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2.5V to 5.0V, 0.5A/2.5A, Charge/Discharge Regulator for Supercapacitor Backup Applications

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製品の詳細

The MAX38886 is a storage capacitor or capacitor bank backup regulator designed to efficiently transfer power between a storage element and a system supply rail in reversible buck and boost operations using the same inductor.

When the main supply is present and above the minimum system supply voltage, the regulator operates in buck mode and charges the storage element at up to 500mA peak inductor current. Once the storage element is charged, the circuit draws only 2.5μA of current while it maintains the supercapacitor or other storage element in its ready state. When the main supply is removed, the regulator operates in boost mode and prevents the system from dropping below the minimum operating voltage, discharging the storage element at up to 2.5A peak inductor current.

The MAX38886 is externally programmable for minimum and maximum voltage of the storage element, such as supercapacitor, minimum system voltage, and maximum charge and discharge currents. The internal DC-DC converter requires only a 1µH inductor.

主な機能

  • 2.5V to 5V System Output Voltage
  • Up to 4.5V Capacitor Voltage Range
  • Up to 2.5A Peak Inductor Discharge Current
  • Programmable Voltage and Current Thresholds
  • ±2% Threshold Accuracy
  • Up to 95% Efficiency, Charge or Discharge
  • 2.5μA Ready Quiescent Current
  • Small Solution Size
    • 3mm x 3mm x 0.75mm TDFN Package

アプリケーション/用途

  • ハンドヘルド産業用機器
  • ポータブルコンピュータ
  • リムーバブルバッテリを備えたポータブル機器
Parametric specs for Battery Chargers
Charging VIN (V) (max) 5.5
Max. ICHG (A) 2.5
Cell Chemistry Supercapacitor
Charger (V) 0.8 to 5
Oper. Temp. (°C) -40 to +125
Package/Pins TDFN-CU/14
Budgetary
Price (See Notes)
$1.79 @1k
Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 0.8
VIN (V) (max) 4.5
VOUT1 (V) (min) 2.5
VOUT1 (V) (max) 5
IOUT1 (A) (max) 2.5
Switch Type Internal
Output Adjust. Method Resistor
ICC (mA) (typ) 0.035
# DC-DC Outputs 1
Switching Frequency (kHz) 2000
Design Tools EE-Sim
Package/Pins TDFN-CU/14
Budgetary
Price (See Notes)
$1.79 @1k
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簡略化されたブロック図

MAX38886:標準アプリケーション回路 MAX38886:標準アプリケーション回路 Zoom icon

技術資料

設計と開発

以下タイトルをクリックして詳細をご覧ください。

説明

The MAX38886 evaluation kit (EV kit) evaluates the MAX38886 IC. The MAX38886 is a super cap backup regulator designed to transfer power between a super cap and a system supply rail. When the main battery is present and above the minimum system supply voltage, the regulator charges the super cap at up to a 500mA rate. Once the super cap is charged, the circuit draws only 3µA of current while it maintains the super cap in its ready state. When the main battery is removed, the regulator prevents the system from dropping below the minimum operating voltage, discharging the super cap at up to a 2.5A peak inductor current. Multiple MAX38886 ICs can be connected in parallel for higher current applications. The MAX38886 is externally programmable for mini- mum and maximum super cap voltage, minimum system voltage, and maximum charge and discharge currents. The internal DC-DC converter requires only a 1µH inductor and a 22µF capacitor.

詳細を見る

特長

  • 2.99V to 3.36V System Output Voltage Range
  • 0.5V to 2.71V Super Cap Voltage Range
  • 2.5A Peak Discharge Current
  • Resistor-Adjustable Voltage and Current Thresholds
  • Proven 2-Layer, 2oz Copper PCB Layout
  • Compact Solution Size
  • Fully Assembled and Tested

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ツールおよびモデル

EE-Sim: 設計およびシミュレーションMAX38886

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サポートとトレーニング

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パラメーター

Parametric specs for Battery Chargers
Charging VIN (V) (max) 5.5
Max. ICHG (A) 2.5
Cell Chemistry Supercapacitor
Charger (V) 0.8 to 5
Oper. Temp. (°C) -40 to +125
Package/Pins TDFN-CU/14
Budgetary
Price (See Notes)
$1.79 @1k
Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 0.8
VIN (V) (max) 4.5
VOUT1 (V) (min) 2.5
VOUT1 (V) (max) 5
IOUT1 (A) (max) 2.5
Switch Type Internal
Output Adjust. Method Resistor
ICC (mA) (typ) 0.035
# DC-DC Outputs 1
Switching Frequency (kHz) 2000
Design Tools EE-Sim
Package/Pins TDFN-CU/14
Budgetary
Price (See Notes)
$1.79 @1k

主な機能

  • 2.5V to 5V System Output Voltage
  • Up to 4.5V Capacitor Voltage Range
  • Up to 2.5A Peak Inductor Discharge Current
  • Programmable Voltage and Current Thresholds
  • ±2% Threshold Accuracy
  • Up to 95% Efficiency, Charge or Discharge
  • 2.5μA Ready Quiescent Current
  • Small Solution Size
    • 3mm x 3mm x 0.75mm TDFN Package

アプリケーション/用途

  • ハンドヘルド産業用機器
  • ポータブルコンピュータ
  • リムーバブルバッテリを備えたポータブル機器

説明

The MAX38886 is a storage capacitor or capacitor bank backup regulator designed to efficiently transfer power between a storage element and a system supply rail in reversible buck and boost operations using the same inductor.

When the main supply is present and above the minimum system supply voltage, the regulator operates in buck mode and charges the storage element at up to 500mA peak inductor current. Once the storage element is charged, the circuit draws only 2.5μA of current while it maintains the supercapacitor or other storage element in its ready state. When the main supply is removed, the regulator operates in boost mode and prevents the system from dropping below the minimum operating voltage, discharging the storage element at up to 2.5A peak inductor current.

The MAX38886 is externally programmable for minimum and maximum voltage of the storage element, such as supercapacitor, minimum system voltage, and maximum charge and discharge currents. The internal DC-DC converter requires only a 1µH inductor.

簡略化されたブロック図

MAX38886:標準アプリケーション回路 MAX38886:標準アプリケーション回路 Zoom icon

技術資料

サポートとトレーニング

ナレッジベースを検索して技術質問への回答を探す。

絞り込まれた検索

マキシムでは、お客様の技術的質問にお答えするため、アプリケーションエンジニアの専任チームも配置しています。 サポートセンター をご覧ください。