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www.fairchildsemi.com
ILC6380/81
SOT-89 Step-up Dual-Mode Switcher with Shutdown
Features
85% efficiency at 50mA
Start-up voltages as low as 900mV
±2.5% accurate outputs
Complete switcher design with only 3 external
components
• 50, 100 and 180kHz switching frequency versions
available
• Shutdown to 0.5µA Iq
• External transistor option allows several hundred
milliamp switcher design
•
•
•
•
Description
100mA boost converter in 5-lead SOT-89 package using both
PFM and PWM conversion techniques. In normal operation
the ILC6380 runs in PWM mode running at one of three fixed
frequencies. At light loads the ILC6380 senses when the duty
cycle drops to approximately 10%, and automatically
switches into a power-saving PFM switching technique. This
maintains high efficiencies both at full load and in system
sleep conditions.
Only 3 external components are needed to complete the
switcher design, and standard voltage options of 2.5, 3.3, and
5.0V at ±2.5% accuracy feature on-chip phase compensation
and soft-start design.
ILC6381 drives an external transistor for higher current
switcher design, with all of the features and benefits of the
ILC6380.
Applications
• Cellular Phones, Pagers
• Portable Cameras and Video Recorders
• Palmtops and PDAs
Typical Applications
CE
V
OUT
L
V
IN
+
CE
SD
V
OUT
L
3
2
1
SD
3
2
1
ILC6380
V
IN
4
5
C
L
Tr
C
B
4
ILC6381
5
+
C
L
R
B
GND
GND
Figure 1:
L: 100µH (SUMIDA, CD-54)
SD: Diode (Schottky diode; MATSUSHITA MA735)
CL: 16V 47µF (Tantalum Capacitor; NICHICON, F93)
Figure 2:
L: 47µH (SUMIDA, CD-54)
SD: Diode (Schottky diode; MATSUSHITA MA735)
CL: 16V 47µF (Tantalum Capacitor; NICHICON, F93)
RB: 1kW
CB: 3300pF
Tr: 2SC3279, 2SDI628G
Rev. 1.5
©2001 Fairchild Semiconductor Corporation
ILC6380/81
Pin Assignments
V
SS
5
L
X
4
V
SS
5
EXT
4
SOT -89-5
(TOP VIEW)
1
2
3
SOT -89-5
(TOP VIEW)
1
2
3
N/C
V
OUT
CE
N/C
V
OUT
CE
ILC6380
ILC6381
Internal Block Diagram
L
X
V
LX
LIMITER
BUFFER
Slow Start
V
DD
V
OUT
V
SS
PWM/PFM Controlled
OSC
50/100/180KHz
V
ref
Phase com
EXT
CE
-
CHIP ENABLE
+
V
DD
is internally connected to the V
OUT
pin.
Absolute Maximum Ratings
Parameter
V
OUT
Input Voltage
Voltage on pin L
X
Current on pin L
X
Voltage on pin EXT
Current on pin EXT
CE Input Voltage
Continuous Total Power Dissipation
Operating Ambient Temperature
Storage Temperature
(T
A
= 25°C)
Symbol
V
OUT
V
LX
I
LX
V
EXT
I
EXT
V
CE
P
D
T
OPR
T
STG
Ratings
12
12
400
V
SS
-0.3~V
OUT
+0.3
±50
12
500
-30~+80
-40~+125
Units
V
V
mA
V
mA
V
mW
°C
°C
Electrical Characteristics
V
OUT
= 5.0V, F
OSC
= 100kHz T
A
- 25°C. Unless otherwise specified, V
IN
= V
OUT
x 0.6, I
OUT
= 50mA. See schematic, figure 3.
Parameter
Output Voltage
Input Voltage
Oscillation Startup
Voltage
Operation Startup
Voltage
No-Load Input Current
Supply Current 1
(Note 2)
Supply Current 2
©2001 Fairchild Semiconductor Corporation
Symbol
V
OUT
V
IN
V
ST
V
ST1
I
IN
I
DD
1
I
DD
2
Conditions
Min.
4.875
Typ.
5.000
L
X
= 10k
Ω
pull-up to 5V, V
OUT
= V
ST
I
OUT
= 1mA
I
OUT
= 0mA (Note 1)
L
X
= 10k
Ω
pull-up to 5V, V
OUT
= 4.5V
L
X
= 10k
Ω
pull-up to 5V, V
OUT
= 5.5V
23.0
78.6
6.9
Max.
5.125
10
0.8
0.9
46.0
131.1
13.8
Units
V
V
V
V
µA
µA
µA
2
ILC6380/81
Electrical Characteristics (continued)
Parameter
L
X
Switch-On Resistance
L
X
Leakage Current
Oscillator Freq.
