JAJSNG4B January 2015 – January 2022 TPS65251-1 , TPS65251-2 , TPS65251-3
PRODUCTION DATA
PIN | I/O | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
RLIM3 | 1 | I | Current limit setting for Buck 3. Fit a resistor from this pin to ground to set the peak current limit on the output inductor. |
SS3 | 2 | I | Soft-start pin for Buck 3. Fit a small ceramic capacitor to this pin to set the converter soft-start time. |
COMP3 | 3 | O | Compensation for Buck 3. Fit a series RC circuit to this pin to complete the compensation circuit of this converter. |
FB3 | 4 | I | Feedback input for Buck 3. Connect a divider set to 0.8 V from the output of the converter to ground. |
SYNC | 5 | I | Synchronous clock input. If there is a sync clock in the system, connect to the pin. When not used, connect to GND. |
ROSC | 6 | I | Oscillator set. This resistor sets the frequency of the internal autonomous clock. If external synchronization is used, the resistor should be fitted and set to about 70% of external clock frequency. |
FB1 | 7 | I | Feedback pin for Buck 1. Connect a divider set to 0.8 V from the output of the converter to ground. |
COMP1 | 8 | O | Compensation pin for Buck 1. Fit a series RC circuit to this pin to complete the compensation circuit of this converter. |
SS1 | 9 | I | Soft-start pin for Buck 1. Fit a small ceramic capacitor to this pin to set the converter soft-start time. |
RLIM1 | 10 | I | Current limit setting pin for Buck 1. Fit a resistor from this pin to ground to set the peak current limit on the output inductor. |
EN1 | 11 | I | Enable pin for Buck 1. A low-level signal on this pin disables it. If pin is left open, a weak internal pull-up to V3V allows for automatic enable. For a delayed start-up, add a small ceramic capacitor from this pin to ground. |
BST1 | 12 | I | Bootstrap capacitor for Buck 1. Fit a 47-nF ceramic capacitor from this pin to the switching node. |
VIN1 | 13 | I | Input supply for Buck 1. Fit a 10-µF ceramic capacitor close to this pin. |
LX1 | 14 | O | Switching node for Buck 1 |
15 | |||
LX2 | 16 | O | Switching node for Buck 2 |
17 | |||
VIN2 | 18 | I | Input supply for Buck 2. Fit a 10-µF ceramic capacitor close to this pin. |
BST2 | 19 | I | Bootstrap capacitor for Buck 2. Fit a 47-nF ceramic capacitor from this pin to the switching node. |
EN2 | 20 | I | Enable pin for Buck 2. A low-level signal on this pin disables it. If pin is left open, a weak internal pull-up to V3V allows for automatic enable. For a delayed start-up, add a small ceramic capacitor from this pin to ground. |
RLIM2 | 21 | I | Current limit setting for Buck 2. Fit a resistor from this pin to ground to set the peak current limit on the output inductor. |
SS2 | 22 | I | Soft-start pin for Buck 2. Fit a small ceramic capacitor to this pin to set the converter soft-start time. |
COMP2 | 23 | O | Compensation pin for Buck 2. Fit a series RC circuit to this pin to complete the compensation circuit of this converter |
FB2 | 24 | I | Feedback input for Buck 2. Connect a divider set to 0.8 V from the output of the converter to ground. |
LOW_P | 25 | I | Low-power operation mode (active-high) input for TPS65251 |
GND | 26 | Ground pin | |
PGOOD | 27 | O | Power good. Open-drain output asserted after all converters are sequenced and within regulation. Polarity is factory selectable (active-high default). |
V7V | 28 | O | Internal supply. Connect a 10-μF ceramic capacitor from this pin to ground. |
V3V | 29 | O | Internal supply. Connect a 3.3- to 10-μF ceramic capacitor from this pin to ground. |
AGND | 30 | Analog ground. Connect all GND pins and the power pad together. | |
GND | 31 | Ground pin | |
VIN | 32 | I | Input supply |
33 | |||
34 | |||
GND | 35 | Ground pin | |
LX3 | 36 | O | Switching node for Buck 3 |
37 | |||
VIN3 | 38 | Input supply for Buck 3. Fit a 10-µF ceramic capacitor close to this pin. | |
BST3 | 39 | I | Bootstrap capacitor for Buck 3. Fit a 47-nF ceramic capacitor from this pin to the switching node. |
EN3 | 40 | I | Enable pin for Buck 3. A low-level signal on this pin disables it. If pin is left open, a weak internal pull-up to V3V allows for automatic enable. For a delayed start-up, add a small ceramic capacitor from this pin to ground. |
PAD | — | — | Power pad. Connect to ground. |