LTC3770 Datasheet, PDF (4/24 Pages) Linear Technology – Synchronous Controller with Margining, Tracking and PLL

LTC3770
ELECTRICAL CHARACTERISTICS _{The ● denotes specifications which apply over the full operating}
temperature range, otherwise specifications are T_A = 25°C. V_IN = 15V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
Internal V_CC Regulator
V_INTVCC
Internal V_CC Voltage
∆V_LDO(LOADREG) Internal V_CC Load Regulation
Phased-Locked Loop
R_PLLIN
I_PLLFLTR
PLLIN Input Resistance
Phase Detector Output Current
Sink Capability
Source Capability
PGOOD Output
6V < V_IN < 30V
I_CC = 0mA to 20mA
f_PLLIN < f₀
f_PLLIN > f₀
● 4.7
5
5.3
V
– 0.1
±2
%
50
kΩ
–15
µA
15
µA
∆V_FBH
∆V_FBL
∆V_FB(HYS)
V_PGL
PGOOD Upper Threshold
PGOOD Lower Threshold
PGOOD Hysteresis
PGOOD Low Voltage
V_FB Rising
V_FB Falling
V_FB Returning
I_PGOOD = 5mA
7
10
13
%
–7
– 10 – 13
%
1.5
3
%
0.15
0.4
V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: T_J is calculated from the ambient temperature T_A and power
dissipation P_D as follows:
LTC3770EG: T_J = T_A + (P_D • 130°C/W)
LTC3770EUH: T_J = T_A + (P_D • 34°C/W)
Note 3: The 3770 is tested in a feedback loop that adjusts V_FB to achieve a
specified error amplifier output voltage (I_TH). For these tests, V_REFOUT =
V_REFIN.
Note 4: The LTC3770E is guaranteed to meet performance 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.
TYPICAL PERFOR A CE CHARACTERISTICS
Current Sense Threshold
vs I_TH Voltage
300
V_RNG = ^2V
200
1.4V
1V
100
0.7V
0.5V
0
–100
–200
0
0.5 1.0 1.5 2.0
I_TH VOLTAGE (V)
2.5 3.0
3770 G01
On-Time vs I_ON Current
10k
V_VON = 0V
1k
100
10
1
10
I_ON CURRENT (µA)
100
3770 G02
On-Time vs V_ON Voltage
1200 _{IION = 60µA}
1000
800
600
400
200
0
0
1
2
3
4
5
V_ON VOLTAGE (V)
3770 G03
3770f
4