Product Descriptions
The LTC®3545/LTC3545-1 are triple, high efficiency, monolithic synchronous buck regulators using a constant frequency, current mode architecture. The regulators operate independently with separate run pins. The 2.25V to 5.5V input voltage range makes the LTC3545/LTC3545-1 well suited for single Li-Ion battery-powered applications. Low ripple pulse skip mode or high effi ciency Burst Mode operation is externally selectable. PWM pulse skip mode operation provides very low output ripple voltage while Burst Mode operation increases effi ciency at low output loads
Switching frequency is internally set to 2.25MHz, or the switching frequency can be synchronized to an external 1MHz to 3MHz clock. Power good indicators easily allow power on sequencing between the three regulators.
The internal synchronous switches increase effi ciency and eliminate external Schottky diodes. Low output voltages are supported with the 0.6V feedback reference voltage.
The LTC3545-1 replaces the SYNC/MODE function with a third PGOOD pin and forces Burst Mode operation.
Product Features
■ Three 800mA Outputs
■ High Effi ciency: Up to 95%
■ 2.25V to 5.5V Input Voltage Range
■ Low Ripple (<20mVP-P) Burst Mode® Operation IQ: 58μA
■ 2.25MHz Constant Frequency Operation or
■ Synchronizable to External 1MHz to 3MHz Clock
■ Power Good Indicators Ease Supply Sequencing
■ 0.6V Reference Allows Low Output Voltages
■ Current Mode Operation/Excellent Transient Response
■ Low Profi le 16-Lead 3mm × 3mm QFN Package
Product Applications
■ Smart Phones
■ Wireless and DSL Modems
■ Digital Still Cameras
■ Portable Instruments
■ Point of Load Regulation
Product Specification
| Attribute | Attribute value |
| ANSM-Part# | ANSM-LTC3545EUD#TRPBF |
| Category | Integrated Circuits (ICs) |
| Power Management (PMIC) | |
| Voltage Regulators - DC DC Switching Regulators | |
| Mfr | - |
| Packaging | Tape & Reel (TR) |
| Cut Tape (CT) | |
| Digi-Reel® | |
| Part Status | Active |
| Function | Step-Down |
| Output Configuration | Positive |
| Topology | Buck |
| Output Type | Adjustable |
| Number of Outputs | 3 |
| Voltage - Input (Min) | 2.25V |
| Voltage - Input (Max) | 5.5V |
| Voltage - Output (Min/Fixed) | 0.6V |
| Voltage - Output (Max) | 5.5V |
| Current - Output | 800mA |
| Frequency - Switching | 2.25MHz |
| Synchronous Rectifier | Yes |
| Operating Temperature | -40°C ~ 125°C (TJ) |
| Mounting Type | Surface Mount |
| Package / Case | 16-WFQFN Exposed Pad |
| Supplier Device Package | 16-QFN (3x3) |
| Base Product Number | LTC3545 |
Product Photos
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