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LM2608ATL-1.3-LM2608ATL-1.8-LM2608ATLX-1.3
400mA Sub-miniature, High Efficiency, Programmable DC-DC Converter with Linear Mode
LM2608
400mA Sub-miniature, High Efficiency, Programmable
DC-DC Converter with Linear Mode
General DescriptionThe LM2608 step-down DC-DC converteris optimizedfor
powering ultra-low voltage circuits froma single Lithium-Ion
cell.It providesupto 400mA overan input voltage rangeof
2.8Vto 5.5V. Operating froma 1.35V reference, this device
provides pin-selectable output voltages of 1.3V/1.5V
(300mA)for low voltage versionor 1.5V/1.8V (400mA)for
high voltage version. This allows adjustmentfor DSPor CPU
voltage options,as wellas dynamic output voltage switching
for reduced power consumption. Internal synchronous recti-
fication provides high efficiency.
The LM2608 offers superior features and performancefor
mobile phones and similar portable applications with com-
plex power management systems. Pin-selectable PWM low-
noise and linear micropower modes offer improved system
controlfor maximizing battery life. Duringfull power opera-
tion, fixed-frequency PWM mode reduces interferenceinRF
and data acquisition applicationsby minimizing noise har-
monicsat sensitiveIF and sampling frequencies.A SYNC
input allows synchronizing the switching frequencyina
rangeof 500kHzto 1MHzto avoid noise from intermodula-
tion with system frequencies. Linear operation reduces qui-
escent currentto 20µA (typ) during system standbyfor ex-
tended battery life.It providesupto3 mAinthe linear mode.
Shutdown reduces battery consumptionto 0.02µA (typ.).
The LM2608is availableina10pin Micro SMD package.
This package uses National’s wafer level chip-scale Micro
SMD technology and offersthe smallest possible size.A high
switching frequency (600KHz) allows useof tiny surface-
mount components. Only four small external surface-mount
components,an inductor and three ceramic capacitors are
required. Pin selectable output voltage eliminates the need
for bulky external feedback resistors.
Key Specifications Operates froma single LiION cell (2.8Vto 5.5V) Pin selectable output voltage (1.5V/1.8Vor 1.3V/1.5V
versions), without external feedback resistors 400mA maximum load capability ±1% PWM mode DC output voltage precision
(Excluding external reference tolerance) 5mVtyp PWM mode output voltage ripple20µAtyp quiescent current (Linear Mode) 0.02µAtyp shutdown mode current Internal synchronous rectificationfor high efficiency
(91%at 2.8VIN, 1.8VOUT) 600kHz PWM mode switching frequency SYNC inputfor PWM mode frequency synchronization
from 500kHzto 1MHz 15% accuracyfor FOSC andIlim
Features Sub-miniature 10-pin thin Micro SMD package Only four tiny surface-mount external components
required Uses small ceramic capacitors Internal soft start Current and Thermal shutdown protection No external compensation required
Applications Mobile Phones Hand-Held Radios Battery Powered Devices
Typical Application CircuitDecember 2002
LM2608
400mA
Sub-miniature,
High
Efficiency
Programmable
DC-DC
Converter
with
Linear
Mode
