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Datasheet: ILC6375CP-50 (Impala Linear Corporation)

1 AMP SOT - 89 STEP DOWN PWM SWITCHER CONTROLLER

 

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Impala Linear Corporation
The ILC6375 is a high efficiency step-down DC-DC con-
troller using a PWM control scheme. The typical efficiency
can be as high as 85% to 90% at 10mA to 1 Amp load.
The ILC6375 drives an external switching transistor to
deliver up to 1 Amp of output current. The internal oscillator
operates at a fixed 100kHz frequency. Meanwhile, the
device is capable of 100% duty cycle thus allowing true low
drop-out operation to maximize battery life in portable
applications. Output voltage is trimmed to 2.5% accuracy.
The device includes internal phase compensation and soft-
start circuitry. Available in a tiny SOT-89 package, the
ILC6375 requires an external PNP switching transisitor, an
inductor, a shottky diode and capacitors.
!
Up to 1 Amp output current
!
85% to 90% efficiency at 0.5A to1A (V
IN
= 7V, V
OUT
= 5V)
!
85% efficiency at 10mA (V
IN
= 7V, V
OUT
= 5V)
!
100% Duty Cycle for ultra low drop-out
!
100kHz 15% internal oscillator
!
10V(max) input voltage
!
2.5% precision output
!
Tiny SOT-89 package
!
Cellular Phones
!
Palmtop PCs and PDAs
!
Portable instrumentation
!
Digital cameras
!
High efficiency 5V to 3.3V converter
P WM Co ntrol led
BUFFE R
V
DD
EXT
+
-
OSC
100kHz
V
OUT
P WM comp
V
re f
Slow Start
V
I N
V
I N
SD
+
V
OUT
1
3
2
4
5
ILC6375
C
L
GND
L
Tr
R
B
C
I N +
( 10V )
5V/1A
SOT -89-5
(TOP V IEW)
1
3
2
V
IN
V
O UT
EXT
4
5
GN D
N/C
ILC6375
Ordering Information*
ILC6375CP-33
3.3V+2.5% @100kHz external xtor
ILC6375CP-50
5.5V+2.5% @100kHz external xtor
* Standard product offering comes in tape & reel, quantity
1000 per reel, orientation right for SOT-89
ILC6375
1 Amp SOT-89 Step Down PWM Switcher Controller
Impala Linear Corporation
Impala Linear Corporation
1
(408) 574-3939
www.impalalinear.com
June 1999
ILC6375 1.1
General Description
Features
Applications
Block Diagram
Typical Application
Pin Package Configuration
Parameter
Symbol
Ratings
Units
Input Voltage
V
IN
12
V
Voltage on V
OUT
pin
V
OUT
12
V
Voltage on pin EXT
V
EXT
-0.3 to V
IN
+ 0.3
V
Current on pin EXT
I
EXT
+50
mA
Continuous Total Power Dissipation
P
D
500
mW
Operating Ambient Temperature
T
A
-30 to +80
C
Storage Temperatures
T
STG
-40 to+125
C
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Output Voltage
V
OUT
4.875 5.000 5.125
V
Input Voltage
V
IN
10
V
Supply Current 1
I
DD
1
4.75V applied to V
OUT
with no
external components
25
42
A
Supply Current 2
I
DD
2
5.5V applied to V
OUT
with no
external components
20
34
A
EXT "High" ON Resistance
R
EXTH
5.5V applied to V
OUT
with no
external components, V
EXT
=4.6V
38
63
EXT "Low" ON Resistance
R
EXTL
4.75V applied to V
OUT
with no
external components, V
EXT
=0.4V
30
50
Oscillator Frequency
F
OSC
Measure Frequency at EXT pin
85
100
115
kHz
Maximum Duty Ratio
MAXDTY Measure Duty Cycle at EXT pin
100
%
Efficiency
EFFI
90
%
Soft-Start Time
T
SS
10
ms
V
OUT
= 5.0V F
OSC
= 100kHz T
A
= 25
o
C, unless otherwise specified, V
IN
= 6V, I
OUT
= 100mA, See test circuit, figure 1.
1 Amp SOT-89 Step Down PWM Switcher Controller
Impala Linear Corporation
2
(408) 574-3939
www.impalalinear.com
June 1999
ILC6375 1.1
Absolute Maximum Ratings (T
A
= 25

