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2.7V to 5.5V, 700mA, Synchronous Step-Down Converter with Integrated MOSFETs

High-Efficiency Synchronous Buck Regulator Offers Balance of High Performance, Wide Temperature Range, and Small Size

产品详情

主要特征

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.7
VIN (V) (max) 5.5
VOUT1 (V) (min) 0.8
VOUT1 (V) (max) 3.3
IOUT1 (A) (max) 0.7
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
Power Good Signal Yes
IQ (mA) (typ) 0.04
# DC-DC Outputs 1
Switching Frequency (kHz) 4000
Design Tools EE-Sim
Package/Pins TDFN-CU/8
Budgetary
Price (See Notes)
0.46
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Technical Docs

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参量

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.7
VIN (V) (max) 5.5
VOUT1 (V) (min) 0.8
VOUT1 (V) (max) 3.3
IOUT1 (A) (max) 0.7
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
Power Good Signal Yes
IQ (mA) (typ) 0.04
# DC-DC Outputs 1
Switching Frequency (kHz) 4000
Design Tools generateDesignEESIMUrl('https://maxim.transim.com/pwm2/designreq/Index?partId=29606', '')
Package/Pins TDFN-CU/8
Budgetary
Price (See Notes)
0.46

主要特征

  • Easy to Use
    • 2.7V to 5.5V Input
    • Adjustable 0.8V to 3.3V Output
    • ±1% Feedback Accuracy
    • Up to 700mA Output Current
    • Fixed 2MHz or 4MHz Operation
    • 100% Duty-Cycle Operation
    • Internally Compensated
    • All Ceramic Capacitors
  • High Efficiency
    • Selectable PWM- or PFM-Mode of Operation
    • Shutdown Current as Low as 0.1μA (typ)
  • Flexible Design
    • Internal Soft-Start and Prebias Startup
    • Open-Drain Power Good Output (PGOOD Pin)
  • Robust Operation
    • Overtemperature Protection
    • Overcurrent Protection
    • -40°C to +125°C Ambient Operating
    • Temperature/-40°C to +150°C Junction Temperature

应用/用途

  • Factory Automation
  • Personal Electronics
  • Point-of-Load Power Supply

描述

MAX17625 and MAX17626 are high-frequency synchronous step-down DC-DC converters with integrated MOSFETs and compensation components that operate over a 2.7V to 5.5V input-voltage range. MAX17625 and MAX17626 support up to 700mA load current and allow the use of small, low-cost input and output capacitors. The output voltage can be adjusted from 0.8V to 3.3V.

When the EN pin is asserted, an internal power-up sequence ramps up the error-amplifier reference, resulting in output-voltage soft-start. The FB pin monitors the output voltage through a resistor-divider. The devices select either PFM or forced-PWM mode depending on the state of the MODE pin at power-up. By pulling the EN pin to low, the devices enter shutdown mode and consume only 0.1µA (typ) of standby current.

The devices use an internally compensated, fixed-frequency, peak-current mode control scheme. On the falling edge of an internal clock, the high-side pMOSFET turns on and continues to be on during normal operation until at least the rising edge of the clock (for 40ns). An internal error amplifier compares the feedback voltage to a fixed internal reference voltage and generates an error voltage. The error voltage is compared to the sum of the current-sense voltage and the slope-compensation voltage by the PWM comparator to set the on-time. During the on-time of the pMOSFET, the inductor current ramps up. For the remainder of the switching period (off-time), the pMOSFET is kept off and the low-side nMOSFET turns on. During the off-time, the inductor releases the stored energy as the inductor current ramps down, providing current to the output. Under overload conditions, the cycle-by-cycle current-limit feature limits the inductor peak current by turning off the high-side pMOSFET and turning on the low-side nMOSFET.

简化框图

MAX17625, MAX17626: Simplified Application Diagram MAX17625, MAX17626: Simplified Application Diagram Zoom icon

Technical Docs

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在Maxim的知识库中搜索技术问题的答案

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Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心