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Linear Technology Electronic Components Datasheet

LTC3536EDD Datasheet

Buck-Boost DC/DC Converter

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LTC3536
1A Low Noise, Buck-Boost
DC/DC Converter
Features
n Regulated Output with Input Voltage Above, Below
or Equal to the Output Voltage
n 1.8V to 5.5V Input and Output Voltage Range
n 1A Continuous Output Current for
VIN ≥ 3V, VOUT = 3.3V
n ±1% Output Voltage Accuracy
n Low Noise Buck-Boost Architecture
n Up to 95% Efficiency
n Programmable Frequency from 300kHz to 2MHz
n Synchronizable Oscillator
n Burst Mode® Operation: 32µA IQ
n Internal 1ms Soft-Start
n Output Disconnect in Shutdown
n Shutdown Current: 1µA
n Short-Circuit Protection
n Small Thermally Enhanced 12-Pin MSOP
and 10-Pin (3mm × 3mm) DFN Packages
Applications
n Wireless Inventory Terminals
n Handheld Medical Instruments
n Wireless Locators, Microphones
n Supercapacitor Backup Power Supply
Description
The LTC®3536 is an extended VIN range, fixed frequency,
synchronous buck-boost DC/DC converter that operates
from input voltages above, below or equal to the regulated
output voltage. The topology incorporated in the LTC3536
provides low noise operation, making it ideal for RF and
precision measurement applications.
The device can produce up to 1A of continuous output
current, and it includes two N-channel and two P-channel
MOSFET switches. Switching frequencies up to 2MHz can
be programmed with an external resistor and the oscilla-
tor can be synchronized to an external clock. Quiescent
current is only 32µA in Burst Mode operation, maximizing
battery life in portable applications. Burst Mode operation
is user controlled and improves efficiency at light loads.
Other features include a 1µA shutdown current, internal
soft-start, overtemperature protection and current limit.
The LTC3536 is available in 12-pin thermally enhanced
MSOP and 10-pin (3mm × 3mm) DFN packages.
L, LT, LTC, LTM, Burst Mode, LTSpice, Linear Technology and the Linear logo are registered
trademarks and PowerPath and No RSENSE are trademarks of Linear Technology Corporation. All
other trademarks are the property of their respective owners.
Typical Application
VIN
1.8V TO 5.5V
10µF
4.7µH
PWM BURST
OFF ON
SW1
VIN
SW2
VOUT
LTC3536
MODE/SYNC FB
SHDN
RT
VC
PGND SGND
47pF
6.49k
220pF
49.9k
1000k
221k
VOUT
3.3V
1A FOR VIN ≥ 3V
22µF
3536 TA01a
Efficiency vs Input Voltage
100
95
ILOAD = 200mA
90
85
ILOAD = 1A
80
75
70
65
60
55
50
1.5 2 2.5 3 3.5 4 4.5 5 5.5
INPUT VOLTAGE (V)
3536 TA01b
3536fa
1


Linear Technology Electronic Components Datasheet

LTC3536EDD Datasheet

Buck-Boost DC/DC Converter

No Preview Available !

LTC3536
Absolute Maximum Ratings (Note 1)
VIN, VOUT, (SVIN, PVIN) Voltage..................... –0.3V to 6V
SW1, SW2 Voltage
DC............................................................. –0.3V to 6V
Pulsed (<100ns).........................................–1.0V to 7V
VC, RT, FB, SHDN Voltage............................. –0.3V to 6V
MODE/SYNC Voltage.................................... –0.3V to 6V
Operating Junction Temperature Range
(Notes 2, 3)............................................. –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSE................................................................... 300°C
Pin Configuration
TOP VIEW
RT 1
SGND 2
MODE/SYNC 3
SW1 4
SW2 5
11
PGND
10 VC
9 FB
8 SHDN
7 VIN
6 VOUT
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 39.7°C/W
EXPOSED PAD (PIN 11) IS PGND, MUST BE SOLDERED TO PCB
TOP VIEW
RT 1
SGND 2
MODE/SYNC 3
SW1 4
PGND 5
SW2 6
13
PGND
12 VC
11 FB
10 SHDN
9 VIN
8 VIN
7 VOUT
MSE PACKAGE
12-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 40°C/W
EXPOSED PAD (PIN 13) IS PGND MUST BE SOLDERED TO PCB
FOR RATED THERMAL PERFORMANCE AND LOAD REGULATION
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3536EDD#PBF
LTC3536EDD#TRPBF
LFZD
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3536IDD#PBF
LTC3536IDD#TRPBF
LFZD
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3536EMSE#PBF
LTC3536EMSE#TRPBF 3536
12-Lead Plastic MSOP
–40°C to 125°C
LTC3536IMSE#PBF
LTC3536IMSE#TRPBF 3536
12-Lead Plastic MSOP
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/
Electrical Characteristics The l denotes the specifications which apply over the full operating junction
temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 3.3V, VOUT = 3.3V, RT = 100kΩ unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Operating Range
l 1.8
5.5
V
Output Voltage Adjust Range
l 1.8
5.5
V
Undervoltage Lockout Threshold
Feedback Voltage
Feedback Pin Input Current (FB)
VIN Ramping Down
VIN Ramping Up
0°C < TJ < 85°C (Note 5)
–40°C < TJ < 125°C
VFB = 0.6V in Servo Loop, VMODE/SYNC = 0V
l 1.6 1.67
V
l
1.75 1.8
V
0.594 0.6 0.606
V
l 0.591 0.6 0.609
V
50
nA
Quiescent Current, Burst Mode Operation
Quiescent Current, Shutdown (IVIN)
VFB = 0.7V, VMODE/SYNC = VIN
VSHDN = 0V
32
42
0.1
1
µA
µA
3536fa
2


Part Number LTC3536EDD
Description Buck-Boost DC/DC Converter
Maker Linear
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