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Linear Technology Electronic Components Datasheet

LTC3527-1 Datasheet

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

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LTC3527/LTC3527-1
FEATURES
Dual 800mA/400mA,
1.2MHz/2.2MHz Synchronous
Step-Up DC/DC Converters
DESCRIPTION
Dual Synchronous Step-Up DC/DC Converters
Delivers 3.3V at 200mA/100mA from one Alkaline/
NiMH Cell, or 3.3V at 400mA/200mA from Two Cells
VIN Start-Up Voltage: 700mV
www.DataSheet04U.5.cVomto 5V VIN Range after Start-Up
1.6V to 5.25V VOUT Range
Output Disconnect in Shutdown
VIN > VOUT Operation
1.2MHz or 2.2MHz Operation
Up to 94% Efficiency
12µA Quiescent Current in Burst Mode® Operation
Inrush Current Limiting and Soft-Start
Internal Synchronous Rectifiers
Logic-Controlled Shutdown (< 2µA)
Quick VOUT Discharge (LTC3527-1)
16-Lead, 0.75mm × 3mm × 3mm QFN Package
APPLICATIONS
MP3/Personal Media Players
Noise Canceling/Bluetooth Headsets
Wireless Mice
Portable Medical Instruments
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.
, 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
Two-Cell Alkaline to 3.3V/1.8V Synchronous Boost Converters
+ 1.6V to 3.2V
VIN
4.7µF
4.7µH
VIN1 VIN VIN2
VOUT
3.3V
150mA
4.7µF 1.78M
ON
OFF
1M
SW1
VOUT1
LTC3527
SW2
VOUT2
FB1 FB2
PGOOD1
PGOOD2
SHDN1
SHDN2
MODE GND FSEL
ON
OFF
4.7µH
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
POWER
20 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
35271f
1


Linear Technology Electronic Components Datasheet

LTC3527-1 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
www.DataShSeetot4rUa.gcoemTemperature Range...................– 65°C to 125°C
PIN CONFIGURATION
TOP VIEW
16 15 14 13
SHDN1 1
12 SHDN2
FB1 2
11 FB2
17
MODE 3
10 FSEL
VIN1 4
9 VIN2
5678
UD PACKAGE
16-LEAD (3mm × 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-1#PBF
LTC3527EUD#TRPBF LDDK
LTC3527EUD-1#TRPBF LCXP
16-Lead (3mm × 3mm) Plastic QFN
16-Lead (3mm × 3mm) Plastic QFN
LEAD BASED FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3527EUD
LTC3527EUD-1
LTC3527EUD#TR
LTC3527EUD-1#TR
LDDK
LCXP
16-Lead (3mm × 3mm) Plastic QFN
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 denotes the specifications which apply over the full operating
temperature range, –40°C to 85°C. VIN = 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
Feedback Voltage FB1, FB2
ILOAD = 1mA
VOUT1
VOUT1, 0°C to 85°C
VOUT2
VOUT2, 0°C to 85°C
0.7 0.88
1.7
1.6
1.7
1.6
5.25
5.25
5.25
5.25
1.176 1.20 1.224
V
V
V
V
V
V
Feedback Input Current FB1, FB2
Quiescent Current: Shutdown
Quiescent Current: Burst Mode Operation
Quiescent Current: Active
NMOS Switch Leakage Current
PMOS Switch Leakage Current
VFB1,2 = 1.20V
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
VSW1,2 = 5V, VOUT1,2 = 0V, SHDN1,2 = 0V
1 50
0.1 2
nA
µA
12 µA
500 900
µA
0.1 10
µA
0.1 10
µA
35271f
2


Part Number LTC3527-1
Description 1.2MHz/2.2MHz Synchronous Step-Up DC/DC Converters
Maker Linear Technology Corporation
Total Page 20 Pages
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Linear Technology Corporation





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