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LTC3450EUD#PBF

P1-P3P4-P6P7-P9P10-P12
LTC3450
1
3450fa
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
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
(0.75mm), 3mm × 3mm 16-pin QFN package, minimizing
the solution profile and footprint.
■
Cellular Handsets with Color Display
■
Handheld Instruments
■
PDA
■
Generates Three Voltages:
5.1V at 10mA
– 5V, –10V, or –15V at 500µA
10V or 15V at 500µA
■
Better than 90% Efficiency
■
Low Output Ripple: Less than 5mV
P-P
■
Complete 1mm Component Profile Solution
■
Controlled Power-Up Sequence: AV
DD
/V
GL
/V
GH
■
All Outputs Disconnected and Actively Discharged in
Shutdown
■
Low Noise Fixed Frequency Operation
■
Frequency Reduction Input for High Efficiency in
Blank Mode
■
Ultralow Quiescent Current: 75µA (Typ) in Scan Mode
■
Available in a 3mm × 3mm 16-Pin QFN Package
Triple Output Power Supply
for Small TFT-LCD Displays
0.1µF
2.2µF
V
IN
1.5V TO
4.6V
AV
DD
5.1V/10mA
VGH (3 × AV
DD
)
15V/500µA
VGL
–10V/500µA
3450 TA01
0.1µF
C1
+
C1
–
0.1µF
C2
+
C2
–
11
78
10
14
13
V2X
V3X
V
INV
V
IN
SHDN
MODE
SW V
OUT
V
NEG
LTC3450
GND
12
15
16
123
6
5
OFF ON
BLANK SCAN
47µH
4
9
2.2µF
0.47µF
0.1µF
0.1µF
C3
–
C3
+
5.1V, –10V, 15V Triple Output TFT-LCD Supply
AV
DD
Efficiency vs V
IN
V
IN
(V)
1.5
EFFICIENCY (%)
100
95
90
85
80
75
70
3.0 4.0
3450 TA01b
2.0 2.5
3.5 4.5 5.0
100µH
47µH
5mA LOAD
LTC3450
2
3450fa
V
IN
, SW.......................................................... –0.3 to 7V
SHDN, MODE................................................. –0.3 to 7V
V
OUT
..........................................................................
–0.3 to 5.5V
V
NEG
........................................................................
–17V to 0.3V
Operating Temperature Range
LTC3450E (Note 4) ............................. –40°C to 85°C
Storage Temperature Range ................. –65°C to 125°C
ORDER PART
NUMBER
T
JMAX
= 125°C, θ
JA
= 68°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LTC3450EUD
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
(Note 1) (Referred to GND)
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.6V, V
OUT
= 5.2V unless otherwise noted.
16 15 14 13
5 6 7 8
TOP VIEW
UD PACKAGE
16-LEAD (3mm × 3mm) PLASTIC QFN
EXPOSED PAD IS V
NEG
(PIN 17)
MUST BE SOLDERED TO PCB
9
10
11
12
17
4
3
2
1C3
+
C3
–
V
NEG
MODE
V2X
C1
+
C1
–
GND
V
INV
V3X
C2
+
C2
–
SHDN
V
IN
V
OUT
SW
UD PART MARKING
LAAC
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage Range ● 1.5 4.6 V
V
IN
Quiescent Supply Current MODE = V
IN
75 130 µA
V
OUT
Quiescent Supply Current MODE = V
IN
80 µA
V
IN
Quiescent Supply Current MODE = GND 30 50 µA
V
OUT
Quiescent Supply Current MODE = GND 13 µA
V
IN
Quiescent Current SHDN = GND, V
OUT
OPEN 0.01 2 µA
5V Boost Regulator
V
OUT
Output Voltage Load on V
OUT
= 5mA 5.049 5.100 5.151 V
V
OUT
Efficiency Load on V
OUT
= 5mA, (Note 2) 90 %
V
OUT
Maximum Output Current L = 47µH, (Note 2) 11 mA
Switch Current Limit 90 120 mA
Switching Frequency—Boost MODE = V
IN
550 kHz
Switching Frequency—Boost MODE = GND 15.62 kHz
Charge Pumps
V2X Output Voltage Load on V2X = 100µA ● 9.792 10.1 10.608 V
LTC3450
3
3450fa
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.6V, V
OUT
= 5.2V unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Specification is guaranteed by design and not 100% tested in
production.
V3X Output Voltage Load on V3X = 100µA ● 14.688 15.2 15.912 V
V2X Efficiency Load on V2X = 100µA, (Note 2) 90 %
V3X Efficiency Load on V3X = 100µA, (Note 2) 80 %
Output Impedance V2X, V3X Flying Capacitors = 0.1µF1kΩ
V
NEG
Output Voltage Load on V
NEG
= 100µA, V
INV
= V2X ● –10.608 –10.1 –9.792 V
V
NEG
Efficiency Load on V
NEG
= 100µA (Note 2) 80 %
Output Impedance V
NEG
Flying Capacitor = 0.1µF1kΩ
Switching Frequency Charge Pumps MODE = V
IN
62.5 kHz
Switching Frequency Charge Pumps MODE = GND 3.75 kHz
V
NEG
to V3X Delay (Note 3) 3 4 10 ms
Logic Inputs
SHDN Pin Threshold ● 0.4 0.77 1.2 V
MODE Pin Threshold 1.6 V
Note 3: Measured from point at which V
NEG
crosses –5V to point at which
C2
–
starts switching.
Note 4: The LTC3450E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
P1-P3P4-P6P7-P9P10-P12

LTC3450EUD#PBF

Mfr. #:
Buy LTC3450EUD#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 3x Out Pwr S for Small TFT-LCD Displays
Lifecycle:
New from this manufacturer.
Delivery:
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