lm2618 National Semiconductor Corporation, lm2618 Datasheet
lm2618
Available stocks
Related parts for lm2618
lm2618 Summary of contents
Page 1
... Shutdown mode turns the device off and reduces battery consumption to 0.02µA (typ.). Additional features include soft start and current overload protection. The LM2618 is available 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 ...
Page 2
... SMD LM2618ATL LM2618BTL 10-bump Wafer Level Chip Scale (micro SMD) LM2618ATLX LM2618BTLX (*) XY - denotes the date code marking (2 digit) in production (*) TT - refers to die run/lot traceability for production (*) I - pin one indication (*) S - Product line designator Note that Package Marking may change over the course of production www ...
Page 3
... SW Switching Node connection to the internal PFET switch and NFET synchronous rectifier. Connect to an inductor with a saturation current rating that exceeds the max Switch Peak Current Limit specification of the LM2618 (Figure 1) B3 PVIN Power Supply Input to the internal PFET switch. Connect to the input filter capacitor (Figure 1) ...
Page 4
... Minimum ESD Rating −0.2V to +6V Human body model 100pF 1.5 kΩ −0.2V to +0.2V Thermal Resistance (θ LM2618ATL & LM2618BTL (Note 3) −0.2V to +6V (GND −0.2V) to (VDD +0.2V) −45˚C to +150˚ 25˚C, and those in bold face type apply over the full Operating Tem- ...
Page 5
... Note 4: The LM2618 is designed for cell phone applications where turn-on after power-up is controlled by the system processor and internal UVLO (Under Voltage LockOut) circuitry is unecessary. The LM2618 has no UVLO circuitry and should be kept in shutdown by holding the EN pin low until the input voltage exceeds 2.8V. ...
Page 6
... Typical Operating Characteristics µH, unless otherwise noted. Quiescent Supply Current vs Temperature (V =1.8V) OUT Shutdown Quiescent Current vs Temperature Output Voltage vs Temperature (V = 1.8V, PFM Mode) OUT www.national.com LM2618ATL, Circuit of Figure 1, V Quiescent Supply Current vs Supply Voltage 20036406 Output Voltage vs Temperature ( V 20036421 Output Voltage vs Supply Voltage (V OUT 20036407 6 = 3.6V 25˚ ...
Page 7
... Output Voltage vs Supply Voltage (V = 1.8V, PFM Mode) OUT Output Voltage vs Output Current (V = 1.8V, PFM Mode) OUT Efficiency vs Output Current (V = 1.8V, PFM Mode) OUT LM2618ATL, Circuit of Figure 1, V Output Voltage vs Output Current (V OUT 20036419 Efficiency vs Output Current (V OUT 20036420 Switching Frequency vs Temperature 20036424 7 = 3.6V 25˚ ...
Page 8
... Typical Operating Characteristics unless otherwise noted. (Continued) PWM to PFM Response Load Transient Response (PWM Mode) Line Transient Response (PWM Mode) www.national.com LM2618ATL, Circuit of Figure 1, V Shutdown Response (PWM Mode) 20036413 Load Transient Response (PFM Mode) 20036412 20036416 8 = 3.6V 25˚ µH, ...
Page 9
... Shutdown mode turns the device off and reduces battery consumption to 0.02µA (typ.). The LM2618 offers good performance and a full set of fea- tures based on a current-mode switching buck architecture. The SYNC/MODE input accepts an external clock between 500kHz and 1MHz ...
Page 10
... Circuit Operation (Continued) PWM Operation The LM2618 can be set to current-mode PWM operation by connecting the SYNC/MODE pin to VDD. While in PWM (Pulse Width Modulation) mode, the output voltage is regu- lated by switching at a constant frequency and then modu- lating the energy per cycle to control power to the load. ...
Page 11
... LM2618 are turned off. Setting EN high to VDD enables normal operation. While turning on, soft start is activated. EN must be set low to turn off the LM2618 during undervolt- age conditions when the supply is less than the 2.8V mini- mum operating voltage. The LM2618 is designed for mobile ...
Page 12
... Current Limiting A current limit feature allows the LM2618 to protect itself and external components during overload conditions. Current limiting is implemented using an independent internal com- parator. In PWM mode, cycle-by-cycle current limiting is normally used excessive load pulls the output voltage down to approximately 0.7V, then the device switches to a timed current limit mode ...
Page 13
... The input filter capacitor supplies current to the PFET switch of the LM2618 in the first part of each cycle and reduces voltage ripple imposed on the input power source. The out- put filter capacitor smoothes out current flow from the induc- tor to the load, helps maintain a steady output voltage during transient load changes and reduces output voltage ripple ...
Page 14
... Connect the ground pins of the LM2618 and filter ca- pacitors together using generous component-side cop- per fill as a pseudo-ground plane. Then, connect this to the ground-plane (if one is used) with several vias ...
Page 15
... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...