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参数资料
| 型号： | TPS65200YFFT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, BGA36 |
| 封装： | 2.80 X 2.60 MM, 0.40 MM PITCH, GREEN, DSBGA-36 |
| 文件页数： | 30/59页 |
| 文件大小： | 2424K |
| 代理商： | TPS65200YFFT |
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SLVSA48 – APRIL 2010
www.ti.com
Boost Start Up
To prevent the inductor saturation and limit the inrush current, a soft-start control is applied during the boost start
up.
PFM Mode at Light Load
In boost mode, TPS65200 will operate in pulse skipping mode (PFM mode) to reduce the power loss and
improve the converter efficiency at light load condition. During boosting, the PWM converter is turned off once
the inductor current is less than 75 mA; and the PWM is turned back on only when the voltage at PMID pin drops
to about 99.5% of the rated output voltage. A unique pre-set circuit is used to make the smooth transition
between PWM and PFM mode.
Safety Timer in Boost Mode (BST32SI)
At the beginning of boost operation, the TPS65200 starts a 32-second timer that is reset by the host through any
valid I2C transaction to the IC. Once the 32-second timer expires, TPS65200 will turn off the boost converter,
issue an interrupt, set the BST32SI bit in the INT3 register, and return to HiZ mode. Fault condition is cleared by
POR or reading the INT3 register.
Protection in Boost Mode
Output Over-Voltage Protection (BSTBUSOVI)
The TPS65200 provides a built-in over-voltage protection to protect the device and other components against
damage if the VBUS voltage gets too high. When an over-voltage condition is detected, TPS65200 turns off the
PWM converter, resets CH_EN[1:0] bits to 00b (OFF), sets the BSTBUSOVI bit in the INT3 register, issues an
interrupt, and enters HiZ mode. Once VVBUS drops to the normal level, the boost will start after host sets
CH_EN[1:0] = 01b.
Output Over-Load Protection (BSTOLI)
The TPS65200 provides a built-in over-load protection to prevent the device and battery from damage when
VBUS is over loaded. Once an over load condition is detected, Q1 will operate in linear mode to limit the output
current while VPMID is kept in voltage regulation. If the over load condition lasts for more than 30 ms, the
over-load fault is detected. When an over-load condition is detected, TPS65200 turns off the PWM converter,
resets CH_EN[1:0] bits to 00b (OFF), sets the BSTOLI bit in the INT3 register, and issues an interrupt. The boost
will not start until the host sets CH_EN[1:0] = 01b or the OTG pin is toggled.
Battery Voltage Protection (BSTLOWVI, BSTBATOVI)
During boosting, when battery voltage is above the battery over voltage threshold, VBATMAX, or below the
minimum battery voltage threshold, VBATMIN, TPS65200 will turn off the PWM converter, reset CH_EN[1:0] bits to
00b (OFF), set the BSTLOWVI or BSTBATOVI bit in the INT3 register, and issues an interrupt. Once the battery
voltage goes back to the normal level, the boost will start if the host sets CH_EN[1:0] = 01b or the OTG pin is
toggled.
HIGH IMPEDANCE MODE
When CH_EN[1:0] bits in the CONTROL register are set to 00b, TPS65200 will operate in high impedance mode,
with the impedance looking into VBUS pin higher than 500k
Ω.
HV LDO
TPS65200 provides a 4.9-V LDO that is powered off the VBUS input. The LDO is enabled whenever VVBUS >
VUVLO (3.3 V) and disabled when VVBUS > VOVP-IN_USB (6.5 V). LDO output voltage follows VBUS for VVBUS < 4.9 V
and is regulated to 4.9 V when VVBUS > 4.9 V. In any case output current is limited to 100 mA. The LDO can also
be disabled by the host by setting the LDO_EN bit of the CONTROL register to 0. An operational flow chart of
the LDO enable is shown in Figure 55.
36
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TPS65200
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