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TPS60133PWP Datasheet(PDF) 4 Page - Texas Instruments

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No. de pieza TPS60133PWP
Descripción Electrónicos  REGULATED 5-V, 300 mA HIGH EFFICIENCY CHARGE PUMP DC/DC CONVERTERS
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Fabricante Electrónico  TI [Texas Instruments]
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TPS60133PWP Datasheet(HTML) 4 Page - Texas Instruments

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TPS60130, TPS60131, TPS60132, TPS60133
REGULATED 5-V, 300 mA HIGH EFFICIENCY CHARGE PUMP
DC/DC CONVERTERS
SLVS258A – NOVEMBER 1999 – REVISED DECEMBER 1999
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
µA. The output is disconnected from the input when the device is disabled.
FB
4
I
Feedback input. Connect FB to OUT as close to the load as possible to achieve best regulation. A resistive divider
is on the chip to match internal reference voltage of 1.21 V.
GND
1, 2,
19, 20
Ground. Analog ground for internal reference and control circuitry. Connect to PGND terminals through a short
trace.
IN
7,14
I
Supply input. Bypass IN to PGND with a capacitor that has half of the capacitance of the output capacitor. Connect
both IN terminals together through a short trace.
LBO/PG
17
O
Low battery detector output (TPS60130 and TPS60132) or power good output (TPS60131 and TPS60133). Open
drain output of the low battery or power good comparator. It can sink 1 mA. A 100-k
Ω to 1-MΩ pullup resistor to OUT
is recommended. Leave the terminal unconnected if the low battery or power good detector is not used.
LBI/NC
18
I
Low battery detector input (TPS60130 and TPS60132 only). The voltage at this input is compared to the internal
1.21 V reference voltage. Connect this terminal to ground if the low-battery detection function is not used. On the
TPS60131 and TPS60133, this terminal is not connected.
OUT
5, 16
O
Regulated 5-V 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 terminals together.
detailed description
operating principle
The TPS6013x charge pumps provide a regulated 5-V output from a 2.7-V to 5.4-V input. They deliver a
maximum load current of 300 mA or 150 mA, respectively. Designed specifically for space-critical, battery-
powered applications, the complete charge pump circuit requires four external capacitors. The circuit is
optimized for efficiency over a wide input voltage range.
The TPS6013x 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/startup circuit, a low-battery
or power-good comparator, and a control circuit (see functional block diagrams).
The device consists of two single-ended charge pumps. These charge pumps are automatically configured to
amplify the input voltage with a conversion factor of 1.5 or 2. The conversion ratio is dependent on the input
voltage and load current. This assures high efficiency over a wide input voltage range and is further described
in the
adaptive mode switching section below.
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 bigger 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.


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