MAXREFDES1269
Reference Guide
Description
The MAXREFDES1269 demonstrates how to build a DC-DC buck converter using the MAX20098 step-down controller for 5V DC output applications from a 6V to 36V input. This reference design delivers up to 20A at 5V output. The design uses a six-layer board. Table above shows an overview of the design specification.
The MAX20098 is a 3.5V to 36V synchronous, step-down DC-DC controller. It uses a current-mode control architecture and can operate in the pulse-width modulation (PWM) or skip-mode control schemes. The device can operate in dropout conditions at a 99% duty cycle. The external sync pin (FSYNC) logic input, under light-load applications, allows the device to operate either in the skip-mode or fixed-frequency forced-PWM (FPWM) mode to minimize electromagnetic interference (EMI). The output voltage is programmable from 1V to 10V with fixed 3.3V/5V options. The feedback (FB) regulation is accurate within ±1% over -40°C to +125°C.
Features
- Efficiency = 88% at Full Load
- Output-Voltage Ripple < 50mV across Line and Load Conditions
- Overshoot < 150mV for 50% Load Step
- Continuous Conduction Mode (CCM) Operation
- Internal Soft-Start
- Overall Solution Size = 572mm2
Designed, Built, Tested
Board pictured here has been fully assembled and tested. Not available for sale.
Schematic
PCB Layout
BOM
Test Results
Parametrics
| Input Type | Vin(Min) | Vin(Max) | Iout(Max) | Single/Multiple Output | Vout(V) | Pout(W) | Isolated/Non-Isolated | Topology |
|---|---|---|---|---|---|---|---|---|
| DC | 6 | 36 | 20 | - | 5 | 100 | Non-Isolated | Synchronous Buck |
Parametrics
| Input Type | DC |
| Vin(Min) | 6 |
| Vin(Max) | 36 |
| Iout(Max) | 20 |
| Single/Multiple Output | - |
| Vout(V) | 5 |
| Pout(W) | 100 |
| Isolated/Non-Isolated | Non-Isolated |
| Topology | Synchronous Buck |
Maxim Devices (1)
Part Number
|
Name
|
Product Family
|
Order
|
Design kits and evaluation modules |
|---|---|---|---|---|
| MAX20098 | Versatile Automotive 36V 2.2MHz Buck Controller with 3.5µA IQ | Switching Regulator - Switching Regulators | Buy Now | Design Kits |
Maxim Devices (1)
| Part Number
|
Product Family
|
|---|---|
|
Switching Regulator - Switching Regulators
Versatile Automotive 36V 2.2MHz Buck Controller with 3.5µA IQ
|
Design Files (5)
| Title
|
Type
|
Size
|
Date
|
|---|---|---|---|
 maxrefdes1269-schematic |
16KB | 2020-09-15 | |
| TTS MAXREFDES Test Results Template_Rev 0_0318 |
665KB | 2020-09-15 | |
| maxrefdes1269-bom |
CSV | 4KB | 2020-09-15 |
| maxrefdes1269-pcb |
1MB | 2020-09-15 | |
| maxrefdes1269-bom |
XLSX | 13KB | 2020-09-15 |
| Date
|
Type
|
|---|---|
| 2020-09-15 |
(PDF, 16KB) |
| 2020-09-15 |
(PDF, 665KB) |
| 2020-09-15 |
(CSV, 4KB) |
| 2020-09-15 |
(PDF, 1MB) |
| 2020-09-15 |
(XLSX, 13KB) |
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