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PDF ILC6363 Data sheet ( Hoja de datos )
| Número de pieza | ILC6363 | |
| Descripción | Step-Up DC-DC Converter for One-Cell Lithium-Ion Batteries | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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www.fairchildsemi.com
ILC6363
Step-Up DC-DC Converter for One-Cell Lithium-Ion
Batteries
Features
• ILC6363CIR-50: Fixed 5.0V output; custom voltages are
available upon request
• ILC6363CIR-ADJ: Adjustable output to 6V maximum
• Capable of 500mA output current
• Peak efficiency: > 90% at VOUT = 3.6V, IOUT = 300mA,
VIN = 3.6V
• No external diode is required (synchronous rectification)
• Battery input current of 300µA at no load
• True load disconnect from battery input in shutdown
(1µA)
• Oscillator frequency: 300kHz ±15%
• Low battery detector with 100ms transient rejection delay
• Power good output flag when VOUT is in regulation
• MSOP-8 package
Applications
• Cellular phones
• Palmtops, PDAs and portable electronics
• Equipment using single Lithium-Ion batteries
Description
The ILC6363 step-up/step-down DC-DC converter is a
switch mode converter, capable of supplying up to 500mA
output current, at a fixed or user selectable output voltage.
The range of input, and output voltage options makes the
ILC6363 ideal for Lithium-ion (Li-ion), or any other battery
application, where the input voltage range spans above and
below the regulated output voltage. When ILC6363’s input
Typical Circuit
voltage exceeds the output voltage by more than 800mV, the
output will begin to track the input linearly.
The ILC6363 is a direct replacement for ILC6360, in appli-
cations where SYNC pin is not used. The PFM or PWM
operating mode is user selectable through SEL pin connected
to ground or left open, respectively. The choice should be
dependent upon the current to be delivered to the load: PFM
is recommended for better efficiency at light load,while
PWM is recommended for more than 50mA load current.
In shutdown mode, the device allows true load disconnect
from battery input.
Configured as a 300kHz, fixed frequency PWM/PFM boost
converter, the ILC6363 can perform a limited buck operation
in PFM mode, when the input voltage is up to 0.8V higher
than the output voltage.
The ILC6363 is unconditionally stable with no external
compensation; the sizes of the input and output capacitors
influence input and output ripple voltages, respectively.
Since the ILC6363 has an internal synchronous rectifier, the
standard fixed voltage version requires minimal external
components: an inductor, an input capacitor, and an output
capacitor. If a tantalum output capacitor is used, then an
additional 10µF ceramic output capacitor will help reduce
output ripple voltage.
Other features include a low battery input detector with a
built-in100ms transient rejection delay and a power good
indicator useful as a system power on reset.
CIN
100µF
+
L
VIN
2.7V to 4.2V
ON
OFF
15µH
R5
R6
ILC6363CIR-XX
1 LX
2 VIN
VOUT 8
GND 7
3 LBI/SD LBO 6
4 SEL
POK 5
PWM
PFM
MSOP-8
Figure 1.
COUT
10µF 100µF
++
VOUT
Low Battery
Detector Output
Power Good Output
(Fixed VOUT only)
Optimized to Maximize Battery Life
90 4.2
80 3.6
70
Time
3.0
REV. 1.3.5 5/21/02
1 page  
PRODUCT SPECIFICATION
ILC6363
Application Information
The ILC6363 performs boost DC-DC conversion by control-
ling the switch element as shown in the simplified circuit in
Figure 3 below.
Figure 3. Basic Boost Circuit
When the switch is closed, current is built up through the
inductor. When the switch opens, this current is forced
through the diode to the output. As this on and off switching
continues, the output capacitor voltage builds up due to the
charge it is storing from the inductor current. In this way, the
output voltage is boosted relative to the input.
In general, the switching characteristic is determined by the
output voltage desired and the current required by the load.
The energy transfer is determined by the power stored in the
coil during each switching cycle.
PL = ƒ(tON, VIN)
Synchronous Rectification
The ILC6363 also uses a technique called “synchronous
rectification” which removes the need for the external diode
used in other circuits. The diode is replaced with a second
switch or in the case of the ILC6363, an FET as shown in
Figure 4 below.
