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Design Note
Reliability Data
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Features
- Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT
- 2.7V to 10V Input and Output Range
- Up to 96% Efficiency
- Up to 10A of Output Current
- All N-channel MOSFETs, No RSENSE™
- True Output Disconnect During Shutdown
- Programmable Current Limit and Soft-Start
- Optional Short-Circuit Shutdown Timer
- Output Overvoltage and Undervoltage Protection
- Programmable Frequency: 100kHz to 1MHz
- Selectable Burst Mode® Operation
- Available in 24-Lead (4mm × 4mm) Exposed Pad QFN Package
Typical Application
Description
The LTC3785 is a high power synchronous buck-boost controller that drives all N-channel power MOSFETs from input voltages above, below and equal to the output voltage. With an input range of 2.7V to 10V, the LTC3785 is well suited for a wide variety of single or dual cell Li-Ion or multicell alkaline/NiMH applications.
The operating frequency can be programmed from 100kHz to 1MHz. The soft-start time and current limit are also programmable. The soft-start capacitor doubles as the fault timer which can program the IC to latch off or recycle after a determined off time. Burst Mode operation is user controlled and can be enabled by driving the MODE pin high.
Protection features include foldback current limit, shortcircuit and overvoltage protection.
| Power Good |
|
| LTC3785 | No |
| LTC3785-1 | Yes |
4x4 QFN-24
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC3785EUF#PBF | QFN | 24 | E | $5.09 | $3.56 |
| LTC3785EUF#TRPBF | QFN | 24 | E | $3.62 | |
| LTC3785EUF-1#PBF | QFN | 24 | E | $5.36 | $3.75 |
| LTC3785EUF-1#TRPBF | QFN | 24 | E | $3.81 | |
| LTC3785IUF#PBF | QFN | 24 | I | $5.54 | $3.88 |
| LTC3785IUF#TRPBF | QFN | 24 | I | $3.94 |
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC957A | LTC3785EUF Demo Board | No Rsense, 2.7V ≤ VIN ≤ 10V, Vout = 3.3V @ 3A | $150.00 |