LTC3890-3 Datasheet, PDF (3/40 Pages) Linear Technology – 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller

LTC3890-3
Electrical Characteristics The l denotes the specifications which apply over the full operating junction
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 12V, V_RUN1,2 = 5V, EXTV_CC = 0V unless otherwise noted. (Note 2)
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
V_IN
V_OUT
V_FB1,2
Input Supply Operating Voltage Range
Regulated Output Voltage Range
Regulated Feedback Voltage
I_TH1,2 Voltage = 1.2V (Note 4)
–40°C to 85°C, All Grades
LTC3890E-3, LTC3890I-3,
LTC3890H-3, LTC3890MP-3
4
60
V
0.8
24
V
0.792 0.800 0.808
V
l 0.788 0.800 0.812
V
l 0.786 0.800 0.812
V
I_FB1,2
Feedback Current
(Note 4)
±5
±50
nA
V_REFLNREG
V_LOADREG
Reference Voltage Line Regulation
Output Voltage Load Regulation
V_IN = 4.5V to 60V (Note 4)
(Note 4)
Measured in Servo Loop,
∆_ITH Voltage = 1.2V to 0.7V
0.002 0.02
%/V
l
0.01
0.1
%
(Note 4)
Measured in Servo Loop,
l
∆_ITH Voltage = 1.2V to 2V
g_m1,2
Transconductance Amplifier g_m
I_TH1,2 = 1.2V, Sink/Source = 5µA (Note 4)
–0.01
2
–0.1
%
mmho
I_Q
Input DC Supply Current
(Note 5)
Pulse-Skipping or Forced Continuous RUN1 = 5V and RUN2 = 0V, V_FB1 = 0.83V or
Mode (One Channel On)
RUN1 = 0V and RUN2 = 5V, V_FB2 = 0.83V
2
mA
Pulse-Skipping or Forced Continuous RUN1,2 = 5V, V_FB1,2 = 0.83V (No Load)
Mode (Both Channels On)
2
mA
Sleep Mode (One Channel On)
RUN1 = 5V and RUN2 = 0V, V_FB1 = 0.83V or
RUN1 = 0V and RUN2 = 5V, V_FB2 = 0.83V
50
75
µA
Sleep Mode (Both Channels On)
RUN1,2 = 5V, V_FB1,2 = 0.83V (No Load)
60
100
µA
Shutdown
RUN1,2 = 0V
14
25
µA
UVLO
I_SENSE+
I_SENSE–
Undervoltage Lockout
SENSE⁺ Pin Current
SENSE^– Pins Current
INTV_CC Ramping Up
INTV_CC Ramping Down
Each Channel
Each Channel
VV_{SSEENNSSEE––}
<
>
INTV_CC
INTV_CC
–
+
0.5V
0.5V
l
3.92
4.2
V
l 3.6
3.80
4.0
V
±1
µA
±1
µA
700
µA
DF_MAX
I_TRACK/SS1,2
V_RUN1 On
V_RUN2 On
V_RUN1,2 Hyst
V_SENSE(MAX)
Maximum Duty Factor
Soft-Start Charge Current
RUN1 Pin On Threshold
RUN2 Pin On Threshold
RUN Pin Hysteresis
Maximum Current Sense Threshold
In Dropout
V_TRACK1,2 = 0V
V_RUN1 Rising
V_RUN2 Rising
V_FB1,2 = 0.7V, V_SENSE1–,₂– = 3.3V, I_LIM = 0
98
99
%
0.7
1.0
1.4
µA
l 1.15 1.21
1.27
V
l 1.20 1.25
1.30
V
50
mV
l 64
75
85
mV
Gate Driver
TG1,2 Pull-Up On-Resistance
TG1,2 Pull-Down On-Resistance
2.5
Ω
1.5
Ω
BG1,2 Pull-Up On-Resistance
BG1,2 Pull-Down On-Resistance
2.4
Ω
1.1
Ω
TG1,2 t_r
TG1,2 t_f
BG1,2 t_r
BG1,2 t_f
TG Transition Time:
Rise Time
Fall Time
BG Transition Time:
Rise Time
Fall Time
(Note 6)
C_LOAD = 3300pF
C_LOAD = 3300pF
(Note 6)
C_LOAD = 3300pF
C_LOAD = 3300pF
25
ns
25
ns
25
ns
25
ns
For more information www.linear.com/3890-3
38903f
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