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Linear Technology Electronic Components Datasheet

LTC3527EUD Datasheet

1.2MHz/2.2MHz Synchronous Step-Up DC/DC Converters

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LTC3527/LTC3527-1
Dual 800mA/400mA,
1.2MHz/2.2MHz Synchronous
Step-Up DC/DC Converters
FEATURES
n Dual Synchronous Step-Up DC/DC Converters
n Delivers 3.3V at 200mA/100mA from one Alkaline/
NiMH Cell, or 3.3V at 400mA/200mA from Two Cells
n VIN Start-Up Voltage: 700mV
n 0.5V to 5V VIN Range After Start-Up
n 1.6V to 5.25V VOUT Range
n Output Disconnect in Shutdown
n VIN > VOUT Operation
n 1.2MHz or 2.2MHz Operation
n Up to 94% Efficiency
n 12μA Quiescent Current in Burst Mode® Operation
n Inrush Current Limiting and Soft-Start
n Internal Synchronous Rectifiers
n Logic-Controlled Shutdown (< 2μA)
n Quick VOUT Discharge (LTC3527-1)
n 16-Lead, 0.75mm × 3mm × 3mm QFN Package
APPLICATIONS
n MP3/Personal Media Players
n Noise Canceling/Bluetooth Headsets
n Wireless Mice
n Portable Medical Instruments
DESCRIPTION
The LTC®3527/LTC3527-1 are dual high efficiency, step-up
DC/DC converters in a space saving 16-lead 3mm × 3mm
QFN package. Battery life is maximized with a 700mV start-
up voltage and operation down to 500mV once started.
The SHDN and PGOOD pins enable the converters to be
sequenced or started together.
The LTC3527/LTC3527-1 limit inrush current during start-
up. Selectable 1.2MHz or 2.2MHz operation provides a
choice between the highest efficiency or smallest solu-
tion footprint. The current mode PWM design is internally
compensated reducing external parts count. Burst Mode
operation or fixed frequency operation is selectable via the
MODE pin. Anti-ring circuitry reduces EMI in discontinuous
mode. This device also features thermal shutdown.
True output disconnect allows the output to be completely
open in shutdown. The LTC3527-1 actively discharges
VOUT1 or VOUT2 when its respective SHDN goes low. Qui-
escent current in shutdown is less than 2μA.
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.
TYPICAL APPLICATION
Two-Cell Alkaline to 3.3V/1.8V Synchronous Boost Converters
+ 1.6V to 3.2V
VIN
4.7μF
VOUT
3.3V
150mA
4.7μF 1.78M
1M
ON
OFF
ON
OFF
4.7μH
VIN1 VIN VIN2
SW1
VOUT1
15pF
LTC3527
SW2
VOUT2
FB1
FB2
PGOOD1
SHDN1
PGOOD2
SHDN2
MODE GND FSEL
4.7μH
15pF 619k
1.21M
35271 TA01
VOUT
1.8V
150mA
4.7μF
1.2MHz Efficiency and Power Loss
100
BURST
90 EFFICIENCY
80
1000
100
70
60
10
50 FIXED
FREQUENCY
40
1
30
20
POWER
LOSS
0.1
10
BURST
0
VIN = 2.4V
VOUT1 = 3.3V
0.01
0.01 0.1
1
10 100 1000
LOAD CURRENT (mA)
35271 TA01b
35271fc
1


Linear Technology Electronic Components Datasheet

LTC3527EUD Datasheet

1.2MHz/2.2MHz Synchronous Step-Up DC/DC Converters

No Preview Available !

LTC3527/LTC3527-1
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN, VIN1, VIN2 Voltage ................................. –0.3V to 6V
SW1, SW2 Voltage (DC) .............................. –0.3V to 6V
(Pulsed < 100ns) ..................................... –0.3V to 7V
SHDN1, SHDN2, FB1, FB2 Voltage............... –0.3V to 6V
VOUT1, VOUT2................................................ –0.3V to 6V
MODE, FSEL, PGOOD1, PGOOD2................. –0.3V to 6V
Operating Temperature (Notes 2, 5).........–40°C to 85°C
Junction Temperature ........................................... 125°C
Storage Temperature Range...................–65°C to 125°C
PIN CONFIGURATION
TOP VIEW
16 15 14 13
SHDN1 1
12 SHDN2
FB1 2
MODE 3
17
PGND
11 FB2
10 FSEL
VIN1 4
9 VIN2
5678
UD PACKAGE
16-LEAD (3mm s 3mm) PLASTIC QFN
TJMAX = 125°C, θJA = 68°C/W
EXPOSED PAD (PIN 17) IS PGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3527EUD#PBF
LTC3527EUD#TRPBF LDDK
16-Lead (3mm × 3mm) Plastic QFN
LTC3527EUD-1#PBF
LTC3527EUD-1#TRPBF LCXP
16-Lead (3mm × 3mm) Plastic QFN
LEAD BASED FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3527EUD
LTC3527EUD#TR
LDDK
16-Lead (3mm × 3mm) Plastic QFN
LTC3527EUD-1
LTC3527EUD-1#TR
LCXP
16-Lead (3mm × 3mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, –40°C to 85°C. VIN = VIN1 = VIN2 = 1.2V, VOUT1 = VOUT2 = 3.3V, TA = 25°C, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Minimum Start-Up Voltage
Output Voltage Adjust Range
Line Regulation
Feedback Voltage FB1, FB2
ILOAD = 1mA
VOUT1
VOUT1
VOUT2
VOUT2
VIN = 1V to 5V
0.7
0.88
V
l 1.7
1.6
l 1.7
1.6
5.25
V
5.25
V
5.25
V
5.25
V
0.005
%/V
l 1.176 1.20 1.224
V
Feedback Input Current FB1, FB2
VFB1,2 = 1.20V
1
50
nA
Quiescent Current: Shutdown
Quiescent Current: Burst Mode Operation
Quiescent Current: Active
NMOS Switch Leakage Current (LTC3527)
VSHDN1 = VSHDN2 = 0V, Not Including Switch
Leakage, VOUT1 = VOUT2 = 0V
Measured on VOUT, VFB1 = VFB2 = 1.5V
VFB1 = VFB2 > 1.2V (Note 3)
VSW1,2 = 5V, SHDN1,2 = 0V
0.1
2
μA
12
μA
500
900
μA
0.1
10
μA
35271fc
2


Part Number LTC3527EUD
Description 1.2MHz/2.2MHz Synchronous Step-Up DC/DC Converters
Maker Linear
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LTC3527EUD Datasheet PDF






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