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Features
| | Space saving 3 x 3 mm LLP-10 & eMSOP-10 package |
| | Wide input voltage range 3V to 20V |
| | Wide input voltage range 1V to 18V |
| | LM27341 delivers 1.5A maximum output current |
| | LM27342 delivers 2A maximum output current |
| | High switching frequency 2 MHz |
| | Frequency synchronization 1.00 MHz < fSW < 2.35 MHz
|
| | 150 mΩ NMOS switch with internal bootstrap supply |
| | 70 nA shutdown current |
| | Internal voltage reference accuracy of 1% |
| | Peak Current-Mode, PWM operation |
| | Thermal shutdown |
| | LM27341Q and LM27342Q are AEC-Q100 Grade 1 qualified and are manufactured on an Automotive Grade Flow |
Description The LM27341 and LM27342 regulators are monolithic, high frequency, PWM step-down DC-DC converters in 10-pin LLP and 10-pin
eMSOP packages. They contain all the active functions to provide local DC-DC conversion with fast transient response and accurate
regulation in the smallest possible PCB area.
With a minimum of external components the LM27341 and LM27342 are easy to use. The ability to drive 1.5A or 2A loads respectively,
with an internal 150 mΩ NMOS switch results in the best power density available. The world-class control circuitry allows
for on-times as low as 65 ns, thus supporting exceptionally high frequency conversion. Switching frequency is internally set
to 2 MHz and synchronizable from 1 to 2.35 MHz, which allows the use of extremely small surface mount inductors and chip
capacitors. Even though the operating frequency is very high, efficiencies up to 90% are easy to achieve. External shutdown
is included featuring an ultra-low shutdown current of 70 nA. The LM27341and LM27342 utilize peak current-mode control and
internal compensation to provide high-performance regulation over a wide range of operating conditions. Additional features
include internal soft-start circuitry to reduce inrush current, pulse-by-pulse current limit, thermal shutdown, and output
over-voltage protection.
Applications
| | Local 12V to Vcore Step-Down Converters |
| | Radio Power Supply |
| | Core Power in HDDs |
| | Set-Top Boxes |
| | Automotive |
| | USB Powered Devices |
| | DSL Modems |
|
Typical Application
|
| Paramaters / Values | LM27342 | LM27341 | LM2738 |
| Output Current | 2000 mA
| 1500 mA
| 1500 mA
|
| Input Min Voltage | 3 Volt
| 3 Volt
| 3 Volt
|
| Input Max Voltage | 20 Volt
| 20 Volt
| 20 Volt
|
| Output Min | 1 Volt
| 1 Volt
| 0.8 Volt
|
| Output Max | 18 Volt
| 18 Volt
| 18 Volt
|
| Frequency Min | 1000 kHz
| 1000 kHz
| 364, 1280 kHz
|
| Frequency Max | 2350 kHz
| 2350 kHz
| 1920, 676 kHz
|
| Efficiency (peak) | 93 %
| 93 %
| 94.5, 92 %
|
| On/Off Pin | Yes
| Yes
| Yes
|
| Error Flag | No
| No
| No
|
| SoftStart | Yes
| Yes
| Yes
|
| Sync Pin | Yes
| Yes
| No
|
| Inverting | No
| No
| No
|
| Flyback | No
| No
| No
|
| RegType | Switching Regulator
| Switching Regulator
| Switching Regulator
|
| Temperature Min | -40 deg C
| -40 deg C
| -40 deg C
|
| Temperature Max | 125 deg C
| 125 deg C
| 125 deg C
|
| Adjustable Output | Yes
| Yes
| Yes
|
| Adj Switch Frequency | Yes
| Yes
| No
|
| PWM Mode | Current
| Current
| Current
|
| Topology | Non-Synchronous Buck Regulator
| Non-Synchronous Buck Regulator
| Buck
|
| Special Features | OVP, internal compensation, 70nA shutdown current, pulse-by-pulse current limit
| OVP, internal compensation, 70nA shutdown current, pulse-by-pulse current limit
| |
| Step-Down | Yes
| Yes
| Yes
|
| Multiple Output Capability | No
| No
| No
|
| Output Range | 1.0 - 18V
| 1.0 - 18V
| |
| Switching Frequency | 2000 kHz
| 2000 kHz
| 1600, 550 kHz
|
| Feedback Voltage | 1 Volt
| 1 Volt
| 0.8 Volt
|
