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DC1852A

Description
eval board buck-boost ltc3536
CategoryDevelopment board/suite/development tools   
File Size167KB,6 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance  
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DC1852A Overview

eval board buck-boost ltc3536

DEMO MANUAL DC1852A
LTC3536
1A, Low Noise, Wide V
IN
Buck-Boost DC/DC Converter
DESCRIPTION
Demonstration circuit 1852A is a combined step-up and
step-down DC/DC converter, using the LTC3536 monolithic
synchronous buck-boost regulator. The DC1852A has
wide input voltage range of 1.8V to 5.5V and is capable of
delivering up to 1A of output current. The output voltage
of the DC1852A can be set as low as 1.8V and can go as
high as 5.5V. DC1852A supports two operation modes:
fixed-frequency pulse-width modulation (PWM) and
Burst Mode
®
operation. Fixed-frequency mode of opera-
tion maximizes the output current, reduces output voltage
ripple, and yields a low noise switching spectrum. Burst
Mode operation employs a variable frequency switching
algorithm that minimizes the no-load input quiescent cur-
rent and improves efficiency at light loads.
The DC1852A consumes less than 28μA of quiescent cur-
rent during Burst Mode operation, and during shutdown,
it consumes less than 1μA. The DC1852A has a standard
operating frequency of 1MHz, but can be adjusted to
frequencies as high as 2MHz. If Pin 1 (RT) is tied to V
IN
,
the default switching frequency is 1.2MHz. Because of
the high switching frequency of the DC1852A, small, low
profile surface mount components are used in the circuit.
These features, plus the LTC3536’s small 12-lead MSOP
package, make the DC1852A a perfect match for battery-
powered, handheld applications.
Design files for this circuit board are available at
http://www.linear.com/demo
L,
LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
PARAMETER
Minimum Input Voltage
Maximum Input Voltage
Output Voltage V
OUT
Regulation
Maximum Continuous Output Current
Preset Operating Frequency
External Clock Sync. Frequency Range
Efficiency
Typical Output Ripple V
OUT
Burst Mode Operation
(T
A
= 25°C)
CONDITIONS
VALUE
1.8V
5.5V
V
IN
= 1.8V to 5.5V
Fixed Frequency Mode
R6 = 100kΩ
V
IN
= 5V, V
OUT
= 3.3V, I
OUT
= 1A
V
IN
= 5V, I
OUT
= 1A (20MHz BW)
V
IN
= 5V, V
OUT
= 3.3V
V
IN
= 2.5V, V
OUT
= 3.3V
3.3V ±2%
1A
1MHz
300kHz to 2MHz
95%
<15mV
P-P
<0.15A
<0.1A
dc1852af
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