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Datasheet LTC3526L PDF ( 特性, スペック, ピン接続図 )

部品番号 LTC3526L
部品説明 500mA 1MHz 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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LTC3526L Datasheet, LTC3526L PDF,ピン配置, 機能
FEATURES
Delivers 3.3V at 100mA from a Single Alkaline/
NiMH Cell or 3.3V at 200mA from Two Cells
VIN Start-Up Voltage: 680mV
1.5V to 5.25V VOUT Range
Up to 94% Efficiency
Output Disconnect
www.Da1tMaSHhzeeFti4xUe.cdoFmrequency Operation
VIN > VOUT Operation
Integrated Soft-Start
Current Mode Control with Internal Compensation
Burst Mode® Operation with 9μA IQ (LTC3526L)
Low Noise PWM Operation (LT3526LB)
Internal Synchronous Rectifier
Logic Controlled Shutdown (IQ < 1μA)
Anti-Ring Control
Low Profile (2mm × 2mm × 0.75mm)
DFN-6 Package
APPLICATIONS
Medical Instruments
Noise Canceling Headphones
Wireless Mice
Bluetooth Headsets
LTC3526L/LTC3526LB
550mA 1MHz Synchronous
Step-Up DC/DC Converters
in 2mm × 2mm DFN
DESCRIPTION
The LTC®3526L/LTC3526LB 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
a 680mV start-up voltage and operation down to 500mV
once started.
A switching frequency of 1MHz 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 LTC3526L features Burst Mode operation at light load
conditions allowing it to maintain high efficiency over a
wide range of load. The LTC3526LB features fixed frequency
operation for low noise applications. Anti-ring circuitry
reduces EMI by damping the inductor in discontinuous
mode. Additional features include a low shutdown current
of under 1μA and thermal shutdown.
The LTC3526L/LTC3526LB are housed in a 2mm × 2mm
× 0.75mm DFN package.
, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
4.7μH
VIN
1.6V TO 3.2V
4.7μF
OFF ON
SW
VIN VOUT
LTC3526L
SHDN FB
GND
1.78M
VOUT
3.3V
200mA
4.7μF
1M
3526 TA01a
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)
3526 TA01b
3526lfb
1

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LTC3526L pdf, ピン配列
LTC3526L/LTC3526LB
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 reli-
ability and lifetime.
Note 2: The LTC3526LE/LTC3526LBE are 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.DYatPaSIhCeeAt4LU.cPomERFORMANCE CHARACTERISTICS
Efficiency vs Load Current and VIN
for VOUT = 1.8V (LTC3526L)
100 1000
90
80
70 VIN = 1.0V
60
VIN = 1.2V
VIN = 1.5V
50
100
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)
3526 G01
Efficiency vs Load Current and VIN
for VOUT = 3.3V (LTC3526L)
100 1000
90
80
70
VIN = 1.2V
VIN = 1.8V
60 VIN = 2.4V
50 VIN = 3.0V
100
10
40 1
30
20
10
0
0.01
PLOSS AT VIN = 1.2V
PLOSS AT VIN = 1.8V
0.1
PLOSS AT VIN = 2.4V
PLOSS AT VIN = 3.0V
0.01
0.1 1 10 100 1000
LOAD CURRENT (mA)
3526 G02
No-Load Input Current vs VIN
(LTC3526L)
100
90
VOUT = 5V
80
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)
3526 G04
Efficiency vs Load Current and VIN
for VOUT = 5V (LTC3526L)
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)
3526 G03
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 = 4.7μH
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
VIN (V)
3526 G05
Minimum Load Resistance
During Start-Up vs VIN
10000
VOUT = 3.3V
1000
100
10
0.65 0.75 0.85 0.95 1.05 1.15
VIN (V)
3526 G06
3526lfb
3


3Pages


LTC3526L 電子部品, 半導体
LTC3526L/LTC3526LB
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
3526 G21
Load Step Response (from Burst
Mode Operation) (LTC3526L)
VOUT
100mV/DIV
AC COUPLED
LOAD
CURRENT
50mA/DIV
VIN = 1.2V
50μs/DIV
VOUT = 3.3V
5mA TO 100mA STEP
COUT = 10μF
3526 G22
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 1.5V 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.
3526lfb
6

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