LM3370   
Dual Synchronous Step-Down DC-DC Converter with Dynamic Voltage Scaling Function from the PowerWise® Family		 Click link to Download

Features
•I 2C compatible interface
•VOUT1 = 1V to 2V in 50 mV steps
•VOUT2 = 1.8V to 3.3V in 100 mV steps
•Automatic PFM/PWM mode switching & Forced PWM mode for low noise operation
•Spread Spectrum capability using I 2C
•600 mA load per channel
•2 MHz PWM fixed switching frequency (typ.)
•Internal synchronous rectification for high efficiency
•Internal soft start
•Power-on-reset function for both outputs
•2.7V ≤ VIN ≤ 5.5V
•Operates from a single Li-Ion cell or 3 cell NiMH/NiCd batteries and 3.3V/5.5V fixed rails
•2.2 µH Inductor, 4.7 µF Input and 10 µF Output Capacitor per channel
•16-lead LLP Package (4 mm x 5 mm x 0.8 mm)
•20-Bump micro SMD Package (3.0 mm x 2.0 mm x 0.6 mm)

Description

The LM3370 is a dual step-down DC-DC converter optimized for powering ultra-low voltage circuits from a single Li-Ion battery and input rail ranging from 2.7V to 5.5V. It provides two outputs with 600 mA load per channel. The output voltage range varies from 1V to 3.3V and can be dynamically controlled using the I 2C compatible interface. This dynamic voltage scaling function allows processors to achieve maximum performance at the lowest power level. The I 2C compatible interface can also be used to control auto PFM-PWM/PWM mode selection and other performance enhancing features.

The LM3370 offers superior features and performance for portable systems with complex power management requirements. Automatic intelligent switching between PWM low-noise and PFM low-current mode offers improved system efficiency. Internal synchronous rectification enhances the converter efficiency without the use of further external devices.

There is a power-on-reset function that monitors the level of the output voltage to avoid unexpected power losses. The independent enable pin for each output allows for simple and effective power sequencing.

LM3370 is available in a 4 mm by 5 mm 16-lead non-pullback LLP and a 20-Bump micro SMD, 3.0 mm x 2.0 mm x 0.6 mm, package. A high switching frequency—2 MHz (typ)—allows use of tiny surface-mount components including a 2.2 µH inductor.

Default fixed voltages for the 2 output voltages combination can be customized to fit system requirements by contacting National Semiconductor Corporation.

Applications
•Baseband Processors
•Application Processors (Video, Audio)
•I/O Power
•FPGA Power and CPLD



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                                              LM3370
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Typical Application
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Block Diagram
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Typical Performance
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ParametersValues
Channels 2 Channels
Output Range 1V-3.3V, 1V to 2V for buck 1; 1.8V to 3.3V for buck 2
Output1 Topology Buck
Output2 Topology Buck
Input Min Voltage 2.7 Volt
Input Max Voltage 5.5 Volt
Frequency Min 2000, 1500 kHz
Frequency Max 2400, 2000 kHz
Efficiency (peak) 90 %
Adj Switch Frequency No, Yes
Output1 VoutMin 1 Volt
Output1 VoutMax 2 Volt
Output1 IoutMax 600 mA
Output2 VoutMin 1.8, 2 Volt
Output2 VoutMax 3.3 Volt
Output2 IoutMax 600 mA
Sync Pin No
MOSFET Rdson NFET 0.24ohm, PFET 0.39ohm
SoftStart Yes
On/Off Pin Yes
Error Flag No
Special Features I2C interface, Dynamic Voltage Scaling
Topology Buck, Voltage Mode
RegType Switching Regulator
Step-Down Yes
Step-Up No
Inverting No
Flyback No
Switching Frequency 2000 kHz
Multiple Output Capability Yes
Temperature Min -30 deg C
Temperature Max 85 deg C
PowerWise Yes

Datasheet
TitleSizeDateOther
Language
LM3370 Dual Synchronous Step-Down DC-DC Converter with Dynamic Voltage Scaling Function5414
Kbytes		4-Jan-08 


Featured Application Notes
TitleSizeDateOther
Language
AN-1428: Application Note 1428 LM3370 Evaluation Board11933
Kbytes		9-Jan-08 中文
AN-1840: Application Note 1840 USB I 2 C Interface Board Reference Manual2769
Kbytes		30-Apr-08 


