LTC3528 Datasheet PDF - Linear Technology Corporation

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LTC3528
Linear Technology Corporation

Part Number LTC3528
Description 1MHz Synchronous Step-Up DC/DC Converters
Page 16 Pages


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LTC3528/LTC3528B
1A, 1MHz Synchronous
Step-Up DC/DC Converters
in 3mm × 2mm DFN
FEATURES
DESCRIPTION
Delivers 3.3V at 200mA from a Single Alkaline/
NiMH Cell or 3.3V at 400mA from Two Cells
VIN Start-Up Voltage: 700mV
1.6V to 5.25V VOUT Range
www.DataSheetU4Up.ctoom94% Efficiency
Output Disconnect
1MHz Fixed Frequency Operation
VIN > VOUT Operation
Integrated Soft-Start
Current Mode Control with Internal Compensation
Burst Mode® Operation with 12μA Quiescent Current
(LTC3528)
Low Noise PWM Operation (LTC3528B)
Internal Synchronous Rectifier
Logic Controlled Shutdown: <1μA
Anti-Ringing Control
Low Profile (3mm × 2mm × 0.75mm) DFN Package
APPLICATIONS
Medical Instruments
Flash-Based MP3 Players
Noise Canceling Headphones
Wireless Mice
Bluetooth Headsets
The LTC®3528/LTC3528B are synchronous, fixed frequency
step-up DC/DC converters with output disconnect. High
efficiency synchronous rectification, in addition to a 700mV
start-up voltage and operation down to 500mV once
started, provides longer run-time for single or multiple
cell battery-powered products.
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 is internally
compensated, simplifying the design process. The LTC3528
enters Burst Mode operation at light loads, while the
LTC3528B features continuous switching at light loads.
Anti-ringing circuitry reduces EMI by damping the inductor
in discontinuous mode. Additional features include a low
shutdown current, open-drain power good output, short-
circuit protection and thermal overload protection.
The LTC3528/LTC3528B are offered in an 8-lead 3mm ×
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
1.8V TO 3.2V
4.7μF
OFF ON
SW
VIN VOUT
LTC3528
PGOOD FB
SHDN
GND
499k
287k
33pF
VOUT
3.3V
400mA
10μF
3528 TA01a
Efficiency and Power Loss
100
VOUT = 3.3V
90 VIN = 2.4V
80
EFFICIENCY
70
1000
100
10
60 1
POWER LOSS
50
0.1
40
30
0.01
0.1 1 10 100
LOAD CURRENT (mA)
0.01
1000
3528 TA01b
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LTC3528/LTC3528B
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN Voltage................................................... –0.3V to 6V
SW Voltage
DC............................................................ –0.3V to 6V
Pulsed < 100ns........................................ –0.3V to 7V
SHDN, FB Voltage ........................................ –0.3V to 6V
VOUT............................................................. –0.3V to 6V
PGOOD......................................................... –0.3V to 6V
Operating Temperature Range
www.DataSh(eNeto4tUe.sco2m, 5).............................................. –40°C to 85°C
Storage Temperature Range................... –65°C to 125°C
PIN CONFIGURATION
TOP VIEW
SHDN 1
8 VIN
FB 2
7 SGND
9
PGOOD 3
6 PGND
VOUT 4
5 SW
DDB PACKAGE
8-LEAD (3mm × 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 76°C/W (NOTE 6)
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3528EDDB#PBF
LTC3528BEDDB#PBF
LTC3528EDDB#TRPBF LCYD
LTC3528BEDDB#TRPBF LDDG
8-Lead (3mm × 2mm) Plastic DFN
8-Lead (3mm × 2mm) Plastic DFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the specified operating
temperature range of –40°C to 85°C, otherwise specifications are at TA = 25°C. VIN = 1.2V, VOUT = 3.3V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Minimum Start-Up Voltage
Output Voltage Adjust Range
Feedback Voltage
ILOAD = 1mA
TA = 0°C to 85°C
(Note 7)
1.7
