DocumentationDatasheet
Design Note
Reliability Data
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Features
- Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 10V
- Low Operating IQ: 80µA
- OPTI-LOOP Compensation Minimizes COUT
- ±1% Output Voltage Accuracy
- Wide VIN Range: 4V to 36V Operation
- Phase-Lockable Fixed Frequency 140kHz to 650kHz
- Dual N-Channel MOSFET Synchronous Drive
- Very Low Dropout Operation: 99% Duty Cycle
- Adjustable Output Voltage Soft-Start or Tracking
- Output Current Foldback Limiting
- Output Overvoltage Protection
- Low Shutdown IQ: 10µA
- Selectable Continuous, Pulse-Skipping or Burst Mode Operation at Light Loads
- Small 16-Lead Narrow SSOP or 3mm × 5mm DFN Package
Typical Application
Description
The LTC3835-1 is a high performance step-down switching regulator controller that drives an all N-channel synchronous power MOSFET stage. A constant-frequency current mode architecture allows a phase-lockable frequency of up to 650kHz.
The 80µA no-load quiescent current extends operating life in battery powered systems. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3835-1 features a precision 0.8V reference and a power good output indicator. The 4V to 36V input supply range encompasses a wide range of battery chemistries.
The TRACK/SS pin ramps the output voltage during startup. Current foldback limits MOSFET heat dissipation during short-circuit conditions.
| CLKOUT/PHASMD | EXTVCC | PGOOD | Package | |
|---|---|---|---|---|
| LTC3835 | Yes | Yes | Yes | TSSOP-20, 4x5 QFN-20 |
| LTC3835-1 | No | No | No | GN-16, 3x5 DFN-16 |
5x3 DFN-16,SSOP-16
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC3835EDHC-1#PBF | DFN | 16 | E | $4.86 | $3.40 |
| LTC3835EDHC-1#TRPBF | DFN | 16 | E | $3.46 | |
| LTC3835EFE#PBF | TSSOP | 20 | E | $5.07 | $3.55 |
| LTC3835EFE#TRPBF | TSSOP | 20 | E | $3.61 | |
| LTC3835EGN-1#PBF | SSOP | 16 | E | $4.86 | $3.40 |
| LTC3835EGN-1#TRPBF | SSOP | 16 | E | $3.46 | |
| LTC3835EUFD#PBF | QFN | 20 | E | $5.07 | $3.55 |
| LTC3835EUFD#TRPBF | QFN | 20 | E | $3.61 | |
| LTC3835IDHC-1#PBF | DFN | 16 | I | $6.00 | $4.20 |
| LTC3835IDHC-1#TRPBF | DFN | 16 | I | $4.26 | |
| LTC3835IFE#PBF | TSSOP | 20 | I | $6.14 | $4.30 |
| LTC3835IFE#TRPBF | TSSOP | 20 | I | $4.36 | |
| LTC3835IGN-1#PBF | SSOP | 16 | I | $6.00 | $4.20 |
| LTC3835IGN-1#TRPBF | SSOP | 16 | I | $4.26 | |
| LTC3835IUFD#PBF | QFN | 20 | I | $6.14 | $4.30 |
| LTC3835IUFD#TRPBF | QFN | 20 | I | $4.35 | |
| LTC3835EFE | TSSOP | 20 | E | $10.14 | $7.10 |
| LTC3835EUFD | QFN | 20 | E | $10.14 | $7.10 |
| LTC3835EFE#TR | TSSOP | 20 | E | $7.22 | |
| LTC3835EUFD#TR | QFN | 20 | E | $7.22 | |
| LTC3835EDHC-1 | DFN | 16 | E | $9.72 | $6.80 |
| LTC3835EDHC-1#TR | DFN | 16 | E | $6.92 | |
| LTC3835EGN-1 | SSOP | 16 | E | $9.72 | $6.80 |
| LTC3835EGN-1#TR | SSOP | 16 | E | $6.92 |
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 |
|---|---|---|---|
| DC965A | LTC3835EGN-1 Demo Board | 4.5V ≤ VIN ≤ 36V, Vout = 3.3V @ 5A | $125.00 |