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Part Number: LM2618
Description: The LM2618 step-down DC-DC converter is optimized for powering low voltage circuits from a single Lithium-Ion cell. It ...
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LM2618
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General Description
LM2618 General Description
The LM2618 step-down DC-DC converter is optimized for powering low voltage circuits from a single Lithium-Ion cell. It provides up to 400mA (300mA for B grade), over an input voltage range of 2.8V to 5.5V. Pin programmable output voltages of 1.80V, 1.83V, 1.87V or 1.92V allow adjustment for MPU voltage options without board redesign or external feedback resistors. Internal synchronous rectification provides high efficiency in both PWM and PFM operation.
The device has three pin-selectable modes for maximizing battery life in mobile phones and similar portable applications. Low-noise PWM mode offers 600kHz fixed-frequency operation to reduce interference in RF and data acquisition applications during full-power operation. A SYNC input allows synchronizing the switching frequency in a range of 500kHz to 1MHz to avoid noise from intermodulation with system frequencies. Low-current hysteretic PFM mode reduces quiescent current to 180 A (typ.) during system standby. Shutdown mode turns the device off and reduces battery consumption to 0.02A (typ.). Additional features include soft start and current overload protection.
The LM2618 is available in a 10 pin micro SMD packge. This package uses National's wafer level chip-scale micro SMD technology and offers the smallest possible size. Only three small external surface-mount components, an inductor and two ceramic capacitors are required.
LM2618 Maximum Ratings
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications.
PVIN, VDD, to SGND −0.2V to +6V
PGND to SGND −0.2V to +0.2V
EN, SYNC/MODE, VID0, VID1 to
SGND −0.2V to +6V
FB, SW (GND −0.2V) to
(VDD +0.2V)
Storage Temperature Range −45°C to +150°C
Lead temperature
(Soldering, 10 sec.) 260°C
Junction Temperature (Note 2) −25°C to 125°C
Minimum ESD Rating
Human body model, C = 100pF, R =
1.5 k ±2.0kV
Thermal Resistance (JA)
LM2618ATL & LM2618BTL (Note 3) 140°C/W
PVIN, VDD, to SGND −0.2V to +6V
PGND to SGND −0.2V to +0.2V
EN, SYNC/MODE, VID0, VID1 to
SGND −0.2V to +6V
FB, SW (GND −0.2V) to
(VDD +0.2V)
Storage Temperature Range −45°C to +150°C
Lead temperature
(Soldering, 10 sec.) 260°C
Junction Temperature (Note 2) −25°C to 125°C
Minimum ESD Rating
Human body model, C = 100pF, R =
1.5 k ±2.0kV
Thermal Resistance (JA)
LM2618ATL & LM2618BTL (Note 3) 140°C/W
LM2618 Features
Sub-miniature 10-pin micro SMD package
Only three tiny surface-mount external components required
Uses small ceramic capacitors.
Internal soft start
Current overload protection
Thermal Shutdown Protection
No external compensation required
Only three tiny surface-mount external components required
Uses small ceramic capacitors.
Internal soft start
Current overload protection
Thermal Shutdown Protection
No external compensation required
LM2618 Typical Application
Mobile Phones
Hand-Held Radios
Battery Powered Devices
Hand-Held Radios
Battery Powered Devices
LM2618 Connection Diagram
LM2618
PDF/DataSheet Download
- Datasheet: LM2618
- File Size: 427300 KB
- Manufacturer: NSC [National Semiconductor]
- Click here to Download
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