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DESCRIPTION
Demonstration circuit 2867A features the
high efficiency 42V, 120mA synchronous step-down
regulator in 12-Lead 2mm × 2mm LQFN package. The
demo board is designed for 120mA at 5V output from
a 5.8V to 42V input, with the switching frequency pro-
grammed at 2MHz. The wide input range allows a variety
of input sources, such as automotive batteries and indus-
trial supplies.
The LT8604C is a compact high efficiency, and high fre-
quency synchronous monolithic step-down switching
regulator, with soft-start capacitor, compensation net-
work, BST and INTV
capacitors, all packed into a 2mm
CC
by 2mm package.
The switching frequency can be programmed via an oscil-
lator resistor over a wide range from 200kHz to 2.2MHz,
or sync to external clock through SYNC/MODE pin. Peak
current mode control with minimum on-time of as small
as 35ns allows high step-down conversion even at high
frequency.
The operation mode can be configured via the SYNC/
MODE pin for forced continuous mode, Burst Mode
operation, or spread spectrum mode. While in Burst Mode
PERFORMANCE SUMMARY
SYMBOL
PARAMETER
V
Input Supply Range
IN
V
Output Voltage
OUT
I
Maximum Output Current
OUT
f
Switching Frequency, FCM
SW
EFF
Efficiency, FCM
DEMO MANUAL DC2867A
High Efficiency 42V, 120mA
Synchronous Buck Regulator
LT
8604C, a
operation, the current limit of the LT8604C top switch is
®
approximately 215mA. The switching frequency will be
far lower than the RT programmed frequency, and corre-
spondingly much higher efficiency over wide loads ranges.
The low quiescent current and high efficiency in Burst
Mode make it an ideal solution for applications requiring
highest efficiency at very light load conditions, such as
automotive housekeeping supplies, industrial sensors,
flow meters, Internet of Things, and battery powered por-
table instruments.
The demo board 2867A has an EMI filter installed. The
EMI performance of the board running in SSFM mode is
shown in Figure 2, where the red lines are CISPR25 Class
5 average limits. The circuit passes the average limit with
a wide margin.
The LT8604/LT8604C 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. Contact ADI applications engineer for
technical support.
®
Design files for this circuit board are
All registered trademarks and trademarks are the property of their respective owners.
Specifications are at T
A
CONDITIONS
V
= 12V , I
= 120mA
IN
OUT
V
= 12V , I
= 120mA
IN
OUT
= 25°C
MIN
5.8
4.85
120
1.85
LT8604C
available.
TYP
MAX
UNITS
42
V
5
5.15
V
mA
2
2.15
MHz
90
%
Rev. 0
1
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Related Manuals for Analog Devices Linear ADI Power DC2867A
Summary of Contents for Analog Devices Linear ADI Power DC2867A
- Page 1 DEMO MANUAL DC2867A LT8604C High Efficiency 42V, 120mA Synchronous Buck Regulator DESCRIPTION Demonstration circuit 2867A features the 8604C, a operation, the current limit of the LT8604C top switch is ® high efficiency 42V, 120mA synchronous step-down approximately 215mA. The switching frequency will be regulator in 12-Lead 2mm ×...
- Page 2 DEMO MANUAL DC2867A QUICK START PROCEDURE Demonstration circuit 2867A is easy to set up to evalu- 4. Check for the proper output voltage (5V). If there is no ate the performance of the LT8604C. Refer to Figure 1 output, temporarily disconnect the load to make sure for proper measurement equipment setup and follow the that the load is not set too high or the output terminal procedure below:...
- Page 3 DEMO MANUAL DC2867A QUICK START PROCEDURE CISPR25 Conducted EMI Performance Voltage Method CLASS 5 AVERAGE LIMIT LT8604C 14VIN SSFM AMBIENT –10 –20 –30 –40 FREQUENCY (MHz) dc2867a F02a CISPR25 Radiated EMI Performance CLASS 5 AVERAGE LIMIT LT8604C 14VIN SSFM AMBIENT –10 –20 1000...
- Page 4 NIC, NRC06F4992TRF RES., 187k, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF1873V IC, 42V 120mA BUCK REGULATOR, LQFN-12 ANALOG DEVICES, LT8604CAV#TRMPBF Additional Demo Board Circuit Components CAP ., 10pF, C0G, 16V, 5%, 0603, OPT CAP ., 10µF, X5R, 6.3V, 20%, 0603, OPT C3, C10 CAP ., 1µF, X7R, 50V, 10%, 0805...
- Page 5 Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
- Page 6 Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc. (“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY.
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