LTC1775 LINER [Linear Technology], LTC1775 Datasheet - Page 3

• Manufacturer Part Number: LTC1775
• Description: High Power No RSENSE TM Current Mode Synchronous Step-Down Switching Regulator
• Manufacturer: LINER [Linear Technology]

ELECTRICAL CHARACTERISTICS
range, otherwise specifications are at T
SYMBOL
TG t
TG t
BG t
BG t
Internal V
V
V
V
V
Oscillator
f
f
V
R
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: T
dissipation P
Note 3: The LTC1775 is tested in a feedback loop that adjusts V
achieve a specified error amplifier output voltage (I
OSC
H
INTVCC
LDOINT
LDOEXT
EXTVCC
SYNC
SYNC
/f
OSC
LTC1775CGN/LTC1775IGN: T
LTC1775CS/LTC1775IS: T
R
F
R
F
J
CC
is calculated from the ambient temperature T
Regulator
D
according to the following formula:
PARAMETER
TG Transition Time
BG Transition Time
Internal V
INTV
EXTV
EXTV
Oscillator Freqency
Maximum Synchronized Frequency Ratio
SYNC Pin Threshold (Figure 4)
SYNC Pin Input Resistance
Rise Time
Fall Time
Rise Time
Fall Time
CC
CC
CC
Load Regulation
Voltage Drop
Switchover Voltage
CC
Voltage
J
= T
J
A
= T
+ (P
A
+ (P
D
• 110 C/W)
D
A
• 130 C/W)
= 25 C. V
TH
).
A
and power
IN
CONDITIONS
(Note 6)
C
C
(Note 6)
C
C
6V < V
I
I
I
SYNC = 0V
Ramping Positive
CC
CC
CC
= 15V unless otherwise noted.
LOAD
LOAD
LOAD
LOAD
OSENSE
= 20mA, V
= 20mA, V
= 20mA, V
= 3300pF
= 3300pF
= 3300pF
= 3300pF
IN
The
< 30V, V
to
EXTVCC
EXTVCC
EXTVCC
denotes specifications which apply over the full operating temperature
EXTVCC
Note 4: Typical in application circuit with EXTV
I
to the gate charge being delivered at the switching frequency. See
Applications Information.
Note 5: Minimum input supply voltage is 4.3V at – 40 C for industrial
grade parts.
Note 6: Rise and fall times are measured at 10% to 90% levels.
OUT
= 4V
= 5V
Ramping Positive
= 4V
= 0A and FCB = INTV
CC
. Dynamic supply current is higher due
MIN
135
5.0
4.5
– 0.2
TYP
180
150
5.2
4.7
1.5
0.9
50
50
50
50
50
CC
tied to V
LTC1775
MAX
150
150
150
150
300
165
5.4
1.2
– 1
OUT
= 5V,
UNITS
3
kHz
mV
k
ns
ns
ns
ns
%
V
V
V