More Application Notes
TitleSizeDateOther
Language
AN-1428: Application Note 1428 LM3370 Evaluation Board11933
Kbytes		9-Jan-08 中文
AN-74: Application Note 74 LM139/LM239/LM339 A Quad of Independently Functioning Comparators702
Kbytes		1-Oct-02 
AN-298: Application Note 298 Isolation Techniques for Signal Conditioning379
Kbytes		2-Oct-02 
AN-242: Application Note 242 Applying a New Precision Op Amp383
Kbytes		4-Oct-04 
AN-225: Application Note 225 IC Temperature Sensor Provides Thermocouple Cold-Junction Compensation89
Kbytes		2-Oct-02 
AN-295: Application Note 295 A High Performance Industrial Weighing System117
Kbytes		4-Oct-04 
AN-272: Application Note 272 Op Amp Booster Designs382
Kbytes		2-Oct-02 
AN-286: Application Note 286 Applications of the LM392 Comparator Op Amp IC135
Kbytes		2-Oct-02 
AN-240: Application Note 240 Wide-Range Current-to-Frequency Converters126
Kbytes		3-Oct-02 
AN-C: Application Note C V/F Converter ICs Handle Frequency-to-Voltage Needs187
Kbytes		3-Oct-02 
AN-D: Application Note D Versatile Monolithic V/Fs can Compute as Well as Convert with High Accuracy248
Kbytes		3-Oct-02 
AN-288: Application Note 288 System-Oriented DC-DC Conversion Techniques405
Kbytes		3-Oct-02 
AN-275: Application Note 275 CMOS D/A Converters Match Most Microprocessors127
Kbytes		2-May-04 
AN-247: Application Note 247 Using the ADC0808/ADC0809 8-Bit µP Compatible A/D Converters with 8-Channel Analog Multiplexer547
Kbytes		3-Oct-02 
AN-256: Application Note 256 Circuitry for Inexpensive Relative Humidity Measurement119
Kbytes		2-Oct-02 
AN-285: Application Note 285 An Acoustic Transformer Powered Super‐High Isolation Amplifier172
Kbytes		4-Oct-04 
AN-258: Application Note 258 Data Acquisition Using the ADC0816 and ADC0817 8-Bit A/D Converter with On-Chip 16 Channel Multiplexer683
Kbytes		4-Oct-04 
AN-284: Application Note 284 Single-Supply Applications of CMOS MICRODACs121
Kbytes		3-Oct-02 
AN-673: 2-Way Multiplexed LCD Drive and Low Cost A/D-Converter Using V/F Techniques with COP8 Microcontrollers526
Kbytes		5-Aug-95 
AN-265: Application Note 265 An Electronic Watt-Watt-Hour Meter185
Kbytes		3-Oct-02 
AN-274: Application Note 274 CMOS A/D Converter Interfaces Easily with Many Microprocessors73
Kbytes		3-Oct-02 
AN-210: Application Note 210 New Phase-Locked-Loops Have Advantages as Frequency to Voltage Converters (and more)339
Kbytes		3-Oct-02 
AN-301: Application Note 301 Signal Conditioning for Sophisticated Transducers579
Kbytes		2-Oct-02 

Part Number(s)
(NSID)		Top ViewAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM3370SD-3013/NOPB

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide1743
FARNELLEurope and Asia1030
$1.35 each at 1K+ pcsreel
of
1000
LM3370SD-3416/NOPB

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide1994
FARNELLEurope and Asia50
$1.35 each at 1K+ pcsreel
of
1000
LM3370SD-3621/NOPB

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide994
$1.35 each at 1K+ pcsreel
of
1000
LM3370SD-3806/NOPB

RoHS

Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide1997
FARNELLEurope and Asia50
$1.35 each at 1K+ pcsreel
of
1000
LM3370SD-4221/NOPB

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
AVNET-EMWorldwide1000
DIGIKEYWorldwide1696
FARNELLEurope and Asia720
$1.35 each at 1K+ pcsreel
of
1000
LM3370SD-3021/NOPB

