MAX16974 Datasheet, PDF (1/19 Pages) Maxim Integrated Products – High-Voltage, 2.2MHz, 2A Automotive Step- Down Converter with Low Operating Current

19-5630; Rev 1; 7/11
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High-Voltage, 2.2MHz, 2A Automotive Step-
Down Converter with Low Operating Current
General Description
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.
Automotive
Industrial
Applications
Features
S Wide 3.5V to 28V Input Voltage Range
S 42V Input Transient Tolerance
S 5V Fixed or 1V to 10V Adjustable Output Voltage
S Integrated 2A Internal High-Side Switch
S Adjustable Switching Frequency (220kHz to
2.2MHz)
S Operates Through Cold Crank with High Duty
Cycle
S Frequency Synchronization Input
S Internal Boost Diode
S 35µA Skip-Mode Operating Current
S 5µA Typical Shutdown Current
S Adjustable Power-Good Output Level and Timing
S 3.3V Logic Level to 42V Compatible Enable Input
S Current-Limit, Thermal-Shutdown, and
Overvoltage Protections
S Automotive Temperature Range: -40°C to +125°C
S AEC-Q100 Qualified
Ordering Information
PART
MAX16974AUE/V+
TEMP RANGE PIN-PACKAGE
-40NC to +125NC 16 TSSOP-EP*
/V Denotes an automotive qualified part.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Application Circuit
VBAT
C_IN1
47µF
CCOMP1
5600pF
RCOMP
20kI
CIN2
4.7µF
CIN3
0.1µF
C_COMP2
OPEN
R_FOSC
12.1kI
CBIAS
1µF
CCRES
100pF
CBST
0.1µF
EN ^{SUP SUPSW} BST
FSYNC
LX
COMP
OUT
MAX16974 RESETI
FOSC
FB
VOUT
VBIAS
BIAS
RES
CIN4
0.1µF
CIN5
4.7µF
L1
4.7µH
D1
VBIAS
RRES
10kI
VOUT =
5V AT 2A
COUT
22µF
CRES
GND
PLACE CIN2 (4.7µF) AND CIN3 (0.1µF) NEXT TO SUP.
PLACE CIN4 (0.1µF) AND CIN5 (4.7µF) NEXT TO SUPSW.
________________________________________________________________ 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.