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ILC6391CP-50 Datasheet

  • ILC6391CP-50

  • SOT-89 STEP-UP PFM SWITCHER WITH AUTO-LOAD SENSE

  • 9頁

  • IMPALA

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Impala Linear Corporation
ILC6390/91
SOT-89 Step-Up PFM Switcher
with Auto-Load Sense
General Description
50 mA boost converter using Pulse Frequency Modulation,
or PFM, technique, in 5-lead SOT-89 or a 5-lead SOT-23
package. Only 3 external components are needed to com-
plete the switcher design.
The ILC6390 automatically senses load variations to choose
between 55% and 75% duty cycles. Normal operation is 55%
duty at 155kHz; when load currents exceed the internal com-
parator trip point, a 鈥渢urbo mode鈥?kicks in to provide extend-
ed on-time switching (75% duty at 100kHz oscillation).
Requiring only 30碌A of supply current, the ILC6390
achieves efficiencies as high as 85% at 5V yet shuts down
to 0.5碌A max.
Standard voltages offered are 2.5, 3.3, and 5.0V and is
available in both a 5 lead SOT-23 and 5 lead SOT-89 pack-
age for small footprint applications.
In addition, the ILC6391 is configured to drive an external
transistor to achieve higher power levels.
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Features
85% conversion efficiency at 50mA out
Start-up voltages as low as 900mV
鹵2.5% accurate outputs
Complete switch design with only 3 external components
Automatically senses load variations to select the optimal
duty cycle and extend conversion efficiencyover a wide
range
鈥?External transistor configuration to run as switcher
controller
鈥?Shutdown to 0.5碌A
Applications
鈥?Cellular phones, pagers
鈥?Cameras, video recorders
鈥?Palmtops and PDAs
Block Diagram
L
X
V
LX
LIMITER
BUFFER
V
REF
V
DD
V
OUT
V
SS
2-STEP PFM
CONTROLLED OSC
100/155kHz
+
-
+
EXT
Ordering Information
4~5mV
CE
CHIP ENABLE
-
Pin-Package Configurations
L
X
5
V
SS
4
L
X
5
V
SS
4
SOT-25
(TOP VIEW)
1
CE
2
V
DD
3
N/C
SOT-25
(TOP VIEW)
1
CE
2
V
DD
3
N/C
ILC6390CM
V
SS
5
L
X
4
V
SS
5
ILC6391CM
L
X
4
ILC6390CM-25
ILC6390CM-33
ILC6390CM-50
ILC6391CM-25
ILC6391CM-33
ILC6391CM-50
ILC6390CP-25
ILC6390CP-33
ILC6390CP-50
ILC6391CP-25
ILC6391CP-33
ILC6391CP-50
2.5V 鹵 2.5%
3.3V 鹵 2.5%
5.0V 鹵 2.5%
3.3V 鹵 2.5% driving external transistor
3.3V 鹵 2.5% driving external transistor
5.0V 鹵 2.5% driving external transistor
2.5V 鹵 2.5%
3.3V 鹵 2.5%
5.0V 鹵 2.5%
3.3V 鹵 2.5% driving external transistor
3.3V 鹵 2.5% driving external transistor
5.0V 鹵 2.5% driving external transistor
* Standard product offering comes in tape & reel, quantity 3000 per
reel, orientation right for SOT-25, quantity 1000 per reel orientation
right for SOT-89.
SOT-89-5
(TOP VIEW)
1
N/C
2
V
OUT
3
CE
1
N/C
SOT-89-5
(TOP VIEW)
2
V
OUT
3
CE
ILC6390CP
ILC6391CP
Impala Linear Corporation
ILC6390 1.1
(408) 574-3939
www.impalalinear.com
Feb 2001
1

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