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TPS60133PWP Datasheet(PDF) 4 Page - Texas Instruments |
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TPS60133PWP Datasheet(HTML) 4 Page - Texas Instruments |
4 / 23 page TPS60130, TPS60131, TPS60132, TPS60133 REGULATED 5-V, 300 mA HIGH EFFICIENCY CHARGE PUMP DC/DC CONVERTERS SLVS258A – NOVEMBER 1999 – REVISED DECEMBER 1999 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 disabled. FB 4 I Feedback input. Connect FB to OUT as close to the load as possible to achieve best regulation. A resistive divider is on the chip to match internal reference voltage of 1.21 V. GND 1, 2, 19, 20 Ground. Analog ground for internal reference and control circuitry. Connect to PGND terminals through a short trace. IN 7,14 I Supply input. Bypass IN to PGND with a capacitor that has half of the capacitance of the output capacitor. Connect both IN terminals together through a short trace. LBO/PG 17 O Low battery detector output (TPS60130 and TPS60132) or power good output (TPS60131 and TPS60133). Open drain output of the low battery or power good comparator. It can sink 1 mA. A 100-k Ω to 1-MΩ pullup resistor to OUT is recommended. Leave the terminal unconnected if the low battery or power good detector is not used. LBI/NC 18 I Low battery detector input (TPS60130 and TPS60132 only). The voltage at this input is compared to the internal 1.21 V reference voltage. Connect this terminal to ground if the low-battery detection function is not used. On the TPS60131 and TPS60133, this terminal is not connected. OUT 5, 16 O Regulated 5-V 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 terminals together. detailed description operating principle The TPS6013x charge pumps provide a regulated 5-V output from a 2.7-V to 5.4-V input. They deliver a maximum load current of 300 mA or 150 mA, respectively. Designed specifically for space-critical, battery- powered applications, the complete charge pump circuit requires four external capacitors. The circuit is optimized for efficiency over a wide input voltage range. The TPS6013x 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/startup circuit, a low-battery or power-good comparator, and a control circuit (see functional block diagrams). The device consists of two single-ended charge pumps. These charge pumps are automatically configured to amplify the input voltage with a conversion factor of 1.5 or 2. The conversion ratio is dependent on the input voltage and load current. This assures high efficiency over a wide input voltage range and is further described in the adaptive mode switching section below. 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 bigger 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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