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ML4854

Features: • 95% Efficiency at 200mA Load Current• Integrated Peak Current Limit• Variable Output Voltage Determined by External Resistors• Variable On-time Pulse Frequency Modulation (PFM)• Fully Internal Synchronous Rectifier (no external diodes) for High Efficiency ...

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SeekIC No. : 004422113 Detail

ML4854: Features: • 95% Efficiency at 200mA Load Current• Integrated Peak Current Limit• Variable Output Voltage Determined by External Resistors• Variable On-time Pulse Frequency Mo...

ML4854 Data Sheet

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Part Number:
ML4854
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/11/26

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Product Details

Description



Features:

• 95% Efficiency at 200mA Load Current
• Integrated Peak Current Limit
• Variable Output Voltage Determined by External Resistors
• Variable On-time Pulse Frequency Modulation (PFM)
• Fully Internal Synchronous Rectifier (no external diodes) for High Efficiency and Low Peak Currents
• Low-Battery Detection
• Logic Controlled Shutdown with True Load Disconnect


Application

• 2-3 alkaline/NiMH cells or 1 Li-Ion cell Operated Devices
• Cell Phones
• Medical Devices
• PDAs
• Portable Instrumentation


Pinout

Connection Diagram


Specifications

Absolute maximum ratings are those values, beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied.

Parameter
Min.
Max.
Units
VIN , VOUT Voltages (Relative to GND)
-0.3
7
V
Switch Voltage (VLto GND)
-0.3
VOUT +0.3
V
Voltage on any other Pin
-0.3
VOUT +0.3
V
Peak Switch Current (Ipeak)
- Internally Limited -
Output Current (IOUT)
500
mA
Continuous Power Dissipation
320
mW
Thermal Resistance (JA)
124
°C/W
Junction Temperature
150
°C
Storage Temperature Range
-65
+165
°C
Lead Temperature (soldering, 10s)
300
°C



Description

The ML4854 is a low power boost regulator designed for low voltage DC to DC conversion in two-cell battery powered systems such as cell phones and PDAs. The converter starts up at 1.3V and has an operating input voltage range from 1.6V to 4.5V. After the start it operates at an input voltage as low as 0.8V. Output voltage of ML4854 can be adjusted by external resistors from 3.3V to 5V with a maximum load current of 0.5A.

Quiescent current in shut down mode is less than 30A, which maximizes the battery live time. The ON time of ML4854 changes with the input voltage to maintain the ripple current constant and to provide the highest efficiency over a wide load range, while maintaining low peak currents in the boost inductor. The combination of integrated synchronous rectification, variable frequency operation, and low supply current make ML4854 ideal for portable applications.

The ML4854 is available in an 8 lead TSSOP package.




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