MAX16975 Datasheet, PDF (1/17 Pages) Maxim Integrated Products – 28V, 1.2A Automotive Step-Down Converter with Low Operating Current

19-5673; Rev 0; 3/11
MAX16975
28V, 1.2A Automotive Step-Down Converter
with Low Operating Current
General Description
The MAX16975 is a 1.2A current-mode step-down con-
verter with an integrated high-side switch. The device
operates with input voltages from 3.5V to 28V while using
only 45FA quiescent current at no load. The switching
frequency is adjustable from 220kHz to 1.0MHz by using
an external resistor, and can be synchronized to an exter-
nal clock. The device’s output voltage is pin-selectable to
a fixed 5V or adjustable from 1V to 10V using external
resistors. 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 conditions. An adjustable
reset threshold helps keep microcontrollers alive down
to the lowest specified input voltage. Protection features
include cycle-by-cycle current limit, soft-start, overvolt-
age, 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 automo-
tive temperature range, and is available in 16-pin QSOP
and QSOP-EP packages.
Ordering Information appears at end of data sheet.
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 1.2A High-Side Switch
S 220kHz to 1.0MHz Adjustable Switching Frequency
S Frequency Synchronization Input
S Internal Boost Diode
S 45µA Skip-Mode Operating Current
S Less than 10µA 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 Protection
S -40°C to +125°C Automotive Temperature Range
Applications
Automotive
Industrial
Typical Application Circuit
3.5V TO 28V
CIN1
CIN2
47µF
4.7µF
C_COMP1
5600pF
RCOMP
12kI
CCOMP2
OPEN
C_BIAS
1µF
CIN3
0.1µF
RFOSC
61.9kI
SUP
EN
FSYNC
SUPSW
BST
LX
COMP
OUT
MAX16975 RESETI
FOSC
FB
CCRES
1nF
BIAS
RES
CRES
GND
CBST
0.1µF
VOUT
L1
10µH
D1
V_BIAS
RRES
10kI
V_OUT = 1.25V AT
1.2A AT 400kHz
RFB1
25kI
COUT1
47µF
COUT2
47µF
RFB2
100kI
PLACE CIN3 (0.1µF) RIGHT NEXT TO SUP.
For related parts and recommended products to use with this part, refer to: www.maxim-ic.com/MAX16975.related
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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.