CL05B391KBNC Datasheet The charge pump is a doubler configuration that uses one external flying capacitor. When enabled, a 2-phase nonove rlapping clock controls the charge pump switches. At start-up, the LDO is disabled and the load is removed from CPO.When CPO reachesl.75VIN the LDO is enabled. If CPO falls below l.45VIN the LDO will be disabled. Gen- erally, the charge pump runs open loop with continuous clocking for low noise. If CPO is greater than l.95VIN and IOUT is less than 200 the charge pump will operate in Burst Mode operation for increased efficiency but slightly higher output noise. In Burst Mode operation, the clock is disabled when CPO reaches l.95VIN and enabled when CPO droops by about 150mV. The switching frequency is precisely controlled to ensure that the frequency is above 455kHz and at the optimum rate to ensure maximum effi- ciency. The switch edge rates are also controlled to mini- mize noise. The effective output resistance at CPO iS dependent on the voltage at VIN, CPO, the flying capacitor value CFLY and the junction temperature. A low ESR ca- pacitorof>2aF should be used at CPO for minimum noise. CL05B391KBNC on stock| ltem | Symbol | Condition | Min | Typ. | Max. | Unit | | Cperating voltage | VDD | | 27 | 50 | 55 | v | | Cperating temperature | TCPR | -30 | | +70 | C | | | | | | | |
| PIN | DESCRIPTION | | 1 2 3 tab | gate collector emitter collector | | |
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit | | Collector cutoff current | ICBO | VCB = -120 V,IE = 0 | | | -50 | yA | | Emitter cutoff current | IEBO | VEB = -3 V,IC = 0 | | | -50 | yA | | Forward current transfer ratio | hFEl | VCE = -5 V,IC = -20 mA | 20 | | | | | hFE2+ | VCE = -5 V,IC = - 1 A | 60 | | 200 | | | hFE3 | VCE = -5 V,IC = -4 A | 20 | | | | | Base to emitter voltage | VBE | VCE = -5 V,IC = -4 A | | | -1.8 | V | | Collector to emitter saturation voltage | VCE(sat) | Ic = -4 A, IB = - 0.4 A | | | -2.0 | V | | Transition frequency | fT | VCE = -5 V,IC = - 0.5 A, f = 1 MHz | | 15 | | MHz | | Collector output capacitance | Cob | VCB = -10 V,IE = 0, f = 1 MHz | | 150 | | pF | | | | | | | |
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