LTC1627 Linear Technology, LTC1627 Datasheet - Page 2

• Manufacturer Part Number: LTC1627
• Description: Monolithic Synchronous Step-Down Switching Regulator
• Manufacturer: Linear Technology

(Note 1)
Input Supply Voltage ................................ – 0.3V to 10V
Driver Supply Voltage (V
I
Run/SS, V
Sync/FCB Voltage ...................................... – 0.3V to V
V
P-Channel Switch Source Current (DC) .............. 800mA
N-Channel Switch Sink Current (DC) .................. 800mA
Peak SW Sink and Source Current.......................... 1.5A
Operating Ambient Temperature Range
Junction Temperature (Note 2) ............................. 125 C
Storage Temperature Range ................. – 65 C to 150 C
Lead Temperature (Soldering, 10 sec).................. 300 C
ABSOLUTE
LTC1627
ELECTRICAL CHARACTERISTICS
SYMBOL
I
V
V
I
V
I
V
I
f
V
R
R
I
The
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: T
dissipation P
2
TH
VFB
S
RUN/SS
SYNC/FCB
OSC
LSW
DR
FB
LOADREG
RUN/SS
SYNC/FCB
UVLO
PFET
NFET
V
V
OVL
FB
Commercial ............................................ 0 C to 70 C
Industrial ........................................... – 40 C to 85 C
T
Voltage .................................................. – 0.3V to 5V
J
Voltage (V
= T
denotes specifications which apply over the full operating
J
A
is calculated from the ambient temperature T
+ (P
D
FB
PARAMETER
Feedback Current
Regulated Feedback Voltage
Reference Voltage Line Regulation
Output Voltage Load Regulation
Input DC Bias Current
Run/SS Threshold
Soft-Start Current Source
Auxiliary Feedback Threshold
Auxiliary Feedback Current
Oscillator Frequency
R
R
SW Leakage
according to the following formula:
Undervoltage Lockout
D
Output Overvoltage Lockout
DS(ON)
DS(ON)
Voltages ................................ – 0.3V to V
• 110 C/W)
Synchronized
Burst Mode Operation
Shutdown
Shutdown
IN
of P-Channel FET
of N-Channel FET
W
MAXIMUM
5V) ............................... – 5V to 0.3V
IN
W W
– V
DR
) ........... – 0.3V to 10V
RATINGS
CONDITIONS
(Note 3)
(Note 3)
V
I
I
(Note 4)
V
V
V
V
V
V
V
V
V
V
V
(V
I
V
A
TH
TH
SW
IN
IN
ITH
RUN/SS
RUN/SS
RUN/SS
SYNC/FCB
SYNC/FCB
FB
FB
IN
IN
RUN/SS
V
and power
IN
U
OVL
Sinking 2 A (Note 3)
Sourcing 2 A (Note 3)
= 2.8V to 8.5V (Note 3)
= 8.5V, V
Ramping Down from 3V
Ramping Up from 0V
= 0V
= – 100mA
= 0.8V
– V
= 0V, V
= V
DR
= 0V, 2.65V < V
= 0V, V
= 0V
= 0V
OVL
Ramping Negative
= 0V
) = 5V, I
IN
T
OUT
– V
A
= 8.5V, V
IN
= 25 C, V
IN
IN
= 3.3V, Frequency = 525kHz
FB
< 2.65V
SW
= 100mA
SYNC/FCB
IN
PACKAGE/ORDER
Consult factory for Military grade parts.
Note 3: The LTC1627 is tested in a feedback loop that servos V
balance point for the error amplifier (V
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
< 8.5V
IN
RUN/SS
= 5V unless otherwise specified.
GND
= Open
V
I
TH
FB
T
JMAX
1
2
3
4
8-LEAD PLASTIC SO
= 125 C,
S8 PACKAGE
TOP VIEW
JA
= 110 C/ W
8
7
6
5
SYNC/FCB
V
V
SW
DR
IN
ITH
0.788
0.755
INFORMATION
MIN
315
0.4
1.2
0.5
2.4
20
= 0.8V).
U
S8 PART MARKING
0.002
– 0.5
0.80
2.25
2.50
2.65
TYP
450
200
350
0.7
0.8
1.5
0.5
0.6
20
60
15
35
0.5
6
10
ORDER PART
LTC1627CS8
LTC1627IS8
W
NUMBER
1627
1627I
0.812
0.835
MAX
0.01
– 0.8
2.65
2.80
110
320
385
1000
1.0
3.3
2.5
0.7
0.8
60
35
0.8
FB
to the
UNITS
U
%/V
kHz
kHz
mV
nA
nA
%
%
V
A
A
A
A
V
A
V
A
V
V