MAX17502 Datasheet, PDF (1/17 Pages) Maxim Integrated Products – 60V, 1A, Ultra-Small, High-Efficiency,Synchronous Step-Down DC-DC Converter

19-6245; Rev 0; 5/12
MAX17502
60V, 1A, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converter
General Description
The MAX17502 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 build-
ing automation, but also base stations, telecom, home
entertainment, and automotive applications. It delivers
output currents up to 1A, at output voltages of 3.3V and
5V. The output 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 lead(Pb)-free package
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 operat-
ing conditions. The low-resistance, on-chip, pMOS/
nMOS switches ensure high efficiency at full load while
minimizing 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
adjustable 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 sys-
tem 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
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/MAX17502.related
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 1A 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
2.2µF
1210
1
JU1 2
3
R1
3.32MI
R2
866kI
C2
1µF
C3
3300pF
VIN
EN/UVLO
LX
PGND
L1
22µH
C4
10µF, 10V
1210
MAX17502F
GND
VCC
FB/ VO
SS
N.C.
RESET
RESET
VOUT
5V, 1A
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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.