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LT3433 Datasheet(PDF) 5 Page - Linear Technology |
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LT3433 Datasheet(HTML) 5 Page - Linear Technology |
5 / 16 page 5 LT3433 3433f PI FU CTIO S the switch transistor.This pin also supplies power to most of the IC’s internal circuitry if the VBIAS pin is not driven externally. This supply will be subject to high switching transient currents so this pin requires a high quality bypass capacitor that meets whatever application-specific input ripple current requirements exist. BURST_EN (Pin 5): Burst Mode Enable/Disable. When this pin is below 0.3V, Burst Mode operation is enabled. Pin input bias current < 1 µA when Burst Mode operation is enabled. If Burst Mode operation is not desired, pulling this pin above 2V will disable the burst function. When Burst Mode operation is disabled, typical pin input current = 35 µA. BURST_EN should not be pulled above 20V. This pin is typically shorted to SGND for Burst Mode function, or connected to either VBIAS or VOUT to disable Burst Mode operation. VC (Pin 6): Error Amplifier Output. The voltage on the VC pin corresponds to the maximum switch current per oscil- lator cycle. The error amplifier is typically configured as an integrator circuit by connecting an RC network from this pin to ground. This circuit typically creates the dominant pole for the converter regulation feedback loop. Specific in- tegrator characteristics can be configured to optimize tran- sient response. See Applications Information. SGND (Pins 1, 8, 9, 16): Low Noise Ground Reference. VBST (Pin 2): Boosted Switch Supply. This “boosted” sup- ply rail is referenced to the SW_H pin. Supply voltage is maintained by a bootstrap capacitor tied from the VBST pin to the SW_H pin. A 1 µF capacitor is generally adequate for most applications. The charge on the bootstrap capacitor is refreshed through a diode, typically connected from the converter output (VOUT), during the switch-off period. Minimum off-time operation assures that the boost capacitor is refreshed each switch cycle. The LT3433 supports operational VBST sup- ply voltages up to 75V (absolute maximum) as referenced to ground. SW_H (Pin 3): Boosted Switch Output. This is the current return for the boosted switch and corresponds to the emitter of the switch transistor. The boosted switch shorts the SW_H pin to the VIN supply when enabled. The drive cir- cuitry for this switch is boosted above the VIN supply through the VBST pin, allowing saturation of the switch for maximum efficiency. The “ON” resistance of the boosted switch is 0.8 Ω. VIN (Pin 4): Input Power Supply. This pin supplies power to the boosted switch and corresponds to the collector of TYPICAL PERFOR A CE CHARACTERISTICS VBST Supply Switch Drive Current vs Temperature (ISW = 500mA) Switch Resistance vs Temperature (ISW = 500mA) TEMPERATURE ( °C) –50 0.8 0.9 1.1 25 75 3433 G12 0.7 0.6 –25 0 50 100 125 0.5 0.4 1.0 RSWH RSWL TEMPERATURE ( °C) –50 –25 31 34 3433 G13 28 25 0 50 100 25 75 125 40 37 TEMPERATURE ( °C) –50 31 34 3433 G14 28 25 0 50 100 –25 25 75 125 40 37 VOUT Supply Switch Drive Current vs Temperature (ISW = 500mA) |
Similar Part No. - LT3433_15 |
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Similar Description - LT3433_15 |
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