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The TPS6510x series offers a compact and small power supply solution that provides all three voltages required by thin film transistor (TFT) LCD displays. The auxiliary linear regulator controller can be used to generate a 3.3-V logic power rail for systems powered by a 5-V supply rail only.
The main output VO1, is a 1.6-MHz, fixed-frequency PWM boost converter providing the source drive voltage for the LCD display. The device is available in two versions with different internal switch current limits to allow the use of a smaller external inductor when lower output power is required. The TPS65100/01 has a typical switch current limit of 2.3 A, and the TPS65105 has a typical switch current limit of 1.37 A. A fully integrated adjustable charge pump doubler/tripler provides the positive LCD gate drive voltage. An externally adjustable negative charge pump provides the negative gate drive voltage. Due to the high 1.6-MHz switching frequency of the charge pumps, inexpensive and small 220-nF capacitors can be used.
The TPS6510x series has an integrated VCOM buffer to power the LCD backplane. For LCD panels powered by 5 V only, the TPS6510x series has a linear regulator controller using an external transistor to provide a regulated 3.3-V output for the digital circuits. For maximum safety, the TPS65100/05 goes into shutdown as soon as one of the outputs is out of regulation. The device can be enabled again by toggling the input or the enable (EN) pin to GND. The TPS65101 does not enter shutdown when one of the outputs is below its power good threshold.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
TPS6510x | HTSSOP (24) | 7.80 mm × 4.40 mm |
VQFN (24) | 4.00 mm × 4.00 mm |
Changes from C Revision (April 2006) to D Revision
LINEAR REGULATOR OUTPUT VOLTAGE | MINIMUM SWITCH CURRENT LIMIT | PACKAGE MARKING |
---|---|---|
3.3 V | 1.6 A | TPS65100 |
3.3 V | 1.6 A | TPS65101 |
3.3 V | 0.96 A | TPS65105 |
PIN | I/O | DESCRIPTION | ||
---|---|---|---|---|
NAME | HTSSOP | VQFN | ||
BASE | 3 | 6 | O | Base drive output for the external transistor. If Linear Regulator is not needed pull this pin against VIN. |
C1+ | 16 | 19 | — | Positive terminal of the charge pump flying capacitor |
C1- | 17 | 20 | — | Negative terminal of the charge pump flying capacitor |
C2+ | 14 | 17 | — | Positive terminal for the charge pump flying capacitor. If the device runs in voltage doubler mode, this pin should be left open. |
C2-/MODE | 15 | 18 | — | Negative terminal of the charge pump flying capacitor and charge pump MODE pin. If the flying capacitor is connected to this pin, the converter operates in a voltage tripler mode. If the charge pump needs to operate in a voltage doubler mode, the flying capacitor is removed and the C2-/MODE pin should be connected to GND. |
COMP | 22 | 1 | — | Compensation pin for the main boost converter. A small capacitor is connected to this pin. |
DRV | 18 | 21 | O | External charge pump driver |
EN | 24 | 3 | I | Enable pin of the device. This pin should be terminated and not be left floating. A logic high enables the device and a logic low shuts down the device. |
ENR | 23 | 2 | I | Enable pin of the linear regulator controller. This pin should be terminated and not be left floating. Logic high enables the regulator and a logic low puts the regulator in shutdown. |
FB1 | 1 | 4 | I | Feedback pin of the boost converter |
FB2 | 21 | 24 | I | Feedback pin of negative charge pump |
FB3 | 12 | 15 | I | Feedback pin of positive charge pump |
FB4 | 2 | 5 | I | Feedback pin of the linear regulator controller. The linear regulator controller is set to a fixed output voltage of 3.3 V or 3 V depending on the version. |
GND | 19 | 22 | — | Ground |
OUT3 | 13 | 16 | O | Positive charge pump output |
PGND | 7, 8 | 10, 11 | — | Power ground |
REF | 20 | 23 | O | Internal reference output typically 1.23 V |
SUP | 9 | 12 | I | Supply pin of the positive, negative charge pump, boost converter gate drive circuit, and VCOM buffer. This pin should be connected to the output of the main boost converter and cannot be connected to any other voltage source. For performance reasons, it is not recommended for a bypass capacitor to be connected directly to this pin. |
SW | 5, 6 | 8, 9 | — | Switch pin of the boost converter |
VCOM | 10 | 13 | O | VCOM buffer output |
VCOMIN | 11 | 14 | I | Positive input terminal of the VCOM buffer. When the VCOM buffer is not used, this terminal can be connected to GND to reduce the overall quiescent current of the IC. |
VIN | 4 | 7 | I | Input voltage pin of the device |
PowerPAD™/ Thermal Die |
— | — | — | The PowerPAD or exposed thermal die needs to be connected to the power ground pins (PGND) |