The TPS6273x family provides a highly integrated ultra low power buck converter solution that is well suited for meeting the special needs of ultra-low power applications such as energy harvesting. The TPS6273x provides the system with an externally programmable regulated supply to preserve the overall efficiency of the power-management stage compared to a linear step-down converter. This regulator is intended to step-down the voltage from an energy storage element such as a battery or super capacitor to supply the rail to low-voltage electronics. The regulated output has been optimized to provide high efficiency across low-output currents (<10 µA) to high currents (200 mA).
The TPS6273x integrates an optimized hysteretic controller for low-power applications. The internal circuitry uses a time-based sampling system to reduce the average quiescent current.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
TPS6273x | VQFN (14) | 3.50 mm × 3.50 mm |
Changes from B Revision (July 2013) to C Revision
Changes from A Revision (March 2013) to B Revision
Changes from * Revision (October 2012) to A Revision
To further assist users in the strict management of their energy budgets, the TPS6273x toggles the input power-good indicator to signal an attached microprocessor when the voltage on the input supply has dropped below a preset critical level. This signal is intended to trigger the reduction of load currents to prevent the system from entering an undervoltage condition. In addition, independent enable signals allow the system to control whether the converter is regulating the output, monitoring only the input voltage, or to shut down in an ultra-low quiescent sleep state.
The input power-good threshold and output regulator levels are programmed independently through external resistors.
All the capabilities of TPS6273x are packed into a small footprint 14-lead 3.5-mm × 3.5-mm QFN package (RGY).
PIN | DESCRIPTION | |||
---|---|---|---|---|
NAME | TPS62736 RGY |
TPS62737 RGY |
TYPE | |
EN1 | 5 | 5 | Input | Digital input for chip enable, standby, and ship-mode. EN1 = 1 sets ship mode independent of EN2. EN1=0, EN2 = 0 disables the buck converter and sets standby mode. EN1=0, EN2=1 enables the buck converter. Do not leave either pin floating. |
EN2 | 6 | 6 | Input | |
IN | 1 | 1 | Input | Input supply to the buck regulator |
NC | 2, 3, 4, 14 | 4, 14 | Input | Connect to VSS |
OUT | 11 | 11 | Output | Step down (buck) regulator output |
SW | 13 | 2, 13 | Input | Inductor connection to switching node |
Thermal Pad | 15 | 15 | Input | Connect to VSS |
VIN_OK | 10 | 10 | Output | Push-pull digital output for power-good indicator for the input voltage. Pulled up to VIN pin. |
VIN_OK_SET | 8 | 8 | Input | Resistor divider input for VIN_OK threshold. Pull to VIN to disable. Do not leave pin floating. |
VOUT_SET | 9 | 9 | Input | Resistor divider input for VOUT regulation level |
VRDIV | 7 | 7 | Output | Resistor divider biasing voltage |
VSS | 12 | 3, 12 | Input | Ground connection for the device |