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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX16935 Datasheet

2.2MHz Step-Down Converters

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MAX16935/MAX16939
EVALUATION KIT AVAILABLE
36V, 3.5A, 2.2MHz Step-Down Converters
with 28µA Quiescent Current
General Description
The MAX16935/MAX16939 are 3.5A current-mode step-
down converters with integrated high-side and low-
side MOSFETs designed to operate with an external
Schottky diode for better efficiency. The low-side MOSFET
enables fixed-frequency forced-PWM (FPWM) operation
under light-load applications. The devices operate with
input voltages from 3.5V to 36V, while using only 28FA
quiescent current at no load. The switching frequency is
resistor programmable from 220kHz to 2.2MHz and can
be synchronized to an external clock. The devices’ output
voltage is available as 3.3V/5V fixed or adjustable from
1V to 10V. The wide input voltage range along with its
ability to operate at 98% duty cycle during undervoltage
transients make the devices ideal for automotive and
industrial applications.
Under light-load applications, the FSYNC logic input
allows the devices to either operate in skip mode for
reduced current consumption or fixed-frequency FPWM
mode to eliminate frequency variation to minimize
EMI. Fixed-frequency FPWM mode is extremely use-
ful for power supplies designed for RF transceivers
where tight emission control is necessary. Protection
features include cycle-by-cycle current limit and thermal
shutdown with automatic recovery. Additional features
include a power-good monitor to ease power-supply
sequencing and a 180N out-of-phase clock output relative
to the internal oscillator at SYNCOUT to create cascaded
power supplies with multiple devices.
The MAX16935/MAX16939 operate over the -40NC
to +125NC automotive temperature range and are
available in 16-pin (5mm x 5mm) TQFN-EP and 16-pin
TSSOP-EP packages.
Applications
● Point-of-Load Applications
● Distributed DC Power Systems
● Navigation and Radio Head Units
Benefits and Features
● Integration and High-Switching Frequency Saves
Space
• Integrated 3.5A High-Side Switch
• Low-BOM-Count Current-Mode Control
Architecture
• Fixed Output Voltage with ±2% Accuracy or
Externally Resistor Adjustable (1V to 10V)
• 220kHz to 2.2MHz Switching Frequency with
Three Operation Modes (Skip Mode, Forced
Fixed-Frequency Operation, and External
Frequency Synchronization)
• Automatic LX Slew-Rate Adjustment for Optimum
Efficiency Across Operating Frequency Range
● 180° Out-of-Phase Clock Output at SYNCOUT
Enables Cascaded Power Supplies for Increased
Power Output
● Spread-Spectrum Frequency Modulation Reduces
EMI Emissions
● Wide Input Voltage Range Supports Automotive
Applications
• 3.5V to 36V Input Voltage Range (42V Tolerant)
• Enable Input Compatible from 3.3V Logic Level
to 42V
● Robust Performance Supports Wide Range of
Automotive Applications
• -40°C to +125°C Automotive Temperature Range
• Thermal-Shutdown Protection
AEC-Q100 Qualified
● Power-Good Output Allows Power-Supply
Sequencing
● Tight Overvoltage Protection Provides Smaller
Overshoot Voltages (MAX16939)
Ordering Information/Selector Guide and Typical
Application Circuit appear at end of data sheet.
19-6868; Rev 17; 1/18


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX16935 Datasheet

2.2MHz Step-Down Converters

No Preview Available !

MAX16935/MAX16939
36V, 3.5A, 2.2MHz Step-Down Converters
with 28µA Quiescent Current
Absolute Maximum Ratings
SUP, SUPSW, EN to PGND....................................-0.3V to +42V
LX (Note 1).............................................................-0.3V to +42V
SUP to SUPSW......................................................-0.3V to +0.3V
BIAS to AGND..........................................................-0.3V to +6V
SYNCOUT, FOSC, COMP, FSYNC,
PGOOD, FB to AGND......................... -0.3V to (VBIAS + 0.3V)
OUT to PGND.........................................................-0.3V to +12V
BST to LX (Note 1)...................................................-0.3V to +6V
AGND to PGND....................................................-0.3V to + 0.3V
LX Continuous RMS Current.................................................3.5A
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation (TA = +70NC)*
TQFN (derate 28.6mW/NC above +70NC)...............2285.7mW
TSSOP (derate 26.1mW/NC above +70NC).............2088.8mW
Operating Temperature Range..................... -40NC to +125NC
Junction Temperature......................................................+150NC
Storage Temperature Range............................. -65NC to +150NC
Lead Temperature (soldering, 10s).................................+300NC
Soldering Temperature (reflow).......................................+260NC
*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 opera-
tion 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 2)
TQFN
Junction-to-Ambient Thermal Resistance (BJA)...........35NC/W
Junction-to-Case Thermal Resistance (BJC)...............2.7NC/W
TSSOP
Junction-to-Ambient Thermal Resistance (BJA)........38.3NC/W
Junction-to-Case Thermal Resistance (BJC)..................3NC/W
Note 1: Self-protected against transient voltages exceeding these limits for ≤ 50ns under normal operation and loads up to the maxi-
mum rated output current.
Note 2: 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 = VSUPSW = 14V, VEN = 14V, L1 = 2.2FH, CIN = 4.7FF, COUT = 22FF, CBIAS = 1FF, CBST = 0.1FF, RFOSC = 12kI,
TA = TJ = -40NC to +125NC, unless otherwise noted. Typical values are at TA = +25NC.)
PARAMETER
Supply Voltage
Load-Dump Event Supply
Voltage
Supply Current
Shutdown Supply Current
BIAS Regulator Voltage
BIAS Undervoltage Lockout
BIAS Undervoltage-Lockout
Hysteresis
Thermal-Shutdown Threshold
Thermal-Shutdown Threshold
Hysteresis
SYMBOL
VSUP, VSUPSW
CONDITIONS
VSUP_LD
tLD < 1s
ISUP_STANDBY
ISHDN
VBIAS
VUVBIAS
Standby mode, no
load, VOUT = 5V,
VFSYNC = 0V
Standby mode, no
load, VOUT = 3.3V,
VFSYNC = 0V
MAX16935/39
MAX16935C
MAX16935/39
MAX16935C
VEN = 0V
VSUP = VSUPSW = 6V to 42V,
IBIAS = 0 to 10mA
VBIAS rising
MIN
3.5
4.7
2.95
TYP
28
32
22
23
5
5
3.15
450
+175
15
MAX
36
42
UNITS
V
V
40
45
FA
35
36
10 FA
5.4 V
3.40
V
650 mV
NC
NC
www.maximintegrated.com
Maxim Integrated 2


Part Number MAX16935
Description 2.2MHz Step-Down Converters
Maker Maxim Integrated
PDF Download

MAX16935 Datasheet PDF






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