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LTC3523EUD-2-TRPBF Datasheet(PDF) 1 Page - Linear Technology

Part # LTC3523EUD-2-TRPBF
Description  Synchronous 600mA Step-Up and 400mA Step-Down DC/DC Converters
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3523EUD-2-TRPBF Datasheet(HTML) 1 Page - Linear Technology

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LTC3523/LTC3523-2
1
3523fb
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Synchronous 600mA Step-Up
and 400mA Step-Down
DC/DC Converters
The LTC
®3523/LTC3523-2 combine a 600mA step-up
DC/DC converter with a 400mA synchronous step-down
DC/DC converter in a tiny 3mm
× 3mm package. The
1.2MHz/2.4MHz switching frequencies minimize the
solution footprint while maintaining high efficiency. Both
converters feature soft-start and internal compensation,
simplifying the design.
Both the step-up and step-down converters are current
mode controlled and utilize an internal synchronous rec-
tifier for high efficiency. The step-up supports 0% duty
cycle operation and the step-down converter supports
100% duty cycle operation to extend battery run time.
If the MODE pin is held high, both converters automati-
cally transition between Burst Mode operation and PWM
operation improving light load efficiency. Fixed, low noise
1.2MHz/2.4MHz PWM operation is selected when MODE
is grounded.
The LTC3523/LTC3523-2 provide a sub-3μA shutdown
mode, overtemperature shutdown and current limit pro-
tection on both converters. The LTC3523/LTC3523-2 are
housed in a 16-lead 3mm
× 3mm × 0.75mm QFN package.
LTC3523 Efficiency and Power
Loss vs Load Current
n Dual High Efficiency DC/DC Converters:
Step-Up (VOUT = 1.8V to 5.25V, ISW = 600mA)
Step-Down (VOUT = 0.615V to 5.5V, IOUT = 400mA)
n 1.8V to 5.5V Input Voltage Range
n Up to 94% Efficiency
n Pin Selectable Burst Mode
® Operation
n 45μA Quiescent Current in Burst Mode Operation
n 1.2MHz (LTC3523) or 2.4MHz (LTC3523-2)
Switching Frequency
n Independent Power Good Indicator Outputs
n Integrated Soft-Start
n Thermal and Overcurrent Protection
n <3μA Quiescent Current in Shutdown
n Small 16-Lead 3mm
× 3mm × 0.75mm QFN Package
n Digital Cameras
n Medical Instruments
n Industrial Handhelds
n GPS Navigators
+
VIN1
SW1
SW2
FB2
MODE
PGOOD2
SHDN2
FB1
PGOOD1
SHDN1
VOUT
10pF
VIN
10μF
VOUT2
STEP-DOWN
OUTPUT
1.2V
200mA
511k
511k
3523 TA01a
634k
365k
4.7μH
4.7μH
VIN2
LTC3523
VBAT
GND1 GND2 GND3
47μF
2-CELL
ALKALINE
VIN
1.8V TO 3.2V
VOUT1
STEP-UP
OUTPUT
3.3V
200mA
10μF
OFF ON
OFF ON
LOAD CURRENT (mA)
30
90
100
20
10
80
50
70
60
40
0.1
10
100
1000
3523 TA01b
0
1000
10
100
1
0.1
1
STEP-UP
STEP-DOWN
VIN = 2.4V
VOUT1 = 3.3V
VOUT2 = 1.2V
fOSC = 1.2MHz
EFFICIENCY
P0WER LOSS
L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.


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