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PDF SP6681 Data sheet ( Hoja de datos )
| Número de pieza | SP6681 | |
| Descripción | High Efficiency Boost Charge Pump Regulator | |
| Fabricantes | Sipex | |
| Logotipo |  |
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® SP6681
High Efficiency Boost Charge Pump Regulator
FEATURES
APPLICATIONS
■ Ideal for Li Ion or 3V to 5V Conversion
■ Low Profile, Inductorless Regulator
■ Up To 96% Power Efficiency
■ +2.7V to +5.5V Input Voltage Range
■ 5.0V, 50mA Output, 4% Accuracy
■ Low EMI Design
■ Low Quiescent Current: 175µA
■ Low Shutdown Current: 4µA
■ Optional External Clock: 32.768kHz
■ Thermal Shutdown Protection
■ Programmable Frequencies:
8.192kHz, 32.768kHz, or 262.14kHz
■ Internal Oscillator: 16kHz or 130kHz,
when CLK Pin Is Held High
■ Ultra small 10-Pin MSOP Package
■ GSM SIM Card Power Supplies
■ 3V to 5V Boost Applications
■ Li Ion to 5.0V Boost Applications
■ White LED Driver
■ Smart Card Readers
DESCRIPTION
The SP6681 is a charge pump ideal for converting a +3.6V Li-Ion battery input to a +5.0V
regulated output. An input voltage range of +2.7V to +5.5V is converted to a regulated output
of 5.0V. The SP6681 device will operate at three different switching frequencies correspond-
ing to three different output resistances and load current ranges. An external 32.768kHz
nominal clock signal is used to produce three synchronized pump frequencies through the use
an internal phase lock loop to drive the charge pump. Two control inputs can adjust the internal
pump frequency on the fly to 8.192kHz (fINPUT / 4), 32.768kHz (fINPUT x 1), or 262.14kHz (fINPUT
x 8). The charge pump configuration dynamically changes to optimize power efficiency. At
low input voltages the charge pump doubles the input while at higher inputs the output is 1.5
times the input. The SP6681 can deliver high power efficiencies up to 96% with low quiescent
currents from 175µA to 800µA. The SP6681 is offered in a 10-Pin µSOIC package.
2.2µF
2.2µF
+3.6V
Lithium-Ion
Battery
4.7µF
CF1P
2
VIN 3
C/4
Cx8
CLK
CF1N
9
CF2P
10
CF2N
7
SP6681
1 VOUT
+5.0V output
456
8
GND
2.2µF
*All Capacitors Are Ceramic
Rev:A Date: 11/20/03
SP6681 High Efficiency Boost Charge Pump Regulator
1
© Copyright 2002 Sipex Corporation
1 page  
DESCRIPTION
The SP6681 device is a regulated CMOS charge
pump voltage converter that can be used to
convert a +2.7V to +5.5V input voltage to a
nominal +5.0V output. These devices are ideal
for cellular phone designs involving battery-
powered and/or board level voltage conversion
applications.
An external clock signal with a frequency of
32.768kHz nominal is required for device
operation. A designer can set the SP6681 device
to operate at 3 different charge pump frequencies:
8.192kHz (f / 4), 32.768kHz (f x 1), and
INPUT
INPUT
262.14kHz (fINPUT x 8). The three frequencies
correspond to three nominal load current ranges:
2mA, 20mA, and 50mA, respectively. The
SP6681 device optimizes for high power
efficiency with a low quiescent current of 175µA
at 8.198kHz, 230µA at 32.768kHz, and 800µA
at 262.14kHz. When there is no external clock
signal input, the device is in a low-power
shutdown mode drawing 4.4µA (typical) current.
The SP6681 device is ideal for designs using
+3.6V lithium ion batteries such as cell phones,
PDAs, medical instruments, and other portable
equipment. For designs involving power sources
above +2.7V up to +5.5V, the internal charge
pump switch architecture dynamically selects an
operational mode that optimizes efficiency. The
SP6681 device regulates the maximum output
voltage to +5.0V.
THEORY OF OPERATION
There are seven major circuit blocks for the
SP6681 device. Refer to Figure 1.
1) The Voltage Reference contains a band gap
and other circuits that provide the proper current
biases and voltage references used in the other
blocks.
2) The Clock Manager accepts the digital input
voltage levels (including the input clock) and
translates them to VCC and 0V. It also determines
if a clock is present in which case the device is
powered up. If the CLK input is left floating or
pulled near ground, the device shuts down and
V is shorted to V . The worst case digital low
IN OUT
is 0.4V and the worst case digital high is 1.3V.
This block contains a synthesizer that generates
the internal pump clock which runs at the
frequency controlled with the C/4 and Cx8 logic
pins.
3) The Charge Pump Switch Configuration
Control determines the pump configuration
depending upon VIN as described earlier and
programs the Clock Phase Control. For an input
supply voltage from +2.7V to +3.7V, an X2
doubling architecture is enabled. This mode
requires one flying capacitor and one output
capacitor. For an input supply voltage greater
than +3.7V up to +5.5V, an X1.5 multiplier
architecture is enabled. This mode requires two
flying capacitors and one output capacitor.
VIN 3
CLK
C/4
Cx8
6
4
5
Voltage
Reference
Clock
Manager
Charge Pump Switch
Configuration Control
Clock Phase
Reference
VOUT
Control
SP6681
Drivers
8
GND
CF1P
CF1N
CF2P
Charge
Pump CF2N
Switches
VOUT
CF1
CF2
COUT
Figure 1. Internal Block Diagram of the SP6681
Rev:A Date: 11/20/03
SP6681 High Efficiency Boost Charge Pump Regulator
5
© Copyright 2002 Sipex Corporation
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet SP6681.PDF ] | |
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