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Features
| | VOUT = 0.75V to 3.3V
|
| | ±1% DC output voltage precision |
| | 2.3
≤ VIN
≤ 5.5V
|
| | 4 MHz switching frequency |
| | 64 μA (typ.) quiescent current in ECO mode |
| | 1A maximum load capability |
| | Automatic ECO/PWM mode switching |
| | Mode Pin to select ECO/Forced PWM mode |
| | 1 μH inductor, 4.7 μF input capacitor (0603(1608) case size) and 4.7 μF output capacitor (0603(1608) case size) |
| | Current overload and thermal shutdown protections |
| | Only three tiny surface-mount external components required (solution size less than 15 mm
2)
|
Description The LM3691 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Li-Ion cell or 3 cell
NiMH/NiCd batteries. It provides up to 1A load current, over an input voltage range from 2.3V to 5.5V. There are several different
fixed voltage output options available.
LM3691 has a mode-control pin that allows the user to select Forced PWM mode or ECO mode that changes modes between gated
PWM mode and PWM automatically depending on the load. In ECO, LM3691 offers superior efficiency and very low Iq under light load conditions. ECO mode extends the battery life through reduction of the quiescent current during light load
conditions and system standby.
The LM3691 is available in a 6–bump micro SMD package. Only three external surface-mount components, a 1 μH inductor, a 4.7
μF input capacitor and a 4.7 μF output capacitor, are required.
Applications
| | Mobile Phones |
| | Hand-Held Radios |
| | MP3 players |
| | Portable Hard Disk Drives |
|
revised typ application diagram
|
| |
| Parameters | Values |
| Output Current |
1000 mA |
| Input Min Voltage |
2.3 Volt |
| Input Max Voltage |
5.5 Volt |
| Output Min |
0.75 Volt |
| Output Max |
1.8 Volt |
| Frequency Min |
4000 kHz |
| Frequency Max |
4000 kHz |
| Efficiency (peak) |
95 % |
| On/Off Pin |
Yes |
| Error Flag |
No |
| SoftStart |
Yes |
| Sync Pin |
No |
| Inverting |
No |
| Flyback |
No |
| RegType |
Switching Regulator |
| Temperature Min |
-30 deg C |
| Temperature Max |
85 deg C |
| Adjustable Output |
No |
| Adj Switch Frequency |
No |
| PWM Mode |
Voltage |
| Topology |
Synchronous Buck |
| Special Features |
Pin-selectable PWM/ECO mode, Typ. Iq in shutdown is 0.03uA, 1% output accuracy, only 3external components |
| Step-Down |
Yes |
| Multiple Output Capability |
No |
| Output Range |
0.75V to 1.8V |
| Switching Frequency |
4000 kHz |
| Feedback Voltage |
Undefined Volt |
| Regulator Family |
Undefined |
| Automotive |
No |
| PowerWise |
Yes |
| Synchronous Rectification |
Yes |
|
Datasheet
Featured Application Notes
More Application Notes
Part Number(s) (NSID) | Top View | Availability | Current Reported Stock | Budgetary Pricing | Standard Pack Size |
LM3691TL-0.75/NOPB
RoHS | | Full production Lead Time: 6 weeks
 | | Distributor | Region | Qty |
| DIGIKEY |  | Worldwide | 496 |
| $2.00 each at 1K+ pcs | reel of 250 |
LM3691TL-1.2/NOPB
RoHS | | Full production Lead Time: 6 weeks
 |
| $2.00 each at 1K+ pcs | reel of 250 |
LM3691TL-1.5/NOPB
RoHS | | Full production Lead Time: 6 weeks
 |
| $2.00 each at 1K+ pcs | reel of 250 |
LM3691TL-1.8/NOPB
RoHS | | Full production Lead Time: 6 weeks
 |
| $2.00 each at 1K+ pcs | reel of 250 |
LM3691TL-2.5/NOPB
RoHS | | Full production Lead Time: 12 weeks
 | | Distributor | Region | Qty |
| DIGIKEY |  | Worldwide | 697 |
| $2.00 each at 1K+ pcs | reel of 250 |
LM3691TLX-0.75/NOPB
RoHS | | Full production Lead Time: 6 weeks
| | Distributor | Region | Qty |