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide2689
FARNELLEurope and Asia1000
KEIKONGAsia Pacific1000
RS COMPONENTSWorldwide20
$1.35 each at 1K+ pcsreel
of
1000
LM3370SDX-3013/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.35 each at 1K+ pcsreel
of
4500
LM3370SDX-3416/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.35 each at 1K+ pcsreel
of
4500
LM3370SDX-3621/NOPB

RoHS

Full production
Lead Time: 12 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.35 each at 1K+ pcsreel
of
4500
LM3370SDX-3806/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.35 each at 1K+ pcsreel
of
4500
LM3370SDX-4221/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.35 each at 1K+ pcsreel
of
4500
LM3370SDX-3021/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.35 each at 1K+ pcsreel
of
4500
LM3370TL-3006/NOPB

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide444
$1.35 each at 1K+ pcsreel
of
250
LM3370TL-3008/NOPB

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide500
$1.35 each at 1K+ pcsreel
of
250
LM3370TL-3022/NOPB

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide750
$1.35 each at 1K+ pcsreel
of
250
LM3370TL-3206/NOPB

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide500
$1.35 each at 1K+ pcsreel
of
250
LM3370TL-3607/NOPB

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide500
$1.35 each at 1K+ pcsreel
of
250
LM3370TL-3806/NOPB

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide500
$1.35 each at 1K+ pcsreel
of
250
LM3370TLX-3006/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.35 each at 1K+ pcsreel
of
3000
LM3370TLX-3008/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.35 each at 1K+ pcsreel
of
3000
LM3370TLX-3022/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.35 each at 1K+ pcsreel
of
3000
LM3370TLX-3206/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.35 each at 1K+ pcsreel
of
3000
LM3370TLX-3607/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.35 each at 1K+ pcsreel
of
3000
LM3370TLX-3806/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.35 each at 1K+ pcsreel
of
3000

Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
I2C-CPEV
USB I2C Interface BoardFull production


 
DistributorRegionQty
DIGIKEYWorldwide0
NATIONALWorldwide0
CALLN/A

Description:

The USB I2C Interface board interacts with your application hardware via an USB port in a PC. The Microcontroller with flash
memory enables to control your application hardware and develop specific application functions via software. (National
Semiconductor does not provide interaction software, which networks both application board and I2C board.)USB I2C Interface
Board Key

Features:

  • National's COP8CBE9 microcontroller in a TSSOP package
  • National's USBN9604 IC in a 28-pin CSP package
  • USB 2.0 compatible
  • Bus Powered
  • 24 MHz clock from crystal
  • 8-pin Analog inputs for A/D converter

System Requirements:

The following requirements are vital in order to use the USB I2C Interface Module:

  • Windows Operating System (Win98/ME/2000/XP)
  • 32 MB RAM (Minimum)
  • 2 MB available for disk space

Hardsware Requirement:

  • 5-Pin Mini-B USB 2.0 cable (sold separately)

Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM3370TL-3008EV
LM3370 (micro SMD) Dual Synchronous Regulator with Dynamic Voltage Scaling Evaluation BoardFull production
Lead Free (RoHS)

 
DistributorRegionQty
DIGIKEYWorldwide0
NATIONALWorldwide24
CALLN/A
LM3370 (micro SMD) Dual Synchronous Regualtor with Dynamic Voltage Scaling Evaluation Board

The LM3370TL Evaluation Board

The LM3370TL micro SMD evaluation board is pre-programmed to 1.2V at VOUT1 and 2.0V at VOUT2 for evaluation purpose (no additional interface hardware is needed). If a different default output option is desired, the same evaluation board can be used by demounting the existing device and replacing it?with new voltage option ( voltage option can be order from National's website). The device comes with the following default setting:

  • Auto PFM and PWM transition mode when the I2C compatible interface is not enabled.
  • For other settings, I2C compatible interface must be used to enable all other functions.

General Description
The LM3370 is a dual step-down DC-DC converter optimized for powering ultra-low voltage circuits from a single Li-Ion battery and input rail ranging from 2.7V to 5.5V. It provides two outputs with 600mA load per channel. The output voltage range varies from 1V to 3.3V and can be dynamically controlled using the I2C compatible interface. This dynamic voltage scaling function allows processors to achieve maximum performance at the lowest power level. The I2C compatible interface can also be used to control auto PFM-PWM/PWM mode selection and other performance enhancing features.

