LM3671MF-1.8/NOPB National Semiconductor, LM3671MF-1.8/NOPB Datasheet

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LM3671MF-1.8/NOPB

Manufacturer Part Number
LM3671MF-1.8/NOPB
Description
IC CONV DC/DC STEP-DOWN SOT23-5
Manufacturer
National Semiconductor
Series
PowerWise®r
Type
Step-Down (Buck)r
Datasheet

Specifications of LM3671MF-1.8/NOPB

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
1.8V
Current - Output
600mA
Frequency - Switching
2MHz
Voltage - Input
2.7 ~ 5.5 V
Operating Temperature
-30°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
SOT-23-5, SC-74A, SOT-25
Power - Output
770mW
For Use With
LM3671MF-1.8EV - BOARD EVALUATION LM3671MF-1.8
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
LM3671MF-1.8
LM3671MF-1.8TR

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LM3671MF-1.8/NOPB
Manufacturer:
TI
Quantity:
12 000
© 2008 National Semiconductor Corporation
LM3671
2MHz, 600mA Step-Down DC-DC Converter
General Description
The LM3671 step-down DC-DC converter is optimized for
powering low voltage circuits from a single Li-Ion cell battery
and input voltage rails from 2.7V to 5.5V. It provides up to
600mA load current, over the entire input voltage range.
There are several different fixed voltage output options avail-
able as well as an adjustable output voltage version range
from 1.1V to 3.3V.
The device offers superior features and performance for mo-
bile phones and similar portable systems. Automatic intelli-
gent switching between PWM low-noise and PFM low-current
mode offers improved system control. During PWM mode, the
device operates at a fixed-frequency of 2 MHz (typ.). Hys-
teretic 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 ef-
ficiency during PWM mode operation. In shutdown mode, the
device turns off and reduces battery consumption to 0.01 µA
(typ.).
The LM3671 is available in SOT23-5, tiny 5-bump micro SMD
and a 6-pin LLP packages in leaded (PB) and lead-free (NO
PB) versions. A high switching frequency of 2 MHz (typ.) al-
lows use of tiny surface-mount components. Only three ex-
ternal surface-mount components, an inductor and two
ceramic capacitors, are required.
Typical Application Circuits
201084
FIGURE 1. Typical Application Circuit
Features
Applications
16 µA typical quiescent current
600 mA maximum load capability
2 MHz PWM fixed switching frequency (typ.)
Automatic PFM/PWM mode switching
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 (one inductor, two ceramic capacitors)
Current overload and Thermal shutdown protection
Available in fixed output voltages and adjustable version
SOT23-5, 5-bump micro SMD and 6-pin LLP packages
Mobile phones
PDAs
MP3 players
W-LAN
Portable instruments
Digital still cameras
Portable Hard disk drives
20108401
October 28, 2008
www.national.com

Related parts for LM3671MF-1.8/NOPB

LM3671MF-1.8/NOPB Summary of contents

Page 1

... PB) versions. A high switching frequency of 2 MHz (typ.) al- lows use of tiny surface-mount components. Only three ex- ternal surface-mount components, an inductor and two ceramic capacitors, are required. Typical Application Circuits © 2008 National Semiconductor Corporation Features ■ 16 µA typical quiescent current ■ 600 mA maximum load capability ■ ...

Page 2

Connection Diagram and Package Mark Information SOT23-5 Package NS Package Number MF05A (2.92mm x 2.84mm x 1.2mm) FIGURE 4. 5-Bump Micro SMD Package NS Package Number TLA05CBA (1.05mm x 1.38mm x 0.6mm) www.national.com FIGURE 2. Typical Application Circuit for ADJ ...

Page 3

FIGURE 5. 6-Pin LLP Package Number LCA06B (2mm x 2mm x 0.6mm) Pin Descriptions (SOT23-5) Pin # Name GND Pin Descriptions (5-Bump Micro SMD) Pin # Name ...

Page 4

... LM3671MFX-1.375 LM3671MF-1.375 LM3671MFX-1.375 1.5 LM3671MF-1.5 LM3671MFX-1.5 LM3671MF-1.5 LM3671MFX-1.5 1.6 LM3671MF-1.6 LM3671MFX-1.6 LM3671MF-1.6 LM3671MFX-1.6 1.8 LM3671MF-1.8 LM3671MFX-1.8 LM3671MF-1.8 LM3671MFX-1.8 1.875 LM3671MF-1.875 LM3671MFX-1.875 LM3671MF-1.875 LM3671MFX-1.875 2.5 LM3671MF-2.5 LM3671MFX-2.5 LM3671MF-2.5 LM3671MFX-2.5 2.8 LM3671MF-2.8 LM3671MFX-2.8 LM3671MF-2.8 LM3671MFX-2.8 3.3 LM3671MF-3.3 LM3671MFX-3.3 LM3671MF-3.3 LM3671MFX-3.3 www.national.com Spec Package Marking ...

Page 5

Ordering Information (5-bump Micro SMD) Voltage Option Order Number ADJ LM3671TL-ADJ LM3671TLX-ADJ LM3671TL-ADJ LM3671TLX-ADJ 1.2 LM3671TL-1.2 LM3671TLX-1.2 LM3671TL-1.2 LM3671TLX-1.2 1.5 LM3671TL-1.5 LM3671TLX-1.5 LM3671TL-1.5 LM3671TLX-1.5 1.8 LM3671TL-1.8 LM3671TLX-1.8 LM3671TL-1.8 LM3671TLX-1.8 1.875 LM3671TL-1.875 LM3671TLX-1.875 LM3671TL-1.875 LM3671TLX-1.875 2.5 LM3671TL-2.5 LM3671TLX-2.5 LM3671TL-2.5 LM3671TLX-2.5 2.8 ...

