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MAX17633
4.5V to 36V, 3.5A, High Efficiency,
Synchronous Step-Down, DC-DC Converter
General Description
Benefits and Features
● Reduces External Components and Total Cost
• No Schottky - Synchronous Operation
• Internal Compensation Components
The Himalaya series of voltage regulator ICs, power mod-
ules, and chargers enable cooler, smaller, and simpler
power supply solutions. The MAX17633 is a high-effi-
ciency, high-voltage, Himalaya synchronous step-down
DC-DC converter with integrated MOSFETs operating
over an input voltage range of 4.5V to 36V. It can deliver
up to 3.5A current. The MAX17633 is available in three
variants MAX17633A, MAX17633B, and MAX17633C.
The MAX17633A and MAX17633B are the fixed 3.3V and
fixed 5V output voltage parts, respectively. MAX17633C
is an adjustable output voltage (from 0.9V up to 90% of
• All-Ceramic Capacitors, Compact Layout
● Reduces Number of DC-DC Regulators to Stock
• Wide 4.5V to 36V Input
• Adjustable Output Range from 0.9V up to 90% of V
• Delivers up to 3.5A Over the Temperature Range
• 400kHz to 2.2MHz Adjustable Frequency with
External Clock Synchronization
IN
• Available in a 20-Pin, 4mm × 4mm TQFN Package
V ) part. Built-in compensation across the output voltage
IN
● Reduces Power Dissipation
• Peak Efficiency > 93%
range eliminates the need for external components.
The MAX17633 features peak-current-mode control archi-
tecture. The device can be operated in forced pulse-width
modulation (PWM), pulse-frequency modulation (PFM),
or discontinuous-conduction mode (DCM) to enable high
efficiency under full-load and light-load conditions.
• PFM and DCM Modes Enable Enhanced Light-
Load Efficiency
• Auxiliary Bootstrap Supply (EXTVCC) for Improved
Efficiency
• 2.8μA Shutdown Current
The feedback-voltage-regulation accuracy over -40°C
to +125°C for the MAX17633A, MAX17633B, and
MAX17633C is ±1.3%. Simulation models are available.
● Operates Reliably in Adverse Industrial Environments
• Hiccup-Mode Overload Protection
• Adjustable and Monotonic Startup with Prebiased
Output Voltage
Applications
• Built-in Output-Voltage Monitoring with RESET
• Programmable EN/UVLO Threshold
• Overtemperature Protection
● Industrial Control Power Supplies
● General-Purpose Point-of-Load
● Distributed Supply Regulation
● Base-Station Power Supplies
● Wall Transformer Regulation
● High-Voltage Single-Board systems
• CISPR 22 Class B Compliant
• Wide -40°C to +125°C Ambient Operating Temper-
ature Range / -40°C to +150°C Junction Tempera-
ture Range
Ordering Information appears at end of data sheet.
Typical Application Circuit
V
IN
6.5V TO 36V
C1
2 x 2.2µF
RT
IN
EN/UVLO
BST
LX
MODE/SYNC
C5
0.1µF
L1
V
OUT
INTVCC
6.8µH
C3
2.2µF
C4
2 x 22µF
5V,3.5A
MAX17633B
SGND
EXTVCC
SS
FB
C2
EP
5600pF
PGND
RESET
19-100305; Rev 2; 7/20