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參數(shù)資料
| 型號(hào)： | SP6681EU |
| 英文描述： | High Efficiency Boost Charge Pump Regulator |
| 中文描述： | 高效率升壓充電泵穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 5/10頁(yè) |
| 文件大小： | 125K |
| 代理商： | SP6681EU |
5
Rev:A Date: 11/20/03
SP6681 High Efficiency Boost Charge Pump Regulator Copyright 2002 Sipex Corporation
P
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
INPUT
/ 4), 32.768kHz (f
x 1), and
262.14kHz (f
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 175
μ
A
at 8.198kHz, 230
μ
A 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 4.4
μ
A (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 V
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
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 V
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.
Figure 1. Internal Block Diagram of the SP6681
OUT
V
Voltage
CF1P
CF1N
CF2P
CF2N
CLK
C/4
Cx8
Clock
Manager
V
IN
GND
SP6681
8
6
4
5
3
Charge Pump Switch
Clock Phase
Reference
Drivers
Charge
SPump
V
OUT
CF1
CF2
C
OUT
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP6682 | High Efficiency Charge Pump Regulator for White LEDs |
| SP6682ER | High Efficiency Charge Pump Regulator for White LEDs |
| SP6682EU | High Efficiency Charge Pump Regulator for White LEDs |
| SP6682UEB | Evaluation Board Manual |
| SP6683 | High Power LED Driver for Parallel Configuration |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP6681EU/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Efficiency Boost Charge Pump Regulator |
| SP6682 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Efficiency Charge Pump Regulator for White LEDs |
| SP6682_06 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Efficiency Charge Pump Regulator for White LEDs |
| SP6682EB | 功能描述:電源管理IC開發(fā)工具 Eval Board for SP6682 Series RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| SP6682ER | 制造商:Exar Corporation 功能描述:Driver, Other |
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