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PDF MAX15035 Data sheet ( Hoja de datos )
| Número de pieza | MAX15035 | |
| Descripción | 15A Step-Down Regulator | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-4123; Rev 2; 10/08
15A Step-Down Regulator with Internal Switches
General Description
The MAX15035 pulse-width modulation (PWM) controller
provides high efficiency, excellent transient response,
and high DC-output accuracy. Combined with the inter-
nal low on-resistance MOSFETs, the MAX15035 pro-
vides a highly efficient and compact solution for small
form factor applications that need a high-power density.
Maxim’s proprietary Quick-PWM™ quick-response,
constant on-time PWM control scheme handles wide
input/output voltage ratios (low-duty-cycle applications)
with ease and provides 100ns instant-on response to
load transients while maintaining a relatively constant
switching frequency. The output voltage can be dynam-
ically controlled using the dynamic REFIN, which sup-
ports input voltages between 0V to 2V. The REFIN
adjustability combined with a resistive voltage-divider
on the feedback input allows the MAX15035 to be con-
figured for any output voltage between 0V to 0.9VIN.
The controller senses the current across the synchro-
nous rectifier to achieve a low-cost and highly efficient
valley current-limit protection. External current-limit con-
trol is provided to allow higher current-limit settings for
applications with heatsinks and air flow, or for lower
current applications that need lower current-limit set-
tings to avoid overdesigning the application circuit. The
adjustable current limit provides a high degree of flexi-
bility, allowing thermally compensated protection or
foldback current-limit protection using a voltage-divider
partially derived from the output.
The MAX15035 includes a voltage-controlled soft-start
and soft-shutdown to limit the input surge current, pro-
vide a monotonic power-up into a precharged output,
and provide a predictable soft-start time. The controller
also includes output fault protection—undervoltage and
overvoltage protection—as well as thermal-fault protec-
tion.
The MAX15035 is available in a small 40-pin, 6mm x 6mm,
TQFN package.
Applications
Server Computers
GPU Core Supplies
DDR Memory—VDDQ or VTT
Point-of-Load Applications
Step-Down Power Supplies
Storage Power Supplies
Features
o 4.5V to 26V Input Voltage Range
o Fast Transient Response
o Monotonic Power-Up with Precharged Output
o Supports Any Output Capacitor
No Compensation Required with Polymers/
Tantalum
Stable with Ceramic Output Capacitors Using
External Compensation
o Dynamically Adjustable Output Voltage
0.5% VOUT Accuracy Over Line and Load
o Adjustable Valley Current-Limit Protection
Thermal Compensation with NTC
Supports Foldback Current Limit
o Programmable Switching Frequency
o Overvoltage Protection
o Undervoltage Protection
o Voltage Soft-Start and Soft-Shutdown
o Power-Good Window Comparator
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX15035ETL+
-40°C to +85°C
40 TQFN-EP*
+Denotes a lead-free/RoHS-compliant package.
*EP = Exposed pad.
Pin Configuration
TOP VIEW
30 29 28 27 26 25 24 23 22 21
N.C. 31
FB 32
EP1 EP3
IN
20 IN
19 IN
ILIM 33
REFIN 34
AGND
MAX15035
18 IN
17 N.C.
REF 35
SKIP 36
EP2
16 LX
15 PGND
VCC 37
PGOOD 38
14 PGND
LX
13 PGND
N.C. 39
12 PGND
N.C. 40
11 PGND
+ 1 2 3 4 5 6 7 8 9 10
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
THIN QFN
(6mm x 6mm)