Page 6

... Input Voltage Range (Note 10) Recommended Load Current Junction Temperature (T ) Range J Ambient Temperature (T ) Range (Note A 5) Electrical Characteristics apply over the full operating ambient temperature range (−30°C the LM3671MF/TL/LC with 3.6V IN Symbol Parameter V Input Voltage IN V Feedback Voltage (Fixed Feedback Voltage (Fixed) TL ...

Page 7

Note 2: All voltages are with respect to the potential at the GND pin. Note 3: Internal thermal shutdown circuitry protects the device from permanent damage. Thermal shutdown engages 130°C (typ.). J Note 4: The Human ...

Page 8

Block Diagram www.national.com FIGURE 6. Simplified Functional Diagram 8 20108418 ...

Page 9

... Typical Performance Characteristics LM3671MF/TL/LC, Circuit of Figure 1, V Quiescent Supply Current vs. Supply Voltage Feedback Bias Current vs. Temp R vs. Temperature DS(ON) = 3.6V 1.5V 25°C, unless otherwise noted. IN OUT A 20108404 Switching Frequency vs. Temperature 20108440 Open/Closed Loop Current Limit vs. Temperature 20108433 9 Shutdown Current vs. Temp 20108405 ...

Page 10

Output Voltage vs. Supply Voltage (V = 1.5V) OUT Output Voltage vs. Temperature (V = 1.5V) OUT Output Voltage vs. Output Current (V = 1.5V) OUT www.national.com Output Voltage vs. Supply Voltage 20108429 Output Voltage vs. Temperature 20108406 Output Voltage ...

Page 11

Efficiency vs. Output Current (V = 1.5V, L= 2.2 µH) OUT 20108408 Efficiency vs. Output Current (V = 2.5V, L= 2.2 µH) OUT 20108441 Line Transient Response V = 1.5V (PWM Mode) OUT 20108412 Efficiency vs. Output Current (V = ...

Page 12

Load Transient Response V = 1.5V (PWM Mode) OUT Load Transient Response (V (PFM Mode 0.5mA to 50mA) Load Transient Response (V (PFM Mode 0.5mA to 50mA) www.national.com 20108413 = 1.5V) Load Transient Response (V OUT 20108414 = 2.5V) Load ...

Page 13

Mode Change by Load Transients V = 1.5V (PFM to PWM) OUT Mode Change by Load Transients V = 2.5V (PFM to PWM) OUT Start Up into PWM Mode V = 1.5V (Output Current= 300mA) OUT Mode Change by Load ...

Page 14

Start Up into PFM Mode V = 1.5V (Output Current= 1mA) OUT www.national.com Start Up into PFM Mode V = 2.5V (Output Current= 1mA) OUT 20108419 14 20108457 ...

Page 15

Operation Description DEVICE INFORMATION The LM3671, a high efficiency step down DC-DC switching buck converter, delivers a constant voltage from a single Li- Ion battery and input voltage rails from 2.7V to 5.5V to portable devices such as cell phones ...

Page 16

FIGURE 8. Typical PFM Operation During PFM operation, the converter positions the output volt- age slightly higher than the nominal output voltage during PWM operation, allowing additional headroom for voltage drop during a load transient from light to heavy load. ...

Page 17

Typical start-up times with a 10µF output capacitor and 300mA load is 400 µs and with 1mA load is 275µs. LDO - LOW DROP OUT OPERATION The LM3671-ADJ can operate at 100% duty cycle (no ...

Page 18

LM3671-ADJ Configurations For Various V (Refer to Note 11 for VIN requirements) V (V) R1(kΩ) OUT 0.90 160 1.1 240 1.2 280 1.3 320 1.5 357 1.6 442 1.7 432 1.8 464 1.875 523 2.5 402 2.8 464 3.3 562 ...

Page 19

... Micro SMD PACKAGE ASSEMBLY AND USE Use of the Micro SMD package requires specialized board layout, precision mounting and careful re-flow techniques, as detailed in National Semiconductor Application Note 1112. Refer to the section "Surface Mount Technology (SMD) As- sembly Considerations". For best results in assembly, align- ment ordinals on the PC board should be used to facilitate placement of the device ...

Page 20

The Micro SMD package is optimized for the smallest possi- ble size in applications with red or infrared opaque cases. ...

Page 21

21 www.national.com ...

Page 22

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 5-Lead SOT23-5 Package NS Package Number MF05A 5-Bump (Large) Micro SMD Package, 0.5mm Pitch NS Package Number TLA05CBA The dimensions for X1, X2, and X3 are as given 1.057 mm ...

Page 23

LLP Package, 0.5mm Pitch NS Package Number LCA06B The dimensions for X1, X2, and X3 are as given 2.000 mm +/- 0.100mm X2 = 2.000 mm +/- 0.100mm X3 = 0.600 mm +/- 0.075mm 23 www.national.com ...

Page 24

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock Conditioners www.national.com/timing Data Converters www.national.com/adc Displays www.national.com/displays Ethernet www.national.com/ethernet Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www ...

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