| DIGIKEY |  | Worldwide | 0 |
| $2.00 each at 1K+ pcs | reel of 3000 |
LM3691TLX-1.2/NOPB
RoHS | | Full production Lead Time: 6 weeks
| | Distributor | Region | Qty |
| DIGIKEY |  | Worldwide | 0 |
| $2.00 each at 1K+ pcs | reel of 3000 |
LM3691TLX-1.5/NOPB
RoHS | | Full production Lead Time: 6 weeks
| | Distributor | Region | Qty |
| DIGIKEY |  | Worldwide | 0 |
| $2.00 each at 1K+ pcs | reel of 3000 |
LM3691TLX-1.8/NOPB
RoHS | | Full production Lead Time: 6 weeks
| | Distributor | Region | Qty |
| DIGIKEY |  | Worldwide | 0 |
| $2.00 each at 1K+ pcs | reel of 3000 |
LM3691TLX-2.5/NOPB
RoHS | | Full production Lead Time: 12 weeks
| | Distributor | Region | Qty |
| DIGIKEY |  | Worldwide | 0 |
| $2.00 each at 1K+ pcs | reel of 3000 |
Part Number(s) (NSID) | Description | Availability | Current Reported Stock | Budgetary Pricing | Standard Pack Size |
LM3691TL-1.2EV
| LM3691TL-1.2 Evaluation Board | Full production
|
| $92.00 each | 1 |
| Description:
The LM3691 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Li-Ion cell or 3 cell NiMH/NiCd batteries. It provides up to 1A load current, over an input voltage range from 2.3V to 5.5V. There are several different fixed voltage output options available.
The LM3691 evaluation board is a working demonstration of a step down DC-DC converter. This application note contains information about the evaluation board. For further information on buck converter topology, device electrical characteristics, and component selection, please refer to the datasheet.
Features:
- VOUT = 0.75V to 1.8V
- ± 1% DC output voltage precision
- 2.3 ≤ VIN ≤ 5.5V
- 4 MHz switching frequency
- 64 µ A (typ.) quiescent current in ECO mode
- 1A maximum load capability
- Automatic ECO/PWM mode switching
- Mode Pin to select ECO/Forced PWM mode
- 1 µ H inductor, 4.7 µ F input capacitor (0603(1608) case size) and 4.7 µ F output capacitor (0603(1608) case size)
- Current overload and thermal shutdown protections
- Only three tiny surface-mount external components required (solution size less than 15 mm2)
Applications:
- Mobile Phones
- Hand-Held Radios
- MP3 players
- Portable Hard Disk Drives
|
Part Number(s) (NSID) | Description | Availability | Current Reported Stock | Budgetary Pricing | Standard Pack Size |
LM3691TL-1.8EV
| LM3691TL-1.8 Evaluation Board | Full production
|
| $92.00 each | 1 |
| Description:
The LM3691 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Li-Ion cell or 3 cell NiMH/NiCd batteries. It provides up to 1A load current, over an input voltage range from 2.3V to 5.5V. There are several different fixed voltage output options available.
The LM3691 evaluation board is a working demonstration of a step down DC-DC converter. This application note contains information about the evaluation board. For further information on buck converter topology, device electrical characteristics, and component selection, please refer to the datasheet.
Features:
- VOUT = 0.75V to 1.8V
- ± 1% DC output voltage precision
- 2.3 ≤ VIN ≤ 5.5V
- 4 MHz switching frequency
- 64 µ A (typ.) quiescent current in ECO mode
- 1A maximum load capability
- Automatic ECO/PWM mode switching
- Mode Pin to select ECO/Forced PWM mode
- 1 µ H inductor, 4.7 µ F input capacitor (0603(1608) case size) and 4.7 µ F output capacitor (0603(1608) case size)
- Current overload and thermal shutdown protections
- Only three tiny surface-mount external components required (solution size less than 15 mm2)
Applications:
- Mobile Phones
- Hand-Held Radios
- MP3 players
- Portable Hard Disk Drives
|
|