ILC6380 Datasheet, PDF (1/6 Pages) Impala Linear Corporation – SOT-89 STEP-UP DUAL-MODE SWITCHER WITH SHUTDOWN

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
LX
VSS
EXT
CE
VL X LIMI TER
Slow Start
BU FFER
Vr ef
PWM/ PFM Controll ed
OSC
50/ 100/180KHz
Phase com p
-
CHI P ENABLE
+
V_DD
V DD is i nternall y connected to the VO UT pi n.
V_OUT
Pin Package Configurations
V_SS
L_X
5
4
SOT -89-5
(TOP VI EW)
1
2
3
N/C ^VO UT ^CE
VS S
EXT
5
4
SOT -89-5
(TOP VI EW)
1
2
3
N/C ^VO UT ^CE
Ordering Information
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
*Standard product offering comes in tape & reel, quantity
1000 per reel, orientation right for SOT-89
Impala Linear Corporation
ILC6380/1 1.4
[phone] www.impalalinear.com
Sept 1999 1