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Linear Analog Devices DC2985A Manual

Multi-output power management solution with 4 buck switching and 3 ldo linear regulators with i2c
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Multi-Output Power Management Solution with 4 Buck
Switching and 3 LDO Linear Regulators with I
DESCRIPTION
DC2985A is a multi-output power management solution
demonstration circuit, featuring the
two 2.5A, two 1.5A synchronous step-down DC/DC regu-
lators and three 300mA LDO regulators.
All regulators can be enabled with external enable pins.
After the first regulator is enabled, the remaining enable
pins use a precision threshold to allow hardwire-pro-
grammed Power-Up Sequence.
PERFORMANCE SUMMARY
SYMBOL
PARAMETER
V
Input Voltage Range
IN
V
BUCK1 Output Voltage
BUCK1
V
BUCK2 Output Voltage
BUCK2
V
BUCK3 Output Voltage
BUCK3
V
BUCK4 Output Voltage
BUCK4
V
LDO1 Output Voltage
LDO1
V
LDO2 Output Voltage
LDO2
V
LDO3 Output Voltage
LDO3
BOARD PHOTO
1
LT
3380. It contains
®
Specifications are at T
CONDITIONS
BUCK1 Enabled, I(BUCK1) = 0A ~ 2.5A
BUCK2 Enabled, I(BUCK2) = 0A ~ 2.5A
BUCK3 Enabled, I(BUCK3) = 0A ~ 1.5A
BUCK4 Enabled, I(BUCK4) = 0A ~ 1.5A
LDO1 Enabled, I(LDO1) = 0A ~ 300mA
LDO2 Enabled, I(LDO2) = 0A ~ 300mA
LDO3 Enabled, I(LDO3) = 0A ~ 300mA
Figure 1. DC2985A Board Photo
DEMO MANUAL DC2985A
A micro-USB communication interface is integrated on
board to allow software GUI to write or read the registers
2
in LT3380 via its I
C serial port. This GUI can control
regulator enables, power-down sequencing, output volt-
age levels, dynamic voltage scaling, operation modes,
status reporting and other special functions.
Refer to LT3380 data sheet for more details on the electri-
cal specifications and the setting of its command registers.
Design files for this circuit board are
All registered trademarks and trademarks are the property of their respective owners.
= 25°C
A
LT3380
available.
MIN
TYP
MAX
2.7
5.5
1.20
1.50
2.48
1.81
1.20
0.80
1.80
2
C
UNITS
V
V
V
V
V
V
V
V
Rev. 0
Rev. 0
1

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  • Page 1 DEMO MANUAL DC2985A LT3380 Multi-Output Power Management Solution with 4 Buck Switching and 3 LDO Linear Regulators with I DESCRIPTION DC2985A is a multi-output power management solution A micro-USB communication interface is integrated on demonstration circuit, featuring the 3380. It contains board to allow software GUI to write or read the registers ®...

  • Page 2: Efficiency Curves

    DEMO MANUAL DC2985A EFFICIENCY CURVES Specifications are at T = 25°C, f = 2.25MHz, V = 5V, without D1 BUCK1 1.2V Efficiency BUCK2 1.5V Efficiency BURST BURST PULSE PULSE SKIPPING SKIPPING FORCE FORCE CONTINUOUS CONTINUOUS 1000 1000 LOAD CURRENT (mA) LOAD CURRENT (mA) dc2985a G02 dc2985a G01...

  • Page 3: Transient Response

    DEMO MANUAL DC2985A TRANSIENT RESPONSE Specifications are at T = 25°C, f = 2.25 MHz, V = 5V BUCK1 1.2V Transient Response BUCK2 1.5V Transient Response FORCE CONTINUOUS FORCE CONTINUOUS 200mV/DIV 200mV/DIV PULSE SKIPPING PULSE SKIPPING 200mV/DIV 200mV/DIV BURST BURST 200mV/DIV 200mV/DIV 2.5A...

