Final
Impala Linear Corporation
ILC6380/1
SOT-89 Step-up Dual-Mode Switcher with Shutdown
General Description
100 mA boost convertor in 5-lead SOT-89 package
using both PFM and PWM conversion techniques. In
normal operation the ILC6380 runs in PWM mode run-
ning 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 main-
tains 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 cur-
rent switcher design, with all of the features and bene-
fits of the ILC6380
Features
u
u
u
u
u
u
u
July 1996
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
Applications
u
u
u
Cellular Phones, Pagers
Portable Cameras and Video Recorders
Palmtops and PDAs
Ordering Information*
Block Diagram
ILC6380CP-25
ILC6380CP-33
L
X
V
LX
LIMITER
BUFFER
Slow Start
2.5V±2.5%@50kHz
3.3V±2.5%@50kHz
5.0V±2.5%@50kHz
2.5V±2.5%@100kHz
3.3V±2.5%@100kHz
5.0V±2.5%@100kHz
2.5V±2.5%@180kHz
3.3V±2.5%@180kHz
5.0V±2.5%@180kHz
2.5V±2.5%@50kHz, external xtor
3.3V±2.5%@50kHz, external xtor
5.0V±2.5%@50kHz, external xtor
2.5V±2.5%@100kHz, external xtor
3.3V±2.5%@100kHz, external xtor
5.0V±2.5%@100kHz, external xtor
2.5V±2.5%@180kHz, external xtor
3.3V±2.5%@180kHz, external xtor
5.0V±2.5%@180kHz, external xtor
V
DD
V
OUT
ILC6380CP-50
ILC6380BP-25
ILC6380BP-33
ILC6380BP-50
ILC6380AP-25
ILC6380AP-33
ILC6380AP-50
ILC6381CP-25
ILC6381CP-33
ILC6381CP-50
V
SS
PWM/PFM Controlled
OSC
50/100/180KHz
V
ref
Phase comp
EXT
CE
-
CHIP ENABLE
+
V
DD
is internally connected to the V
OUT
pin.
Pin-Package Configurations
V
SS
5
L
X
4
V
SS
5
EXT
4
ILC6381BP-25
ILC6381BP-33
ILC6381BP-50
ILC6381AP-25
ILC6381AP-33
ILC6381AP-50
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
Impala Linear Corporation
* Standard product offering comes in tape & reel, quantity 1000
per reel, orientation right for SOT-89.
1
IMPALA [ Impala Linear Corporation ]
