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Datasheet LTC3526B-2 PDF ( 特性, スペック, ピン接続図 )

部品番号 LTC3526B-2
部品説明 500mA 2MHz Synchronous Step-Up DC/DC Converters
メーカ Linear Technology
ロゴ Linear Technology ロゴ 
プレビュー
Total 16 pages
		
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LTC3526B-2 Datasheet, LTC3526B-2 PDF,ピン配置, 機能
LTC3526-2/LTC3526B-2
500mA 2MHz Synchronous
Step-Up DC/DC Converters
in 2mm × 2mm DFN
FEATURES
DESCRIPTION
n Delivers 3.3V at 100mA from a Single Alkaline/
NiMH Cell or 3.3V at 200mA from Two Cells
n VIN Start-Up Voltage: 850mV
n VIN Operating Range: 0.5V to 5V
n 1.6V to 5.25V VOUT Range
n Up to 94% Efficiency
wwwn.DaOtuatSphuetetD4Uis.ccoomnnect
n 2MHz Fixed Frequency Operation
n VIN > VOUT Operation
n Integrated Soft-Start
n Current Mode Control with Internal Compensation
n Burst Mode® Operation with 9μA Quiescent Current
(LTC3526-2)
n Low Noise PWM Operation (LTC3526B-2)
n Internal Synchronous Rectifier
n Logic Controlled Shutdown (IQ < 1μA)
n Anti-Ringing Control
n Low Profile (2mm × 2mm × 0.75mm) DFN-6 Package
APPLICATIONS
n Medical Instruments
n Flash-Based MP3 Players
n Noise Canceling Headphones
n Wireless Mice
n Bluetooth Headsets
The LTC®3526-2/LTC3526B-2 are synchronous, fixed
frequency step-up DC/DC converters with output discon-
nect. Synchronous rectification enables high efficiency
in the low profile 2mm × 2mm DFN package. Battery life
in single AA/AAA powered products is extended further
with an 850mV start-up voltage and operation down to
500mV once started.
A switching frequency of 2MHz minimizes solution foot-
print by allowing the use of tiny, low profile inductors
and ceramic capacitors. The current mode PWM design
is internally compensated, reducing external parts count.
The LTC3526-2 features Burst Mode operation at light load
conditions, while the LTC3526B-2 features continuous
switching. Anti-ring circuitry eliminates EMI concerns by
damping the inductor in discontinuous mode. Additional
features include a low shutdown current of under 1μA and
thermal shutdown.
The LTC3526-2/LTC3526B-2 are housed in a 6-pin
2mm × 2mm × 0.75mm DFN package.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode
is a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners. Patents pending.
TYPICAL APPLICATION
2.2μH
VIN
1.6V TO 3.2V
1μF
OFF ON
SW
VIN VOUT
LTC3526-2
SHDN FB
GND
1.78M
VOUT
3.3V
200mA
4.7μF
1M
35262b2fA01a
LTC3526-2 Efficiency and Power Loss vs Load Current
100
VIN = 2.4V
90
80
EFFICIENCY
1000
100
70
60 10
50
POWER LOSS
40 1
30
20 0.1
10
0
0.01
0.01
0.1 1 10 100 1000
LOAD CURRENT (mA)
35262b2f TA01b
35262b2fa
1

