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PDF LT3483A Data sheet ( Hoja de datos )
| Número de pieza | LT3483A | |
| Descripción | Inverting Micropower DC/DC Converter | |
| Fabricantes | Linear | |
| Logotipo |  |
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FEATURES
n Internal 40V Schottky Diode
n One Resistor Feedback (Other Resistor Inside)
n Internal 40V, 200mA/400mA Power Switch
n Generates Regulated Negative Outputs to –38V
n Low Quiescent Current:
40µA in Active Mode
<1µA in Shutdown Mode
n Low VCESAT Switch: 200mV at 150mA
n Wide Input Range: 2.5V to 16V
n Uses Small Surface Mount Components
n Output Short-Circuit Protected
n Available in a 6-Lead SOT-23 (LT3483 Only) and
Low Profile 8-Lead DFN (2mm × 2mm × 0.75mm)
Packages
APPLICATIONS
n LCD Bias
n Handheld Computers
n Battery Backup
n Digital Cameras
n OLED Bias
LT3483/LT3483A
Inverting Micropower
DC/DC Converters
with Schottky
DESCRIPTION
The LT®3483/LT3483A are micropower inverting DC/DC
converters with integrated Schottky and one resistor
feedback. The small package size, high level of integration
and use of tiny surface mount components yield a solution
size as small as 40mm2. The devices feature a quiescent
current of only 40µA at no load, which further reduces
to 0.1µA in shutdown. A current limited, fixed off-time
control scheme conserves operating current, resulting
in high efficiency over a broad range of load current. A
precisely trimmed 10µA feedback current enables one
resistor feedback and virtually eliminates feedback load-
ing of the output. The 40V switch enables voltage outputs
up to –38V to be generated without the use of costly
transformers. The LT3483/LT3483A’s low 300ns off-time
permits the use of tiny low profile inductors and capaci-
tors to minimize footprint and cost in space-conscious
portable applications.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners. Protected by U.S. Patents, including 7710700.
TYPICAL APPLICATION
VIN
3.6V
4.7µF
3.6V to –8V DC/DC Converter
10µH
0.22µF
SW
VIN D
LT3483
SHDN FB
GND
10Ω
5pF 806k
VOUT
–8V
25mA
2.2µF
3483 TA01a
Efficiency and Power Loss
75 VIN = 3.6V
70 EFFICIENCY
1000
100
65 10
POWER
LOSS
60 1
55
0.1
1 10
LOAD CURRENT (mA)
0.1
100
3483 TA01b
3483fc
1
1 page  
LT3483/LT3483A
PIN FUNCTIONS (DFN/TSOT-23)
FB (Pin 1/Pin 3): Feedback. Place resistor to negative
output here. Set resistor value R1 = VOUT/10µA.
GND (Pins 2, 3/Pin 2): Ground. For DFN package, tie both
pin 2 and pin 3 together to ground.
SW (Pin 4/Pin 1): Switch. Connect to external inductor
L1 and positive terminal of transfer capacitor.
VIN (Pin 5/Pin 6): Input Supply. Must be locally bypassed
with 1µF or greater.
NC (Pin 6/NA): No Internal Connection.
D (Pin 7/Pin 5): Anode Terminal of Integrated Schottky
Diode. Connect to negative terminal of transfer capaci-
tor and external inductor L2 (flyback configuration) or
to cathode of external Schottky diode (inverting charge
pump configuration).
SHDN (Pin 8/Pin 4): Shutdown. Connect to GND to turn
device off. Connect to supply to turn device on.
Exposed Pad (Pin 9/NA): GND. The exposed pad should
be soldered to the PCB ground to achieve the rated thermal
performance.
BLOCK DIAGRAM
1.250V
REFERENCE
125k
VOUT R1 3 FB
+
A3
–
OPTIONAL CHARGE PUMP CONFIGURATION.
L1B REPLACED WITH:
D2 R2
D VOUT
L1A L1B
VIN
• CFLY •
VOUT
COUT
300ns
DELAY
SQ
RQ
6
VIN
1
SW
5
D
Q1 D1
25mV
+
A1
–
20mV
(LT3483)
0.1Ω
0.1Ω
+
A2
–
GND
2
PIN NUMBERS CORRESPOND TO THE
6-PIN TSOT-23 PACKAGE
3483 BD
3483fc
5
5 Page 
REVISION HISTORY (Revision history begins at Rev C)
REV DATE DESCRIPTION
C 09/10 Revised entire data sheet to add LTC3483A
LT3483/LT3483A
PAGE NUMBER
1-12
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 representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
3483fc
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LT3483A.PDF ] | |
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