MAX17501 Datasheet, PDF (1/16 Pages) Maxim Integrated Products – 60V, 500mA, Ultra-Small, High-Efficiency,Synchronous Step-Down DC-DC Converter

19-6244; Rev 0; 5/12
EVALUATION KIT AVAILABLE
MAX17501
60V, 500mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converter
General Description
The MAX17501 high-efficiency, high-voltage, synchro-
nous step-down DC-DC converter operates over a 4.5V to
60V input voltage range and is designed for a wide range
of applications. The ultra-wide-input operation makes it
ideal for not only industrial control and building automa-
tion, but also base stations, telecom, home entertainment
and automotive applications. It delivers output currents
up to 500mA, at output voltages of 3.3V and 5V. The out-
put voltage is accurate within Q1.6% over temperature.
The device operates over the -40NC to +125NC industrial
temperature range and is available in a tiny, 10-pin (3mm
x 2mm) TDFN with an exposed pad.
The device features peak-current-mode control with
pulse-width modulation (PWM). The PWM operation
ensures constant switching frequency at all operating
conditions. The low-resistance, on-chip, pMOS/nMOS
switches ensure high efficiency at full load while minimiz-
ing the critical inductances, making the layout a much
simpler task compared to discrete solutions.
The device offers fixed switching frequency of 600kHz. To
reduce input inrush current, the device offers an adjust-
able voltage soft-start feature with an external capacitor
from the SS pin to ground. 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. The device
supports hiccup-mode current-limit protection for low
power dissipation under overload and output short-circuit
conditions.
Applications
Industrial Process Control
HVAC and Building Control
General-Purpose Point-of-Load
Base Station, VOIP, Telecom
Home Theater
Automotive
Battery-Powered Equipment
Benefits and Features
S Eliminate External Components and Reduce Total
Cost
 No Schottky-Synchronous Operation for High
Efficiency and Reduced Cost
 Internal Compensation for Ultra-Compact
Layout
 All-Ceramic Capacitors
S Reduce Number of DC-DC Regulators to Stock
 Wide 4.5V to 60V Operating-Voltage Range
 Fixed 3.3V and 5V Output
 Delivers Up to 500mA Over Temperature
 600kHz Switching Frequency
S Reduce Power Dissipation
 Peak Efficiency > 90%
 Shutdown Current = 1µA (typ)
S Operate Reliably in Adverse Industrial Environments
 Hiccup-Mode Current Limit and Autoretry Startup
 Built-In Output-Voltage Monitoring (Open-Drain
RESET Pin)
 Resistor-Programmable UVLO Threshold
 Increased Safety with Adjustable Soft-Start and
Prebiased Power-Up
 Optional Adjustable Output and PFM (Available
Upon Factory Request)
 -40NC to +125NC Industrial Temperature Range
Typical Operating Circuit
VIN
24V ±20% C1
1µF
R1
1206
3.32MI
1
JU1 2
3
R2
866kI
C2
1µF
C3
3300pF
VIN
EN/UVLO
LX
PGND
L1
47µH
C4
10µF, 6.3V
1206
MAX17501F
GND
VCC
FB / VO
SS
N.C.
RESET
RESET
VOUT
5V, 500mA
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part, refer to www.maxim-ic.com/MAX17501.related.
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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.