Texas Instruments LM3670MF, LM3670MF-1.2, LM3670MF-1.5, LM3670MF-1.6, LM3670MF-1.8 User Manual [ru]
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1
2
5
4
3
V
IN
SW
FB
EN
GND
L1
4.7 or 10 µH
V
OUT
C
IN
4.7 µF
LM3670
V
IN
2.5 V to 5.5 V
R
1
R
2
C
OUT
10 µF
1
2
5
43
V
IN
SW
FB
EN
GND
L1
10 µF
V
OUT
C
IN
4.7 µF
LM3670
V
IN
2.5 V to 5.5 V
C
OUT
10 µF
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LM3670
SNVS250F –NOVEMBER 2004–REVISED FEBRUARY 2016
LM3670 Miniature Step-Down DC-DC Converter for Ultralow Voltage Circuits
1 Features
1
• Input Voltage Range: 2.5 V to 5.5 V
• Adjustable Output Voltages (V
): 0.7 V to 2.5 V
OUT
• Fixed Output Voltages: 1.2 V, 1.5 V, 1.6 V, 1.8 V,
1.875 V, 3.3V
• 15-µA Typical Quiescent Current
• 350-mA Maximum Load Capability
• 1-MHz PWM Fixed Switching Frequency (Typical)
• Automatic PFM and PWM Mode Switching
• Low Dropout Operation – 100% Duty Cycle Mode
• Internal Synchronous Rectification for High
Efficiency
• Internal Soft Start
• 0.1-µA Typical Shutdown Current
• Current Overload Protection
• Operates from a Single Li-Ion Cell or Three-Cell
NiMH/NiCd Batteries
• Only Three Tiny Surface-Mount External
Components Required (One Inductor, Two
Ceramic Capacitors)
2 Applications
• Mobile Phones and Handheld Devices
• PDAs
• Palm-Top PCs
• Portable Instruments
• Battery-Powered Devices
Typical Application: Fixed Output
3 Description
The LM3670 step-down DC-DC converter is
optimized for powering ultralow voltage circuits from a
single Li-Ion cell or three-cell NiMH/NiCd batteries. It
provides up to 350-mA load current, over an input
voltage range from 2.5 V to 5.5 V. There are several
different fixed voltage output options available as well
as an adjustable output voltage version.
The device offers superior features and performance
for mobile phones and similar portable applications
with complex power management systems. Automatic
intelligent switching between pulse width modulation
(PWM) low-noise and pulse frequency modulation
(PFM) low-current mode offers improved system
control. During full-power operation, a fixed-frequency
1-MHz (typical) PWM mode drives loads from
approximately 70 mA to 350 mA maximum, with up to
95% efficiency. Hysteretic PFM mode extends the
battery life through reduction of the quiescent current
to 15 µA (typical) during light current loads and
system standby. Internal synchronous rectification
provides high efficiency (90% to 95% typical at loads
between 1 mA and 100 mA). In shutdown mode
(enable (EN) pin pulled low) the device turns off and
reduces battery consumption to 0.1 µA (typical).
The LM3670 is available in a 5-pin SOT-23 package.
A high switching frequency (1 MHz typical) allows use
of tiny surface-mount components. Only three
external surface-mount components, an inductor and
two ceramic capacitors, are required.
Device Information
PART NUMBER PACKAGE BODY SIZE (NOM)
LM3670 SOT-23 (5) 2.90 mm × 1.60 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
space
space
Typical Application: Adjustable Output Voltage
(1)
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
LM3670
SNVS250F –NOVEMBER 2004–REVISED FEBRUARY 2016
www.ti.com
Table of Contents
1 Features.................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Connection Diagram.............................................. 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information.................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 Typical Characteristics.............................................. 7
7 Detailed Description............................................ 10
7.1 Overview................................................................. 10
7.2 Functional Block Diagram....................................... 10
7.3 Feature Description................................................. 11
7.4 Device Functional Modes........................................ 12
8 Application and Implementation ........................ 14
8.1 Application Information............................................ 14
8.2 Typical Application ................................................. 14
9 Power Supply Recommendations...................... 18
10 Layout................................................................... 19
10.1 Layout Guidelines ................................................. 19
10.2 Layout Example .................................................... 20
11 Device and Documentation Support ................. 21
11.1 Device Support .................................................... 21
11.2 Community Resources.......................................... 21
11.3 Trademarks........................................................... 21
11.4 Electrostatic Discharge Caution............................ 21
11.5 Glossary................................................................ 21
12 Mechanical, Packaging, and Orderable
Information........................................................... 21
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision E (February 2013) to Revision F Page
• Changed "(0.7V min) to "0.7 V to 2.5 V" ................................................................................................................................ 1
• Added Device Information and Pin Configuration and Functions sections, ESD Ratings and Thermal Information
tables, Feature Description, Device Functional Modes, Application and Implementation, Power Supply
Recommendations, Layout, Device and Documentation Support, and Mechanical, Packaging, and Orderable
Information sections................................................................................................................................................................ 1
• Deleted phone and fax numbers of manufacturers from suggested inductors table ........................................................... 15
• Deleted phone and fax numbers of manufacturers from suggested capacitors table ......................................................... 16
• Deleted rest of text from paragraph beginning "For any output voltages...."........................................................................ 17
• Deleted row beginning with "1.24... "from Table 3 .............................................................................................................. 18
Changes from Revision D (February 2013) to Revision E Page
• Changed layout of National Data Sheet to TI format ........................................................................................................... 19
2
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Product Folder Links: LM3670