VIN
LX SW2
ILC6363
VOUT
SW1
PWM/PFM
CONTROLLER
-
+
POK
GND
SHUTDOWN
CONTROL
+
VREF -
DELAY
LBO
SEL LB/SD
Figure 4. Simplified ILC6383 block diagram
The two switches now open and close in opposition to each
other, directing the flow of current to either charge the induc-
tor or to feed the load. The ILC6363 monitors the voltage on
the output capacitor to determine how much and how often
to drive the switches.
PWM Mode Operation
The ILC6363 uses a PWM or Pulse Width Modulation
technique. The switches are constantly driven at typically
300kHz. The control circuitry varies the power being
delivered to the load by varying the on-time, or duty cycle,
of the switch SW1 (see Figure 5). Since more on-time
translates to higher current build-up in the inductor, the
maximum duty cycle of the switch determines the maximum
load current that the device can support. The minimum value
of the duty cycle determines the minimum load current that
can maintain the output voltage within specified values.
There are two key advantages of the PWM type controllers.
First, because the controller automatically varies the duty
cycle of the switch's on-time in response to changing load
conditions, the PWM controller will always have an opti-
mized waveform for a steady-state load. This translates to
very good efficiency at high currents and minimal ripple on
the output. Ripple is due to the output cap constantly accept-
ing and storing the charge received from the inductor, and
delivering charge as required by the load. The “pumping”
action of the switch produces a sawtooth-shaped voltage as
seen by the output.
The other key advantage of the PWM type controllers over
pulse frequency modulated (PFM) types is that the radiated
noise due to the switching transients will always occur at
(fixed) switching frequency. Many applications do not care
much about switching noise, but certain types of applica-
tions, especially communication equipment, need to mini-
mize the high frequency interference within their system as
much as possible. Use of the PWM converter in those cases
is desirable.
PFM Mode Operation
For light loads the ILC6363 can be switched to PFM. This
technique conserves power by only switching the output if
the current drain requires it. As shown in the Figure 5, the
waveform actually skips pulses depending on the power
needed by the output. This technique is also called “pulse
skipping” because of this characteristic.
In the ILC6363, the switchover from PWM to PFM mode is
determined by the user to improve efficiency and conserve
power.
The Dual PWM/PFM mode architecture was designed spe-
cifically for applications such as wireless communications,
which need the spectral predictability of a PWM-type
DC-DC converter, yet also need the highest efficiencies
possible, especially in Standby mode.
REV. 1.3.5 5/21/02
5
5 Page 
PRODUCT SPECIFICATION
ILC6363
Typical Performance Characteristics ILC6363CIR-ADJ
Unless otherwise specified: TA = 25°C, CIN = 100µF, COUT = 100µF, L = 15µH, VOUT = 3.6V
Output Ripple Voltage vs Input Voltage
160
140 IOUT=500mA
120
100
IOUT=0mA, 10mA
80
IOUT=100mA
60
IOUT=400mA
40
20
0 IOUT=50mA
2.8 3.0 3.2
IOUT=0mA, 10mA
50mA
3.4 3.6
VIN (V)
IOUT=200mA
3.8 4.0 4.2
Ripple Current vs Input Voltage
160
IOUT=400mA IOUT=500mA
140
120
IOUT=0mA
100
IOUT=10mA
80
IOUT=100mA
60
40
20
0
2.8 3.0 3.2
IOUT=100mA
IOUT=50mA
IOUT=200mA
3.4 3.6 3.8 4.0
VIN (V)
4.2
VIN vs VOUT
4.6
4.2
3.8
IOUT=250mA
3.6
IOUT=500mA
3.4
2.8 3.4 4.0
4.6
VIN (V)
5.2
Line Transient Response
3.8
2.8
+50
0
-50
500µs/div
PWM Mode Load Switching Waveform
PFM Mode Load Switching Waveform
1µs/div
REV. 1.3.5 5/21/02
250µs/div
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet ILC6363.PDF ] | |
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