ILC6382 Datasheet, PDF (1/19 Pages) Impala Linear Corporation – 1-CELL TO 3-CELL BOOST WITH TRUE LOAD DISCONNECT, 3.3V, 5V OR ADJUSTABLE OUTPUT

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
L
+
V_IN
1 to 3-cell
ON
OFF
15µH
R5
R6
Ext
Sync
ILC6382-XX
1
L_X
2 ^VIN
V_OUT 8
GND ₇
3 ^{LBI/SD LBO} 6
4 ^{SYNC POK} 5
MSOP-8
+ 10µF
C_OUT
V_OUT
Low Battery
Detector Output
Power Good Output
Figure 1: ILC6382
C_IN
10µF
L
+
V_IN
1 to 3-cell
ON
OFF
15µH
R5
R6
Ext
Sync
ILC6382-ADJ
1
L_X
2 V_IN
V_OUT ⁸
GND 7
3 _{LBI/SD LBO} 6
+
C_OUT
10µF
V_OUT
R1
4 ^SYNC
V_FB 5
R2
MSOP-8
V_OUT = 1.25 (1+R1/R2)
Figure 2: ILC6382-Adj
(Note: Pin 9 should be connected to ground if unused.)
Impala Linear Corporation
ILC6382 1.5
[phone] www.impalalinear.com
Oct 1999 1