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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX16955 Datasheet

1MHz Step-Down Controller

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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+
-40°C to +125°C
16 TSSOP-EP*
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
BST
LX
MAX16955
CBST
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.
19-5791; Rev 4; 7/14


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX16955 Datasheet

1MHz Step-Down Controller

No Preview Available !

MAX16955
36V, 1MHz Step-Down Controller
with Low Operating Current
ABSOLUTE MAXIMUM RATINGS
SUP and EN to SGND ............................................-0.3V to +42V
LX to PGND ..............................................................-1V to +42V
BST to LX .................................................................-0.3V to +6V
BIAS, FB, PGOOD, FSYNC to SGND .......................-0.3V to +6V
DH to LX ...................................................................-0.3V to +6V
DL to PGND .............................................-0.3V to (VBIAS + 0.3V)
FOSC to SGND ........................................-0.3V to (VBIAS + 0.3V)
CS and OUT to SGND ............................................-0.3V to +11V
PGND to SGND .....................................................-0.3V to +0.3V
Continuous Power Dissipation (TA = +70°C)
TSSOP (derate 26.1mW/°C above +70°C) .............2088.8mW*
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
*As per JEDEC51 standard (multilayer board).
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
TSSOP
Junction-to-Ambient Thermal Resistance (θJA) .........38.3°C/W
Junction-to-Case Thermal Resistance (θJC) ...................3°C/W
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
ELECTRICAL CHARACTERISTICS
(VSUP = VEN = 14V, CIN = 10μF, COUT = 94μF, CBIAS = 2.2μF, CBST = 0.1μF, RFOSC = 76.8kΩ, TA = TJ = -40°C to +125°C, unless
otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
SUP Input Voltage Range
SUP Operating Supply Current
Skip Mode Supply Current
SUP Shutdown Supply Current
BIAS Voltage
BIAS Undervoltage Lockout
BIAS Undervoltage Lockout
Hysteresis
VSUP
ISUP
ISKIP
ISHDN,SUP
VBIAS
VUVBIAS
(Note 3)
Fixed 5V output, fixed-frequency, PWM
mode, VFB = VBIAS, no external FETs
connected
No load, fixed 5V output
VEN = 0V
VSUP = 3.5V, IBIAS = 45mA
6V < VSUP < 36V
VBIAS rising
VBIAS falling
3.5 36 V
1 mA
50 90 μA
10 20 μA
3.0
4.7 5.0 5.3
V
3.1 3.4
V
200 mV
BIAS Minimum Load
OUTPUT VOLTAGE (OUT)
IBIAS(MIN) VSUP - VBIAS > 200mV
45 mA
Output Voltage Adjustable
Range
1.0 10 V
OUT Pulldown Resistance
Output Voltage (5V Fixed Mode)
RPULL_D
VOUT
VEN = 0V or fault condition active
VSUP = 6V to 36V, VFB = VBIAS, fixed-
frequency mode (Note 4)
30
4.925 5.0 5.075

V
FB Feedback Voltage
(Adjustable Mode)
VFB
VSUP = 6V to 36V, 0V < (VCS - VOUT)
< 80mV, fixed-frequency mode
0.99 1.0 1.01
V
FB Current
IFB VFB = 1.0V
0.02
μA
2 Maxim Integrated


Part Number MAX16955
Description 1MHz Step-Down Controller
Maker Maxim Integrated
PDF Download

MAX16955 Datasheet PDF






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