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Buck/Boost Regulating Charge Pump in µMAX

Industry's Smallest 100mA Buck/Boost Solution

Product Details

Key Features

Parametric specs for Charge Pumps
Topology Regulated
VIN (V) (min) 1.6
VIN (V) (max) 5.5
IOUT (A) (typ) 0.1
Unadj. VOUT (V) 3.3
Adj. VOUT (V) (min) 2.5
Adj. VOUT (V) (max) 5.5
ICC (mA) (max) 0.18
Switching Frequency (kHz) 1500
Oper. Temp. (°C) -40 to +85
Package/Pins UMAX/10
Budgetary
Price (See Notes)
3.11
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Simplified Block Diagram

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Parameters

Parametric specs for Charge Pumps
Topology Regulated
VIN (V) (min) 1.6
VIN (V) (max) 5.5
IOUT (A) (typ) 0.1
Unadj. VOUT (V) 3.3
Adj. VOUT (V) (min) 2.5
Adj. VOUT (V) (max) 5.5
ICC (mA) (max) 0.18
Switching Frequency (kHz) 1500
Oper. Temp. (°C) -40 to +85
Package/Pins UMAX/10
Budgetary
Price (See Notes)
3.11

Key Features

  • Regulated Output Voltage (Fixed 3.3V or Adjustable 2.5V to 5.5V)
  • 100mA Guaranteed Output Current
  • +1.6V to +5.5V Input Voltage Range
  • Low 50µA Quiescent Supply Current
  • 1µA Shutdown Mode
  • Load Disconnected from Input in Shutdown
  • High 1.5MHz Operating Frequency
  • Uses Small Ceramic Capacitors
  • Short-Circuit Protection and Thermal Shutdown
  • Small 10-Pin µMAX Package

Applications/Uses

  • Backup Battery Boost Converters
  • Li+ Battery-Powered Applications
  • Miniature Equipment
  • Translators

Description

The MAX1759 is a buck/boost regulating charge pump that generates a regulated output voltage from a single lithium-ion (Li+) cell, or two or three NiMH or alkaline cells for small hand-held portable equipment. The MAX1759 operates over a wide +1.6V to +5.5V input voltage range and generates a fixed 3.3V or adjustable (2.5V to 5.5V) output (Dual Mode™). Maxim's unique charge-pump architecture allows the input voltage to be higher or lower than the regulated output voltage. Despite its high 1.5MHz operating frequency, the MAX1759 maintains low 50µA quiescent supply current.

Designed to be an extremely compact buck/boost converter, this device requires only three small ceramic capacitors to build a complete DC-DC converter capable of generating a guaranteed 100mA (min) output current from a +2.5V input. For added flexibility, the MAX1759 also includes an open-drain power-OK (POK) output that signals when the output voltage is in regulation.

The MAX1759 is available in a space-saving 10-pin µMAX package that is 1.09mm high and half the size of an 8-pin SO.

Simplified Block Diagram

MAX1759: Typical Operating Circuit MAX1759: Typical Operating Circuit Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .