or –15V at 500µA
10V or 15V at 500µA
s Better than 90% Efficiency
s Low Output Ripple: Less than 5mVP-P
s Complete 1mm Component Profile Solution
s Controlled Power-Up Sequence: AVDD/VGL/VGH
s All Outputs Disconnected and Actively Discharged in
Shutdown
s Low Noise Fixed Frequency Operation
s Frequency Reduction Input for High Efficiency in
Blank Mode
s Ultralow Quiescent Current: 75µA (Typ) in Scan Mode
s Available in a 3mm × 3mm 16-Pin QFN Package
U
APPLICATIO S
s Cellular Handsets with Color Display
s Handheld Instruments
s PDA
DESCRIPTIO
The LTC®3450 is a complete power converter solution for
small thin film transistor (TFT) liquid crystal display (LCD)
panels. The device operates from a single Lithium-Ion cell,
2- to 3-cell alkaline input or any voltage source between
1.5V and 4.6V.
The synchronous boost converter generates a low noise,
high efficiency 5.1V, 10mA supply. Internal charge pumps
are used to generate 10V, 15V, and –5V, –10V or –15V.
Output sequencing is controlled internally to insure proper
initialization of the LCD panel.
A master shutdown input reduces quiescent current to
<2µA and quickly discharges each output for rapid turn off
of the LCD panel. The LTC3450 is offered in a low profile
(0.8mm max), 3mm × 3mm 16-pin QFN package, mini-
mizing the solution profile and footprint.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
VIN
1.5V TO
4.6V
5.1V, –10V, 15V Triple Output TFT-LCD Supply
47µH
2.2µF
BLANK SCAN
OFF ON
87
6 SW
VIN
VOUT
C1
+
11
C1– 10
4
MODE
12
V2X
LTC3450 C2+ 14
5 SHDN
C2– 13
V3X 15
9 GND
VNEG
C3– C3+VINV 16
3 21
2.2µF
0.1µF
0.1µF
AVDD
5.1V/10mA
0.47µF
VGH (3 × AVDD)
15V/500µA
0.1µF
0.1µF
0.1µF
VGL
–10V/500µA
3450 TA01
AVDD Efficiency vs VIN
100
5mA LOAD
95
100µH
90
47µH
85
80
75
70
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
VIN (V)
3450 TA01b
3450f
1
1 page  
LTC3450
TYPICAL PERFOR A CE CHARACTERISTICS
AVDD Ripple Voltage
AVDD Load = 5mA
AVDD Transient Response
AVDD
5mV/DIV
(AC)
VIN = 3.6V
C2 = 2.2µF
1µs/DIV
AVDD, VGL, VGH Turn-On and
Turn-Off Sequence
3450 G10
VGH 0
10V/DIV
AVDD
5V/DIV
0
VGL
5V/DIV
VIN = 3.6V
C2 = 2.2µF
2ms/DIV
3450 G12
AVDD
100mV/DIV
(AC)
AVDD LOAD 5mA
5mA/DIV 1mA
VIN = 3.6V
C2 = 2.2µF
100µs/DIV
3450 G11
AVDD Turn-On Showing Inrush
Current Limiting
INDUCTOR
CURRENT
100mA/DIV
0
AVDD
2V/DIV
0
VIN = 3.6V
20µs/DIV
3450 G13
3450f
5
5 Page 
PACKAGE DESCRIPTIO
UD Package
16-Lead Plastic QFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1691)
LTC3450
0.57 ±0.05
3.35 ± 0.05
1.45 ± 0.05
2.20 ± 0.05 (4 SIDES)
PACKAGE OUTLINE
0.23 ±0.05
0.50 BCS
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
3.00 ± 0.10
(4 SIDES)
PIN 1
TOP MARK
0.75 ± 0.05
BOTTOM VIEW—EXPOSED PAD
R = 0.115
TYP
15 16
0.40 ± 0.10
1.45 ± 0.10
(4-SIDES)
1
2
0.200 REF
0.00 – 0.05
NOTE:
1. DRAWING CONFORMS TO JEDEC PACKAGE OUTLINE MO-220 VARIATION (WEED-2)
2. ALL DIMENSIONS ARE IN MILLIMETERS
3. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
4. EXPOSED PAD SHALL BE SOLDER PLATED
(UD) QFN 0802
0.23 ± 0.05
0.50 BSC
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
3450f
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC3450EUD.PDF ] | |
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