CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
NOTE:
1.
JA
is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all tests are
at the specified temperature and are pulsed tests, therefore: T
J
= T
C
= T
A
Electrical Specifications
.
V
IN
= 5V, V
OUT
= 12V, L = 10µH, I
OUT
= 0mA, R
T
= 56k, T
A
= +25°C, Unless Otherwise Specified.
DESCRIPTION
CONDITIONS
R
4
must ensure V
DD
12V
Note 2
V
EN
= 0, feedback resistors disconnected
V
EN
= 2V, Continuous operation
1.29
0 < V
FB
< 1.5V
89.5
1
92
1.4
1
180
I
LBO
= 1mA
V
LBI
= 250mV, V
LBO
= 5V
At 12V output
LX = 18V
3V < V
IN
< 6V, V
OUT
= 12V, no load
I
OUT
= 50mA to 150mA
0 < V
SS
< 0.1V
R
T
= 56k
R
T
= 56k
600
1.6
0.5
0.4
1
12
1.34
670
750
220
0.1
0.02
220
1
250
0.2
2
1.4
1.33
MIN
1.8
4.5
TYP
MAX
13.2
17
1
2
1.37
0.10
UNIT
V
V
µA
mA
V
µA
%
A
µA
mV
V
µA
m
µA
%/V
%
µA
V
kHz
V
V
PARAMETER
V
IN
V
OUT
IQ1
IQ2
V
FB
I
FB
D
MAX
I
LIM
I
EN
V
LBI
V
OL-LBO
I
LEAK-LBO
R
DS(ON)
I
LEAK-SWITCH
Input Voltage Range
Output Voltage Range
Quiescent Current - Shut-down
Quiescent Current
Feedback Voltage
Feedback Input Bias Current
Maximum Duty Cycle
Current Limit - Max Peak Input Current
Enable Input Bias Current
LBI Threshold Voltage
LBO Output Low
LBO Output Leakage Current
Switch On Resistance
Switch Leakage Current
V
OUT
/V
IN
/V
OUT
Line Regulation
V
OUT
/V
OUT
I
SS
V
RT
f
OSC1
VHI_EN
VLO_EN
NOTE:
2. Minimum V
OUT
of 4.5V is tested with V
IN
= 1.8V.
Load Regulation
Soft Start Current
Voltage at R
T
for Bias Current
Switching Frequency
EN Input High Threshold
EN Input Low Threshold
FN6654 Rev 1.00
December 8, 2010
Page 3 of 10
ISL98012
Pin Descriptions
PIN NUMBER
1
2
3
4
5
6
7
8
9
10
PIN NAME
PGND
SGND
RT
EN
LBI
LBO
SS
FB
VDD
LX
PIN FUNCTION
Power ground; connected to the source of internal N-Channel power MOSFET
Signal ground; ground reference for all the control circuitry; needs to have only a single connection to PGND
Timing resistor to adjust the oscillation frequency of the converter. Resistor value on RT pin determines
frequency. Range varies from R
T
= 49.9k for 750kHz and R
T
= 100k for 380kHz
Chip enable; connects to logic HI (>1.6V) for chip to function
Low battery input; connects to a sensing voltage, or connect to GND if function is not used
Low battery detection output; connected to the open drain of a MOSFET; able to sink 1mA current
Soft-start; connects to a capacitor to control the start-up of the converter. During start-up, V
SS
controls the
current limit and hence the in-rush current.
Voltage feedback input; needs to connect to resistor divider to decide V
O
Control circuit positive supply
Inductor drive pin; connected to the drain of internal N-Channel power MOSFET
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