19-5630; Rev 1; 7/11
High-Voltage, 2.2MHz, 2A Automotive Step-
Down Converter with Low Operating Current
General Description
Features
SꢀWide_3.5V_to_28V_Input_Voltage_Range
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.
Sꢀ42V_Input_Transient_Tolerance
Sꢀ5V_Fixed_or_1V_to_10V_Adjustable_Output_Voltage
SꢀIntegrated_2A_Internal_High-Side_Switch
SꢀAdjustable_Switching_Frequency_(220kHz_to_
2.2MHz)
SꢀOperates_Through_Cold_Crank_with_High_Duty_
Cycle
SꢀFrequency_Synchronization_Input
SꢀInternal_Boost_Diode
Sꢀ35µA_Skip-Mode_Operating_Current
Sꢀ5µA_Typical_Shutdown_Current
SꢀAdjustable_Power-Good_Output_Level_and_Timing
Sꢀ3.3V_Logic_Level_to_42V_Compatible_Enable_Input
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.
SꢀCurrent-Limit,_Thermal-Shutdown,_and_
Overvoltage_Protections
SꢀAutomotive_Temperature_Range:_-40°C_to_+125°C
SꢀAEC-Q100_Qualified
The device operates over the -40°C to +125°C auto-
motive temperature range and is available in a 16-pin
TSSOP-EP package.
Ordering Information
PART
TEMP_RANGE
PIN-PACKAGE
Applications
MAX16974AUE/V+
-40NC to +125NC
16 TSSOP-EP*
Automotive
Industrial
/V Denotes an automotive qualified part.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Application Circuit
V
BAT
C
IN1
C
IN2
C
IN3
C
C
C
IN5
BST
IN4
47µF
4.7µF
0.1µF
0.1µF
0.1µF
4.7µF
SUP
SUPSW
L1
4.7µH
V
=
BST
LX
OUT
EN
5V AT 2A
FSYNC
COMP
C
V
OUT
OUT
D1
22µF
OUT
C
COMP1
5600pF
MAX16974 RESETI
V
BIAS
R
FOSC
C
COMP2
V
BIAS
12.1kI
OPEN
R
COMP
FB
R
RES
10kI
FOSC
BIAS
20kI
RES
C
BIAS
1µF
CRES
C
100pF
CRES
GND
PLACE C (4.7µF) AND C (0.1µF) NEXT TO SUP.
IN2
IN3
PLACE C (0.1µF) AND C (4.7µF) NEXT TO SUPSW.
IN4
IN5
_ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ _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.