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PDF MAX20745 Data sheet ( Hoja de datos )
| Número de pieza | MAX20745 | |
| Descripción | Step-Down Switching Regulator | |
| Fabricantes | Maxim Integrated | |
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MAX20745
EVALUATION KIT AVAILABLE
Integrated, Step-Down Switching Regulator
General Description
The MAX20745 is a fully integrated, highly efficient
switching regulator for applications operating from 4.5V to
16V and requiring up to 25A maximum load. This single-
chip regulator provides extremely compact, high-efficien-
cy power-delivery solutions with high-precision output
voltages and excellent transient response for networking,
datacom, and telecom equipment.
The IC offers a broad range of programmable features
through capacitors and resistors connected to dedicated
programming pins. Using this feature, the operation can
be optimized for a specific application, reducing the
component count- and/or setting-appropriate trade-offs
between the regulator's performance and system cost.
Ease of programming enables using the same design for
multiple applications.
The MAX20745 includes protection capabilities. Positive
and negative cycle-by-cycle overcurrent protection and
overtemperature protection ensure a rugged design. Input
undervoltage lockout shuts down the device to prevent
operation when the input voltage is out of specification. A
status pin provides an output signal to show that the out-
put voltage is within range and the system is regulating.
Applications
●● Communications Equipment
●● Networking Equipment
●● Servers and Storage Equipment
●● Point-of-Load Voltage Regulators
●● μP Chipsets
●● Memory VDDQ
●● I/O
DESCRIPTION
CURRENT INPUT
RATING* VOLTAGE
OUTPUT
VOLTAGE
Electrical rating
25A
4.5V to 16V
0.6484V
to 5.5V
Thermal rating,
TA = 55°C, 200LFM
Thermal rating,
TA = 85°C, 0LFM
25A
15A
12V
12V
1V
1V
*For specific operating conditions, refer to the SOA curves in
the Typical Operating Characteristics section.
Benefits and Features
●● High Power Density and Low Component Count
• Overall Solution Size: 509mm2 Including Inductor
and Output Capacitors
• 90.8% Peak Efficiency: VDDH = 12V and
VOUT = 1V
• Fast Transient Response: Supports Up to 300A/μs
Load-Step Transients
●● Optimized Component Performance and Efficiency
with Reduced Design-In Time
●● Increased Power-Supply Reliability with System and
IC Self-Protection Features
• Differential Remote Sense with Open-Circuit
Detection
• Hiccup Overcurrent Protection
• Programmable Thermal Shutdown
Typical System Efficiency vs.
Load Current (VDDH = 12V)
100
95
90
85
80
75
70
65
60
55
50
0
VoVutO=U5TV= 5V
VoVutO=U3T.3=V 3.3V
VoVutO=U1T.8=V 1.8V
VoVutO=U1T.2=V 1.2V
VoVutO=U1TV= 1V
VoVutO=U0T.8=V 0.8V
VoVutO=U0T.6=5V0.65V
5 10 15 20 25
IOUT (A)
Ordering Information appears at end of data sheet.
19-8588; Rev 0; 10/16
1 page  
MAX20745
Integrated, Step-Down Switching Regulator
Electrical Characteristics (continued)
(Circuit of Figure 6, VDDH = 4.5V to 16V, unless otherwise specified. Typical values are at TA = +32°C. All devices 100% tested at room
temperature. Limits over temperature guaranteed by design.)
