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| 型号： | TPS61026DRCTG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2.1 A SWITCHING REGULATOR, 720 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | 3 X 3 MM, GREEN, PLASTIC, SON-10 |
| 文件页数： | 5/29页 |
| 文件大小： | 746K |
| 代理商： | TPS61026DRCTG4 |
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Undervoltage Lockout
Softstart and Short Circuit Protection
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
VBAT = 5 V
VBAT = 3.6 V
VBAT = 2.4 V
VBAT = 1.8 V
VBAT = 1.2 V
VO Output Voltage V
Precharge
Current
A
Power Save Mode
Low Battery Detector Circuit—LBI/LBO
SLVS451D – SEPTEMBER 2003 – REVISED FEBRUARY 2006
An undervoltage lockout function prevents device start-up if the supply voltage on VBAT is lower than
approximately 0.8 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 0.8 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 is current limited during that phase. The current limit increases with the output
voltage. This circuit also limits the output current under short circuit conditions at the output. Figure 21 shows the
typical precharge current vs output voltage for specific input voltages:
Figure 21. Precharge and Short Circuit Current
After charging the output capacitor to the input voltage, the device starts switching. If the input voltage is below
1.4 V the device works with a fixed duty cycle of 50% until the output voltage reaches 1.4 V. After that the duty
cycle is set depending on the input output voltage ratio. Until the output voltage reaches its nominal value, the
boost switch current limit is set to 40% of its nominal value to avoid high peak currents at the battery during
startup. As soon as the output voltage is reached, the regulator takes control and the switch current limit is set
back to 100%.
The PS pin can be used to select different operation modes. To enable power save, PS 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 PS to VBAT. In down conversion mode, power save mode is always active
and the device cannot be forced into fixed frequency operation at light loads.
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.
Copyright 2003–2006, Texas Instruments Incorporated
13
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