ltc3770 Linear Technology Corporation, ltc3770 Datasheet - Page 4

• Manufacturer Part Number: ltc3770
• Description: Fast No Rsense Step-down Synchronous Controller With Margining, Tracking And Pll
• Manufacturer: Linear Technology Corporation

LTC3770
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are T
SYMBOL
Internal V
V
∆V
Phased-Locked Loop
R
I
PGOOD Output
∆V
∆V
∆V
V
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: T
dissipation P
Note 3: The 3770 is tested in a feedback loop that adjusts V
specified error amplifier output voltage (I
V
TYPICAL PERFOR A CE CHARACTERISTICS
4
PLLFLTR
INTVCC
PGL
REFIN
PLLIN
–100
–200
LDO(LOADREG)
FBH
FBL
FB(HYS)
300
200
100
LTC3770EG: T
LTC3770EUH: T
0
.
Current Sense Threshold
vs I
0
J
CC
is calculated from the ambient temperature T
TH
Regulator
D
0.5
Voltage
as follows:
J
PARAMETER
Internal V
Internal V
PLLIN Input Resistance
Phase Detector Output Current
PGOOD Upper Threshold
PGOOD Lower Threshold
PGOOD Hysteresis
PGOOD Low Voltage
1.0
= T
J
Sink Capability
Source Capability
I
TH
= T
A
VOLTAGE (V)
A
+ (P
+ (P
1.5
CC
CC
D
V
D
• 130°C/W)
RNG
Voltage
Load Regulation
• 34°C/W)
2.0
=
W
2.5
1.4V
1V
2V
0.7V
0.5V
TH
3770 G01
). For these tests, V
U
3.0
A
100
10k
and power
A
1k
10
= 25°C. V
FB
On-Time vs I
1
to achieve a
REFOUT
CONDITIONS
6V < V
I
f
f
V
V
V
I
CC
PLLIN
PLLIN
PGOOD
FB
FB
FB
The
= 0mA to 20mA
Rising
Falling
Returning
=
IN
< f
> f
IN
= 5mA
●
0
0
I
= 15V unless otherwise noted.
< 30V
ON
denotes specifications which apply over the full operating
ON
CURRENT (µA)
Current
10
Note 4: The LTC3770E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 5: The minimum off-time condition is specified for large peak-to-
peak inductor ripple current (see Minimum Off-Time Considerations in
the Applications Information section).
V
VON
3770 G02
= 0V
100
1200
1000
800
600
400
200
●
0
0
On-Time vs V
I
ION
MIN
4.7
– 7
7
= 60µA
1
V
– 0.1
0.15
ON
TYP
– 10
–15
1.5
50
15
10
5
ON
2
VOLTAGE (V)
Voltage
3
MAX
– 13
5.3
0.4
±2
13
3
4
UNITS
3770 G03
3770fb
kΩ
µA
µA
%
%
%
%
5
V
V