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TPS60122PWP 데이터시트(PDF) 4 Page - Texas Instruments |
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TPS60122PWP 데이터시트(HTML) 4 Page - Texas Instruments |
4 / 27 page TPS60120, TPS60121, TPS60122, TPS60123, TPS60124, TPS60125 REGULATED 200-mA HIGH EFFICIENCY CHARGE PUMP DC/DC CONVERTERS SLVS257B – NOVEMBER 1999 – REVISED AUGUST 2000 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Terminal Functions TERMINAL I/O DESCRIPTION NAME NO. I/O DESCRIPTION C1+ 6 Positive terminal of the flying capacitor C1 C1– 8 Negative terminal of the flying capacitor C1 C2+ 15 Positive terminal of the flying capacitor C2 C2– 13 Negative terminal of the flying capacitor C2 ENABLE 3 I ENABLE input. Connect ENABLE to IN for normal operation. When ENABLE is a logic low, the device turns off and the supply current decreases to 0.05 µA. The output is disconnected from the input when the device is placed in shutdown. FB 4 I Feedback input. Connect FB to OUT as close to the load as possible to achieve best regulation. Resistive divider is on the chip to match the internal reference voltage of 1.21 V. GND 1, 2, 19, 20 Ground. Analog ground for internal reference and control circuitry. Connect to PGND through a short trace. IN 7,14 I Supply input. Connect to an input supply in the 1.8-V to 3.6-V range. Bypass IN to PGND with a (CO/2) µF capacitor. Connect both INs through a short trace. LBO/PG 17 O Low battery detector output or power good output. Open drain output of the low battery or power-good comparator. It can sink 1 mA. A 100-k Ω to 1-MΩ pullup is recommended. Leave terminal unconnected if not used. LBI/NC 18 I Low battery detector input (TPS60120/TPS60122/TPS60124 only). The input is compared to the internal 1.21-V reference voltage. Connect terminal to ground if the low-battery detector function is not used. On the TPS60121, TPS60123, and TPS60125, this terminal is not connected. OUT 5, 16 O Regulated power output. Connect both OUT terminals through a short trace and bypass OUT to GND with the output filter capacitor CO. PGND 9–12 Power ground. Charge-pump current flows through this pin. Connect all PGND pins together. detailed description operating principle The TPS6012x charge pumps provide a regulated 3.3-V or 3-V output from a 1.8-V to 3.6-V input. They are designed for a maximum load current of at least 200 mA or 100 mA, respectively. Designed specifically for space-critical, battery-powered applications, the complete charge pump circuit requires only four external capacitors. The circuit is optimized for efficiency over a wide input voltage range. The TPS6012x charge pumps consist of an oscillator, a 1.21-V bandgap reference, an internal resistive feedback circuit, an error amplifier, high current MOSFET switches, a shutdown/start-up circuit, a low-battery or power-good comparator, and a control circuit (see the functional block diagram). The device consists of two single-ended charge pumps. The power stages of the charge pump are automatically configured to amplify the input voltage with a conversion factor of 1.5 or 2. The conversion ratio depends on input voltage and output current. With input voltages lower than approximately 2.4 V, the convertor will run in a voltage doubler mode with a gain of two. With a higher input voltage, the converter operates with a gain of 1.5. This assures high efficiency over the wide input voltage range of a two-cell battery stack and is further described in the adaptive mode switching section. adaptive mode switching The ON-resistance of the MOSFETs that are in the charge path of the flying capacitors is regulated when the charge pump operates in voltage doubler-mode. It is changed depending on the output voltage that is fed back into the control loop. This way, the time-constant during the charging phase can be modified and increased versus a time-constant for fully switched-on MOSFETs. The ON-resistance of both switches and the capacitance of the flying capacitor define the time constant. The MOSFET switches in the discharge path of the charge pump are always fully switched on to their minimum rDS(on). With the time-constant during charge phase being larger than the time constant in discharge phase, the voltage on the flying capacitors stabilizes to the lowest possible value necessary to get a stable VO. |
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