LTC3859AL Datasheet, PDF (5/44 Pages) Linear Technology – Triple Output, Buck/Buck/Boost Synchronous Controller with 28μA Burst Mode IQ

LTC3859AL
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_BIAS = 12V, V_RUN1,2,3 = 5V, EXTV_CC = 0V unless otherwise
noted. (Note 2)
SYMBOL
PARAMETER
Gate Driver
TG1,2
Pull-Up On-Resistance
Pull-Down On-Resistance
BG1,2
Pull-Up On-Resistance
Pull-Down On-Resistance
TG3
Pull-Up On-Resistance
Pull-Down On-Resistance
BG3
Pull-Up On-Resistance
Pull-Down On-Resistance
TG1,2,3 t_r
TG1,2,3 t_f
BG1,2,3 t_r
BG1,2,3 t_f
TG/BG t_1D
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
BG/TG t_1D
Bottom Gate Off to Top Gate On Delay
Top Switch-On Delay Time
t_ON(MIN)1,2
Buck Minimum On-Time
t_ON(MIN)3
Boost Minimum On-Time
INTV_CC Linear Regulator
V_INTVCCVBIAS Internal V_CC Voltage
V_LDOVBIAS
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
f_25k
Programmable Frequency
f_65k
Programmable Frequency
f_105k
Programmable Frequency
f_LOW
Low Fixed Frequency
f_HIGH
High Fixed Frequency
f_SYNC
Synchronizable Frequency
PGOOD1 Output
V_PGL1
I_PGOOD1
V_PG1
PGOOD1 Voltage Low
PGOOD1 Leakage Current
PGOOD1 Trip Level
CONDITIONS
MIN TYP MAX UNITS
2.5
Ω
1.5
Ω
2.4
Ω
1.1
Ω
1.2
Ω
1.0
Ω
1.2
Ω
1.0
Ω
(Note 6)
C_LOAD = 3300pF
C_LOAD = 3300pF
25
ns
16
ns
(Note 6)
C_LOAD = 3300pF
C_LOAD = 3300pF
28
ns
13
ns
C_LOAD = 3300pF Each Driver Bucks (Channels 1, 2)
30
ns
Boost (Channel 3)
70
ns
C_LOAD = 3300pF Each Driver Bucks (Channels 1, 2)
30
ns
Boost (Channel 3)
70
ns
(Note 7)
95
ns
(Note 7)
120
ns
6V < V_BIAS < 38V, V_EXTVCC = 0V, I_INTVCC = 0mA
I_CC = 0mA to 50mA, V_EXTVCC = 0V
6V < V_EXTVCC < 13V, I_INTVCC = 0mA
I_CC = 0mA to 50mA, V_EXTVCC = 8.5V
EXTV_CC Ramping Positive
5.0 5.4 5.6
V
0.7
2
%
5.0 5.4 5.6
V
0.7
2
%
4.5 4.7
V
200
mV
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
115
kHz
440
kHz
835
kHz
320 350 380
kHz
485 535 585
kHz
l 75
850
kHz
I_PGOOD1 = 2mA
V_PGOOD1 = 5V
V_FB1 with Respect to Set Regulated Voltage
V_FB1 Ramping Negative
Hysteresis
V_FB1 Ramping Positive
Hysteresis
0.2 0.4
V
±1
µA
–13 –10 –7
%
2.5
%
7
10 13
%
2.5
%
3859alf
For more information www.linear.com/3859AL
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