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) |
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. More...
Applications
| | Baseband Processors |
| | Application Processors (Video, Audio) |
| | I/O Power |
| | FPGA Power and CPLD |
| |
Typical Application
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| Parameters | Values |
| 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 |
Typical Performance
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| |
Additional Resources
Design Tools

Block Diagram
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|