1 Page



LTC3526B-2 pdf, ピン配列
LTC3526-2/LTC3526B-2
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3526E-2 is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Specification is guaranteed by design and not 100% tested in
production.
Note 4: Current measurements are made when the output is not switching.
Note 5: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may result in device degradation or failure.
Note 6: Failure to solder the exposed backside of the package to the PC
board ground plane will result in a thermal resistance much higher than
60°C/W.
wwwT.DYaPtaSIhCeeAt4LU.cPomERFORMANCE CHARACTERISTICS
Efficiency vs Load Current and VIN
for VOUT = 1.8V (LTC3526-2)
100 1000
90
80 100
70 VIN = 1.0V
60
VIN = 1.2V
VIN = 1.5V
50
10
40 1
30
20
10
0
0.01
PLOSS AT VIN = 1.0V 0.1
PLOSS AT VIN = 1.2V
PLOSS AT VIN = 1.5V
0.01
0.1 1 10 100 1000
LOAD CURRENT (mA)
35262b2f G01
Efficiency vs Load Current and VIN
for VOUT = 5V (LTC3526-2)
100 1000
90
80 100
70
60 10
50
40
30
20
10
0
0.01
VIN = 1.2V
VIN = 2.4V
VIN = 3.6V
VIN = 4.2V
1
PLOSS AT VIN = 1.2V
PLOSS AT VIN = 2.4V
0.1
PLOSS AT VIN = 3.6V
PLOSS AT VIN = 4.2V
0.01
0.1 1 10 100 1000
LOAD CURRENT (mA)
35262b2f
Efficiency vs Load Current and VIN
for VOUT = 3.3V (LTC3526-2)
100 1000
90
80
70
VIN = 1.2V
VIN = 2.4V
60 VIN = 3.0V
50
100
10
40 1
30
20
PLOSS AT VIN = 1.2V
PLOSS AT VIN = 2.4V
0.1
10 PLOSS AT VIN = 3.0V
0
0.01
0.1 1
0.01
10 100 1000
LOAD CURRENT (mA)
35262b2f G02
No-Load Input Current vs VIN
100
90
80
VOUT = 5V
70
VOUT = 3.3V
60
VOUT = 2.5V
50
VOUT = 1.8V
40
30
20
10
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
VIN (V)
35262b2f G04
Maximum Output Current vs VIN
400 VOUT = 3.3V
350 VOUT = 2.5V
300 VOUT = 1.8V
250
200
VOUT = 5V
150
100
50
L = 2.2μH
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
VIN (V)
35262b2f G05
Minimum Load Resistance
During Start-Up vs VIN
1000
100
10
0.85
0.95
1.05
VIN (V)
1.15 1.25
35262b2f
35262b2fa
3


3Pages


LTC3526B-2 電子部品, 半導体
LTC3526-2/LTC3526B-2
TYPICAL PERFORMANCE CHARACTERISTICS
Load Step Response
(Fixed Frequency)
VOUT
100mV/DIV
AC COUPLED
LOAD
CURRENT
50mA/DIV
www.DataSheet4U.com
VIN = 1.2V
100μs/DIV
VOUT = 3.3V
50mA TO 100mA STEP
COUT = 10μF
35262b2f
Load Step Response (from Burst
Mode Operation)
VOUT
100mV/DIV
AC COUPLED
LOAD
CURRENT
50mA/DIV
VIN = 1.2V
50μs/DIV
VOUT = 3.3V
5mA TO 100mA STEP
COUT = 10μF
35262b2f
PIN FUNCTIONS
SW (Pin 1): Switch Pin. Connect inductor between SW and
VIN. Keep PCB trace lengths as short and wide as possible
to reduce EMI. If the inductor current falls to zero or SHDN
is low, an internal anti-ringing switch is connected from
SW to VIN to minimize EMI.
GND (Pin 2): Signal and Power Ground. Provide a short
direct PCB path between GND and the (–) side of the input
and output capacitors.
VIN (Pin 3): Input Supply Pin. Connect a minimum of 1μF
ceramic decoupling capacitor from this pin to ground
using short direct PCB traces.
SHDN (Pin 4): Logic Controlled Shutdown Input. There
is an internal 4MΩ pull-down on this pin.
SHDN = High: Normal operation
SHDN = Low: Shutdown, quiescent current < 1μA
FB (Pin 5): Feedback Input to the gm Error Amplifier. Con-
nect resistor divider tap to this pin. The top of the divider
connects to the output capacitor, the bottom of the divider
connects to GND. Referring to the Block Diagram, the output
voltage can be adjusted from 1.6V to 5.25V by:
VOUT
=
1.195V


1+
R2 
R1
VOUT (Pin 6): Output voltage sense and drain of the internal
synchronous rectifier. PCB trace from VOUT to the output
filter capacitor (4.7μF minimum) should be as short and
wide as possible.
Exposed Pad (Pin 7): The Exposed Pad must be soldered
to the PCB ground plane. It serves as an additional ground
connection and as a means of conducting heat away from
the package.
6
35262b2fa

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