MAX17620 Datasheet, PDF (1/15 Pages) Maxim Integrated Products – Reduces Number of DC-DC Regulators to Stock

MAX17620
4MHz, Miniature 600mA, Synchronous Step-Down
DC-DC Converter with Integrated MOSFETs
General Description
The MAX17620 is a high-frequency, high-efficiency
synchronous step-down DC-DC converter with integrated
MOSFETs that operates over a 2.7V to 5.5V input voltage
range. The device supports up to 600mA load current and
1.5V to 100% V_IN output voltage. High-frequency operation
enables the use of small, low-cost inductors and capacitors.
The device features selectable PWM/skip mode of
operation at light loads and operates at a 4MHz fixed-
frequency in PWM mode. Skip mode improves system
efficiency at light loads, while PWM mode maintains a
constant switching frequency over the entire load.
In skip mode, the device draws only 40µA of quiescent
current from the supply input. In shutdown mode, the current
consumption is reduced to 0.1µA.
The device also features a soft-start feature to reduce
the inrush current during startup, and also incorporates an
enable (EN) pin to turn on/off the device. An open-drain
PGOOD pin provides power-good signal to the system
upon achieving successful regulation of the output voltage.
The MAX17620 is available in an 8-pin, 2mm x 2mm
TDFN package and operates over the -40°C to +125°C
temperature range.
Applications
●● Point-of-Load Power Supply
●● Standard 5V Rail Supplies
●● Battery-Powered Instruments
●● Distributed Power Systems
Benefits and Features
●● Minimizes External Components, Reducing Total
Cost
• Synchronous Operation for High Efficiency and
Reduced Cost
• Internal Compensation for Stable Operation at Any
Output Voltage
• All-Ceramic Capacitor Solution
• 4MHz Operation
• Only 5 External Components Required
• Total Solution Size is 12mm² (Sum of the
Components Area)
●● Reduces Number of DC-DC Regulators to Stock
• Wide 2.7V to 5.5V Input Voltage Range
• Adjustable 1.5V to 100% V_IN Output Voltage Range
• Delivers Up to 600mA Load Current
• 100% Duty-Cycle Operation
• +1%/-0.75% Reference Voltage Accuracy
• Available in a 2mm x 2mm TDFN Package
●● Reduces Power Dissipation
• Peak Efficiency 91%
• Skip Mode for High Light-Load Efficiency
• Shutdown Current = 0.1µA
●● Operates Reliably
• Peak Current-Limit Protection
• Soft-Start Reduces Inrush Current During Startup
• Built-In Output-Voltage Monitoring
(Open-Drain PGOOD Pin)
• -40°C to +125°C Operation
Ordering Information appears at end of data sheet.
Typical Application Circuit—1.8V, 600mA Step-Down Regulator
2.7V TO 5.5V
CIN
2.2µF
L
1µH
IN
LX
MAX17620
GND
V_OUT
EN
FB
MODE
PGOOD
COUT
10µF
R1
24kΩ
VOUT
1.8V/600mA
R2
19.1kΩ
CIN: 2.2µF/10V/0603/X7R,GRM188R71A225KE15D, MURATA
L1: 1μH, 60mΩ, MAKK2016H1ROM, TAIYO-YUDEN
COUT: 10μF/6.3V/0805/X7R, GRM21BR70J106KE76K, MURATA
19-7543; Rev 3; 7/16