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PDF MAX17501 Data sheet ( Hoja de datos )
| Número de pieza | MAX17501 | |
| Descripción | Synchronous Step-Down DC-DC Converter | |
| Fabricantes | Maxim Integrated | |
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Hay una vista previa y un enlace de descarga de MAX17501 (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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MAX17501
EVALUATION KIT AVAILABLE
60V, 500mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converter
General Description
The MAX17501 high-efficiency, high-voltage, synchronous
step-down DC-DC converter with integrated MOSFETs
operates over a 4.5V to 60V input voltage range. This
device is offered in a fixed 3.3V, 5V, or adjustable output
voltage (0.9V to 92%VIN) while delivering up to 500mA
of current. The output voltage is accurate to within
±1.7% over -40°C to +125°C. The MAX17501 is available
in a compact TDFN package. Simulation models are
available.
The device features peak-current-mode control with
pulse-width modulation (PWM). Users can choose devices
with either pulse frequency modulation (PFM) or forced
PWM scheme. PFM devices skip pulses at light load
for higher efficiency, while forced-PWM devices operate
with fixed switching frequency at any load for noise sensitive-
applications. The low-resistance, on-chip MOSFETs
ensure high efficiency at full load and simplify the layout.
A programmable soft-start feature allows users to reduce
input inrush current. The device also incorporates an
output enable/undervoltage lockout pin (EN/UVLO) that
allows the user to turn on the part at the desired input-
voltage level. An open-drain RESET pin provides a
delayed power-good signal to the system upon achieving
successful regulation of the output voltage.
Applications
●● Industrial Process Control
●● HVAC and Building Control
●● Base Station, VOIP, Telecom
●● Home Theatre
●● Battery-Powered Equipment
●● General-Purpose Point-of-Load
Benefits and Features
●● Eliminates External Components and Reduce Total Cost
• No Schottky-Synchronous Operation for High
Efficiency and Reduced Cost
• Internal Compensation and Feedback Divider for
3.3V and 5V Fixed Outputs
• All-Ceramic Capacitors, Ultra-Compact Layout
●● Reduces Number of DC-DC Regulators to Stock
• Wide 4.5V to 60V Input Voltage Range
• 0.9V to 92%VIN Adjustable Output Voltage
• Delivers Up to 500mA
• 600kHz and 300kHz Switching Frequency Options
• Available in a 10-Pin, 3mm x 2mm TDFN Package
●● Reduces Power Dissipation
• Peak Efficiency > 90%
• PFM Feature for High Light-Load Efficiency
• Shutdown Current = 0.9μA (typ)
●● Operates Reliably in Adverse Industrial Environments
• Hiccup-Mode Current Limit, Sink Current Limit, and
Autoretry Startup
• Built-In Output-Voltage Monitoring (Open-Drain
RESET Pin)
• Resistor-Programmable EN/UVLO Threshold
• Adjustable Soft-Start and Prebiased Power-Up
• High Industrial -40°C to +125°C Ambient Operating
Temperature Range/-40°C to +150°C Junction
Temperature Range
Ordering Information/Selector Guide appears at end of data sheet.