V
IN
1
GND2EN
3
FB
4
SW
5
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5 Connection Diagram
PIN
NUMBE
R
1 V
NAME
IN
2 GND Ground Ground pin.
3 EN Digital Enable input.
4 FB
5 SW Analog
TYPE DESCRIPTION
Power
Analog
Power supply input. Connect to the input filter capacitor
( Typical Application: Fixed Output).
Feedback analog input. Connect to the output filter capacitor
(Typical Application: Fixed Output).
Switching node connection to the internal PFET switch and NFET synchronous rectifier.
Connect to an inductor with a saturation current rating that exceeds the 750-mA maximum
switch peak current limit specification.
LM3670
SNVS250F –NOVEMBER 2004–REVISED FEBRUARY 2016
DBV Package
5-Pin SOT-23
Top View
Pin Functions
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SNVS250F –NOVEMBER 2004–REVISED FEBRUARY 2016
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6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)
VINpin: voltage to GND –0.2 6 V
EN pin: voltage to GND –0.2 6 V
FB, SW pins (GND −0.2) VIN+ 0.2 V
Junction temperature, T
J-MAX
Maximum lead temperature (soldering, 10 seconds) 260 °C
Storage temperature, T
stg
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) If Military/Aerospace specified devices are required, contact the TI Sales Office/Distributors for availability and specifications.
6.2 ESD Ratings
Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001
V
(ESD)
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
Electrostatic discharge
Charged-device model (CDM), per JEDEC specification JESD22-
(2)
C101
(1)(2)
MIN MAX UNIT
–45 125 °C
–45 150 °C
VALUE UNIT
(1)
±2000
±200
V
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
Input voltage 2.5 5.5 A
Recommended load current 0 350 mA
Junction temperature, T
Ambient temperature, T
(1) All voltages are with respect to the potential at the GND pin.
J
A
(1)
MIN NOM MAX UNIT
–40 125 °C
–40 85 °C
6.4 Thermal Information
LM3670
THERMAL METRIC
R
θJA
R
θJC(top)
R
θJB
ψ
JT
ψ
JB
Junction-to-ambient thermal resistance 163.3 °C/W
Junction-to-case (top) thermal resistance 114.3 °C/W
Junction-to-board thermal resistance 26.8 °C/W
Junction-to-top characterization parameter 12.4 °C/W
Junction-to-board characterization parameter 26.3 °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report, SPRA953.
