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PDF ACE705 Data sheet ( Hoja de datos )
| Número de pieza | ACE705 | |
| Descripción | Step-up DC/DC Controller | |
| Fabricantes | ACE Technology | |
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ACE705
High efficiency, Low supply current, step-up DC/DC Controller
Description
The ACE705 series are CMOS-based PFM step-up DC-DC Controller with low supply current and high
output voltage accuracy. Quiescent current drawn from power source is as low as 6uA. It is capable of
delivering 500mA output current at 4.0V output with 2V input Voltage. Only four external components are
necessary: An inductor, a Schottky diode, an output filter capacitor and a NMOSFET or a NPN transistor
All of these features make ACE705 series be suitable for the portable devices, which are supplied by a
single battery to four-cell batteries.
ACE705 has a drive pin (EXT) for external transistor. So it is possible to load a large output current with
a power transistor which has a low saturation voltage.
ACE705 integrates stable reference circuits and trimming technology, so it can afford high precision and
low temperature-drift coefficient of the output voltage.
ACE705 is available in SOT-23-3 and SOT-23-5 packages which are PB free. And in SOT-23-5 the
device can be switch on or off easily by CE pin, to minimize the standby supply current.
Features
Deliver 500mA at 4.0V Output voltage with 2.0V input Voltage
The converter output voltage can be adjusted from 2.5V～6.0V(In 0.1V step)
Output voltage accuracy 2％
Low temperature-drift coefficient of the output voltage 100ppm/℃
Only four external components are necessary: An inductor, a Schottky diode an output filter
capacitor and a NMOSFET or a NPN transistor
High power conversion efficiency 90％
Low quiescent current drawn from power source 6uA
Application
Power source for PDA. DSC. MP3 Player. electronic toy and wireless mouse
Power source for a single or dual-cell battery-powered equipments
Power source for LED
Absolute Maximum Ratings
Parameter
Symbol Max Unit
Input voltage range
-0.3~12 V
Input voltage
V(EXT) -0.3~Vout+0.3 V
CE pin voltage
-0.3~Vout+0.3 V
EXT pin output current
Maximum power dissipation, Pd T=25℃
SOT-23-5
SOT-23-3
Operating junction temperature
0.7 A
250 mW
250
125 ℃
Ambient Temperature
-40~85 ℃
Storage temperature range
-40~150 ℃
VER 1.4 1
1 page  
ACE705
High efficiency, Low supply current, step-up DC/DC Controller
Typical Application
(1) Application with external NMOSFET
Vin
L 27uH
Cin
47uF
D 1N5817
EXT OUT
ACE705
CE GND
OFF ON
Cp
1nF
Vout
Cout
Rload
100uF Tan
Figure 1
(2) Application with external NPN transistor
ACE705
Figure 2
Note: R1=330Ω, C1=10nF. (R1 can be calculated by load. If load is light R1’s value can be added. If load is heavy R1’s value can
be smaller. )
Detailed Description
The ACE705 series are boost structure, voltage-type pulse-frequency modulation(PFM) step-up DC-DC
controller. Only four external components are necessary: an inductor, a schottky diode, an output filter
capacitor and a NMOSFET or a NPN transistor. The step-up DC-DC converter, constructed by ACE705,
can be adjusted from 2.5V to 6.0V, 0.1V step. By using the depletion technics, the quiescent current
drawn from power source is lower than 8uA. The high efficiency device consists of resistors for output
voltage detection and trimming, a start-up voltage circuit, an oscillator, a reference circuit, a PFM control
circuit, a switch protection circuit and a driver transistor.
ACE705 integrates PFM control system. This system controls fixed power switch on duty cycle
frequency to stabilize output voltage by calculating results of other blocks which sense input voltage,
output voltage, output current and load conditions. In PFM modulation system, the frequency and pulse
width is fixed. The duty cycle is adjusted by skipping pulses, so that switch on-time is changed based on
the conditions such as input voltage, output current and load. The oscillate block inside ACE705 provides
fixed frequency and pulse width wave.
VER 1.4 5
5 Page 
ACE705
High efficiency, Low supply current, step-up DC/DC Controller
Typical Characteristic
(Recommended operating conditions: L=10uH, Cin=47uF, Cout=100uF, Cp=1nF, Topt=25℃, unless otherwise noted)
1.Output Voltage VS. Output Current
2.Output Voltage VS. Output Current
ACE705230BN+ Output Voltage VS. Output Current
ACE705260BN+ Output Voltage VS. Output Current
Iout (mA)
3. Efficiency VS. Output Current
ACE705230BN+ Efficiency VS. Output Current
Iout (mA)
4.Efficiency VS. Output Current
ACE705260BN+ Efficiency VS. Output Current
Iout (mA)
7. Ripple VS. Output Current
ACE705230BN+ Ripple VS. Output Current
Iout (mA)
8.Ripple VS. Output Current
ACE705260BN+ Ripple VS. Output Current
Iout (mA)
Iout (mA)
VER 1.4 11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet ACE705.PDF ] | |
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