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PDF LTC3459 Data sheet ( Hoja de datos )
| Número de pieza | LTC3459 | |
| Descripción | 10V Micropower Synchronous Boost Converter in ThinSOT | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s Small Solution Size
s >85% Efficiency over Wide Load Range
s Internal Synchronous Rectifier
s VIN Range: 1.5V to 5.5V
s 5V at 30mA from 3.3V Input
s 3.3V at 20mA from 2 AA Cell Input
s Programmable Output Voltages Up to 10V
s Burst Mode® Operation
s Inrush Current Limiting
s Output Disconnect in Shutdown
s Ultralow Quiescent (10µA) and Shutdown
(< 1µA) Currents
s Low Profile (1mm) SOT-23 Package
U
APPLICATIO S
s General Purpose Micropower Boost
s Digital Cameras
s PDAs
s LCD Bias
s Small OLED Displays
s Supercap Charging
LTC3459
10V Micropower
Synchronous Boost Converter
in ThinSOT
DESCRIPTIO
The LTC®3459 is a low current, high efficiency synchronous
boost converter intended for low power, size constrained
portable applications. The LTC3459 can be powered from
a single lithium ion battery, a 2- to 3-cell stack of Alkaline
or Nickel batteries, or any low impedance voltage source
between 1.5V and 5.5V. The output is programmable via
an external divider between 2.5V and 10V. Although the part
is primarily intended for boost applications, VOUT will
maintain regulation below VIN (at reduced efficiency).
The LTC3459 offers Burst Mode operation with a fixed
peak current, providing high conversion efficiency over a
wide range of load currents. During start-up, inductor
current is controlled preventing the inrush surge current
found in many boost converters. In shutdown the output
is disconnected from the input and quiescent current is
reduced to <1µA.
The LTC3459 is offered in a low profile (1mm) 6-pin
SOT-23 (ThinSOTTM) package allowing a tiny footprint for
the total solution.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
ThinSOT is trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
5V
1µF
5V to 8V Converter
22µH
OFF ON
SW
VIN VOUT
LTC3459
SHDN FB
GND
2M
365k
47pF
VOUT
8V
30mA
4.7µF
3459 TA01a
100
VIN = 5V
VOUT = 8V
90
Efficiency
80
70
60
50
0.01
0.1 1
ILOAD (mA)
10 100
3459 TA01b
3459f
1
1 page  
LTC3459
PI FU CTIO S
SW (Pin 1): Switch Pin. Connect a 15µH to 33µH inductor
between SW and VIN. Keep PCB trace lengths as short and
wide as possible to reduce EMI and voltage overshoot. If
the inductor current falls to zero, the internal P-channel
MOSFET synchronous rectifier is turned off to prevent
reverse charging of the inductor.
GND (Pin 2): Signal and Power Ground. Provide a short,
direct PCB path between GND and the (–) side of the filter
capacitors on VIN and VOUT.
FB (Pin 3): Input to the Burst Mode Comparator. An
external resistor divider connected between VOUT, GND
and this pin sets the output voltage to:
VOUT = 1.22(1 + R1/R2)
SHDN (Pin 4): Master Shutdown Input. Driving SHDN low
disables all IC functions and reduces quiescent current
from the battery to less than 2µA. This pin must be pulled
above 1V to enable the IC.
VOUT (Pin 5): Regulated Output Voltage of the Boost
Regulator. Bypass VOUT with a low ESR, ESL ceramic
capacitor between 2.2µF and 10µF. VOUT ripple increases
with smaller capacitors.
VIN (Pin 6): Input Supply Pin. Bypass VIN with a low ESR,
ESL ceramic capacitor of at least 1µF.
3459f
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5 Page 
PACKAGE DESCRIPTIO
S6 Package
6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
0.62 0.95
MAX REF
1.22 REF
2.90 BSC
(NOTE 4)
3.85 MAX 2.62 REF
1.4 MIN
2.80 BSC
1.50 – 1.75
(NOTE 4)
PIN ONE ID
LTC3459
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.20 BSC
DATUM ‘A’
0.95 BSC
0.80 – 0.90
1.00 MAX
0.30 – 0.50 REF
0.09 – 0.20
NOTE:
(NOTE 3)
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
1.90 BSC
0.30 – 0.45
6 PLCS (NOTE 3)
0.01 – 0.10
S6 TSOT-23 0302
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.
3459f
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC3459.PDF ] | |
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