(1)
UNITDBV (SOT-23)
5 PINS
4
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SNVS250F –NOVEMBER 2004–REVISED FEBRUARY 2016
6.5 Electrical Characteristics
Unless otherwise specified, limits for typical values are TJ= 25°C, and minimum and maximum limits apply over the full
operating junction temperature range (−40°C ≤ TJ≤ +125°C); VIN= 3.6 V, V
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
IN
Input voltage See
Fixed output voltage: 1.2 V
Fixed output voltage: 1.5 V
Fixed output voltage: 1.6 V, 1.875 V
V
OUT
Fixed output voltage: 1.8 V
Fixed output voltage: 3.3 V
Adjustable output voltage
(2)
Line_reg Line regulation
Load_reg Load regulation 150 mA ≤ I
V
REF
I
Q_SHDN
I
Q
V
UVLO
R
DSON (P)
R
DSON (N)
I
LKG (P)
I
LKG (N)
I
LIM
Internal reference voltage 0.5 V
Shutdown supply current TA= 85ºC 0.1 1 µA
DC bias current into V
Minimum VINbelow which V
disabled
IN
is
OUT
Pin-pin resistance for PFET VIN= VGS= 3.6V 360 690 mΩ
Pin-pin resistance for NFET VIN= VGS= 3.6 V 250 660 mΩ
P channel leakage current VDS= 5.5 V, TA= 25°C 0.1 1 µA
N channel leakage current VDS= 5.5 V, TA= 25°C 0.1 1.5 µA
Switch peak current limit 400 620 750 mA
(1)
2.5 V ≤ VIN≤ 5.5 V
I
= 10 mA
OUT
2.5 V ≤ VIN≤ 5.5 V
0 mA ≤ I
OUT
≤ 150 mA
2.5 V ≤ VIN≤ 5.5 V
I
= 10 mA
OUT
2.5 V ≤ VIN≤ 5.5 V
0 mA ≤ I
OUT
≤ 350 mA
2.5 V ≤ VIN≤ 5.5 V
I
= 10 mA
OUT
2.5 V ≤ VIN≤ 5.5V
0 mA ≤ I
OUT
≤ 350 mA
2.5 V ≤ VIN≤ 5.5 V
I
= 10 mA
OUT
2.5 V ≤ VIN≤ 5.5 V
0 mA ≤ I
OUT
≤ 350 mA
3.6 V ≤ VIN≤ 5.5 V
I
= 10 mA
OUT
3.6V ≤ VIN≤ 5.5V
0 mA ≤ I
OUT
≤ 350 mA
2.5 V ≤ VIN≤ 5.5 V
I
= 10 mA
OUT
2.5 V ≤ VIN≤ 5.5 V
0 mA ≤ I
OUT
≤ 150 mA
2.5 V ≤ VIN≤ 5.5 V
I
= 10 mA
OUT
≤ 350 mA 0.0014 %/mA
OUT
No load, device is not switching
(V
forced higher than
OUT
programmed output voltage)
TA= −40°C ≤ TJ≤ 125°C 2.4 V
OUT
= 1.8 V, I
–4.5%
–2.5%
–2.5%
–5.5%
–1.5%
–4.5%
–2.5%
= 150 mA, EN = VIN.
OUT
2.5 5.5 V
–2%
4%
4%
4%
–5%
4%
4%
4%
3%
3%
–2%
–6%
4%
4%
4.5%
–4%
4.5%
0.26 %/V
15 30 µA
(1) The input voltage range recommended for the specified output voltages are given below: VIN= 2.5 V to 5.5 V for 0. 7 V ≤ V
V, VIN= ( V
(2) Output voltage specification for the adjustable version includes tolerance of the external resistor divider.
OUT
+ V
DROPOUT
) to 5.5 for 1.875 ≤ V
≤ 3.3 V, where V
OUT
DROPOUT
= I
LOAD
× (R
DSON (P)
+ R
INDUCTOR
).
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OUT
< 1.875
5
LM3670
SNVS250F –NOVEMBER 2004–REVISED FEBRUARY 2016
www.ti.com
Electrical Characteristics (continued)
Unless otherwise specified, limits for typical values are TJ= 25°C, and minimum and maximum limits apply over the full
operating junction temperature range (−40°C ≤ TJ≤ +125°C); VIN= 3.6 V, V
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
η Efficiency
V
V
I
ƒ
IH
IL
EN
OSC
Logic high input 1.3 V
Logic low input 0.4 V
Enable (EN) input current 0.01 1 µA
Internal oscillator frequency PWM mode 550 1000 1300 kHz
VIN= 3.6 V, V
I
= 1 mA
LOAD
VIN= 3.6 V, V
I
= 10 mA
LOAD
VIN= 3.6 V, V
I
= 100 mA
LOAD
VIN= 3.6 V, V
I
= 200 mA
LOAD
VIN= 3.6 V, V
I
= 300 mA
LOAD
VIN= 3.6 V, V
I
= 350 mA
LOAD
OUT
OUT
OUT
OUT
OUT
OUT
= 1.8 V
= 1.8 V
= 1.8 V
= 1.8 V
= 1.8 V
= 1.8 V
OUT
= 1.8 V, I
= 150 mA, EN = VIN.
