LM3677_15 Datasheet, PDF (1/28 Pages) Texas Instruments – 3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits

LM3677
www.ti.com
SNVS502F – MARCH 2007 – REVISED MAY 2013
3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits
Check for Samples: LM3677
FEATURES
1
•2 16 µA typical quiescent current
• 600 mA maximum load capability
• 3 MHz PWM fixed switching frequency (typ.)
• Automatic PFM/PWM mode switching
• Available in 5-bump DSBGA package and 6-pin
USON package
• Internal synchronous rectification for high
efficiency
• Internal soft start
• 0.01 µA typical shutdown current
• Operates from a single Li-Ion cell battery
• Only three tiny surface-mount external
components required (solution size less than
20 mm²)
• Current overload and thermal shutdown
protection
APPLICATIONS
• Mobile Phones
• PDAs
• MP3 Players
• W-LAN
• Portable Instruments
• Digital Still Cameras
• Portable Hard Disk Drives
DESCRIPTION
The LM3677 step-down DC-DC converter is
optimized for powering ultra-low voltage circuits from
a single Li-Ion cell battery and input voltage rails from
2.7V to 5.5V. It provides up to 600 mA load current
over the entire input voltage range. The LM3677 is
configured to different fixed voltage output options as
well as an adjustable output voltage version range
from 1.2V to 3.3V.
TYPICAL APPLICATION CIRCUITS
V_IN
2.7V to 5.5V
C_IN
4.7 PF
V_IN
1
5
LM3677
GND
2
L1: 1.0 PH
SW
EN
3
FB
4
V_OUT
C_OUT
10 PF
Figure 1. Typical Application Circuit
V_IN
2.7V to 5.5V
C_IN
4.7 PF
V_IN
GND
1
5
LM3677-
ADJ
2
L1: 1.0 PH
SW
C1
EN ₃
C2
4 ^FB
V_OUT
R1
C_OUT
10 PF
R2
Figure 2. Typical Application Circuit - ADJ.
Version
Figure 3. Efficiency vs. Output Current
(V_OUT = 1.8V)
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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