The LM3370 offers superior features and performance for portable systems with complex power management requirements. Automatic intelligent switching between PWM low-noise and PFM low-current mode offers improved system efficiency. Internal synchronous rectification enhances the converter efficiency without the use of further external devices. The LM3370 evaluation board is a working demonstration of a DUAL step down DC-DC converter.

LM3370 Features

  • I2C compatible interface
    • VOUT1= 1V to 2V in 50mV steps
    • VOUT2 = 1.8V to 3.3V in 100mV steps
    • Automatic PFM/PWM mode switching and Forced PWM mode for low noise operation
    • Spread Spectrum capability using I2C
  • 600mA load per channel
  • 2MHz PWM fixed switching frequency
  • Internal soft start
  • Power-on-reset function for both outputs
  • 2.7V≤ VIN ≤ 5.5V
  • Operates from a single Li-Ion cell or 3 cell NiMH/NiCd batteries and 3.3V/5.5V fixed rails
  • 2.2?H Inductor, 4.7?F Input and 10?F Output Capacitor per channel
  • 16-lead LLP Package (4mm x 5mm x 0.8 mm)

LM3370 Applications

  • Baseband Processors
  • Application Processors (Video, Audio)
  • I/O Power
  • FPGA Power and CPLD

Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM3370SD-3021EV
LM3370 (LLP) Dual Synchronous Regulator with Dynamic Voltage Scaling Evaluation BoardFull production


 
DistributorRegionQty
DIGIKEYWorldwide0
NATIONALWorldwide125
$60.00 each1

The LM3370SD Evaluation Board

The LM3370SD LLP evaluation board is pre-programmed to 1.2V at VOUT1 and 3.3V at VOUT2 for evaluation purpose (no additional interface hardware is needed). If a different default output option is desired, the same evaluation board can be used by demounting the existing device and replacing it with new voltage option ( voltage option can be order from National's website). The device comes with the following default setting:

  • Auto PFM and PWM transition mode when the I2C compatible interface is not enabled.
  • For other settings, I2C compatible interface must be used to enable all other functions.

The LM3370 is a dual step-down DC-DC converter optimized for powering ultra-low voltage circuits from a single Li-Ion battery and
input rail ranging from 2.7V to 5.5V. It provides two outputs with 600mA load per channel. The output voltage range varies from 1V
to 3.3V and can be dynamically controlled using the I2C compatible interface. This dynamic voltage scaling function allows processors
to achieve maximum performance at the lowest power level. The I2C compatible interface can also be used to control auto PFM-PWM/
PWM mode selection and other performance enhancing features.

The LM3370 offers superior features and performance for portable systems with complex power management requirements. Automatic
intelligent switching between PWM low-noise and PFM low-current mode offers improved system efficiency. Internal synchronous
rectification enhances the converter efficiency without the use of further external devices.

LM3370 Features:

  • I2C compatible interface
          ---VOUT1= 1V to 2V in 50mV steps
          ---VOUT2= 1.8V to 3.3V in 100mV steps
          ---Automatic PFM/PWM mode switching and Forced PWM mode for low noise operation
          ---Spread Spectrum capability using I2C
  • 600mA load per channel
  • 2MHz PWM fixed switching frequency
  • Internal soft start
  • Power-on-reset function for both outputs
  • 2.7V less than or equal to VIN less than or equal to 5.5V
  • Operates from a single Li-Ion cell or 3 cell NiMH/NiCd batteries and 3.3V/5.5V fixed rails
  • 2.2microH Inductor, 4.7microF Input and 10microF Output Capacitor per channel
  • 16-lead LLP Package (4mm x 5mm x 0.8 mm)
LM3370 Applications:
  • Baseband Processors
  • Application Processors (Video, Audio)
  • I/O Power FPGA Power and CPLD

