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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX15046 Datasheet

40V High-Performance Synchronous Buck Controller

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MAX15046
EVALUATION KIT AVAILABLE
40V, High-Performance, Synchronous
Buck Controller
General Description
The MAX15046 synchronous step-down controller oper-
ates from a 4.5V to 40V input voltage range and gener-
ates an adjustable output voltage from 85% of the input
voltage down to 0.6V, supporting loads up to 25A. The
device allows monotonic startup into a prebiased bus
without discharging the output and features adaptive
internal digital soft-start.
The MAX15046 offers the ability to adjust the switching fre-
quency from 100kHz to 1MHz with an external resistor. The
MAX15046’s adaptive synchronous rectification eliminates
the need for an external freewheeling Schottky diode.
The device also utilizes the external low-side MOSFET’s
on-resistance as a current-sense element, eliminating the
need for a current-sense resistor. This protects the DC-DC
components from damage during output overloaded con-
ditions or output short-circuit faults without requiring a
current-sense resistor. Hiccup-mode current limit reduc-
es power dissipation during short-circuit conditions. The
MAX15046 includes a power-good output and an enable
input with precise turn-on/turn-off threshold, which can be
used for input supply monitoring and power sequencing.
Additional protection features include sink-mode current
limit and thermal shutdown. Sink-mode current limit pre-
vents reverse inductor current from reaching dangerous
levels when the device is sinking current from the output.
The MAX15046A/MAX15046B feature soft-stop opera-
tion. Soft-stop operation is disabled in the MAX15046C.
The MAX15046 is available in a 16-pin QSOP or 16-pin
QSOP-EP package and operates over the -40°C to
+125°C temperature range.
Typical Operating Circuit
Features
● Input Voltage Ranges from 4.5V to 40V or 5V ±10%
● Adjustable Outputs from 0.85 x VIN Down to 0.6V
● Adjustable Switching Frequency (100kHz to 1MHz)
with ±10% (1MHz) Accuracy
● Adaptive Internal Digital Soft-Start
● Up to 25A Output Capability
● Cycle-by-Cycle Valley-Mode Current Limit with
Adjustable, Temperature-Compensated Threshold
(30mV to 300mV)
● Monotonic Startup into Prebiased Output
● ±1% Accurate Voltage Reference
● 90% Maximum Duty Cycle (MAX15046C)
● 3A Peak Gate Drivers
● Hiccup-Mode Short-Circuit Protection
● Overtemperature Shutdown
● Power-Good (PGOOD) Output and Enable Input
(EN) with ±5% Accurate Threshold
● Thermally Enhanced 16-Pin QSOP Package
Applications
● Industrial Power Supplies (PLC, Industrial Computers,
Fieldbus Components, Fieldbus Couplers)
● Telecom Power Supplies
● Base Stations
Ordering Information and Pin Configurations appear at end
of data sheet.
4.5V TO 40V
VIN
ON
OFF
R4
C1
C5 R3
C6
C7
R1 R3
IN CSP
MAX15046
VCC DH
PGOOD
LX
EN BST
LIM DL
COMP
DRV
FB PGND
RT GND
R2
C2
D1
C4
R5
Q1
L1
Q2
0.6V TO 0.85V x VIN
VOUT
C3
19-4719; Rev 3; 6/14


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX15046 Datasheet

40V High-Performance Synchronous Buck Controller

No Preview Available !

MAX15046
40V, High-Performance, Synchronous
Buck Controller
Absolute Maximum Ratings
IN to GND...............................................................-0.3V to +45V
VCC to GND..................... -0.3V to lower of (VIN + 0.6V) and 6V
EN, DRV to GND......................................................-0.3V to +6V
PGOOD to GND.....................................................-0.3V to +45V
PGND to GND.......................................................-0.3V to +0.3V
DL to PGND............................................ -0.3V to (VDRV + 0.3V)
BST to PGND ........................................................-0.3V to +50V
LX and CSP to PGND...............................................-1V to +45V
LX and CSP to PGND............................-2V (50ns max) to +45V
BST to LX.................................................................-0.3V to +6V
CSP to LX..............................................................-0.3V to +0.3V
DH to LX...................................................-0.3V to (VBST + 0.3V)
All Other Pins to GND............................... -0.3V to (VCC + 0.3V)
VCC Short Circuit to GND..........................................Continuous
PGOOD Maximum Sink Current.........................................20mA
Continuous Power Dissipation (TA = +70°C):
16-Pin QSOP (derate 9.6mW/°C above +70°C)........771.5mW
16-Pin QSOP-EP
(derate 22.7mW/°C above +70°C)..........................1818.2mW
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
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)
QSOP
Junction-to-Ambient Thermal Resistance (θJA)......+103.7°C/W
Junction-to-Case Thermal Resistance (θJC)................+37°C/W
QSOP-EP
Junction-to-Ambient Thermal Resistance (θJA)...........+44°C/W
Junction-to-Case Thermal Resistance (θJC)..................+6°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
(VIN = 24V, VEN = 5V, VGND = VPGND = 0V, CIN = 1µF, CVCC = 4.7µF, RRT = 49.9kΩ, TA = TJ = -40°C to +125°C, unless otherwise
noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYSTEM SPECIFICATIONS
Input-Voltage Range
Quiescent Supply Current
Shutdown Supply Current
VCC REGULATOR
Output Voltage
VCC Regulator Dropout
VCC Short-Circuit Output Current
VCC Undervoltage Lockout
VCC Undervoltage Lockout
Hysteresis
ERROR AMPLIFIER (FB, COMP)
FB Input-Voltage Set Point
FB Input Bias Current
FB to COMP Transconductance
Open-Loop Gain
Unity-Gain Bandwidth
SYMBOL
VIN
IIN_Q
IIN_SBY
VCC
VCCUVLO
VFB
IFB
gM
CONDITIONS
MIN
VIN = VCC = VDRV
VIN = 24V, VFB = 0.9V, no switching
VIN = 24V, VEN = 0V, IVCC = 0, PGOOD
= unconnected
4.5
4.5
6V ≤ VIN ≤ 40V, ILOAD = 6mA
VIN = 4.5V, ILOAD = 25mA
VIN = 5V
VCC rising
5
30
3.8
VFB = 0.6V
ICOMP = ±20µA
Capacitor from COMP to GND = 47pF
584
-250
600
TYP
2
0.35
5.25
0.18
55
4
400
590
1200
80
5
MAX UNITS
40
5.5
3
0.55
V
mA
mA
5.5
0.45
90
4.2
V
V
mA
V
mV
596
+250
1800
mV
nA
µS
dB
MHz
www.maximintegrated.com
Maxim Integrated 2


Part Number MAX15046
Description 40V High-Performance Synchronous Buck Controller
Maker Maxim Integrated Products
PDF Download

MAX15046 Datasheet PDF






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