Impala Linear Corporation
ILC6380/81
SOT-89 Step-up Dual-Mode Switcher with Shutdown
General 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 auto-
matically switches into a power-saving PFM switching tech-
nique. 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 com-
pensation and soft-start design.
ILC6381 drives an external transistor for higher current switch-
er design, with all of the features and benefits of the ILC6380.
Package 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 I
q
!
External transistor option allows several hundred
milliamp switcher design
Applications
!
Cellular Phones, Pagers
!
Portable Cameras and Video Recorders
!
Palmtops and PDAs
Block Diagram
Ordering Information
L
X
V
L X
LIMI TER
BUFFER
Slow Start
V
DD
V
OUT
V
SS
PWM/ PFM Controll ed
OSC
V
r e f
Phase com p
EXT
CE
50/ 100/180KHz
-
CHI P ENABLE
+
V
DD
is i nternall y connected to the V
O
UT
pi n.
Pin Package Configurations
V
SS
5
L
X
4
V
S S
5
EXT
4
SOT -89-5
(TOP VI EW)
1
2
3
SOT -89-5
(TOP VI EW)
1
2
3
ILC6380CP-25
ILC6380CP-33
ILC6380CP-50
ILC6380CP-25
ILC6380CP-33
ILC6380CP-50
ILC6380CP-25
ILC6380CP-33
ILC6380CP-50
ILC6381CP-25
ILC6381CP-33
ILC6381CP-50
ILC6381BP-25
ILC6381BP-33
ILC6381BP-50
ILC6381AP-25
ILC6381AP-33
ILC6381AP-50
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
N/C V
O UT
CE
N/C
V
O UT
CE
*
Standard product offering comes in tape & reel, quantity
1000 per reel, orientation right for SOT-89
Impala Linear Corporation
ILC6380/1 1.4
(408) 574-3939
www.impalalinear.com
Sept 1999
1
IMPALA [ Impala Linear Corporation ]