C)
Electrical Characteristics ILC6375CP-50
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Output Voltage
V
OUT
3.218 3.300 3.383
V
Input Voltage
V
IN
10
V
Supply Current 1
I
DD
1
3V applied to V
OUT
with no
external components
20
33
A
Supply Current 2
I
DD
2
3.6V applied to V
OUT
with no
external components
16
27
A
EXT "High" ON Resistance
R
EXTH
3.6V applied to V
OUT
with no
external components,V
EXT
= 3.6V
57
95
EXT "Low" ON Resistance
R
EXTL
3V applied to V
OUT
with no
external components, V
EXT
= 0.4V
46
76
Oscillator Frequency
F
OSC
Measure Frequency at EXT pin
85
100
115
kHz
Maximum Duty Ratio
MAXDTY Measure Duty Cycle at EXT pin
100
%
Efficiency
EFFI
90
%
Soft Start Time
T
SS
10
ms
V
OUT
= 3.3V F
OSC
= 100kHz T
A
= 25
o
C,unless otherwise specified, V
IN
= 4V, I
OUT
= 55mA, See test circuit, figure 1.
V
I N
SD
+
V
OU T
1
3
2
4
5
ILC6375
C
L
GND
L
Tr
R
B
C
I N +
( 5V )
( 5V to 10V )
Figure 1: ILC6375 Typical Application
L:
100mH (SUMIDA CD-54)
SD:
Shottkey Diode (MATSUSHITA MA735
C
IN
:
10mF/16V Tantalum Capacitor (NICHICON F93)
C
L
:
47mF/10V Tantalum Capacitor (NICHICON F93)
Tr:
PNP Transistor (TOSHIBA 2SA1213)
R
B
1k
1 Amp SOT-89 Step Down PWM Switcher Controller
Impala Linear Corporation
3
(408) 574-3939
www.impalalinear.com
June 1999
ILC6375 1.1
Electrical Characteristics ILC6375CP-33
Applications Circuits
OUTPUT CUR RENT I
O UT
(mA)
0
O
U
TP
U
T
V
O
LT
A
G
E V
OU
T
(V
)
1
10
8.0V
5.0
4.6
4.4
4. 2
100
1000
10.0V
V
I N
=5.0V
7.0V
5.2
4.8
OUTPUT CURRENT I
O UT
(mA)
0
O
U
T
P
UT
VO
L
T
A
G
E
V
OU
T
(V
)
1
10
4.8
4.4
4.2
4.0
100
1000
V
I N
=5.0V
5.1V
5.2
4.6
4.0
5.0
V
IN
=
ILC6375CP-50
Output Voltage vs Output Curre nt
Output Voltage vs Output C urrent
ILC6375CP-50
OUTPUT CUR RENT I
O UT
(mA)
0
E
F
F
I
CI
E
N
CY (
%

)
1
10
80
60
40
20
100
1000
100
0
Vin= 5.5V
Vin = 10.0V
Vin =7.0V
Efficiency vs Output C urrent
ILC6375CP-50
OUTPUT CURR ENT I
O UT
(mA)
0
RI
P
P
L
E
(
m
VP
-
P
)
1
10
80
60
40
20
100
1000
100
0
Vin=5.5V
Vin=7.0V
Vin=8.0V
Output Ripple Voltage vs Output Current
ILC6375CP-50
OU TPU T CURRENT I
OUT
(mA)
0
E
F
F
I
CI
E
NCY (
%
)
1
10
80
60
40
20
100
1000
100
0
Vin = 7.0V
Vin=4V
Vin =5.0V
Ef ficie ncy vs Output Curr ent
ILC6375CP-33
OU TPU T CURRENT I
OUT
(mA)
0
RI
P
P
L
E
(
m
VP
-
P
)
1
10
80
60
40
20
100
1000
100
0
Vin=4V
Vin=5.0V
Vin=7.0V
Output R ipple Volta ge vs Output C ur rent
ILC6375CP-33
L = 100kHz C
L
= 47
F3.3V F
OSC
T
A
= 25
o
C, unless otherwise specified, V
IN
= 4V, I
OUT
= 55mA, See test circuit, figure 1.
1 Amp SOT-89 Step Down PWM Switcher Controller
Impala Linear Corporation
4
(408) 574-3939
www.impalalinear.com
June 1999
ILC6375 1.1
Electrical Characteristics ILC6375CP-33
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