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参数资料
| 型号： | TPS62650YFFR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.7 A SWITCHING REGULATOR, 6600 kHz SWITCHING FREQ-MAX, BGA9 |
| 封装： | GREEN, DSBGA-9 |
| 文件页数： | 15/38页 |
| 文件大小： | 820K |
| 代理商： | TPS62650YFFR |
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SLVS808A
– AUGUST 2009 – REVISED FEBRUARY 2011
UNDERVOLTAGE LOCKOUT
The undervoltage lockout circuit prevents the device from misoperation at low input voltages. It prevents the
converter from turning on the switch or rectifier MOSFET under undefined conditions. The TPS6265x device
have a UVLO threshold set to 2.05V (typical). Fully functional operation is permitted down to 2.15 V input
voltage.
SHORT-CIRCUIT PROTECTION
The TPS6265x integrates a P-channel MOSFET current limit to protect the device against heavy load or short
circuits. When the current in the P-channel MOSFET reaches its current limit, the P-channel MOSFET is turned
off and the N-channel MOSFET is turned on. The regulator continues to limit the current on a cycle-by-cycle
basis.
As soon as the output voltage falls below ca. 0.4V, the converter current limit is reduced to half of the nominal
value and the PWROK bit is reset. Because the short-circuit protection is enabled during start-up, the device
does not deliver more than half of its nominal current limit until the output voltage exceeds approximately 0.5V.
This needs to be considered when a load acting as a current sink is connected to the output of the converter.
THERMAL SHUTDOWN
As soon as the junction temperature, TJ, exceeds typically 140°C, the device goes into thermal shutdown. In this
mode, the P- and N-channel MOSFETs are turned off. The device continues its operation when the junction
temperature again falls below typically 130
°C.
VOLTAGE AND MODE SELECTION
The TPS6265x features a pin-selectable output voltage. VSEL is primarily used to scale the output voltage
between active (VSEL = HIGH) and sleep mode (VSEL = LOW). For maximum flexibility, it is possible to
reprogram the operating mode of the converter (e.g. forced PWM, or auto transition PFM/PWM) associated with
VSEL signal via the I2C interface
VSEL output voltage and mode selection is defined as following:
VSEL = LOW:
–– DC/DC output voltage determined by VSEL0 register value. DC/DC mode of operation is
determined by MODE0 bit in CONTROL1 register.
VSEL = HIGH:
–– DC/DC output voltage determined by VSEL1 register value. DC/DC mode of operation is
determined by MODE1 bit in CONTROL1 register.
The application processor programs via I2C the output voltages associated with the two states of VSEL signal:
floor (VSEL0) and roof (VSEL1) values. The application processor also writes the DEFSLEW value in the
CONTROL2 register to control the output voltage ramp rate.
These two registers can be continuously updated via I2C to provide the appropriate output voltage according to
the VSEL input. The voltage changes with the selected ramp rate immediately after writing to the VSEL0 or
VSEL1 register.
Table 1 shows the output voltage states depending on VSEL0, VSEL1 registers, and VSEL signal.
Table 1. Dynamic Voltage Scaling Functional Overview
VSEL PIN
VSEL0 REGISTER
VSEL1 REGISTER
OUTPUT VOLTAGE
Low
No action
Floor
Low
Write new value
No action
Change to new value
Low
No action
Write
No change stays at floor voltage
High
No action
Roof
High
Write new value
No action
No change stays at roof voltage
High
No action
Write new value
Change to new value
22
2009–2011, Texas Instruments Incorporated
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