1.6
1.170
0.70
1.200
0.88
5.25
5.25
1.230
V
V
V
V
Feedback Input Current
Quiescent Current—Shutdown
Quiescent Current—Active
Quiescent Current—Burst
VFB = 1.3V
VSHDN = 0V, Not Including Switch Leakage, VOUT = 0V
Measured on VOUT, Nonswitching (Note 4)
Measured on VOUT, FB > 1.230V
1 50
0.01 1
300 500
12 20
nA
μA
μA
μA
N-Channel MOSFET Switch Leakage Current
P-Channel MOSFET Switch Leakage Current
N-Channel MOSFET Switch On Resistance
VSW = 5V
VSW = 5V, VOUT = 0V
0.1
0.1
0.175
10
10
μA
μA
Ω
P-Channel MOSFET Switch On Resistance
0.250
Ω
N-Channel MOSFET Current Limit
1.0
1.5
A
Current Limit Delay Time to Output
(Note 3)
60 ns
Maximum Duty Cycle
Minimum Duty Cycle
Frequency
VFB = 1.15V
VFB = 1.3V
88
93
0
0.7 1.0 1.3
%
%
MHz
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LTC3528/LTC3528B
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the specified operating
temperature range of –40°C to 85°C, otherwise specifications are at TA = 25°C. VIN = 1.2V, VOUT = 3.3V, unless otherwise noted.
PARAMETER
SHDN Input High Voltage
CONDITIONS
MIN TYP MAX UNITS
0.88 V
SHDN Input Low Voltage
0.25 V
SHDN Input Current
VSHDN = 1.2V
0.3 1
μA
PGOOD Threshold Percentage
Referenced to Feedback Voltage Falling
–7 –10 –13
%
PGOOD Low Voltage
IPGOOD = 1mA
VOUT = 1.6V, IPGOOD = 1mA
PGOOD Leakage Current
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VPGOOD = 5.5V
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 LTC3528E 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.
0.05 0.1
0.05 0.2
0.01 1
V
V
μA
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
76°C/W.
Note 7: The IC is tested in a feedback loop to make the measurement.
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C unless otherwise noted)
Efficiency vs Load Current and VIN
for VOUT = 1.8V (LTC3528)
100 1000
90 EFFICIENCY
80 100
70
60 10
50
POWER
LOSS
40 1
30
20
10
0
0.01
VIN = 1V 0.1
VIN = 1.2V
VIN = 1.5V
0.01
0.1 1 10 100 1000
LOAD CURRENT (mA)
3528 G01
Efficiency vs Load Current and VIN
for VOUT = 3V (LTC3528)
100
EFFICIENCY
90
1000
80 100
70
60 10
50 POWER
LOSS
40 1
30
20
10
0
0.01
VIN = 1V 0.1
VIN = 1.5V
VIN = 2.4V
0.01
0.1 1
10 100 1000
LOAD CURRENT (mA)
3528 G26
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LTC3528/LTC3528B
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C unless otherwise noted)
Efficiency vs Load Current and VIN
for VOUT = 3.3V (LTC3528)
100 1000
EFFICIENCY
90
100
80
70 10
60
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POWER
LOSS
1
50
40
VIN = 1.2V
VIN = 1.8V
0.1
VIN = 2.4V
30 VIN = 3V 0.01
0.01 0.1 1 10 100 1000
LOAD CURRENT (mA)
3528 G02
Efficiency vs Load Current and VIN
for VOUT = 5V (LTC3528)
100 1000
EFFICIENCY
90
100
80
70
60
50
40
30
0.01
POWER
LOSS
10
VIN = 1.2V 1
VIN = 2.4V
VIN = 3.6V
VIN = 4.2V 0.1
0.1 1 10 100 1000
LOAD CURRENT (mA)
3528 G03
Maximum Output Current vs VIN
800
700
600
500
400
300
200
VOUT = 1.8V
100 VOUT = 3.3V
VOUT = 5V
0
1 1.5 2 2.5 3 3.5 4 4.5
VIN (V)
3528 G05
Burst Mode Threshold Current
vs VIN
40
VOUT = 1.8V
30
RISING
20
FALLING
10
Minimum Load Resistance During
Start-Up vs VIN
10000
1000
100
10
0.7
0.8 0.9
VIN (V)
1
3528 G06
Burst Mode Threshold Current
vs VIN
50
VOUT = 3V
40
RISING
30
FALLING
20
10
No-Load Input Current vs VIN
(LTC3528)
130
110
90
70
VOUT = 1.8V
50
VOUT = 3V
VOUT = 3.3V
VOUT = 5V
30
10
1
23
VIN (V)
45
3528 G04
Start-Up Delay Time vs VIN
130
120
110
100
90
80
70
60
50
1 1.5 2 2.5 3 3.5 4 4.5
VIN (V)
3528 G07
Burst Mode Threshold Current
vs VIN
60
VOUT = 3.3V
RISING
40
FALLING
20
0
1 1.1 1.2 1.3 1.4 1.5
VIN (V)
3528 G08
0
1
1.5 2
VIN (V)
2.5
3528 G09
0
1 1.5 2 2.5 3
VIN (V)
3528 G10
3528fa
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