MAX16955_12 Datasheet, PDF (1/26 Pages) Maxim Integrated Products – 36V, 1MHz Step-Down Controller with Low Operating Current

EVALUATION KIT AVAILABLE
MAX16955
36V, 1MHz Step-Down Controller
with Low Operating Current
General Description
The MAX16955 is a current-mode, synchronous PWM
step-down controller designed to operate with input volt-
ages from 3.5V to 36V while using only 50µA of quies-
cent current at no load. The switching frequency is
adjustable from 220kHz to 1MHz by an external resistor
and can be synchronized to an external clock up to
1.1MHz. The MAX16955 output voltage is pin program-
mable to be either 5V fixed, or adjustable from 1V to
10V. The wide input voltage range, along with its ability
to operate in dropout during undervoltage transients,
makes it ideal for automotive and industrial applications.
The MAX16955 operates in fixed-frequency PWM mode
and low quiescent current skip mode. It features an
enable logic input, which is compatible up to 42V to
disable the device and reduce its shutdown current to
10µA. Protection features include overcurrent limit,
overvoltage, undervoltage, and thermal shutdown with
automatic recovery. The device also features a power-
good monitor to ease power-supply sequencing.
The MAX16955 is available in a thermally enhanced 16-
pin TSSOP package with exposed pad and is specified
for operation over the -40°C to +125°C automotive tem-
perature range.
Applications
Automotive
Industrial
Military
Point of Load
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX16955AUE/V+ -40°C to +125°C
16 TSSOP-EP*
/V denotes an automotive qualified part.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Features
o Wide 3.5V to 36V Input Voltage Range
o 42V Input Transient Tolerance
o High Duty Cycle During Undervoltage Transients
o 220kHz to 1MHz Adjustable Switching Frequency
o Current-Mode Control Architecture
o Adjustable (1V to 10V) Output Voltage with ±2%
Accuracy
o Three Operating Modes
50µA Ultra-Low Quiescent Current Skip Mode
Forced Fixed-Frequency Mode
External Frequency Synchronization
o Lowest BOM Count, Current-Mode Control
Architecture
o Power-Good Output
o Enable Input Compatible from 3.3V Logic Level to
42V
o Current-Limit, Thermal Shutdown, and
Overvoltage Protection
o -40°C to +125°C Automotive Temperature Range
o Automotive Qualified
Typical Operating Circuit
VBAT
CIN
RCOMP _CCOMP2
CCOMP1
SUP
COMP
DH
CBST
BST
LX
MAX16955
NH
L
RFOSC
PGOOD
EN
FSYNC
FOSC
SGND
DL
PGND
CS
OUT
FB
BIAS
NL
RSENSE
COUT
VOUT
5V
CL
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-5781; Rev 1; 9/12