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Features: ·2MHz (typ.) PWM Switching Frequency· Operates from a single Li-Ion cell (2.7V to 5.5V)· Adjustable Output Voltage (0.8V to 3.6V) DC-DC· High-efficiency synchronous buck converter· 300mA Maximum load capability (PWM mode)· 500mA Maximum load capability (Bypass mode)· PWM, Forced and Auto...

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SeekIC No. : 004395240 Detail

LM3280: Features: ·2MHz (typ.) PWM Switching Frequency· Operates from a single Li-Ion cell (2.7V to 5.5V)· Adjustable Output Voltage (0.8V to 3.6V) DC-DC· High-efficiency synchronous buck converter· 300mA M...

LM3280 Data Sheet

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Part Number:: LM3280
Supply Ability:: 5000

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Features: Preset output voltage error is less than ±5% overload, line and temperatureSpecified at ...

Product Details

Description

Features:

·2MHz (typ.) PWM Switching Frequency
· Operates from a single Li-Ion cell (2.7V to 5.5V)
· Adjustable Output Voltage (0.8V to 3.6V) DC-DC
· High-efficiency synchronous buck converter
· 300mA Maximum load capability (PWM mode)
· 500mA Maximum load capability (Bypass mode)
· PWM, Forced and Automatic Bypass Mode
· 3 Low-dropout and fast transient response LDOs
· 16-pin micro SMD Package
· Current Overload Protection
· Thermal Overload Protection

Application

· Cellular Phones
· Hand-Held Radios
· Battery Powered RF Devices

Specifications

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.
SVIN, PVIN to SGND............... −0.2V to +6.0V
PGND to SGND.................. −0.2V to +0.2V
E_Ns, FB, BYP, V_CON................ (SGND −0.2V)
                                                                          to (SVIN +0.2V)
                                                                                  w/6.0V max
SW, BYPOUT.................... (PGND −0.2V)
                                                                              to (PVIN +0.2V)
                                                                                    w/6.0V max
PVIN to SVIN................... −0.2V to +0.2V
Continuous Power Dissipation (Note 3) ....Internally Limited
Junction Temperature (T_J-MAX) .............+150°C
Storage Temperature Range ........−65°C to +150°C

Description

The LM3280 is a multi-functional Power Management Unit, optimized for low-power handheld applications such as Cellular Phones.

The LM3280 incorporates three low-dropout LDO voltage regulators and one step down PWM DC-DC converter with an internal Bypass FET. The step down converter's output voltage can be set using an analog input (V_CON) for optimizing efficiency of the RF PA at various power levels. The LDO operates a nominal output voltage of 2.85V and maximum load current capability of 20mA for a reference voltage required by linear RF power amplifiers. The LM3280 additionally features a separate enable pin for each output.

The LM3280 is available in a 16-pin lead free micro SMD package.

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LM3280

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