MAX15026 반도체 회로 부품 판매점
DC-DC Synchronous Buck Controller
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 Maxim Integrated Products |
19-4108; Rev 0; 5/08
EVAALVUAAILTAIOBNLEKIT
Low-Cost, Small, 4.5V to 28V Wide Operating
Range, DC-DC Synchronous Buck Controller
www.datasheet4u.com
General Description
The MAX15026 synchronous step-down controller oper-
ates from a 4.5V to 28V input voltage range and gener-
ates an adjustable output voltage from 85% of the input
voltage down to 0.6V while supporting loads up to 25A.
The device allows monotonic startup into a prebiased
bus without discharging the output and features adap-
tive internal digital soft-start.
The MAX15026 offers the ability to adjust the switching
frequency from 200kHz to 2MHz with an external resis-
tor. The MAX15026’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 resis-
tor. This protects the DC-DC components from damage
during output overloaded conditions or output short-
circuit faults without requiring a current-sense resistor.
Hiccup-mode current limit reduces power dissipation
during short-circuit conditions. The MAX15026 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 for power sequencing.
Additional protection features include sink-mode cur-
rent limit and thermal shutdown.
Sink-mode current limit prevents reverse inductor cur-
rent from reaching dangerous levels when the device is
sinking current from the output.
The MAX15026 is available in a space-saving and ther-
mally enhanced 3mm x 3mm, 14-pin TDFN-EP pack-
age. The MAX15026 operates over the -40°C to +85°C
temperature range.
Applications
Set-Top Boxes
LCD TV Secondary Supplies
Switches/Routers
Power Modules
DSP Power Supplies
Points-of-Load Regulators
Features
♦ 4.5V to 28V or 5V ±10% Input Supply Range
♦ 0.6V to (0.85 x VIN) Adjustable Output
♦ Adjustable 200kHz to 2MHz Switching Frequency
♦ Ability to Start into a Prebiased Load
♦ Lossless, Cycle-by-Cycle Valley Mode Current
Limit with Adjustable, Temperature-Compensated
Threshold
♦ Sink-Mode Current-Limit Protection
♦ Adaptive Internal Digital Soft-Start
♦ ±1% Accurate Voltage Reference
♦ Internal Boost Diode
♦ Adaptive Synchronous Rectification Eliminates
External Freewheeling Schottky Diode
♦ Hiccup-Mode Short-Circuit Protection
♦ Thermal Shutdown
♦ Power-Good Output and Enable Input for Power
Sequencing
♦ ±5% Accurate Enable Input Threshold
Ordering Information
PART
TEMP RANGE
MAX15026BETD+ -40°C to +85°C
+Denotes a lead-free package.
*EP = Exposed pad.
PIN-PACKAGE
14 TDFN-EP*
Pin Configuration
TOP VIEW
IN 1
VCC 2
PGOOD 3
EN 4
LIM 5
COMP 6
FB 7
+
MAX15026
*EP
14 DH
13 LX
12 BST
11 DL
10 DRV
9 GND
8 RT
*EP = EXPOSED PAD.
TDFN
(3mm x 3mm)
________________________________________________________________ Maxim Integrated Products 1
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.
Low-Cost, Small, 4.5V to 28V Wide Operating
Range, DC-DC Synchronous Buck Controller
www.daAtasBheSeOt4uL.cUomTE MAXIMUM RATINGS
IN to GND ...............................................................-0.3V to +30V
BST to GND ............................................................-0.3V to +36V
LX to GND .................................................................-1V to +30V
EN to GND................................................................-0.3V to +6V
PGOOD to GND .....................................................-0.3V to +30V
BST to LX..................................................................-0.3V to +6V
DH to LX ...............................................….-0.3V to (VBST + 0.3V)
DRV to GND .............................................................-0.3V to +6V
DL to GND ................................................-0.3V to (VDRV + 0.3V)
VCC to GND ...............-0.3V to the lower of +6V and (VIN + 0.3V)
All Other Pins to GND.................................-0.3V to (VCC + 0.3V)
VCC Short Circuit to GND ...........................................Continuous
DRV Input Current.............................................................600mA
PGOOD Sink Current ............................................................5mA
Continuous Power Dissipation (TA = +70°C) (Note 1)
14-Pin TDFN-EP, Multilayer Board
(derate 24.4mW/°C above +70°C) ..............................1951mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: Dissipation wattage values are based on still air with no heatsink. Actual maximum power dissipation is a function of heat
extraction technique and may be substantially higher. 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 consid-
erations, refer to www.maxim-ic.com/thermal-tutorial.
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.
ELECTRICAL CHARACTERISTICS
(VIN = 12V, RRT = 27kΩ, RLIM = 30kΩ, CVCC = 4.7µF, CIN = 1µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
GENERAL
Input Voltage Range
Quiescent Supply Current
Shutdown Supply Current
Enable to Output Delay
VIN
IIN_SBY
VIN = VCC = VDRV
VFB = 0.9V, no switching
EN = GND
4.5 28
4.5 5.5
1.75 2.75
290 500
480
V
mA
µA
µs
VCC High to Output Delay
VCC REGULATOR
Output Voltage
VCC Regulator Dropout
VCC Short-Circuit Output Current
VCC Undervoltage Lockout
VCC Undervoltage Lockout
Hysteresis
EN = VCC
VCC
VCC_UVLO
6V < VIN < 28V, ILOAD = 25mA
VIN = 12V, 1mA < ILOAD < 70mA
VIN = 4.5V, ILOAD = 70mA
VIN = 5V
VCC rising
375 µs
5.0 5.25 5.5
0.28
100 200 300
3.8 4.0 4.2
400
V
V
mA
V
mV
ERROR AMPLIFIER (FB, COMP)
FB Input Voltage Set-Point
FB Input Bias Current
FB to COMP Transconductance
Amplifier Open-Loop Gain
Amplifier Unity-Gain Bandwidth
VCOMP-RAMP Minimum Voltage
COMP Source/Sink Current
VFB
IFB
gM
ICOMP
VFB = 0.6V
ICOMP = ±20µA
Capacitor from COMP to GND = 50pF
VCOMP = 1.4V
582
-250
600
50
592
1200
80
4
160
80
597
+250
1800
110
mV
nA
µS
dB
MHz
mV
µA
2 _______________________________________________________________________________________
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제조업체: Maxim Integrated Products
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MAX15026 controller
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