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ML1565QFNG Datasheet(PDF) 6 Page - Minilogic Device Corporation Limited |
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ML1565QFNG Datasheet(HTML) 6 Page - Minilogic Device Corporation Limited |
6 / 21 page P6/21 Rev. C, Sep 2005 ML1565 Step-Up DC-DC Converter Parameter Condition Min Typ. Max Unit Step-Up Startup-to-Normal Operating Threshold Rising or falling edge (Note 4) 2.30 2.60 V Step-Up Voltage Adjust Range 2.7 5.5 V FBSU Regulation Voltage 1.225 1.275 V OUTSU Regulation Voltage FBSELSU = GND 3.283 3.417 V FBSU to COMPSU Transconductance FBSU = COMPSU 80 185 µS FBSU Input Leakage Current FBSU = 1.25V -100 +100 nA Burst Mode Trip Level (Note 6) 150 275 mA Step-Up Maximum Duty Cycle FBSU = 1V 80 90 % OUTSU Leakage Current VLX = 0V, OUTSU = 5.5V 20 µA LXSU Leakage Current VLXSU = VOUT = 5.5V 20 µA N-channel 150 Switch On-Resistance P-channel 250 mΩ N-Channel Current limit 1.6 2.4 A Auxiliary DC-DC Controllers (Aux 1, 2, and 3) Parameter Condition Min Typ. Max Unit Maximum Duty Cycle FB_ = 1V 80 90 % FB_ Regulation Voltage FB_ = COMP_ 1.225 1.275 V FB_ to COMP_ Transconductance FB_ = COMP_ 80 185 µS FB_ Input Leakage Current FB_ = 1.25V -100 +100 nA AUX1 Output Regulation Voltage FBSEL1 = GND. FB1 connected directly to AUX1 output 4.90 5.10 V Output high 10 DL_ Driver Resistance Output low 5 Ω Logic Inputs (ON_, FBSEL) Parameter Condition Min Typ. Max Unit 1.1V < OUTSU < 1.8V (ONSU only) 0.2 Input Low Level 1.8V < OUTSU < 5.5V 0.4 V 1.1V < OUTSU < 1.8V (ONSU only) VOUTSU -0.2 Input High Level 1.8V < OUTSU < 5.5V 1.6 V FBSEL = 3.6V, OUTSU = 3.6V -100 +100 FBSEL_ Input Leakage Current FBSEL = GND, OUTSU = 3.6V -100 +100 nA Note 2: The IC is powered from the OUTSU output. Note 3: Since the part is powered from OUTSU, a Schottky rectifier, connected from the input battery to OUTSU, is required for low-voltage startup. Note 4: The step-up regulator operates in startup mode until this voltage is reached. Do not apply full load current during startup. Note 5: The step-up current limit in startup refers to the LXSU switch current limit, not an output current limit. Note 6: The burst mode current threshold is the transition point between fixed-frequency PWM operation and burst mode operation (where switching rate varies with load). The spec is given in terms of inductor current. In terms of output current, the burst mode transition varies with input/output voltage ratio and inductor value. For step-up, the transition output current is approximately 1/3 the inductor current when stepping from 2V to 3.3V. For step-down, the transition current in terms of output current is approximately 3/4 the inductor current when stepping down from 3.3V to 1.8V. |
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