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LM3677 Datasheet Preview

LM3677 Datasheet

600mA Miniature Step-Down DC-DC Converter

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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
VIN
2.7V to 5.5V
CIN
4.7 PF
VIN
1
5
LM3677
GND
2
L1: 1.0 PH
SW
EN
3
FB
4
VOUT
COUT
10 PF
Figure 1. Typical Application Circuit
VIN
2.7V to 5.5V
CIN
4.7 PF
VIN
GND
15
LM3677-
ADJ
2
L1: 1.0 PH
SW
C1
EN 3
4 FB
C2
VOUT
R1
COUT
10 PF
R2
Figure 2. Typical Application Circuit - ADJ.
Version
Figure 3. Efficiency vs. Output Current
(VOUT = 1.8V)
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
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.
Copyright © 2007–2013, Texas Instruments Incorporated




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LM3677 Datasheet Preview

LM3677 Datasheet

600mA Miniature Step-Down DC-DC Converter

No Preview Available !

LM3677
SNVS502F – MARCH 2007 – REVISED MAY 2013
www.ti.com
DESCRIPTION (CONTINUED)
The device offers superior features and performance for mobile phones and similar portable applications with
complex power management systems. Automatic intelligent switching between PWM low-noise and PFM low-
current mode offers improved system control. During PWM mode operation, the device operates at a fixed
frequency of 3 MHz (typ). PWM mode drives loads from ~ 80 mA to 600 mA max. Hysteretic PFM mode extends
the battery life by reducing the quiescent current to 16 µA (typ.) during light load and standby operation. Internal
synchronous rectification provides high efficiency. In shutdown mode (Enable pin pulled down), the device turns
off and reduces battery consumption to 0.01 µA (typ.).
The LM3677 is available in a lead-free (NOPB) 5-bump DSBGA package and 6-pin USON package. A switching
frequency of 3 MHz (typ.) allows use of tiny surface-mount components. Only three external surface-mount
components, an inductor and two ceramic capacitors, are required.
CONNECTION DIAGRAMS
Vin A1
A3 GND
GND
A3
A1 Vin
B2 SW
EN C1
C3 FB
SW B2
FB C3
C1 EN
Top View
5-Bump DSBGA Package
See Package Number YZR0005
Bottom View
VIN 1
SW 2
EN 3
6 GND
5 SW
4 FB
6 GND
5 SW
4 FB
VIN 1
SW 2
EN 3
TOP VIEW
BOTTOM VIEW
6-Pin USON Package
See Package Number NGE0006A
Name
VIN
GND
EN
FB
SW
Pin No.
A1
A3
C1
1
6
3
C3 4
B2 2, 5
PIN DESCRIPTIONS(1)
Description
Power supply input. Connect to the input filter capacitor (Figure 1).
Ground pin.
Enable pin. The device is in shutdown mode when voltage to this pin is < 0.4V and
enabled when > 1.0V. Do not leave this pin floating.
Feedback analog input. Connect directly to the output filter capacitor ( FIGURE 1).
Switching node connection to the internal PFET switch and NFET synchronous
rectifier.
(1) For output voltage 1.2V or lower, input voltage needs to be derated to the range of 2.7V to 5.0V in order to perform within specification.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
2 Submit Documentation Feedback
Product Folder Links: LM3677
Copyright © 2007–2013, Texas Instruments Incorporated


Part Number LM3677
Description 600mA Miniature Step-Down DC-DC Converter
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