LTC1772BES6 LINER [Linear Technology], LTC1772BES6 Datasheet - Page 2

• Manufacturer Part Number: LTC1772BES6
• Description: Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23
• Manufacturer: LINER [Linear Technology]

ABSOLUTE
(Note 1)
Input Supply Voltage (V
SENSE
V
PGATE Peak Output Current (< 10 s) ....................... 1A
Storage Ambient Temperature Range ... – 65 C to 150 C
Operating Temperature Range (Note 2) ... –40 C to 85 C
Junction Temperature (Note 3) ............................. 150 C
Lead Temperature (Soldering, 10 sec).................. 300 C
LTC1772B
range, otherwise specifications are at T
PARAMETER
Input DC Supply Current
Undervoltage Lockout Threshold
Shutdown Threshold (at I
Start-Up Current Source
Regulated Feedback Voltage
Output Voltage Line Regulation
Output Voltage Load Regulation
V
Overvoltage Protect Threshold
Overvoltage Protect Hysteresis
Oscillator Frequency
Gate Drive Rise Time
Gate Drive Fall Time
Peak Current Sense Voltage
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC1772BE is guaranteed to meet specifications from 0 C to
70 C. Specifications over the –40 C to 85 C operating temperature range
are assured by design, characterization and correlation with statistical
process controls.
Note 3: T
dissipation P
ELECTRICAL CHARACTERISTICS
2
FB
FB
Normal Operation
Shutdown
UVLO
Input Current
, I
TH
J
–
/RUN Voltages ..............................– 0.3V to 2.4V
, PGATE Voltages ............. – 0.3V to (V
is calculated from the ambient temperature T
D
according to the following formula:
W
MAXIMUM
TH
/RUN)
IN
).........................– 0.3V to 10V
W W
A
= 25 C. V
RATINGS
A
CONDITIONS
Typicals at V
V
V
V
0 C to 70 C (Note 5)
–40 C to 85 C (Note 5)
2.4V V
I
I
(Note 5)
Measured at V
V
V
C
C
(Note 6)
and power
TH
TH
U
IN
IN
ITH
FB
FB
LOAD
LOAD
IN
2.4V V
2.4V V
V
/RUN Sinking 5 A (Note 5)
/RUN Sourcing 5 A (Note 5)
IN
Falling
Rising
= 4.2V unless otherwise specified. (Note 2)
= 0.8V
= 0V
/RUN = 0V
IN
< UVLO Threshold
= 3000pF
= 3000pF
+ 0.3V)
IN
IN
IN
The
IN
9.8V (Note 5)
FB
= 4.2V (Note 4)
9.8V, PGATE Logic High
9.8V, V
denotes specifications that apply over the full operating temperature
ITH
PACKAGE/ORDER
Consult factory for parts specified with wider operating temperature ranges.
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 5: The LTC1772B is tested in a feedback loop that servos V
output of the error amplifier.
Note 6: Peak current sense voltage is reduced dependent on duty cycle to
a percentage of value as given in Figure 2.
/RUN = 0V
T
J
I
TH
= T
/RUN 1
GND 2
A
V
T
FB
JMAX
+ (P
6-LEAD PLASTIC SOT-23
3
= 150 C,
D
S6 PACKAGE
•
TOP VIEW
JA
C/W)
JA
= 230 C/ W
6 PGATE
5 V
4 SENSE
IN
0.780
0.770
0.820
1.55
1.85
0.15
0.25
MIN
500
–
INFORMATION
U
0.800
0.800
0.860
2.00
2.10
0.35
0.05
TYP
270
550
120
105
0.5
2.5
2.5
10
20
40
40
S6 PART MARKING
8
6
ORDER PART
LTC1772BES6
NUMBER
W
0.820
0.830
0.895
MAX
2.35
2.40
0.55
0.85
LTVU
420
650
22
10
50
FB
to the
mV/ A
mV/ A
UNITS
U
mV/V
kHz
kHz
mV
mV
nA
ns
ns
A
A
A
V
V
V
A
V
V
V