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| 型号： | TPS61097-18DBVR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.475 A BATTERY CHARGE CONTROLLER, PDSO5 |
| 封装： | 2.80 X 2.90 MM, PLASTIC, SOT-23, 5 PIN |
| 文件页数： | 10/26页 |
| 文件大小： | 0K |
| 代理商： | TPS61097-18DBVR |
R1 = R2 ×
V
OUT
V
FB
– 1
TPS61097-01
V
0.9 V to VOUT
IN
VOUT
EN
L
GND
VIN
L1
R2
R1
C1
C2
V
1.8 V to 5.5 V
OUT
FB
TPS61097
SLVS872B – JUNE 2009 – REVISED DECEMBER 2009
www.ti.com
APPLICATION INFORMATION
Design Procedure
The TPS61097 DC/DC converters are intended for systems powered by a single up to triple cell Alkaline, NiCd,
NiMH battery with a typical terminal voltage between 0.9 V and 5.5 V. They can also be used in systems
powered by one-cell Li-Ion or Li-Polymer with a typical voltage between 2.5 V and 4.2 V. Additionally, any other
voltage source like solar cells or fuel cells with a typical output voltage between 0.9 V and 5.5 V can power
systems where the TPS61097 is used. The TPS61097 does not down-regulate VIN; therefore, if VIN is greater
than VOUT, VOUT tracks VIN.
Programming the Output Voltage
Within the TPS61097 family, there are fixed and adjustable output voltage versions available. For the adjustable
output voltage versions, an external resistor divider is used to adjust the output voltage. The resistor divider must
be connected between VOUT, FB, and GND. When the output voltage is regulated properly, the typical value of
the voltage at the FB pin is 1.2 V. The maximum recommended value for the output voltage is 5.5 V. The current
through the resistive divider should be about 100 times greater than the current into the FB pin. The typical
current into the FB pin is 0.01
μA, and the voltage across the resistor between FB and GND, R2, is typically 1.2
V. Based on those two values, the recommended value for R2 should be lower than 500 k
, in order to set the
divider current at 1
μA or higher. It is recommended to keep the value for this resistor in the range of 100 k.
Equation 1 calculates the value of R1 to set the desired output voltage:
(1)
As an example, if an output voltage of 2.5 V is needed, a 162-k
resistor should be chosen for R1 when a
150-k
has been selected for R2.
Figure 18. Typical Application Circuit for Adjustable Output Voltage Option
Adjustable Bypass Switching
The EN pin can be set up as a low voltage control for the bypass switch. By setting the desired ratio of R1 and
R2, the TPS61097 can be set to switch on the bypass at a defined voltage level on VIN. For example, setting R1
and R2 to 200K
would set VEN to half of VIN. The voltage level of VIN engaging the bypass switch is based on
the VIL level of EN (0.65 V). If VIN is less than 1.30 V then the bypass switch will be enabled. For VIN values
above 1.50 V (50% of VIH) the bypass switch is disabled.
18
Copyright 2009, Texas Instruments Incorporated
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相关代理商/技术参数 |
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| TPS61097-18DBVT | 制造商:TI 制造商全称:Texas Instruments 功能描述:LOW INPUT VOLTAGE SYNCHRONOUS BOOST CONVERTER WITH LOW QUIESCENT CURRENT |
| TPS61097-18DRSR | 制造商:TI 制造商全称:Texas Instruments 功能描述:LOW INPUT VOLTAGE SYNCHRONOUS BOOST CONVERTER WITH LOW QUIESCENT CURRENT |
| TPS61097-27DBVR | 制造商:TI 制造商全称:Texas Instruments 功能描述:LOW INPUT VOLTAGE SYNCHRONOUS BOOST CONVERTER WITH LOW QUIESCENT CURRENT |
| TPS61097-27DBVT | 制造商:TI 制造商全称:Texas Instruments 功能描述:LOW INPUT VOLTAGE SYNCHRONOUS BOOST CONVERTER WITH LOW QUIESCENT CURRENT |
| TPS61097-27DRSR | 制造商:TI 制造商全称:Texas Instruments 功能描述:LOW INPUT VOLTAGE SYNCHRONOUS BOOST CONVERTER WITH LOW QUIESCENT CURRENT |
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