MAX16974EVKIT+ Maxim Integrated Products, MAX16974EVKIT+ Datasheet

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MAX16974EVKIT+

Manufacturer Part Number
MAX16974EVKIT+
Description
Power Management Modules & Development Tools MAX16974 EVAL KIT MAX16974 EVAL KIT
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX16974EVKIT+

Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX16974 is a 2A, current-mode, step-down con-
verter with an integrated high-side switch. It is designed
to operate with 3.5V to 28V input voltages, while using
only 35FA quiescent current at no load. The switching
frequency is adjustable from 220kHz to 2.2MHz by an
external resistor and can be synchronized to an external
clock. The output voltage is pin selectable to be 5V fixed
or 1V to 10V adjustable. The wide input voltage range
makes the device ideal for automotive and industrial
applications.
The device operates in skip mode for reduced current
consumption in light-load applications. An adjustable
reset threshold helps keep microcontrollers alive down to
their lowest specified input voltage. Protection features
include cycle-by-cycle current limit, overvoltage, and
thermal shutdown with automatic recovery. The device
also features a power-good monitor to ease power-
supply sequencing.
The device operates over the -40°C to +125°C auto-
motive temperature range and is available in a 16-pin
TSSOP-EP package.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
19-5630; Rev 0; 11/10
Automotive
Industrial
Down Converter with Low Operating Current
High-Voltage, 2.2MHz, 2A Automotive Step-
C
5600pF
COMP1
R
47µF
20kI
COMP
V
C
BAT
IN1
_______________________________________________________________ Maxim Integrated Products 1
4.7µF
C
IN2
General Description
C
OPEN
0.1µF
C
COMP2
C
BIAS
1µF
IN3
Applications
C
100pF
CRES
12.1kI
R
FOSC
EN
FSYNC
COMP
FOSC
BIAS
CRES
SUP
MAX16974
GND
SUPSW
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
/V Denotes an automotive qualified part.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
RESETI
MAX16974AUE/V+
Wide 3.5V to 28V Input Voltage Range
42V Input Transient Tolerance
5V Fixed or 1V to 10V Adjustable Output Voltage
Integrated 2A Internal High-Side Switch
Adjustable Switching Frequency (220kHz to
2.2MHz)
Operates Through Cold Crank with High Duty
Cycle
Frequency Synchronization Input
Internal Boost Diode
35µA Skip-Mode Operating Current
5µA Typical Shutdown Current
Adjustable Power-Good Output Level and Timing
3.3V Logic Level to 42V Compatible Enable Input
Current-Limit, Thermal-Shutdown, and
Overvoltage Protections
Automotive Temperature Range: -40°C to +125°C
AEC-Q100 Qualified
OUT
BST
RES
LX
FB
PART
0.1µF
C
BST
V
V
PLACE C
PLACE C
BIAS
OUT
Typical Application Circuit
IN2
IN4
(4.7µF) AND C
(0.1µF) AND C
C
0.1µF
IN4
10kI
R
RES
-40°C to +125°C
Ordering Information
V
TEMP RANGE
BIAS
IN3
IN5
D1
C
4.7µF
(0.1µF) NEXT TO SUP.
(4.7µF) NEXT TO SUPSW.
IN5
4.7µH
L1
5V AT 2A
V
OUT
PIN-PACKAGE
C
22µF
Features
16 TSSOP-EP*
=
OUT

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MAX16974EVKIT+ Summary of contents

Page 1

... OPEN R COMP 20kI C BIAS 1µF _______________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Wide 3.5V to 28V Input Voltage Range S 42V Input Transient Tolerance S 5V Fixed 10V Adjustable Output Voltage ...

Page 2

High-Voltage, 2.2MHz, 2A Automotive Step- Down Converter with Low Operating Current ABSOLUTE MAXIMUM RATINGS SUP, SUPSW GND .....................................-0.3V to +45V SUP to SUPSW, LX ...............................................-0.3V to +0.3V BST to GND ..........................................................-0.3V to +47V BST to LX ...............................................................-0.3V to ...

Page 3

High-Voltage, 2.2MHz, 2A Automotive Step- Down Converter with Low Operating Current ELECTRICAL CHARACTERISTICS (continued 14V 4.7FH, V SUP SUPSW 12.1kI -40NC to +125NC, unless otherwise noted. Typical values are at ...