| AEC Q-100 Automotive Grade | 1
| 1
| |
| Automotive | Yes
| Yes
| |
| PowerWise | No
| No
| |
| Synchronous Rectification | No
| No
| No
|
| Quiescent Current | 2.4 mA
| 2.4 mA
| |
Datasheet
Featured Application Notes
More Application Notes
Part Number(s) (NSID) | Description | Availability | Current Reported Stock | Budgetary Pricing | Standard Pack Size |
LM27342MYEVAL
| LM27342MY (10-Pin eMSOP Package) - 2MHz 2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization | Full production
| | Distributor | Region | Qty |
| NATIONAL |  | Worldwide | 72 |
| $50.00 each | 1 |
| Description:
The LM27342 demonstration board is designed to provide the power supply design engineer with a fully functional regulator design which can be synchronized to an external clock between 1000 kHz and 2350 kHz. The evaluation board provides a 3.3V output with a 2A current capability. The wide input voltage ranges from 5V to 20V. Without an external synchronization signal, the design operates at 2000 kHz reducing the solution size and keeping switching noise out of the AM radio band. The printed circuit board consists of 4 layers of copper on FR4 material. There is a ground plane on the internal layer directly beneath the LM27342.and a ground plane on the bottom layer. The LM27342 is thermally tied to the ground planes by thermal vias directly underneath the device. The second internal layer is tied half to VIN and half to VOUT.
Features:
- Input Range: 5 to 20V
- Output Voltage: 3.3V
- Output Current: 0 to 2A
- Frequency of Operation: 1000 kHz - 2350 kHz
- Board Size: 1.1 X 1.3 inches
Contents:
|
Part Number(s) (NSID) | Description | Availability | Current Reported Stock | Budgetary Pricing | Standard Pack Size |
LM27342SDEVAL
| LM27342 (10-Pin LLP Package) - 2MHz 2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization | Full production
| | Distributor | Region | Qty |
| NATIONAL |  | Worldwide | 93 |
| $50.00 each | 1 |
| General Description:
The LM27342 demonstration board is designed to provide the power supply design engineer with a fully functional regulator design which can be synchronized to an external clock between 1000 kHz and 2350 kHz. The evaluation board provides a 3.3V output with a 2A current capability. The wide input voltage ranges from 5V to 20V. Without an external synchronization signal, the design operates at 2000 kHz reducing the solution size and keeping switching noise out of the AM radio band. The printed circuit board consists of 4 layers of copper on FR4 material. There is a ground plane on the internal layer directly beneath the LM27342.and a ground plane on the bottom layer. The LM27342 is thermally tied to the ground planes by thermal vias directly underneath the device. The second internal layer is tied half to VIN and half to VOUT.
Features:
- Input Range: 5 to 20V
- Output Voltage: 3.3V
- Output Current: 0 to 2A
- Frequency of Operation: 1000 kHz - 2350 kHz
- Board Size: 1.1 X 1.3 inches
Contents:
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| Power for Space-Constrained Applications |
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| Power for Space-Constrained Applications |
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| What's New in Power -- January 2009 |
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| |  |
| Power for Space-Constrained Applications Date: 4/22/2009 Length: 0:03:35 |
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| Power for Space-Constrained Applications Date: 4/22/2009 Length: 00:45:00 |
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| What's New in Power -- January 2009 Date: 01/19/09 Length: 0:4:57 |
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