LTC1624 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC1624' PDF : 28 Pages View PDF
LTC1624
ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage (VIN)......................... 36V to – 0.3V
Topside Driver Supply Voltage (BOOST)....42V to – 0.3V
Switch Voltage (SW).................................. 36V to – 0.6V
Differential Boost Voltage
(BOOST to SW) ....................................7.8V to – 0.3V
SENSE – Voltage
VIN < 15V .................................. (VIN + 0.3V) to – 0.3V
VIN ≥ 15V .......................... (VIN +0.3V) to (VIN – 15V)
ITH/RUN, VFB Voltages ............................ 2.7V to – 0.3V
Peak Driver Output Current < 10µs (TG) .................... 2A
Operating Temperature Range
LTC1624CS ............................................ 0°C to 70°C
LTC1624IS ......................................... – 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
SENSE– 1
ITH/RUN 2
VFB 3
GND 4
TOP VIEW
8 VIN
7 BOOST
6 TG
5 SW
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 110°C/ W
Consult factory for Military grade parts.
ORDER PART
NUMBER
LTC1624CS8
LTC1624IS8
S8 PART MARKING
1624
1624I
ELECTRICAL CHARACTERISTICS TA = 25°C, VIN = 15V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
Main Control Loop
IIN VFB
VFB
∆VLINE REG
∆VLOAD REG
Feedback Current
Feedback Voltage
Reference Voltage Line Regulation
Output Voltage Load Regulation
VOVL
Output Overvoltage Lockout
IQ
Input DC Supply Current
Normal Mode
Shutdown
VITH/RUN
IITH/RUN
Run Threshold
Run Current Source
Run Pullup Current
∆VSENSE(MAX)
TG tr
TG tf
fOSC
VBOOST
∆VBOOST
Maximum Current Sense Threshold
TG Transition Time
Rise Time
Fall Time
Oscillator Frequency
Boost Voltage
Boost Load Regulation
(Note 2)
(Note 2)
VIN = 3.6V to 20V (Note 2)
(Note 2)
ITH Sinking 5µA
ITH Sourcing 5µA
(Note 3)
VITH/RUN = 0V
VITH/RUN = 0.3V
VITH/RUN = 1V
VFB = 1.0V
CLOAD = 3000pF
CLOAD = 3000pF
SW = 0V, IBOOST = 5mA, VIN = 8V
SW = 0V, IBOOST = 2mA to 20mA
10
50
nA
q 1.1781 1.19 1.2019
V
0.002 0.01
%/ V
q
0.5
0.8
%
q
– 0.5 – 0.8
%
1.24 1.28 1.32
V
550 900
µA
16
30
µA
0.6
0.8
V
– 0.8 – 2.5 – 5.0
µA
– 50 –160 – 350
µA
145
160
185
mV
50
150
ns
50
150
ns
q
175
200
225
kHz
4.8 5.15 5.5
V
3
5
%
The q denotes specifications which apply over the full operating
temperature range.
LTC1624CS: 0°C ≤ TA ≤ 70°C
LTC1624IS: – 40°C ≤ TA ≤ 85°C
Note 1: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
TJ = TA + (PD • 110°C/W)
Note 2: The LTC1624 is tested in a feedback loop which servos VFB to
the midpoint for the error amplifier (VITH = 1.8V).
Note 3: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
2
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