Page 4

High-Voltage, 2.2MHz, 2A Automotive Step- Down Converter with Low Operating Current ELECTRICAL CHARACTERISTICS (continued 14V 4.7FH, V SUP SUPSW 12.1kI -40NC to +125NC, unless otherwise noted. Typical values are at ...

Page 5

High-Voltage, 2.2MHz, 2A Automotive Step- Down Converter with Low Operating Current ( 14V 5V, FSYNC = GND, f SUP SUPSW OUT LOAD TRANSIENT V OUT I LOAD RESET TIMEOUT PERIOD vs. C 100 90 80 ...

Page 6

High-Voltage, 2.2MHz, 2A Automotive Step- Down Converter with Low Operating Current ( 14V 5V, FSYNC = GND, f SUP SUPSW OUT SWITCHING FREQUENCY vs. R 2.8 2.4 2.0 1.6 1.2 0.8 0 ...

Page 7

High-Voltage, 2.2MHz, 2A Automotive Step- Down Converter with Low Operating Current ( 14V 5V, FSYNC = GND, f SUP SUPSW OUT OUTPUT RESPONSE TO SLOW INPUT RAMP UP (5V/400kHz LOAD V SUP ...

Page 8

High-Voltage, 2.2MHz, 2A Automotive Step- Down Converter with Low Operating Current V BAT IN1 IN2 IN3 47µF 4.7µF 0.1µF C COMP1 5600pF C COMP2 OPEN R COMP 20kI C BIAS 1µF C CRES Figure 1. 3.3V Fixed ...

Page 9

High-Voltage, 2.2MHz, 2A Automotive Step- Down Converter with Low Operating Current PIN NAME Analog Reset Timer. CRES sources 10FA (typ) of current into an external capacitor to set the reset 1 CRES timeout period. Reset timeout period is defined as ...

Page 10

High-Voltage, 2.2MHz, 2A Automotive Step- Down Converter with Low Operating Current Detailed Description The MAX16974 is a constant-frequency, current-mode, automotive buck converter with an integrated high-side switch. The device operates with 3.5V to 28V input volt- ages and tolerates input ...

Page 11

High-Voltage, 2.2MHz, 2A Automotive Step- Down Converter with Low Operating Current Linear Regulator Output (BIAS) The device includes a 5V linear regulator, V provides power to the internal circuitry. Connect a 1FF ceramic capacitor from BIAS to GND. If the ...

Page 12

High-Voltage, 2.2MHz, 2A Automotive Step- Down Converter with Low Operating Current During light-load operation, I INDUCTOR device enters skip-mode operation. Skip mode turns off the internal switch and allows the output to drop below regulation voltage before the switch is ...

Page 13

High-Voltage, 2.2MHz, 2A Automotive Step- Down Converter with Low Operating Current SWITCHING FREQUENCY vs. R 2.8 2.4 2.0 1.6 1.2 0.8 0 FOSC Figure 4. Switching ...

Page 14

High-Voltage, 2.2MHz, 2A Automotive Step- Down Converter with Low Operating Current Table 1. Inductor Size Comparison INDUCTOR SIZE SMALLER Lower price Smaller form factor Larger fixed-frequency Faster load response range in skip mode Table 1 shows a comparison between small ...

Page 15

High-Voltage, 2.2MHz, 2A Automotive Step- Down Converter with Low Operating Current When using low-capacity filter capacitors, such as ceramic capacitors, size is usually determined by the capacity needed to prevent V SAG ing problems during load transients. Generally, once enough ...

Page 16

High-Voltage, 2.2MHz, 2A Automotive Step- Down Converter with Low Operating Current the voltage drop across the high-side MOSFET. Current- mode control eliminates the double pole in the feedback loop caused by the inductor and output capacitor result- ing in a ...

Page 17

High-Voltage, 2.2MHz, 2A Automotive Step- Down Converter with Low Operating Current The total loop gain as the product of the modulator gain, the feedback voltage-divider gain, and the error amplifier gain at f should be equal to 1. So: C ...

Page 18

High-Voltage, 2.2MHz, 2A Automotive Step- Down Converter with Low Operating Current 4) Keep the power traces and load connections short. This practice is essential for high efficiency. Use thick cop- per PCBs (2oz vs. 1oz) to enhance full-load efficiency. 5) ...

Page 19

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 2010 Maxim Integrated Products © ...

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