Maximum Duty Ration
PFM Duty Ration
Stand-by Current
CE “High” Voltage
CE “Low” Voltage
CE “High” Current
CE “Low” Current
L
X
Limit Voltage
Efficiency
Slow Start Time
Symbol
R
SWON
I
LXL
F
OSC
MAXDTY
PFMDTY
I
STB
V
CEH
V
CEL
I
CEH
I
CEL
V
LXLMT
EFFI
T
SS
Conditions
L
X
= 10k
Ω
pull-up to 5V, V
OUT
= 4.5V
No external components, V
OUT
= VL
X
=
10V
L
X
= 10k
Ω
pull-up to 5V, V
OUT
= 4.5V,
Measuring of L
X
waveform
L
X
= 10k
Ω
pull-up to 5V, V
OUT
= 4.5V,
Measuring of L
X
on-time
V
IN
= 4.75V, Measuring of L
X
on-time
L
X
= 10k
Ω
pull-up to 5V, V
OUT
= 4.5V
L
X
= 10k
Ω
pull-up to 5V, V
OUT
= 4.5V,
Existence of L
X
Oscillation
L
X
= 10k
Ω
pull-up to 5V, V
OUT
= 4.5V,
Stopped L
X
Oscillation
L
X
= 10k
Ω
pull-up to 5V, V
OUT
= V
CE
=
4.5V
L
X
= 10k
Ω
pull-up to 5V, V
OUT
= 4.5V,
V
CE
= 0V
L
X
= 10k
Ω
pull-up to 5V, V
OUT
= 4.5V,
F
OSC
> F
OSC
x 2 (Note 2)
Min.
Typ.
1.3
Max.
2.3
1.0
115
92
20
0.5
Units
Ω
µA
kHz
%
%
µA
V
V
µA
µA
V
%
msec
85
80
5
0.75
100
87
10
0.20
0.25
-0.25
0.7
85
10
1.1
Notes:
1. The Schottky diode (S.D.), in figure 3 must be type MA735, with Reverse current (IR) < 1.0µA at reverse voltage (VR)=10.0V
2. “Supply Current 1” is the supply current while the oscillator is continuously oscillating. In actual operation the oscillator
periodically operates which results in less average power consumption.
The current that is actually provided by external V
IN
source is represented by “No-Load Input Current (I
IN
)”
3. Switching frequency is determined by delay time of internal comparator to turn L
X
“off”, and minimum “on” time as determined
by MAXDTY spec.
Electrical Characteristics ILC6380BP-50
V
OUT
= 5.0V, F
OSC
= 100kHz T
A
= 25°C. Unless otherwise specified, V
IN
= V
OUT
X0.6, I
OUT
= 50mA. See the schematic, figure 4.
Parameter
Output Voltage
Input Voltage
Oscillation Startup
Voltage
Operation Startup
Voltage
Supply Current 1
(Note 1)
Supply Current 2
EXT “High” On-
Resistance
Symbol
V
OUT
V
IN
V
ST2
V
ST1
I
DD
1
I
DD
2
R
EXTH
V
OUT
= V
ST2
I
OUT
= 1mA
Conditions
Test Circuit Figure 2
Min.
4.875
Typ.
5.000
Max.
5.125
10
0.8
0.9
Units
V
V
V
V
µA
µA
Ω
EXT = 10k
Ω
pull-up 5V,
V
OUT
= 4.5V
EXT = 10k
Ω
pull-up 5V,
V
OUT
= 5.5V
EXT = 10k
Ω
pull-up to 5V,
V
OUT
= 4.5V, V
EXT
= V
OUT
- 0.4V
78.6
6.9
30
131.1
13.8
50
©2001 Fairchild Semiconductor Corporation
3
ILC6380/81
Electrical Characteristics ILC6380BP-50 (continued)
Parameter
EXT “Low” On-
Resistance
Oscillator Frequency
Symbol
R
EXTL
F
OSC
Conditions
EXT = 10k
Ω
pull-up to 5V,
V
OUT
= 4.5V, V
EXT
= V
OUT
- 0.4V
EXT = 10k
Ω
pull-up to 5V,
V
OUT
= 4.5V, Measuring of EXT
waveform
85
Min.
Typ.
30
100
Max.
50
115
Units
Ω
kHz
Maximum Duty Ratio
MAXDTY EXT = 10k
Ω
pull-up to 5V,
V
OUT
= 4.5V, Measuring of EXT high
state
V
CEH
V
CEL
I
CEH
I
CEL
EFFI
T
SS
EXT = 10k
Ω
pull-up to 5V,
V
OUT
= 4.5V, Existence of Oscillation
EXT = 10k
Ω
pull-up to 5V,
V
OUT
= 4.5V, Stopped EXT Oscillation
EXT = 10k
Ω
pull-up to 5V,
V
OUT
= 4.5V, V
CE
= V
OUT
x 0.95V
EXT = 10k
Ω
pull-up to 5V,
V
OUT
= 4.5V, V
CE
= 0V
80
87
92
%
CE “High” Voltage
CE “Low” Voltage
CE “High” Current
CE “Low” Current
Efficiency
Slow Start Time
Notes:
0.75
0.20
0.25
-0.25
85
10
V
V
µA
µA
%
msec
1. The Schottky diode (S.D.), in figure 3 must be type MA735, with Reverse current (IR) < 1.0µA at reverse voltage
(VR)=10.0V
2. “Supply Current 1” is the supply current while the oscillator is continuously oscillating. In actual operation the oscillator
periodically operates which results in less average power consumption.
The current that is actually provided by external V
IN
source is represented by “No-Load Input Current (I
IN
)”
©2001 Fairchild Semiconductor Corporation
4
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