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PDF UC5301 Data sheet ( Hoja de datos )
| Número de pieza | UC5301 | |
| Descripción | SWITCHED-CAPACITOR VOLTAGE INVERTERS | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de UC5301 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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UNISONIC TECHNOLOGIES CO., LTD
UC5301
SWITCHED-CAPACITOR
VOLTAGE INVERTERS
DESCRIPTION
The UTC UC5301 is an unregulated charge-pump voltage
inverter. It can be used to generate a negative supply from positive
input. Input voltages varying from +1.8V to +5V can be inverted into
a -1.8V ~ -5V output supply.
The device can be operated on a 0.45mA typical current from
supplies 3.3V, which meets the requirements of battery-powered and
board level voltage conversion applications.
The UTC UC5301 can deliver 25mA output current with a voltage
drop of 250mV. The parts are over-temperature protected.
The UTC UC5301 is generally used in cell phones, PDAS, and
other portable equipments, small LCD panels, handy-terminals.
FEATURES
* Operating voltage range: 1.8V ~ 5V
* Inverts input supply voltage
* 25mA output current with a voltage drop of 250mV
* Quiescent current 0.45mA from supplis 3.3V
* Voltage conversion efficiency up to 99%
* Only two capacitors needed
* Over-temperature circuit
* 2KV ESD rating
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
UC5301L-S08-R
UC5301G-S08-R
Package
SOP-8
UC5301L-S08-R
(1)Packing Type
(2)Package Type
(3)Lead Free
(1) R: Tape Reel
(2) S08: SOP-8
(3) L:Lead Free, G: Halogen Free
CMOS IC
Packing
Tape Reel
www.unisonic.com.tw
Copyright © 2013 Unisonic Technologies Co., Ltd
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UC5301
CMOS IC
APPLICATION INFORMATION
PRODUCTION METHOD
Surface-Mount Ceramic
Table 1. Low-ESR Capacitor Manufacturers
MANUFACTURER
AVX
Matsuo
SERIES
X7R
X7R
Capacitor Selection
Proper selection of external capacitor in applications is critical to keep the lowest output resistance; the capacitors
should be with low ESR (Table 1). Minimizing the charge-pump capacitor’s ESR minimizes the total output
resistance because the charge-pump output resistance is a function of C1’s and C2’s ESR.
Flying Capacitor (C1)
Increasing the flying capacitor’s value reduces the output resistance. Above a certain point, increasing C1’s
capacitance has a negligible effect because the output resistance becomes dominated by the internal switch
resistance and capacitor ESR.
Output Capacitor (C2)
Increasing the output capacitor’s value reduces the output ripple voltage. Decreasing its ESR reduces both output
resistance and ripple. Lower capacitance values can be used with light loads if higher output ripple can be tolerated.
The peak-to-peak ripple is determined by the following equations:
VRIPLE =
IL
fOSC
C2
2XIL
ESRC2
The output voltage drop is the load current times the output resistance, and the power efficiency is calculated as:
η=
POUT
PIN
IL2RL
IL2RL
IL2ROUT
IQ(VIN )
(IQ(VIN) is the quiescent power loss of the IC device, and IL2ROUT is the conversion loss associated with the switch
on-resistance, the two external capacitors and their ESRS.)
Input Bypass Capacitor (C3)
Input bypass capacitor is used to bypass the incoming supply to reduce its AC impedance and the impact of the
UTC UC5301’s switching noise. The value of a bypass capacitor is recommended to be equal to the C1.
Voltage Inverter
The device is mainly for application as a charge-pump voltage inverter (Figure 2). Less external capacitors are
required. (C1, C2 and a bypass capacitor, if necessary.)
Layout and Grounding
For a better noise performance, a good layout is necessary. Therefore, it’s best to mount all components as close
together as possible, keep traces short to minimize parasitic inductance and capacitance and use a ground plane.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet UC5301.PDF ] | |
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