OUT
91%
94%
94%
94%
92%
90%
6
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I
LOAD
(mA)
40
45
50
55
60
65
70
75
80
85
90
95
100
EFFICIENCY (%)
VIN = 5.0V
VIN = 2.7V
VIN = 3.7V
10
3
10
2
10
1
10
-2
10
-1
10
0
2.5 3 3.5 4 4.5 5 5.5 6
VIN (V)
75
80
85
90
95
100
70
EFFICIENCY (%)
I
LOAD
= 1 mA
I
LOAD
= 300 mA
I
LOAD
= 150 mA
0 50 100 150 200 250 300 350
I
LOAD
(mA)
1.7
1.72
1.74
1.76
1.78
1.8
1.82
1.84
1.86
1.88
1.9
V
OUT
(V)
PFM Mode
PWM Mode
-40
TEMPERATURE (°C)
1.77
1.78
1.79
1.80
1.81
1.82
1.83
V
OUT
(V)
806040200-20
I
OUT
= 10 mA
PFM mode
I
OUT
= 150 mA
PWM mode
VIN = 3.6V
VIN = 2.5V
VIN = 3.6V
VIN = 5.5V
2.5 3 3.5 4 4.5 5 5.5
VIN (V)
10
15
20
NO LOAD I
QUIESCENT
(PA)
TA = 85°C
TA = 25°C
TA = -40°C
-40 -20 0 20 40 60 80
TEMPERATURE (°C)
0
0.05
0.1
I
SHUTDOWN
(PA)
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6.6 Typical Characteristics
Unless otherwise stated, VIN= 3.6 V and V
OUT
LM3670
SNVS250F –NOVEMBER 2004–REVISED FEBRUARY 2016
= 1.8 V.
Figure 1. IQ(Non-Switching) vs V
Figure 3. V
OUT
vs V
IN
IN
Figure 2. IQvs Temperature
Figure 4. V
OUT
vs I
OUT
Figure 5. Efficiency vs I
OUT
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Figure 6. Efficiency vs V
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IN
7
V
OUT
(50 mV/Div)
I
LOAD
= 280 mA
TIME (100 Ps/DIV)
CURRENT LOAD STEP (3 mA - 280 mA)
I
LOAD
= 3 mA
V
OUT
(50 mV/Div)
I
LOAD
= 70 mA
TIME (100 Ps/DIV)
CURRENT LOAD STEP (0 mA - 70 mA)
I
LOAD
= 0 mA
Inductor Current = 200 mA/Div
VIN= 3.6V
VIN= 4.6V
TIME (100 ms/DIV)
LINE T
RANSIENT
V
OUT
= 1.8V
(20 mV/Div)
V
OUT
= 1.8V
I
OUT
= 100 mA
VINrisetime= 10 ms
VIN= 3.6V
TIME (200 ms/DIV)
LINE T
RANSIENT
VIN= 2.6V
(20 mV/Div)
2.5 3 3.5 4 4.5 5 5.5
VIN (V)
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
R
DSon
- N, P CHANNEL (:)
N FET
P FET
TA = 85°C
TA = 25°C
TA = -40°C
-40 -20
-10
0 10 20 30 40 50 60 70 80
TEMPERATURE (°C)
840
850
860
870
880
890
900
910
920
930
940
950
960
970
980
990
1000
1010
FREQUENCY (kHz)
-30
I
LOAD
= 150 mA
VIN = 2.5V
VIN = 5.5V
VIN = 3.6V
LM3670
SNVS250F –NOVEMBER 2004–REVISED FEBRUARY 2016
Typical Characteristics (continued)
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Unless otherwise stated, VIN= 3.6 V and V
Figure 7. Frequency vs Temperature
OUT
= 1.8 V.
Figure 8. R
vs. VINP and N Channels
DSON
VIN= 2.6 V to 3.6 V I
8
I
= 3 mA to 280 mA
LOAD
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= 100 mA
LOAD
Figure 9. Line Transient
Figure 11. Load Transient
VIN= 3.6 V to 4.6 V I
I
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= 0 mA to 70 mA
LOAD
= 100 mA
LOAD
Figure 10. Line Transient
Figure 12. Load Transient
TIME (100 Ps/DIV)
CURRENT LOAD STEP (3 mA - 280 mA)
VIN (2V/Div)
V
OUT
(1V/Div)
(200 mA/
Div)
Inductor
Current
TIME (2 Ps/DIV)
PFM MODE
V
SWITCH
(5V/Div)
V
OUT
(20 mV/Div)
Inductor Current
(100 mA/Div)
TIME (1 Ps/DIV)
PWM MODE
V
SWITCH
(5V/Div)
V
OUT
(20 mV/Div)
Inductor Current
(200 mA/Div)
I
LOAD
= 150 mA
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Typical Characteristics (continued)
LM3670
SNVS250F –NOVEMBER 2004–REVISED FEBRUARY 2016
Unless otherwise stated, VIN= 3.6 V and V
Figure 13. PFM Mode VSW, V
OUT
, I
= 1.8 V.
OUT
INDUCTOR
vs Time Figure 14. PWM Mode VSW, V
OUT
, I
INDUCTOR
vs Time
I
LOAD
= 350 mA
Figure 15. Soft Start VIN, V
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OUT
, I
INDUCTOR
vs Time
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