1308AI Linear Technology Corporation, 1308AI Datasheet - Page 4

• Manufacturer Part Number: 1308AI
• Description: Lt1308b - Single Cell High Currentmicropower 600khz Boost Dc/dc Converter
• Manufacturer: Linear Technology Corporation

LT1308A/LT1308B
ELECTRICAL CHARACTERISTICS
range, otherwise specifications are T
SYMBOL PARAMETER
f
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT1308ACS8, LT1308ACF, LT1308BCS8 and LT1308BCF are
designed, characterized and expected to meet the industrial temperature
limits, but are not tested at – 40°C and 85°C. I grade devices are
guaranteed over the –40°C to 85°C operating temperature range.
Note 3: Bias current flows into FB pin.
TYPICAL PERFORMANCE CHARACTERISTICS
4
OSC
95
90
85
80
75
70
65
60
55
50
1
LT1308B
3.3V Output Efficiency
Switching Frequency
Maximum Duty Cycle
Switch Current Limit
Switch V
Burst Mode Operation Switch Current Limit
(LT1308A)
Shutdown Pin Current
LBI Threshold Voltage
LBO Output Low
LBO Leakage Current
LBI Input Bias Current (Note 5)
Low-Battery Detector Gain
Switch Leakage Current
LOAD CURRENT (mA)
V
10
CESAT
IN
= 1.8V
V
IN
= 1.2V
100
V
IN
= 2.5V
W
1308A/B G01
A
= 25°C. Industrial Grade – 40°C to 85°C. V
U
1000
95
90
85
80
75
70
65
60
55
50
1
CONDITIONS
Duty Cyle = 30% (Note 4)
I
I
V
V
V
V
I
V
V
V
LT1308A
3.3V Output Efficiency
SW
SW
SINK
IN
SHDN
SHDN
SHDN
LBI
LBI
SW
= 2.5V, Circuit of Figure 1
= 2A (25°C, – 40°C), V
= 2A (85°C), V
= 250mV, V
= 150mV
= 5V
= 50μA
The
V
= 1.1V
= 6V
= 0V
IN
= 1.8V
LOAD CURRENT (mA)
●
10
denotes specifications which apply over the full operating temperature
LBO
IN
V
Note 4: Switch current limit guaranteed by design and/or correlation to
static tests. Duty cycle affects current limit due to ramp generator (see
Block Diagram).
Note 5: Bias current flows out of LBI pin.
Note 6: Connect the four GND pins (Pins 4–7) together at the device.
Similarly, connect the three SW pins (Pins 8–10) together and the two V
pins (Pins 11, 12) together at the device.
= 5V
IN
= 1.5V
V
IN
= 1.2V
100
= 2.5V
IN
= 1.5V
IN
1308A/B G02
= 1.2V, V
1000
SHDN
●
●
●
●
●
●
●
●
= V
95
90
85
80
75
70
65
60
55
50
MIN
500
196
193
82
LT1308A
5V Output Efficiency
1
IN
2
, unless otherwise noted.
V
IN
= 3.6V
LOAD CURRENT (mA)
3000
10
0.01
0.01
0.01
TYP
600
290
330
400
200
200
0.1
90
20
33
3
2
V
IN
= 1.5V
100
MAX
0.25
750
350
400
204
207
100
4.5
0.1
0.1
35
10
5
V
V
IN
IN
= 4.2V
1308A/B G03
1308abfa
= 2.5V
1000
UNITS
kHz
V/V
mV
mV
mA
mV
mV
μA
μA
μA
μA
nA
μA
IN
%
A
V