________________________________________________________________ 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.
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
www.DataSheet.co.kr
15A Step-Down Regulator with Internal Switches
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VIN = 12V, VDD = VCC = VEN = 5V, REFIN = ILIM = REF, SKIP = GND. TA = -40°C to +85°C, unless otherwise
specified.) (Note 1)
PARAMETER
REFERENCE
Reference Voltage
FAULT DETECTION
Output Overvoltage-Protection
Trip Threshold
Output Undervoltage-Protection
Trip Threshold
SYMBOL
CONDITIONS
VREF VDD = 4.5V to 5.5V
OVP
UVP
With respect to the internal target voltage
(error comparator threshold) rising edge;
hysteresis = 50mV
With respect to the internal target voltage
(error comparator threshold);
falling edge; hysteresis = 50mV
MIN
1.985
250
-240
MAX UNITS
2.015
V
350 mV
-160
mV
Output Undervoltage
Fault-Propagation Delay
tUVP FB forced 25mV below trip threshold
80
400 µs
PGOOD Output-Low Voltage
VCC Undervoltage Lockout
Threshold
ISINK = 3mA
VUVLO(VCC)
Rising edge, PWM disabled below this level,
hysteresis = 100mV
3.95
0.4 V
4.45 V
CURRENT LIMIT
ILIM Input Range
Current-Limit Threshold
Ultrasonic Frequency
INPUTS AND OUTPUTS
EN Logic-Input Threshold
SKIP Quad-Level Input
Logic Levels
VILIMIT
VILIM = 0.4V, VGND = VLX
ILIM = REF (2.0V), VGND - VLX
SKIP = open (3.3V), VFB = VREFIN + 50mV
0.4
17
90
17
VEN
V SKIP
EN rising edge hysteresis = 450mV (typ)
High (5V VDD)
Mid (3.3V)
Ref (2.0V)
Low (GND)
1.20
VCC -
0.4
3.0
1.7
VREF
23
110
V
mV
kHz
2.20 V
3.6 V
2.3
0.4
Note 1: Limits are 100% production tested at TA = +25°C. Maximum and minimum limits over temperature are guaranteed by
design and characterization.
Note 2: The 0 to 0.5V range is guaranteed by design, not production tested.
Note 3: On-time and off-time specifications are measured from 50% point to 50% point at the unloaded LX node. The typical 25ns
dead time that occurs between the high-side driver falling edge (high-side MOSFET turn-off) and the low-side MOSFET turn-
on) is included in the on-time measurement. Similarly, the typical 25ns dead time that occurs between the low-side driver
falling edge (low-side MOSFET turn-off) and the high-side driver rising edge (high-side MOSFET turn-on) is included in the
off-time measurement.
_______________________________________________________________________________________ 5
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
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15A Step-Down Regulator with Internal Switches
Pin Description (continued)
PIN NAME
FUNCTION
Feedback Voltage Sense Connection. Connect directly to the positive terminal of the output capacitors
32 FB for output voltages less than 2V as shown in Figure 1. For fixed-output voltages greater than 2V,
connect REFIN to REF and use a resistive divider to set the output voltage (Figure 6). FB senses the
output voltage to determine the on-time for the high-side switching MOSFET.
Current-Limit Threshold Adjustment. The current-limit threshold is 0.05 times (1/20) the voltage at
33
ILIM
ILIM. Connect ILIM to a resistive divider (from REF) to set the current-limit threshold between 20mV
and 100mV (with 0.4V to 2V at ILIM).
External Reference Input. REFIN sets the feedback regulation voltage (VFB = VREFIN) of the
34
REFIN
MAX15035 using a resistor-divider connected between REF and AGND. The MAX15035 includes an
internal window comparator to detect REFIN voltage transitions, allowing the controller to blank
PGOOD and the fault protection.
35
REF
2V Reference Voltage. Bypass to analog ground using a 1nF ceramic capacitor. The reference can
source up to 50µA for external loads.
Pulse-Skipping Control Input. This four-level input determines the mode of operation under normal
steady-state conditions and dynamic output-voltage transitions:
36
SKIP
VDD (5V) = Forced-PWM operation
REF (2V) = Pulse-skipping mode (with forced-PWM during transitions)
Open (3.3V) = Ultrasonic mode (without forced-PWM during transitions)
GND = Pulse-skipping mode (without forced-PWM during transitions)
37
VCC
5V Analog Supply Voltage. Internally connected to VDD through an internal 20Ω resistor. Bypass VCC
to analog ground using a 1µF ceramic capacitor.
Open-Drain Power-Good Output. PGOOD is low when the output voltage is more than 200mV (typ)
38 PGOOD below or 300mV (typ) above the target voltage (VREFIN), during soft-start, and soft-shutdown. After
the soft-start circuit has terminated, PGOOD becomes high impedance if the output is in regulation.
PGOOD is blanked—forced high-impedance state—when a dynamic REFIN transition is detected.
EP1
(41)
AGND
Exposed Pad 1/Analog Ground. Internally connected to the controller’s ground plane and substrate.
Connect directly to ground.
EP2
(42)
Exposed Pad 2/Inductor Connection. Internally connected to drain of the low-side MOSFET and
LX source of the high-side MOSFET (Figure 2). Connect LX to the switched side of the inductor as
shown in Figure 1.
EP3
(43)
IN
Exposed Pad 3/Power MOSFET Input Power Source. Internally connected to drain of the high-side
MOSFET (Figure 2).
______________________________________________________________________________________ 11
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11 Page | ||
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| PDF Descargar | [ Datasheet MAX15035.PDF ] | |
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