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TPS60141 Datasheet(PDF) 4 Page - Texas Instruments

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No. de pieza TPS60141
Descripción Electrónicos  SINGLE-CELL TO 3-V/3.3-V, 20-mA DUAL OUTPUT, HIGH-EFFICIENCY CHARGE PUMP WITH SNOOZE MODE
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS60210, TPS60211, TPS60212, TPS60213
REGULATED 3.3 V, LOW RIPPLE CHARGE PUMP
WITH ULTRALOW OPERATING CURRENT
SLVS296 − JUNE 2000
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME
NO.
I/O
DESCRIPTION
C1+
4
Positive terminal of the flying capacitor C1
C1−
3
Negative terminal of the flying capacitor C1
C2+
6
Positive terminal of the flying capacitor C2
C2−
8
Negative terminal of the flying capacitor C2
GND
2
Ground
IN
7
I
Supply input. Bypass IN to GND with a capacitor of a minimum of 2.2
µF.
LBI/GND
1
I
Low-battery detector input for TPS60210 and TPS60212. A low-battery warning is generated at the LBO pin when
the voltage on LBI drops below the threshold of 1.18 V. Connect LBI to GND or VBAT if the low-battery detector
function is not used. For the devices TPS60211 and TPS60213, this pin is a ground (GND pin).
LBO/PG
10
O
Open-drain low-battery detector output for TPS60210 and TPS60212. This pin is pulled low if the voltage on LBI
drops below the threshold of 1.18 V. A pullup resistor should be connected between LBO and OUT or any other
logic supply rail that is lower than 3.6 V.
Open-drain power-good detector output for TPS60211 and TPS60213. As soon as the voltage on OUT reaches
about 90% of its nominal value, this pin goes active high. A pullup resistor should be connected between PG and
OUT or any other logic supply rail that is lower than 3.6 V.
OUT
5
O
Regulated 3.3-V power output. Bypass OUT to GND with the output filter capacitor Co.
SNOOZE
9
I
Three operating modes can be programmed with the SNOOZE pin.
− SNOOZE = Low programs the device in the snooze mode, enabling ultralow operating current while still
maintaining the output voltage to within 3.3 V
±6%.
− SNOOZE = High programs the device into normal operation mode where it runs from the internal oscillator.
− If an external clock signal is applied to the SNOOZE pin, the charge pump operates synchronized to the
frequency of the external clock signal.
detailed description
operating principle
The TPS6021x charge pumps provide a regulated 3.3-V output from a 1.8-V to 3.6-V input. They deliver a
minimum 100-mA load current while maintaining the output at 3.3 V
±4%. Designed specifically for space critical
battery-powered applications, the complete converter requires only four external capacitors. The device is using
the push-pull topology to achieve the lowest output voltage ripple. The converter is also optimized for a very
small board space. It makes use of small-sized capacitors, with the highest output current rating per output
capacitance.
The TPS6021x circuits consist of an oscillator, a voltage reference, an internal resistive feedback circuit, an error
amplifier, two charge-pump power stages with high-current MOSFET switches, a shutdown/start-up circuit, and
a control circuit (see functional block diagrams).
push-pull operating mode
The two single-ended charge-pump power stages operate in the push-pull operating mode (i.e., they operate
with a 180
°C phase shift). Each single-ended charge pump transfers a charge into its flying capacitor (C1 or
C2) in one-half of the period. During the other half of the period (transfer phase), the flying capacitor is placed
in series with the input to transfer its charge to the load and output capacitor (Co). While one single-ended charge
pump is in the charge phase, the other one is in the transfer phase. This operation ensures that there is a
continuous flow of charge to the load, hence the output capacitor no longer needs to buffer the load current for
half of the switching cycle, avoiding the high, inherent output voltage ripple of conventional charge pumps.
In order to provide a regulated output voltage of 3.3 V, the TPS6021x devices operate either in
constant-frequency linear-regulation control mode or in pulse-skip mode. The mode is automatically selected
based on the output current. If the load current is low, the controller switches into the power-saving pulse-skip
mode to boost efficiency at low output power.


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