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参数资料
| 型号： | TPS65111RGERG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR REGULATOR, 520 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封装： | 4 X 4 MM, GREEN, PLASTIC, QFN-24 |
| 文件页数： | 3/19页 |
| 文件大小： | 483K |
| 代理商： | TPS65111RGERG4 |
TPS65110
TPS65111
SLVS495 SEPTEMBER 2003
www.ti.com
11
DETAILED DESCRIPTION
VCC Charge Pump
The VCC output provides a very high efficiency, regulated, dc/dc conversion through a wide input range by
supporting x1.0, x1.33, x1.5, and x2.0 boost charge pump operation. TPS65110 automatically sets the boost
ratio based on input and output voltage conditions. For example, when the input voltage from a battery becomes
lower, the device automatically increases the boost ratio from x1.33 to x1.5. In a fixed input voltage mode, the
device provides for higher conversion efficiency; for example, in the case of 2.8 V to 3.3 V conversion or 2.8
V to 5.0 V conversion. In this case, the VCC charge pump can enter into a SKIP mode operation in order to
maintain the efficiency of a low load condition. The highest frequency of the charge pump is 400 kHz (typ). The
charge pump operates by using higher frequencies in the heavier load current conditions, and decreases the
frequency in the lighter load conditions. Maximum output current and operating frequency characteristics are
dependent on external conditions such as the flying capacitor, output capacitor, and ambient temperature
range.
VCC[V]
VIN [V]
VCC[V]
2.4
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
4.0
4.1
4.2
4.4
4.6
4.8
5.0
5.2
5.4
5.5
3.3
x1.5
x1.33
x1
5.0
NA
x2
x1.5
x1.33
x1
NOTE: Gray portion is HYSTERESIS.
Of importance, the VCC charge pump is also used as the power source for the VDD and VSS charge pumps.
Therefore, consider a case where the VDD charge pump’s output current is required to be 2mA, and the boost
ratio is x3. With this condition, the required (additional) current for the VCC output is slightly more than 6 mA.
If the VSS charge pump output current requirement is 1 mA, then the (additional) required current from VCC
is another 1 mA. (Note: the VCC charge pump maintains a minimum of 16-mA output capability in addition to
the loads required to support the VDD and VSS charge pumps under the recommended conditions.)
VDD Charge Pump
The power source for the VDD charge pump is the VCC charge pump. The output voltage and boost ratio of
the VDD charge pump are fixed at either a 7.5 V and x3 boost (TPS65110), or a 9.0 V and x2 boost (TPS65111).
The topology of this charge pump is SKIP mode, and the maximum frequency is 400 kHz. Maximum output
current is dependent on the flying capacitors and ambient temperature range (refer to the typical
characteristics).
VSS Charge Pump
The VSS charge pump is powered from the VCC charge pump and has a fixed output voltage of either –2.7
V (TPS65110) or –3.0 V (TPS65111). The boost ratio for the VSS charge pump is fixed at x1. The operation
topology is SKIP mode and has a maximum frequency of 400 kHz. Maximum output current is dependent on
the flying capacitor and ambient temperature range (refer to the typical characteristics).
UVLO Under Voltage Lockout
The UVLO provides for the save operation of the device. It prevents the converter from turning on when the
voltage on the VIN pin is less than the threshold voltage of UVLO. Note that although the input voltage range
of the product is shown to be down to 2.4 V, the maximum threshold of the UVLO for a rising VIN is 2.5 V.
Therefore, to operate down to 2.4 V, the device must first be powered by a source of more than 2.5 V.
Enable
Low logic on the EN pin forces the TPS6511x into shutdown mode. In shutdown, the power switch, drivers,
voltage reference, oscillator, and all other functions are turned off. The supply current is reduced to less than
1
A in shutdown mode.
Power-Up and Power-Down Sequencing
The TPS65110/11 controls power-up and power-down sequence through an enable pin. This signal should be
terminated and not be left floating to prevent miss-operation.
Power-Up Sequence
When the enable pin EN is pulled high, the device starts its power on sequencing. The VCC output starts up
first. When the output voltage VCC has reached 75% of its nominal value, the VSS output comes up next. When
VSS has reached 75% of the nominal value, the positive output VDD finally comes up.
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