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




Application

Mobile Phones
Hand-Held Radios
Battery Powered Devices




Pinout






Specifications

Output Current	400, 300 mA
Input Min Voltage	2.8 Volt
Input Max Voltage	5.5 Volt
Output Min	1.8 Volt
Output Max	1.92 Volt
Frequency Min	500 kHz
Frequency Max	1000 kHz
Efficiency (peak)	91 %
On/Off Pin	Yes
Error Flag	No
SoftStart	Yes
Sync Pin	Yes
Inverting	No
Flyback	No
RegType	Switching Regulator
Temperature Min	-25 deg C
Temperature Max	85 deg C
Adjustable Output	Yes
Adj Switch Frequency	Yes
PWM Mode	Current
Topology	Synchronous Buck
Special Features	Pin-selectable PWM/PFM modes, Synchronous rectification in PFM mode, Max Iq in shutdown is 3uA, 2% output accuracy
Step-Down	Yes
Multiple Output Capability	No
Output Power	Undefined Watt
Output Voltage	Undefined Volt
Output Range	1.8V, 1.83V, 1.87V, 1.92V
Switching Frequency	1000 kHz
Feedback Voltage	Undefined Volt
Regulator Family	Undefined
Synchronous Rectification	Yes
View Using Catalog

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




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 LM2618 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.