Impala Linear Corporation
ILC6382
1-Cell to 3-Cell Boost with True Load Disconnect,
3.3V, 5V or Adjustable Output
General Description
The ILC6382 series of step-up DC-DC converters operate
from 1-cell to 3-cell input. In shutdown mode, the device
allows true load disconnect from battery input. Designed for
wireless communications applications, the oscillator fre-
quency is set at 300kHz with no harmonics at sub 20kHz
audio band or at 455kHz IF band. Oscillator frequency is
externally synchronizable from 200kHz to 400kHz.
Internal synchronous rectification and dual PFM/PWM
mode of operation allows greater than 90% efficiency at
light and full load. The ILC6382 is capable of delivering
75mA at 3.3V output from a single cell input.The ILC6382-
XX offers 3.3V or 5V fixed output voltage while the
ILC6382-Adj allows adjustable output voltage to 6V maxi-
mum. Output voltage accuracy is +2% over specified tem-
perature range.
Additional features include power good output (POK) and an
internal low battery detector with 100s transient rejection
delay. The device will reject low battery input transients
under 100msec in duration. The ILC6382 series is available
in a space saving eight lead micro SOP (MSOP-8) package.
Features
!
0.9V to 6V input voltage
!
Guaranteed start up at 0.9V input
!
Synchronous rectification requires no external diode
!
True load disconnect from battery input in shutdown
!
Up to 75mA@3.3V and 40mA@5V from 1V input
!
Up to 375mA@3.3V and 160mA@5V from 3V input
!
Efficiency > 90% from 10mA to 150mA at V
OUT
= 5V
!1µA
battery input current in shutdown (with V
OUT
= 0V)
!
Internal Oscillator frequency : 300kHz to ±15%
!
External freq synchronization from 150kHz to 500kHz
!
ILC6382 : Fixed 3.3V or 5V output
!
ILC6382-Adj : Adjustable output to 6V maximum
!
Low battery detector with 100ms transient rejection delay
!
Powergood output flag when V
OUT
is in regulation
Applications
!
Cellular Phones, Pagers
!
Palmtops, PDAs and portable electronics
!
High efficiency 1V step up converters
Typical Circuit
C
IN
10µF
+
15µH
V
IN
1 to 3-cell
L
1
2
R5
3
ILC6382-XX
L
X
V
IN
LBI/SD
SYNC
V
OUT
GND
LBO
POK
C
IN
10µF
8
7
6
5
Low Battery
Detector Output
Power Good Output
+
10µF
C
OUT
L
1
15µH
2
R5
3
ILC6382-ADJ
L
X
V
IN
LBI/SD
SYNC
V
OUT
GND
V
OUT
V
IN
1 to 3-cell
+
8
7
6
5
+
C
OUT
10µF
V
OUT
R1
LBO
V
FB
ON
OFF
R6
4
Ext
Sync
ON
OFF
R6
4
Ext
Sync
MSOP-8
R2
MSOP-8
V
OUT
= 1.25 (1+R1/R2)
Figure 1: ILC6382
Figure 2: ILC6382-Adj
(Note: Pin 9 should be connected to ground if unused.)
Impala Linear Corporation
ILC6382 1.5
(408) 574-3939
www.impalalinear.com
Oct 1999
1
IMPALA [ Impala Linear Corporation ]