  • Page 4: Power Up Sequence

    DEMO MANUAL DC2985A POWER UP SEQUENCE Specifications are at T = 25°C, f = 2.25MHz, V = 5V, I = 100mA for all regulators Regulators Power-Up Sequencing LDO3 LDO1 BUCK4 BUCK1 LDO2 BUCK3 BUCK2 PWR_ON dc2985a G10 500µs/DIV QUICK START PROCEDURE Follow the procedure below to familiarize yourself with = 1.2V the DC2985A.

  • Page 5: Jumper Description

    DEMO MANUAL DC2985A JUMPER DESCRIPTION JUMPER NAME FUNCTION POSITION DESCRIPTION JP1-JP3 Input for the LDOs V(B3) Input from BUCK3 Input from External Source Connected to VIN_LDO Turret Input from VIN Turret JP4-JP10 _SEQ or Power Up Sequence for the Regulators Default Power Up Sequence _SEQ PGM/OFF...

  • Page 6: Test Setup

    DEMO MANUAL DC2985A TEST SETUP 1.5A POWER UP SEQUENCE PROGRAMMING SECTION – 300mA – – 1.5A – – 300mA – – 2.5A – – 2.5A 5V, 5A – – – 300mA – MICRO-USB CABLE PC RUNNING LT3380 DEMONSTRATION SOFTWARE Figure 2. Test Setup for DC2985A Demo Board Rev.
  • Page 7 DEMO MANUAL DC2985A DEMO CIRCUIT OPERATION SEQ_START -> EN_B1_SEQ Introduction to the DC2984A VB1_SEQ -> EN_B2_SEQ The DC2985A a multi-output power management solu- tion with I C interface featuring the LT3380. It contains VB2_SEQ -> EN_B3_SEQ four synchronous buck regulators and three LDO regula- VB3_SEQ ->...
  • Page 8 DEMO MANUAL DC2985A USING LT3380 GUI Install the LT3380 GUI Start the LT3380 GUI The LT3380 GUI can be downloaded from Analog.com or The LT3380 GUI applicaiotn should show up in the Recen- using QuickEval software. Double click the LT3380 GUI tely added section when clicking the Windows button.
  • Page 9 DEMO MANUAL DC2985A USING LT3380 GUI To change the register setup, right click on the register, The default setting of the Engineering tab is reading the and click Write Preset, then select the desired register registers continuously. User can change this setting by status.

  • Page 10: Parts List

    DEMO MANUAL DC2985A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components C1, C8-C11 CAP ., 10μF, X5R, 10V, 20%,0603, AEC-Q200 TAIYO YUDEN, LMK107BBJ106MAHT C2-C7 CAP ., 1μF, X5R, 25V, 10%, 0402, AEC-Q200 MURATA, GRT155R61E105KE01D C12, C15, C17, C19 CAP ., 47μF, X5R, 6.3V, 20%, 0805, AEC-Q200 MURATA, GRT21BR60J476ME13L C14, C16, C18, C20...
  • Page 11 DEMO MANUAL DC2985A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER R71, R72, R74 RES., 4.7k, 5%,1/16W, 0402, AEC-Q200 NIC, NRC04J472TRF RES., 115k, 1%, 1/10W, 0603 NIC, NRC06F1153TRF RES., 1Ω, 5%,1/16W, 0402, AEC-Q200 KOA SPEER, RK73B1ETTP1R0J R65-R67 RES., 301Ω, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF3010V R68, R69 RES., 2.2k, 5%,1/16W, 0402, AEC-Q200...

  • Page 12: Schematic Diagram

    DEMO MANUAL DC2985A SCHEMATIC DIAGRAM Rev. 0...
  • Page 13 DEMO MANUAL DC2985A SCHEMATIC DIAGRAM Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog 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.
  • Page 14 DEMO MANUAL DC2985A ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality. Legal Terms and Conditions By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern.

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