Part Number(s)
(NSID)		Top ViewTypePinsMSL RatingPeak ReflowRoHSCAD SymbolsModelsPackage
Marking
Format
LM3370SD-3013/NOPB
LLP161260RoHSDownloadN/A
NS
UZXYTT
S0003UB
LM3370SD-3416/NOPB
LLP161260RoHSDownloadN/A
NS
UZXYTT
S0003VB
LM3370SD-3621/NOPB
LLP161260RoHSDownloadN/A
NS
UZXYTT
S0004AB
LM3370SD-3806/NOPB
LLP161260RoHSDownloadN/A
NS
UZXYTT
S0003XB
LM3370SD-4221/NOPB
LLP161260RoHSDownloadN/A
NS
UZXYTT
S0003YB
LM3370SD-3021/NOPB
LLP161260RoHSDownloadN/A
NS
UZXYTT
S0003TB
LM3370SDX-3013/NOPB
LLP161260RoHSDownloadN/A
NS
UZXYTT
S0003UB
LM3370SDX-3416/NOPB
LLP161260RoHSDownloadN/A
NS
UZXYTT
S0003VB
LM3370SDX-3621/NOPB
LLP161260RoHSDownloadN/A
NS
UZXYTT
S0004AB
LM3370SDX-3806/NOPB
LLP161260RoHSDownloadN/A
NS
UZXYTT
S0003XB
LM3370SDX-4221/NOPB
LLP161260RoHSDownloadN/A
NS
UZXYTT
S0003YB
LM3370SDX-3021/NOPB
LLP161260RoHSDownloadN/A
NS
UZXYTT
S0003TB
LM3370TL-3006/NOPB
MICRO SMD201260RoHSDownloadN/A
XYTT
I SPUB
LM3370TL-3008/NOPB
MICRO SMD201260RoHSDownloadN/A
XYTT
I SPTB
LM3370TL-3022/NOPB
MICRO SMD201260RoHSDownloadN/A
XYTT
I STHB
LM3370TL-3206/NOPB
MICRO SMD201260RoHSDownloadN/A
XYTT
I SPXB
LM3370TL-3607/NOPB
MICRO SMD201260RoHSDownloadN/A
XYTT
I SPSB
LM3370TL-3806/NOPB
MICRO SMD201260RoHSDownloadN/A
XYTT
I SPVB
LM3370TLX-3006/NOPB
MICRO SMD201260RoHSDownloadN/A
XYTT
I SPUB
LM3370TLX-3008/NOPB
MICRO SMD201260RoHSDownloadN/A
XYTT
I SPTB
LM3370TLX-3022/NOPB
MICRO SMD201260RoHSDownloadN/A
XYTT
I STHB
LM3370TLX-3206/NOPB
MICRO SMD201260RoHSDownloadN/A
XYTT
I SPXB
LM3370TLX-3607/NOPB
MICRO SMD201260RoHSDownloadN/A
XYTT
I SPSB
LM3370TLX-3806/NOPB
MICRO SMD201260RoHSDownloadN/A
XYTT
I SPVB

Reliability Metrics
Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM3370SD-3013CMOS70184060010890004309006723
LM3370SD-3021CMOS70184060010890004309006723
LM3370SD-3416CMOS70184060010890004309006723
LM3370SD-3621CMOS70184060010890004309006723
LM3370SD-3806CMOS70184060010890004309006723
LM3370SD-4221CMOS70184060010890004309006723
LM3370SDX-3013CMOS70184060010890004309006723
LM3370SDX-3021CMOS70184060010890004309006723
LM3370SDX-3416CMOS70184060010890004309006723
LM3370SDX-3621CMOS70184060010890004309006723
LM3370SDX-3806CMOS70184060010890004309006723
LM3370SDX-4221CMOS70184060010890004309006723
LM3370TL-3006CMOS70184060010890004309006723
LM3370TL-3008CMOS70184060010890004309006723
LM3370TL-3022CMOS70184060010890004309006723
LM3370TL-3206CMOS70184060010890004309006723
LM3370TL-3607CMOS70184060010890004309006723
LM3370TL-3806CMOS70184060010890004309006723
LM3370TLX-3006CMOS70184060010890004309006723
LM3370TLX-3008CMOS70184060010890004309006723
LM3370TLX-3022CMOS70184060010890004309006723
LM3370TLX-3206CMOS70184060010890004309006723
LM3370TLX-3607CMOS70184060010890004309006723
LM3370TLX-3806CMOS70184060010890004309006723

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.


[Information as of 21-Nov-2009]