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LT1431MJ8 Datasheet(PDF) 5 Page - Linear Technology |
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LT1431MJ8 Datasheet(HTML) 5 Page - Linear Technology |
5 / 12 page 5 LT1431 PI FU CTIO S COLL (Pin 1): Open collector of the output transistor. The maximum pin voltage is 26V. The saturation voltage at 100mA is approximately 1V. COMP (Pin 2): Base of the driver for the output transistor. This pin allows additional compensation for complex feedback systems and shutdown of the regulator. It must be left open if unused. V + (Pin 3): Bias voltage for the entire shunt regulator. The maximum input voltage is 36V and the minimum to operate is equal to VREF (2.5V). The quiescent current is typically 0.6mA. RTOP (Pin 4): Top of the on-chip 5k-5k resistive divider that guarantees 1% accuracy of operation as a 5V shunt regulator with no external trim. The pin is tied to COLL for self-contained 5V operation. It may be left open if unused. See note on parasitic diodes below. GND-S (Pin 5): Ground reference for the on-chip resistive divider and shunt regulator circuitry except for the output transistor. This pin allows external current limit of the output transistor with one resistor between GND-F (force) and GND-S (sense). GND-F (Pin 6): Emitter of the output transistor and sub- strate connection for the die. RMID (Pin 7): Middle of the on-chip resistive divider string between RTOP and GND-S. The pin is tied to REF for self- contained 5V operation. It may be left open if unused. REF (Pin 8): Control pin of the shunt regulator with a 2.5V threshold. If V + > 3V, input bias current cancellation reduces IB to 0.2µA typical. COMP, RTOP, RMID, and REF have static discharge protec- tion circuits that must not be activated on a continuous basis. Therefore, the absolute maximum DC voltage on these pins is 6V, well beyond the normal operating condi- tions. As with all bipolar ICs, the LT1431 contains parasitic diodes which must not be forward biased or else anoma- lous behavior will result. Pin conditions to be avoided are RTOP below RMID in voltage and any pin below GND-F in voltage (except for GND-S). The following pin definitions apply to the Z package. CATHODE (Pin 1): Corresponds to COLL and V + tied together. ANODE (Pin 2): Corresponds to GND-S and GND-F tied together. REF (Pin 3): Corresponds to REF. I DAGRA BLOCK LT1431 • BD01 COMP V + GND-FORCE GND-SENSE RTOP REF RMID 2.5V + – gm = 4mA/V 5k COLLECTOR 8 7 5 43 2 1 6 5k |
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