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参数资料
型号： TPS60121PWPRG4
厂商： TEXAS INSTRUMENTS INC
元件分类： 稳压器
英文描述： 0.2 A SWITCHED CAPACITOR REGULATOR, 450 kHz SWITCHING FREQ-MAX, PDSO20
封装： GREEN, PLASTIC, HTSSOP-20
文件页数： 25/30页
文件大小： 878K
代理商： TPS60121PWPRG4
TPS60120, TPS60121, TPS60122, TPS60123, TPS60124, TPS60125
REGULATED 200-mA HIGH EFFICIENCY CHARGE PUMP
DC/DC CONVERTERS
SLVS257B – NOVEMBER 1999 – REVISED AUGUST 2000
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME
NO.
I/O
DESCRIPTION
C1+
6
Positive terminal of the flying capacitor C1
C1–
8
Negative terminal of the flying capacitor C1
C2+
15
Positive terminal of the flying capacitor C2
C2–
13
Negative terminal of the flying capacitor C2
ENABLE
3
I
ENABLE input. Connect ENABLE to IN for normal operation. When ENABLE is a logic low, the device turns off and
the supply current decreases to 0.05
A. The output is disconnected from the input when the device is placed in
shutdown.
FB
4
I
Feedback input. Connect FB to OUT as close to the load as possible to achieve best regulation. Resistive divider
is on the chip to match the internal reference voltage of 1.21 V.
GND
1, 2,
19, 20
Ground. Analog ground for internal reference and control circuitry. Connect to PGND through a short trace.
IN
7,14
I
Supply input. Connect to an input supply in the 1.8-V to 3.6-V range. Bypass IN to PGND with a (CO/2) F capacitor.
Connect both INs through a short trace.
LBO/PG
17
O
Low battery detector output or power good output. Open drain output of the low battery or power-good comparator.
It can sink 1 mA. A 100-k
to 1-M pullup is recommended. Leave terminal unconnected if not used.
LBI/NC
18
I
Low battery detector input (TPS60120/TPS60122/TPS60124 only). The input is compared to the internal 1.21-V
reference voltage. Connect terminal to ground if the low-battery detector function is not used. On the TPS60121,
TPS60123, and TPS60125, this terminal is not connected.
OUT
5, 16
O
Regulated power output. Connect both OUT terminals through a short trace and bypass OUT to GND with the output
filter capacitor CO.
PGND
9–12
Power ground. Charge-pump current flows through this pin. Connect all PGND pins together.
detailed description
operating principle
The TPS6012x charge pumps provide a regulated 3.3-V or 3-V output from a 1.8-V to 3.6-V input. They are
designed for a maximum load current of at least 200 mA or 100 mA, respectively. Designed specifically for
space-critical, battery-powered applications, the complete charge pump circuit requires only four external
capacitors. The circuit is optimized for efficiency over a wide input voltage range.
The TPS6012x charge pumps consist of an oscillator, a 1.21-V bandgap reference, an internal resistive
feedback circuit, an error amplifier, high current MOSFET switches, a shutdown/start-up circuit, a low-battery
or power-good comparator, and a control circuit (see the functional block diagram).
The device consists of two single-ended charge pumps. The power stages of the charge pump are automatically
configured to amplify the input voltage with a conversion factor of 1.5 or 2. The conversion ratio depends on
input voltage and output current. With input voltages lower than approximately 2.4 V, the convertor will run in
a voltage doubler mode with a gain of two. With a higher input voltage, the converter operates with a gain of
1.5. This assures high efficiency over the wide input voltage range of a two-cell battery stack and is further
described in the
adaptive mode switching section.
adaptive mode switching
The ON-resistance of the MOSFETs that are in the charge path of the flying capacitors is regulated when the
charge pump operates in voltage doubler-mode. It is changed depending on the output voltage that is fed back
into the control loop. This way, the time-constant during the charging phase can be modified and increased
versus a time-constant for fully switched-on MOSFETs. The ON-resistance of both switches and the
capacitance of the flying capacitor define the time constant. The MOSFET switches in the discharge path of the
charge pump are always fully switched on to their minimum rDS(on). With the time-constant during charge phase
being larger than the time constant in discharge phase, the voltage on the flying capacitors stabilizes to the
lowest possible value necessary to get a stable VO.
相关PDF资料
PDF描述
TPS60122PWPR 0.2 A SWITCHED CAPACITOR REGULATOR, 450 kHz SWITCHING FREQ-MAX, PDSO20
TPS60124PWP 0.2 A SWITCHED CAPACITOR REGULATOR, 450 kHz SWITCHING FREQ-MAX, PDSO20
TPS60121PWPR 0.2 A SWITCHED CAPACITOR REGULATOR, 450 kHz SWITCHING FREQ-MAX, PDSO20
TPS60122PWP 0.2 A SWITCHED CAPACITOR REGULATOR, 450 kHz SWITCHING FREQ-MAX, PDSO20
TPS60123PWPG4 0.2 A SWITCHED CAPACITOR REGULATOR, 450 kHz SWITCHING FREQ-MAX, PDSO20
相关代理商/技术参数
参数描述
TPS60122 制造商:TI 制造商全称:Texas Instruments 功能描述:REGULATED 3.3 V, 200-mA HIGH EFFICIENCY CHARGE PUMP DC/DC CONVERTERS
TPS60122PWP 功能描述:电荷泵 Reg 3.3V Hi-Eff Chrg Pump DC/DC Converter RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube
TPS60122PWPG4 功能描述:电荷泵 Reg 3.3V Hi-Eff Chrg Pump DC/DC Converter RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube
TPS60122PWPR 功能描述:电荷泵 Reg 3.3V Hi-Eff Chrg Pump DC/DC Converter RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube
TPS60122PWPRG4 功能描述:电荷泵 Reg 3.3V Hi-Eff Chrg Pump DC/DC Converter RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube
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