EVALUATION KIT AVAILABLE
MAX15462
42V, 300mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converters
General Description
Benefits and Features
● Eliminates External Components and Reduces
The MAX15462 high-efficiency, high-voltage, synchronous
step-down DC-DC converter with integrated MOSFETs
operates over a 4.5V to 42V input voltage range. The
converter delivers output current up to 300mA at 3.3V
(MAX15462A), 5V (MAX15462B), and adjustable output
voltages (MAX15462C). The device operates over the
-40°C to +125°C temperature range and is available in a
compact 8-pin (2mm x 2mm) TDFN package. Simulation
models are available.
Total Cost
• No Schottky—Synchronous Operation for High
Efficiency and Reduced Cost
• Internal Compensation
• Internal Feedback Divider for Fixed 3.3V, 5V
Output Voltages
• Internal Soft-Start
• All-Ceramic Capacitors, Ultra-Compact Layout
● Reduces Number of DC-DC Regulators to Stock
• Wide 4.5V to 42V Input Voltage Range
• Fixed 3.3V and 5V Output Voltage Options
The device employs a peak-current-mode control
architecture with a MODE pin that can be used to
operate the device in the pulse-width modulation (PWM)
or pulse-frequency modulation (PFM) control schemes.
PWM operation provides constant frequency operation at
all loads and is useful in applications sensitive to variable
switching frequency. PFM operation disables negative induc-
tor current and additionally skips pulses at light loads for high
efficiency. The low-resistance on-chip MOSFETs ensure high
efficiency at full load and simplify the PCB layout.
• Adjustable 0.9V to 0.89 x V Output Voltage Option
IN
• Delivers Up to 300mA Load Current
• Configurable Between PFM and Forced-PWM
Modes
● Reduces Power Dissipation
• Peak Efficiency = 92%
• PFM Feature for High Light-Load Efficiency
• Shutdown Current = 2.2µA (typ)
● Operates Reliably in Adverse Industrial Environments
• Hiccup-Mode Current Limit and Autoretry Startup
• Built-In Output Voltage Monitoring with Open-Drain
RESET Pin
To reduce input inrush current, the device offers an
internal soft-start. The device also incorporates an EN/
UVLO pin that allows the user to turn on the part at the
desired input-voltage level. An open-drain RESET pin can
be used for output-voltage monitoring.
• Programmable EN/UVLO Threshold
• Monotonic Startup into Prebiased Output
• Overtemperature Protection
Applications
● Process Control
● Industrial Sensors
● 4–20mA Current Loops
● HVAC and Building Control
● High-Voltage LDO Replacement
● General-Purpose Point of Load
• High Industrial -40°C to +125°C Ambient Operating
Temperature Range/-40°C to +150°C Junction
Temperature Range
Ordering Information appears at end of data sheet.
Typical Operating Circuit
L1
V
OUT
33µH
V
IN
3.3V,
300mA
4.5V TO
42V
V
LX
IN
C
1µF
IN
C
10µF
OUT
EN/UVLO
GND
MAX15462A
V
CC
RESET
C
VCC
1µF
V
MODE
OUT
19-7552; Rev 1; 2/17