LTC3892_15 Datasheet, PDF (4/36 Pages) Linear Technology – 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller

LTC3892/LTC3892-1
Electrical Characteristics The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T_A = 25°C (Note 2). V_IN = 12V, V_RUN1,2 = 5V, V_EXTVCC = 0V, V_DRVSET = 0V,
VPRG1 = FLOAT unless otherwise noted.
SYMBOL
V_IN
V_FB1
V_FB2
I_FB2
I_FB1
V_REFLNREG
V_LOADREG
g_m1,2
I_Q
UVLO
V_OVL1,2
I_SENSE1,2+
I_SENSE1,2–
DF_MAX(TG)
I_TRACK/SS1,2
PARAMETER
CONDITIONS
Input Supply Operating Voltage Range
Channel 1 Regulated Feedback Voltage
Channel 2 Regulated Feedback Voltage
(Note 4) ITH1 Voltage = 1.2V
0°C to 85°C, VPRG1 = FLOAT (LTC3892) or LTC3892-1
VPRG1 = FLOAT (LTC3892) or LTC3892-1 l
VPRG1 = 0V (LTC3892) or LTC3892-1
l
VPRG1 = INTV_CC (LTC3892) or LTC3892-1) l
(Note 4) ITH2 Voltage = 1.2V
0°C to 85°C
l
Channel 2 Feedback Current
(Note 4)
Channel 1 Feedback Current
(Note 4)
VPRG1 = FLOAT (LTC3892) or LTC3892-1
VPRG1 = 0V (LTC3892 Only)
VPRG1 = INTV_CC (LTC3892 Only)
Reference Voltage Line Regulation
(Note 4) V_IN = 4.5V to 60V
Output Voltage Load Regulation
(Note 4) Measured in Servo Loop,
l
∆ITH Voltage = 1.2V to 0.7V
(Note 4) Measured in Servo Loop,
l
∆ITH Voltage = 1.2V to 2V
Transconductance Amplifier g_m
(Note 4) ITH1,2 = 1.2V, Sink/Source 5µA
Input DC Supply Current
(Note 5) V_DRVSET = 0V
Pulse-Skipping or Forced Continuous Mode RUN1 = 5V and RUN2 = 0V or
(One Channel On)
RUN2 = 5V and RUN1 = 0V,
V_FB1,2 = 0.83V (No Load)
Pulse-Skipping or Forced Continuous Mode RUN1,2 = 5V, V_FB1,2 = 0.83V (No Load)
(Both Channels On)
Sleep Mode (One Channel On)
Sleep Mode (Both Channels On)
Shutdown
RUN1 = 5V and RUN2 = 0V or
l
RUN2 = 5V and RUN1 = 0V,
V_FB1,2 = 0.83V (No Load)
RUN1,2 = 5V, V_FB1,2 = 0.83V (No Load)
RUN1,2 = 0V
Undervoltage Lockout
Feedback Overvoltage Protection
SENSE⁺ Pin Current
SENSE^– Pins Current
Maximum Duty Factor for TG
DRV_CC Ramping Up
DRVUV = 0V
l
DRVUV = INTV_CC
l
DRV_CC Ramping Down
DRVUV = 0V
l
DRVUV = INTV_CC
l
Measured at V_FB1,2 Relative to Regulated V_FB1,2
V_OUT1,2 < V_INTVCC – 0.5V
V_OUT1,2 > V_INTVCC + 0.5V
In Dropout, FREQ = 0V
Soft-Start Charge Current
V_TRACK/SS1,2 = 0V
MIN
4.5
0.792
0.788
3.234
4.890
0.792
0.788
3.6
6.4
7
97.5
8
TYP
0.800
0.800
3.3
5.0
0.800
0.800
–2
–0.002
4
4
0.002
0.01
–0.01
2
1.6
2.8
29
34
3.6
4.0
7.5
3.8
6.7
10
700
99
10
MAX
60
0.808
0.812
3.366
5.110
0.808
0.812
±50
±0.05
6
6
0.02
0.1
–0.1
55
55
10
4.2
7.8
4.0
7.0
13
±1
±1
12
UNITS
V
V
V
V
V
V
V
nA
µA
µA
µA
%/V
%
%
mmho
mA
mA
µA
µA
µA
V
V
V
V
%
µA
µA
µA
%
µA
38921f
4
For more information www.linear.com/LTC3892