PARAMETER
STAT PIN
Allowable Pullup Voltage
Status Output Low
Status Output High Leakage
Current
SYMBOL
CONDITIONS
MIN
TYP
MAX UNITS
VOHSTAT
VOLSTAT
ISTAT = 2.5mA
ISTAT = 0.2mA, 0V < VCC < UVLO and
0V < VDDH < UVLO (Note 5)
ISTAT = 1.3mA, 0V < VCC < UVLO and
0V < VDDH < UVLO (Note 5)
STAT pulled up to 3.3V through 20kΩ
3.6
0.4
0.65
0.75
7
V
V
µA
Time from VOUT Ramp
Completion to STAT Pin Released
tSTAT
PGM1–PGM3 PINS (ALSO SEE TABLES 2–7)
Allowable R_SEL Resistor Range
STAT output low to high, set by R_SEL2
(Note 7)
12 resistor values detected
1.78
125
2000
162
µs
kΩ
R_SEL Resistor Required
Accuracy
EIA standard resistor values only
±1 %
Allowable C_SEL Capacitor
Range
Three options (0, 220, or 1000pF)
0
1000
pF
C_SEL Capacitor Required
Accuracy
Use X7R or better
±20 %
Allowable External Capacitance
SYSTEM SPECIFICATIONS (NOTE 10)
Load and stray capacitance in addition
to C_SELA/B
20 pF
Line Regulation
Load Regulation (Static)
Efficiency (VDDH = 12V,
VOUT = 1V)
VOUT
η
IOUT = 0 - IMAX
Peak
Full load
±0.2
±0.7
90.8
84.8
%
%
Note 5: Specification applies over the temperature range of TJ = -40° to +125°C.
Note 6: For proper regulation, it is required that VDDH > (VOUT + 2V). If VOUT is set greater than (UVLO - 2V), the IC can come out
of UVLO, but regulation is not guaranteed while VDDH is below (VOUT + 2V). To avoid this condition, OE can be held low
until VDDH is greater than (VOUT + 2V).
Note 7: Parameters that are programmable.
Note 8: Min/max limits are ≥ 4σ about the mean.
Note 9: Guaranteed by design; not production tested.
Note 10: These specifications refer to the operation of the system and are based on the circuit shown in the reference schematic.
Tolerance of external components can affect these parameters. System performance numbers are measured using the
Maxim evaluation board for this product with BOM as shown on the MAX20745 EV kit data sheet. If a different PCB layout
and different external components are used, these values can change.
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX20745
Integrated, Step-Down Switching Regulator
Pin Description
PIN
1
2
3, 4
5
6
7
8
9
10
11
12, 14
13
15
NAME
VSENSE+
VSENSE-
PGM2, PGM1
VDDH
GND
VX
BST
OE
VCC
AGND
VCC2, VCC3
STAT
PGM3
FUNCTION
Remote-Sense Positive Node. Connect this node to VOUT at the load. A resistive voltage-divider
can be used to regulate the output above the reference voltage.
Remote-Sense Negative Node. Connect this node to ground at the load using a Kelvin connection.
Program Node. Connect this node to ground through a programming resistor and capacitor.
Power Input Voltage. The high-side MOSFET switch is connected to this node. See the Input
Capacitor section for decoupling requirements.
Power Ground Node. The low-side MOSFET switch is connected to this node.
Power-Switching Node. Connect this node to the inductor.
Bootstrap for High-Side Switch. Connect a 0.22μF ceramic capacitor between BST and VX.
Output-Enable Node. This node is used to enable the regulator and has a precise threshold to allow
sequencing of multiple regulators. There is an internal 275kΩ (typ) pulldown on this pin.
Analog/Gate-Drive Supply for the IC from Internal 1.85V (typ) LDO. This node MUST be connected
to three 10µF X5R or better decoupling capacitors with a very short, wide trace. VCC can be
connected to 20kΩ pullups for STAT and OE as shown in Figure 6. Do not connect VCC to other
external loads. Do not overdrive VCC from an external source.
Analog/Signal Ground. See the PCB Layout section for layout information.
Connect to VCC. Digital factory test input. Must be connected high for normal operation.
Open-Drain Power-Good/Fault-Status Indication. Connect a pullup resistor to 1.8V or 3.3V.
Program Node. Connect this node to ground through a programming resistor and capacitor.
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
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| PDF Descargar | [ Datasheet MAX20745.PDF ] | |
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