LTC3807_15 Datasheet, PDF (4/32 Pages) Linear Technology – Low IQ, Synchronous Step-Down Controller with 24V Output Voltage Capability

LTC3807
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_RUN = 5V, EXTV_CC = 0V unless
otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Gate Driver
TG Pull-Up On-Resistance
TG Pull-Down On-Resistance
2.5
Ω
1.5
Ω
BG Pull-Up On-Resistance
BG Pull-Down On-Resistance
2.4
Ω
1.1
Ω
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
25
ns
16
ns
25
ns
13
ns
30
ns
Bottom Gate Off to Top Gate On Delay
Top Switch-On Delay Time
C_LOAD = 3300pF
30
ns
t_ON(MIN)
Minimum On-Time
INTV_CC Linear Regulator
Internal V_CC Voltage
INTV_CC Load Regulation
Internal V_CC Voltage
INTV_CC Load Regulation
EXTV_CC Switchover Voltage
EXTV_CC Hysteresis
Oscillator and Phase-Locked Loop
(Note 7)
6V < V_IN < 38V, V_EXTVCC = 0V
I_CC = 0mA to 50mA, V_EXTVCC = 0V
6V < V_EXTVCC < 13V
I_CC = 0mA to 50mA,
V_EXTVCC = 8.5V
I_CC = 0mA to 50mA,
EXTV_CC Ramping Positive
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
Programmable Frequency
R_FREQ = 25k;
PLLIN/MODE = DC Voltage
105
kHz
Programmable Frequency
R_FREQ = 65k;
PLLIN/MODE = DC Voltage
375
440
505
kHz
Programmable Frequency
R_FREQ =105k;
PLLIN/MODE = DC Voltage
835
kHz
Low Fixed Frequency
V_FREQ = 0V;
PLLIN/MODE = DC Voltage
320
350
380
kHz
High Fixed Frequency
V_FREQ = INTV_CC;
PLLIN/MODE = DC Voltage
485
535
585
kHz
Synchronizable Frequency
PLLIN/MODE = External Clock
l 75
750
kHz
PGOOD Output
PGOOD Voltage Low
I_PGOOD = 2mA
0.2
0.4
V
3807f
4
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