Analog Devices Linear ADI Power LTC3310-1 Manual

DESCRIPTION
Demonstration Circuit 3043A shows the
1V fixed output, synchronous step-down Silent Switcher
operating as a 2MHz 3.3V to 1.0V 10A buck regulator. The
LTC3310-1 supports operating frequencies from 500kHz
up to 5MHz. The LTC3310-1 is a compact, ultralow emis-
sion, high efficiency, and high speed synchronous mono-
lithic step-down switching regulator. The LTC3310-1 has
Active Voltage Positioning (AVP) where the output voltage
is dependent on load current. At light loads the output
voltage is regulated above the nominal value. At full load
the output voltage is regulated below the nominal value.
The DC load regulation is adjusted to improve transient
performance and reduce output capacitor requirements.
DC3043A is set up to run in forced continuous mode with
a 2MHz switching frequency but can be configured to
pulse skip mode and different switching frequencies. RT
is connected to VIN which sets the MODE/SYNC pin as an
input and allows the LTC3310-1 to sync from an external
clock. Connecting the MODE/SYNC pin to VIN sets the
PERFORMANCE SUMMARY
PARAMETER
DC3043A Input Voltage Range
DC3043A V Voltage Range
OUT
DC3043A Output Current
Switching Frequency
V Active Voltage Positioning
OUT
3.3V to 1.0V at 10A, 2MHz Automotive Low
EMI Buck Regulator in a 2.11cm
LTC3310-1
Specifications are at T
CONDITIONS
I = 4A
OUT
DEMO MANUAL DC3043A
10A, mode to pulse skip mode and connecting the MODE/SYNC
pin to GND sets the mode to forced continuous mode.
®
The DC3043A also has an EMI filter to reduce conducted
EMI. This EMI filter can be included by applying the input
voltage at the VIN EMI terminal. The EMI performance of
the board is shown in the EMI TEST RESULTS section.
The red lines in the EMI performance graphs illustrate
the CISPR25 Class 5 peak limits for the conducted and
radiated emission tests.
The LTC3310S/LTC3310-1 data sheet gives a complete
description of the part, operation and application infor-
mation. The data sheet must be read in conjunction with
this demo manual. The LTC3310-1 is assembled in a
3mm × 3mm LQFN package with exposed pad for low
thermal resistance. The layout recommendations for low
EMI operation and maximum thermal performance are
available in the data sheet section Low EMI PCB Layout.
Design files for this circuit board are
All registered trademarks and trademarks are the property of their respective owners.
= 25°C
A
LTC3310-1
2
Solution
available.
MIN TYP MAX
2.25 5.5
1.0
10
1.8 2.0 2.2
1.7 2.4 3.1
UNITS
V
V
A
MHz
mV/A
Rev. 0
1