LTC1624
W W U W
U
W U
ABSOLUTE MAXIMUM RATINGS
PACKAGE/ORDER INFORMATION
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
ORDER PART
TOP VIEW
NUMBER
–
SENSE
1
2
3
4
8
7
6
5
V
IN
I
TH
/RUN
BOOST
TG
LTC1624CS8
LTC1624IS8
(BOOST to SW) ....................................7.8V to –0.3V
V
FB
SENSE– Voltage
GND
SW
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
S8 PACKAGE
8-LEAD PLASTIC SO
S8 PART MARKING
1624
1624I
TJMAX = 125°C, θJA = 110°C/ W
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
Consult factory for Military grade parts.
TA = 25°C, VIN = 15V, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Main Control Loop
I
V
Feedback Current
(Note 2)
(Note 2)
10
50
nA
V
IN FB
V
Feedback Voltage
●
1.1781
1.19
0.002
1.2019
0.01
FB
∆V
∆V
Reference Voltage Line Regulation
Output Voltage Load Regulation
V
IN
= 3.6V to 20V (Note 2)
%/V
LINE REG
(Note 2)
LOAD REG
I
I
Sinking 5µA
Sourcing 5µA
●
●
0.5
–0.5
0.8
–0.8
%
%
TH
TH
V
Output Overvoltage Lockout
1.24
0.6
1.28
1.32
V
OVL
I
Input DC Supply Current
Normal Mode
(Note 3)
Q
550
16
900
30
µA
µA
Shutdown
V
= 0V
ITH/RUN
V
Run Threshold
0.8
V
ITH/RUN
I
Run Current Source
Run Pullup Current
V
V
= 0.3V
= 1V
–0.8
–50
–2.5
–160
–5.0
–350
µA
µA
ITH/RUN
ITH/RUN
ITH/RUN
∆V
Maximum Current Sense Threshold
V
FB
= 1.0V
145
160
185
mV
SENSE(MAX)
TG Transition Time
Rise Time
TG t
TG t
C
LOAD
C
LOAD
= 3000pF
= 3000pF
50
50
150
150
ns
ns
r
f
Fall Time
f
Oscillator Frequency
Boost Voltage
●
175
4.8
200
5.15
3
225
5.5
5
kHz
V
OSC
V
SW = 0V, I
SW = 0V, I
= 5mA, V = 8V
BOOST
BOOST
IN
∆V
Boost Load Regulation
= 2mA to 20mA
%
BOOST
BOOST
The
●
denotes specifications which apply over the full operating
T = T + (P • 110°C/W)
J A D
temperature range.
Note 2: The LTC1624 is tested in a feedback loop which servos V to
FB
LTC1624CS: 0°C ≤ T ≤ 70°C
the midpoint for the error amplifier (V = 1.8V).
A
ITH
LTC1624IS: –40°C ≤ T ≤ 85°C
A
Note 3: Dynamic supply current is higher due to the gate charge being
Note 1: T is calculated from the ambient temperature T and power
delivered at the switching frequency. See Applications Information.
J
A
dissipation P according to the following formula:
D
2
Linear [ Linear ]
