ANALOG DEVICES DC2615A High Efficiency 15A Silent Switcher Buck Regulator Owner’s Manual
- June 13, 2024
- Analog Devices
Table of Contents
ANALOG DEVICES DC2615A High Efficiency 15A Silent Switcher Buck Regulator
DESCRIPTION
Demonstration circuit 2615A features the LTC®7151S in a high efficiency 1.2V/15A step-down regulator with an input voltage range of 3.1V to 20V and a 1MHz switching frequency. The Silent Switcher®2 technology reduces the switching noise while the internal MOSFETs of the LTC7151S provide high efficiency over a wide input voltage range. No current sense resistor is required.
The LTC7151S employs a controlled on-time, valley current mode architecture. This architecture allows for a short minimum on-time which is ideal for high step down ratios. In addition, the architecture provides a fast load step response by allowing the switch node pulses to compress after the load steps up – see Figure 6.
Other features of the DC2615A include:
- Selectable light load operating modes of continuous conduction mode (CCM) or discontinuous mode (DCM).
- SYNC pin to synchronize the regulator to an external clock.
- PGOOD pin and RUN pin
The LTC7151S data sheet provides a complete description of the IC operation and application information. The data sheet must be read in conjunction with the quick start guide.
Design files for this circuit board are available.
All registered trademarks and trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
Specifications are at TA = 25°C, No Airflow
| PARAMETER | CONDITIONS | VALUE |
|---|---|---|
| Input Voltage Range | 3.1V to 20V | |
| Output Voltage | VIN = 3.1V to 20V, IOUT = 0A to 15A | 1.2V ± 2% |
| Maximum Output Current | VIN = 3.1V to 20V, VOUT = 1.2V | 15A |
| Nominal Switching Frequency | 1MHz | |
| Typical Efficiency See Figure 3 | VIN = 12V, IOUT = 15A | 87.6% Typical |
QUICK START PROCEDURE
The evaluation setup for demonstration circuit 2615A is straight forward. Refer to the diagram shown in Figure 1.
Next, follow the procedure below:
- With power off, connect the input supply, load and meters as shown in Figure 1. Preset the load to 0A and the VIN supply to 0V.
- Place the RUN jumper in the ON position and the MODE jumper in the CCM/SYNC position.
- Set the input voltage to 12V.
- heck VOUT. The output voltage should be within the regulation limits shown in the performance summary table.
- Apply 15A load and re-measure VOUT. It should be within the same regulation limits.
- After the basic performance has been verified, the other aspects of performance can be measured and observed.
Note: To avoid large input voltage transients, do not hot plug the input supply to the DC2615A. Connect the input supply first and then turn it on.
Output Ripple Measurement
When measuring the output voltage or input voltage ripple, be sure to place the probe directly across an output or input capacitor. Figure 2 shows one example. Leads are soldered to both sides of the capacitor. The probe’s ground ring makes contact with the return lead and the probe tip makes contact with the other lead.
-
Figure 1. Proper Measurement Setup of the DC2615A
NOTE: FOR ACCURATE EFFICIENCY MEASUREMENTS, MONITOR VOUT ACROSS COUT11 -
Figure 2. Measurement Output Voltage Ripple
-
Figure 3. Efficiency of the 1.2V/15A Regulator in CCM
-
Figure 4. Efficiency of the 1.2V/15A Regulator in CCM and DCM, VIN = 5V
-
Figure 5. Thermal Image of the 1.2V/15A Regulator, VIN = 12V, fSW = 1MHz,
L = Wurth 744308020 (200nH, 0.37mΩ Typ) 24°C Ambient, No Airflow
QUICK START PROCEDURE
(a) Load Step Pulse
(b) Rising Edge of Load Step
COUT = 2x Panasonic EEFSX0E331ER (330µF, 2.5V, 9mΩ) || (100µF, 6.3V, X5R, 1206), L = Wurth 744308020 (200nH, 0.37mΩ Typ), fSW = 1MHz
Figure 6. 5A to 15A Load Step, VIN = 5V. The Controlled On-Time Valley Current Mode Architecture of the LTC7151S Allows the Switch Node Pulses to Compress During the 5A to 15A Load Step Transition. Approximately 1µs After the Start of the Rising Edge, the Output Voltage Starts Its Recovery.
