DocumentationDatasheet
Reliability Data
cad_symbol
Features
- Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 14V
- Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
- OPTI-LOOP® Compensation Minimizes COUT
- ±1.5% Output Voltage Accuracy
- Power Good Output Voltage Monitor
- Phase-Lockable Fixed Frequency 250kHz to 550kHz
- Dual N-Channel MOSFET Synchronous Drive
- Wide VIN Range: 4V to 32V Operation
- Very Low Dropout Operation: 99% Duty Cycle
- Adjustable Soft-Start Current Ramping
- Foldback Output Current Limiting
- Output Overvoltage Protection
- Low Shutdown IQ: 20µA
- Selectable Constant-Frequency or Burst Mode® Operation
- Small 28-Lead SSOP and 5mm × 5mm QFN Packages
Typical Application
Description
The LTC3727LX-1 is a high performance dual step-down switching regulator controller that drives all N-channel synchronous power MOSFET stages. A constant-frequency current mode architecture allows phase-lockable frequency of up to 550kHz. Power loss and noise due to the ESR of the input capacitors are minimized by operating the two controller output stages out of phase.
OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. There is a precision 0.8V reference and a power good output indicator. A wide 4V to 28V (32V maximum) input supply range encompasses all battery chemistries.
| Vin Range |
Vref Accuracy Over Temp |
Latch-Off | Min On-Time | |
| LTC3727 | 4V - 36V | ±1% | No | 180ns |
| LTC3727-1 | 4V - 36V | ±1% | Yes | 180ns |
| LTC3727A-1 | 4V - 36V | ±1% | No | 120ns |
| LTC3727LX-1 | 4V - 32V | ±1.5% | No | 120ns |
5x5 QFN-32,SSOP-28
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC3727AEG-1#PBF | SSOP | 28 | E | $6.93 | $4.85 |
| LTC3727AEG-1#TRPBF | SSOP | 28 | E | $4.91 | |
| LTC3727AIG-1#PBF | SSOP | 28 | I | $8.43 | $5.90 |
| LTC3727AIG-1#TRPBF | SSOP | 28 | I | $5.96 | |
| LTC3727EG#PBF | SSOP | 28 | E | $6.93 | $4.85 |
| LTC3727EG#TRPBF | SSOP | 28 | E | $4.95 | |
| LTC3727EG-1#PBF | SSOP | 28 | E | $6.93 | $4.85 |
| LTC3727EG-1#TRPBF | SSOP | 28 | E | $4.95 | |
| LTC3727EUH-1#PBF | QFN | 32 | E | $7.21 | $5.05 |
| LTC3727EUH-1#TRPBF | QFN | 32 | E | $5.15 | |
| LTC3727IG-1#PBF | SSOP | 28 | I | $8.43 | $5.90 |
| LTC3727IG-1#TRPBF | SSOP | 28 | I | $5.96 | |
| LTC3727LXEG-1#PBF | SSOP | 28 | E | $6.21 | $4.35 |
| LTC3727LXEG-1#TRPBF | SSOP | 28 | E | $4.45 | |
| LTC3727LXEUH-1#PBF | QFN | 32 | E | $6.57 | $4.60 |
| LTC3727LXEUH-1#TRPBF | QFN | 32 | E | $4.70 | |
| LTC3727EG | SSOP | 28 | E | $13.86 | $9.70 |
| LTC3727EG#TR | SSOP | 28 | E | $9.90 | |
| LTC3727EG-1 | SSOP | 28 | E | $13.86 | $9.70 |
| LTC3727EG-1#TR | SSOP | 28 | E | $9.90 | |
| LTC3727EUH-1 | QFN | 32 | E | $14.42 | $10.10 |
| LTC3727EUH-1#TR | QFN | 32 | E | $10.30 | |
| LTC3727AEG-1 | SSOP | 28 | E | $13.86 | $9.70 |
| LTC3727AEG-1#TR | SSOP | 28 | E | $9.82 | |
| LTC3727LXEG-1 | SSOP | 28 | E | $12.42 | $8.70 |
| LTC3727LXEG-1#TR | SSOP | 28 | E | $8.90 | |
| LTC3727LXEUH-1 | QFN | 32 | E | $13.14 | $9.20 |
| LTC3727LXEUH-1#TR | QFN | 32 | E | $9.40 |
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.