LTC3890-2 Datasheet, PDF (4/40 Pages) Linear Technology – 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller

LTC3890-2
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified 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
Gate Driver
TG1,2 t_r
TG1,2 t_f
BG1,2 t_r
BG1,2 t_f
TG/BG t_1D
TG1,2 Pull-Up On-Resistance
TG1,2 Pull-Down On-Resistance
BG1,2 Pull-Up On-Resistance
BG1,2 Pull-Down On-Resistance
TG Transition Time:
Rise Time
Fall Time
BG Transition Time:
Rise Time
Fall Time
Top Gate Off to Bottom Gate On Delay
Synchronous Switch-On Delay Time
(Note 6)
C_LOAD = 3300pF
C_LOAD = 3300pF
(Note 6)
C_LOAD = 3300pF
C_LOAD = 3300pF
C_LOAD = 3300pF Each Driver
2.5
Ω
1.5
Ω
2.4
Ω
1.1
Ω
25
ns
16
ns
28
ns
13
ns
30
ns
BG/TG t_1D Bottom Gate Off to Top Gate On Delay
Top Switch-On Delay Time
t_ON(MIN)
Minimum On-Time
INTV_CC Linear Regulator
V_INTVCCVIN Internal V_CC Voltage
V_LDOVIN
INTV_CC Load Regulation
V_INTVCCEXT Internal V_CC Voltage
V_LDOEXT
INTV_CC Load Regulation
V_EXTVCC
EXTV_CC Switchover Voltage
V_LDOHYS EXTV_CC Hysteresis
Oscillator and Phase-Locked Loop
C_LOAD = 3300pF Each Driver
(Note 7)
6V < V_IN < 60V, V_EXTVCC = 0V
I_CC = 0mA to 50mA, V_EXTVCC = 0V
6V < V_EXTVCC < 13V
I_CC = 0mA to 50mA, V_EXTVCC = 8.5V
EXTV_CC Ramping Positive
30
ns
95
ns
4.85 5.1 5.35
V
0.7 1.1
%
4.85 5.1 5.35
V
0.6 1.1
%
4.5 4.7 4.9
V
250
mV
f_25kΩ
f_65kΩ
f_105kΩ
f_LOW
f_HIGH
f_SYNC
Programmable Frequency
Programmable Frequency
Programmable Frequency
Low Fixed Frequency
High Fixed Frequency
Synchronizable Frequency
R_FREQ = 25k, PLLIN/MODE = DC Voltage
R_FREQ = 65k, PLLIN/MODE = DC Voltage
R_FREQ = 105k, PLLIN/MODE = DC Voltage
V_FREQ = 0V, PLLIN/MODE = DC Voltage
V_FREQ = INTV_CC, PLLIN/MODE = DC Voltage
PLLIN/MODE = External Clock
105
kHz
375 440 505
kHz
835
kHz
320 350 380
kHz
485 535 585
kHz
l 75
850
kHz
38902f
4