19-6244; Rev 7; 7/16
1 page  
MAX17501
60V, 500mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converter
Typical Operating Characteristics
(VIN = 24V, VGND = VPGND = 0V, CVIN = CVCC = 1μF, VEN = 1.5V, CSS = 3300pF, VFB = 0.98 x VOUT, LX = unconnected, RESET =
unconnected, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced to GND,
unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
(MAX17501A), 3.3V OUTPUT, FIGURE 6 CIRCUIT
100
90
80
70
60
50
40
30
1
VIN = 36V
VIN = 24V
VIN = 12V
10 100
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
(MAX17501F), 5V OUTPUT, FIGURE 7 CIRCUIT
100
VIN = 12V
90
80
70
VIN = 36V
VIN = 48V
VIN = 24V
60
50
40
50 100 150 200 250 300 350 400 450 500
LOAD CURRENT (mA)
OUTPUT VOLTAGE vs. LOAD CURRENT
(MAX17501E), 3.3V OUTPUT, FIGURE 6 CIRCUIT
3.320
3.315
3.310
3.305
3.300
3.295
VIN = 12V VIN = 24V VIN = 36V
3.290
0 50 100 150 200 250 300 350 400 450 500
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
(MAX17501B), 5V OUTPUT, FIGURE 7 CIRCUIT
100
90 VIN = 12V VIN = 24V
80
70
60
50
VIN = 36V VIN = 48V
40
30
1
10 100
LOAD CURRENT (mA)
OUTPUT VOLTAGE vs. LOAD CURRENT
(MAX17501A), 3.3V OUTPUT, FIGURE 6 CIRCUIT
3.45
3.40
VIN = 36V
3.35
VIN = 24V
VIN = 12V
3.30
3.25
0 50 100 150 200 250 300 350 400 450 500
LOAD CURRENT (mA)
OUTPUT VOLTAGE vs. LOAD CURRENT
(MAX17501F), 5V OUTPUT, FIGURE 7 CIRCUIT
5.05
5.04
5.03
5.02
5.01
5.00
4.99
4.98 VIN = 48V VIN = 36V VIN = 24V VIN = 12V
4.97
4.96
4.95
0 50 100 150 200 250 300 350 400 450 500
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
(MAX17501E), 3.3V OUTPUT, FIGURE 6 CIRCUIT
95
90
85
80
75
70
VIN = 24V
VIN = 36V
65 VIN = 12V
60
55
50
45
50 100 150 200 250 300 350 400 450 500
LOAD CURRENT (mA)
OUTPUT VOLTAGE vs. LOAD CURRENT
(MAX17501B), 5V OUTPUT, FIGURE 7 CIRCUIT
5.20
5.15 VIN = 12V
5.10 VIN = 24V
VIN = 36V
5.05 VIN = 48V
5.00
4.95
4.90
0 50 100 150 200 250 300 350 400 450 500
LOAD CURRENT (mA)
SHUTDOWN CURRENT
vs. TEMPERATURE
1.10
1.05
1.00
0.95
0.90
0.85
0.80
0.75
0.70
-40 -20
0 20 40 60 80 100 120
TEMPERATURE (°C)
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX17501
60V, 500mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converter
Pin Configuration
TOP VIEW
MAX17501
PGND 1
VIN 2
+
10 LX
9 GND
EN/UVLO 3
8 RESET
VCC 4
FB/VO 5
EP*
7 N.C./COMP
6 SS
TDFN
(3mm x 2mm)
*EP = EXPOSED PAD. CONNECT TO GND
Pin Description
PIN NAME
FUNCTION
1
PGND
Power Ground. Connect PGND externally to the power ground plane. Connect GND and PGND pins
together at the ground return path of the VCC bypass capacitor.
2 VIN Power-Supply Input. The input supply range is from 4.5V to 60V.
Enable/Undervoltage Lockout Input. Drive EN/UVLO high to enable the output voltage. Connect to the
3 EN/UVLO center of the resistive divider between VIN and GND to set the input voltage (undervoltage threshold) at
which the device turns on. Pull up to VIN for always on.
4
VCC
5V LDO Output. Bypass VCC with 1µF ceramic capacitance to GND.
5
FB/VO
Feedback Input. For fixed output voltage devices, directly connect FB/VO to the output. For adjustable
output voltage devices, connect FB/VO to the center of the resistive divider between VOUT and GND.
6 SS Soft-Start Input. Connect a capacitor from SS to GND to set the soft-start time.
External Loop Compensation. For adjustable output voltage (MAX17501G/H) connect to an RC network
7
N.C./COMP
from COMP to GND. See the External Loop Compensation for Adjustable Output Versions section for
more details. For a fixed-output voltage (MAX17501A/B/E/F), this pin is a no connect (N.C.) and should
be left unconnected.
Open-Drain RESET Output. The RESET output is driven low if FB drops below 92.5% of its set value.
8 RESET RESET goes high 1024 clock cycles after FB rises above 95.5% of its set value. RESET is valid when
the device is enabled and VIN is above 4.5V.
9
GND
Analog Ground
10
LX
Switching Node. Connect LX to the switching side of the inductor. LX is high impedance when the device
is in shutdown mode.
—
EP
Exposed Pad. Connect to the GND pin of the IC. Connect to a large copper plane below the IC to improve
heat dissipation capability.
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet MAX17501.PDF ] | |
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