LTC1626 View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC1626 Datasheet PDF : 12 Pages
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LTC1626
ABSOLUTE MAXIMUM RATINGS
(Voltages Referred to GND Pin)
Input Supply Voltage (Pins 1, 2, 13) ............– 0.3V to 7V
Shutdown Input Voltage (Pin 10) ................– 0.3V to 7V
Sense–, Sense+ (Pins 7, 8)........... – 0.3V to (VIN + 0.3V)
LBO, LBI (Pins 3, 4) .................................... – 0.3V to 7V
CT, ITH, VFB (Pins 5, 6, 9) ............. – 0.3V to (VIN + 0.3V)
DC Switch Current (Pin 14) .................................... 1.2A
Peak Switch Current (Pin 14) ................................. 1.6A
Switch Voltage (Pin 14) .......(VIN – 7.5V) to (VIN + 0.3V)
Operating Temperature Range ..................... 0°C to 70°C
Extended Commercial Operating
Temperature Range (Note 4) ............. – 40°C to 85°C
Junction Temperature (Note 1) ............................. 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
PWR VIN 1
VIN 2
LBO 3
LBI 4
CT 5
ITH 6
SENSE– 7
14 SW
13 PWR VIN
12 PGND
11 SGND
10 SHDN
9 VFB
8 SENSE+
S PACKAGE
14-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 110°C/ W
ORDER PART
NUMBER
LTC1626CS
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS TA = 25°C, VIN = 4.5V, VOUT = 2.5V, VSHDN = 0V, unless otherwise specified.
SYMBOL
IFB
VFB
PARAMETER
Feedback Pin Current
Feedback Voltage
∆VOUT
IQ
VLBTRIP
ILBI
ILBO
VSENSE
RON
tOFF
VIHSD
VILSD
IINSD
Output Voltage Line Regulation
Output Voltage Load Regulation
Burst Mode Output Ripple
Input DC Supply Current (Note 2)
Active Mode
Sleep Mode
Shutdown
Low-Battery Trip Point
Low-Battery Input Bias Current
Low-Battery Output Sink Current
Current Sense Threshold Voltage
VSENSE+ – VSENSE–
ON Resistance of Switch
Switch Off-Time (Note 3)
SHDN Pin High
SHDN Pin Low
SHDN Pin Input Current
CONDITIONS
0°C to 70°C
– 40°C to 85°C
VIN = 3.5V to 5.5V, ILOAD = 250mA
10mA ≤ ILOAD ≤ 250mA
ILOAD = 0
VSHDN = VIN
VLBO = 0.4V
VSENSE– = 2.5V, VFB = VOUT/2 + 25mV (Forced)
VSENSE– = 2.5V, VFB = VOUT/2 – 25mV (Forced)
CT = 390pF, ILOAD = 400mA
Minimum Voltage for Device to Be Shut Down
Maximum Voltage for Device to Be Active
0V ≤ VSHDN ≤ 7V
MIN TYP MAX
0.1
1
q 1.22 1.25 1.28
q 1.2
1.3
– 40
0
40
25
50
50
q
1.9
3.0
q
165
300
0.5
5
1.15 1.25 1.35
±0.5
0.4
1.4
25
130
155
180
0.32 0.45
4
5
6
VIN – 0.4
0.4
q
±1
UNITS
µA
V
V
mV
mV
mVP-P
mA
µA
µA
V
µA
mA
mV
mV
Ω
µs
V
V
µA
The q denotes specifications that apply over the specified operating
temperature range.
Note 1: TJ is calculated from the ambient temperature TA and power
dissipation according to the following formula:
TJ = TA + (PD • 110°C/W)
Note 2: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 3: In applications where RSENSE is placed at ground potential, the
off-time increases by approximately 40%.
Note 4: C grade device specifications are guaranteed over the 0°C to 70°C
temperature range. In addition, C grade device specifications are assured
over the – 40°C to 85°C temperature range by design or correlation, but
are not production tested.
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