PARTS LIST
Required Circuit Components
ITEM| QTY| REFERENCE| PART DESCRIPTION|
MANUFACTURER/PART NUMBER
---|---|---|---|---
1| 2| C1, C3| CAP, 0.1µF, X5R, 25V, 10%, 0603| AVX, 06033D104KAT2A
2| 1| C4| CAP, 4.7µF, X5R, 6.3V, 10%, 0603| AVX, 06036D475KAT2A MURATA,
GRM188R60J475KE19D TDK, C1608X5R0J475K080AB
3| 1| C5| CAP, 4.7µF, X5R, 6.3V, 10%, 0805| AVX, 08056D475KAT2A
4| 2| CIN1, CIN4| CAP, 10µF, X5R, 25V, 10%, 1206| AVX, 12063D106KAT2A MURATA,
GRM31CR61E106KA12L TDK, C3216X5R1E106K160AB
5| 2| CIN2, CIN3| CAP, 4.7µF, X5R, 25V, 10%, 0805| MURATA, GRM219R61E475KA73D
TDK, C2012X5R1E475K085AC
6| 1| CIN5| CAP, 180µF, OS-CON, 25V, 20%, 8mm × 12mm SMD, E12| PANASONIC,
25SVPF180M
7| 1| CITH| CAP, 220pF, C0G, 50V, 5%, 0603| AVX, 06035A221JAT2A
8| 1| CITHP| CAP, 10pF, C0G, 25V, 5%, 0603| AVX, 06033A100JAT2A
9| 1| COUT1| CAP, 100µF, X5R, 6.3V, 20%,1206| MURATA, GRM31CR60J107ME39L TDK,
C3216X5R0J107M160AB
10| 2| COUT3, COUT4| CAP, 330µF, SP-CAP, 2.5V, 20%, 9mΩ, 6.3A, 7343|
PANASONIC, EEFSX0E331ER
11| 1| L1| IND, 0.2µH, HIGH CURRENT, 20%, 25A, SMD 1070| WURTH ELEKTRONIK,
744308020
12| 2| R1, R3| RES,100kΩ, 1%, 1/10W, 0603| NIC, NRC06F1003TRF PANASONIC,
ERJ3EKF1003V VISHAY, CRCW0603100KFKEA
13| 1| R2| RES, 162kΩ, 1%, 1/10W, 0603, AEC-Q200| PANASONIC, ERJ3EKF1623V
ROHM, MCR03EZPFX1623 VISHAY, CRCW0603162KFKEA
14| 1| R4| RES, 1Ω, 5%, 1/10W, 0603, AEC-Q200| VISHAY, CRCW06031R00JNEA
15| 1| R7| RES, 0Ω, 1/10W, 0603| NIC, NRC06ZOTRF
VISHAY, CRCW06030000Z0EA
16| 1| R8| RES, 10Ω, 5%, 1/10W, 0603| NIC, NRC06J100TRF VISHAY,
CRCW060310R0JNEA
17| 1| RFB1| RES, 14kΩ, 1%, 1/10W, 0603, AEC-Q200| VISHAY, CRCW060314K0FKEA
18| 1| RFB2| RES, 10kΩ, 1%, 1/10W, 0603, AEC-Q200| KOA SPEER, RK73H1JTTD1002F
PANASONIC, ERJ3EKF1002V VISHAY, CRCW060310K0FKEA
19| 1| RITH| RES, 40.2kΩ, 1%, 1/10W, 0603, AEC-Q200| NIC, NRC06F4022TRF
PANASONIC, ERJ3EKF4022V VISHAY, CRCW060340K2FKEA
20| 1| U1| IC, SYNCHRONOUS BUCK CONVERTER, LGA-28 (5mm × 4mm), 20V, 14A|
ANALOG DEVICES, LTC7151SEV#PBF
Load Step Circuit
| 1 | 1 | Q1 | XSTR, MOSFET, N-CH, 40V, TO-252 (DPAK) | VISHAY, SUD50N04-8M8P-4GE3 |
|---|---|---|---|---|
| 2 | 1 | R10 | RES, 0.01Ω, 1%, 1W, 2512, SENSE, AEC-Q200 | VISHAY, WSL2512R0100FEA |
| 3 | 1 | R9 | RES, 10kΩ, 1%, 1/10W, 0603, AEC-Q200 | KOA SPEER, RK73H1JTTD1002F |
PANASONIC, ERJ3EKF1002V VISHAY, CRCW060310K0FKEA
Additional Demo Board Circuit Components
ITEM| QTY| REFERENCE| PART DESCRIPTION|
MANUFACTURER/PART NUMBER
---|---|---|---|---
1| 0| COUT2, COUT8, COUT9| CAP, OPTION, 1206|
2| 0| COUT5, COUT6| CAP, OPTION, 7343|
3| 0| C7, CPL| CAP, OPTION, 0603|
4| 0| R5, R6, R11| RES, OPTION, 0603|
Hardware: For Demo Board Only
1| 13| E1, E2, E3, E4, E5, E6, E7, E8, E9, E10, E11, E12, E13″| TEST POINT,
TURRET, 0.094″, MTG. HOLE| MILL-MAX, 2501-2-00-80-00-00-07-0
---|---|---|---|---
2| 4| J1, J2, J3, J4| CONN, BANANA JACK, FEMALE, THT, NON-INSULATED, SWAGE|
KEYSTONE, 575-4
3| 3| JP1, JP2, JP3| CONN, SHUNT, FEMALE, 2 POS, 2mm| WURTH ELEKTRONIK,
60800213421
4| 2| JP1, JP3| CONN, HDR, MALE, 1×3, 2mm, VERT, STR, THT| WURTH ELEKTRONIK,
62000311121
5| 1| JP2| CONN, HDR, MALE, 2×2, 2mm, VERT, STR, THT| WURTH ELEKTRONIK,
62000421121
6| 4| MH1, MH2, MH3, MH4| STANDOFF, NYLON, SNAP-ON, 0.50″| WURTH ELEKTRONIK,
702935000
SCHEMATIC DIAGRAM
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