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| 型号： | TPS61092RSARG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2.5 A BATTERY CHARGE CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封装： | 4 X 4 MM, GREEN, PLASTIC, QFN-16 |
| 文件页数： | 8/24页 |
| 文件大小： | 753K |
| 代理商： | TPS61092RSARG4 |
www.ti.com
Device Enable
Undervoltage Lockout
Softstart
Power Save Mode and Synchronization
Low Battery Detector Circuit—LBI/LBO
TPS61090
TPS61091, TPS61092
SLVS484A – JUNE 2003 – REVISED APRIL 2004
Detailed Description (continued)
The device is put into operation when EN is set high. It is put into a shutdown mode when EN is set to GND. In
shutdown mode, the regulator stops switching, all internal control circuitry including the low-battery comparator is
switched off, and the load is isolated from the input (as described in the Synchronous Rectifier Section). This
also means that the output voltage can drop below the input voltage during shutdown. During start-up of the
converter, the duty cycle and the peak current are limited in order to avoid high peak currents drawn from the
battery.
An undervoltage lockout function prevents device start-up if the supply voltage on VBAT is lower than typically
1.6 V. When in operation and the battery is being discharged, the device automatically enters the shutdown
mode if the voltage on VBAT drops below approximately 1.6 V. This undervoltage lockout function is
implemented in order to prevent the malfunctioning of the converter.
When the device enables the internal startup cycle starts with the first step, the precharge phase. During
precharge, the rectifying switch is turned on until the output capacitor is charged to a value close to the input
voltage. The rectifying switch current is limited in that phase. This also limits the output current under short-circuit
conditions at the output. After charging the output capacitor to the input voltage the device starts switching. Until
the output voltage is reached, the boost switch current limit is set to 40% of its nominal value to avoid high peak
currents at the battery during startup. When the output voltage is reached, the regulator takes control and the
switch current limit is set back to 100%.
The SYNC pin can be used to select different operation modes. To enable power save, SYNC must be set low.
Power save mode is used to improve efficiency at light load. In power save mode the converter only operates
when the output voltage trips below a set threshold voltage. It ramps up the output voltage with one or several
pulses and goes again into power save mode once the output voltage exceeds the set threshold voltage. This
power save mode can be disabled by setting the SYNC to VBAT.
Applying an external clock with a duty cycle between 30% and 70% at the SYNC pin forces the converter to
operate at the applied clock frequency. The external frequency has to be in the range of about
±20% of the
nominal internal frequency. Detailed values are shown in the electrical characteristic section of the data sheet.
The low-battery detector circuit is typically used to supervise the battery voltage and to generate an error flag
when the battery voltage drops below a user-set threshold voltage. The function is active only when the device is
enabled. When the device is disabled, the LBO pin is high-impedance. The switching threshold is 500 mV at LBI.
During normal operation, LBO stays at high impedance when the voltage, applied at LBI, is above the threshold.
It is active low when the voltage at LBI goes below 500 mV.
The battery voltage, at which the detection circuit switches, can be programmed with a resistive divider
connected to the LBI pin. The resistive divider scales down the battery voltage to a voltage level of 500 mV,
which is then compared to the LBI threshold voltage. The LBI pin has a built-in hysteresis of 10 mV. See the
application section for more details about the programming of the LBI threshold. If the low-battery detection
circuit is not used, the LBI pin should be connected to GND (or to VBAT) and the LBO pin can be left
unconnected. Do not let the LBI pin float.
16
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