LTC3870_15 Datasheet, PDF (3/22 Pages) Linear Technology – PolyPhase Step-Down Slave Controller for LTC3880/LTC3883 with Digital Power System Management

LTC3870
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 = 15V, V_RUN0,V_RUN1 = 3.3V, f_SYNC = 350kHz
(externally driven) unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Control Loop
II_{IISSEENNSSEE01++,}
II^{IISSEENNSSEE01––,}
V_IILIMIT
Gate Drivers
TG R_UP
TG R_DOWN
BG R_UP
BG R_DOWN
TG0, TG1
t_r
t_f
BG0, BG1
t_r
t_f
TG/BG t_1D
Current Sense + Pin Current
Current Sense − Pin Current
Maximum Current Sense threshold
(High Range)
Maximum Current Sense threshold
(Low Range)
Pull-Up On-Resistance
Pull-down On-Resistance
Pull-Up On-Resistance
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 Time
BG/TG t_2D
Bottom Gate Off to Top Gate On Delay Time
t_ON(MIN)
Minimum On-Time
INTV_CC Regulator
V_{INTVCC_VIN} Internal V_CC Voltage No Load
V_LDO INT
INTV_CC Load Regulation
V_{INTVCC_EXT} Internal V_CC Voltage No Load
V_LDO EXT
INTV_CC Load Regulation with EXTV_CC
V_EXTVCC
EXTV_CC Switchover Voltage
V_{HYS_EXTVCC} EXTV_CC HYSTERSIS
Oscillator and Phase-Locked Loop
f_SNYC
V_TH,SYNC
Oscillator SYNC Range
SYNC Input Threshold
f_NOM
I_FREQ
θ _SYNC-θ₀
Nominal Frequency
FREQ setting current
SYNC to Ch0 Phase Relationship Based on
the Falling Edge of Sync and Rising Edge of
TG0
θ _SYNC-θ₁
SYNC to Ch1 Phase Relationship Based on
the Falling Edge of Sync and Rising Edge of
TG1
V_ISENSE0,1+ = 3.3V
V_{ISENSE0,1–} = 3.3V
V_ITH = 2.22V, I_LIM = INTV_CC
V_ITH = 2.22V, I_LIM = GND
TG High
TG Low
BG High
BG Low
(Note 6)
C_LOAD = 3300pF
C_LOAD = 3300pF
(Note 6)
C_LOAD = 3300pF
C_LOAD = 3300pF
(Note 6)
C_LOAD = 3300pF Each Driver
(Note 6)
C_LOAD = 3300pF Each Driver
(Note 7)
6.0V <V_IN <60V, V_EXTVCC = 0 V
I_CC = 0mA to 50mA, V_EXTVCC = 0V
V_EXTVCC = 8.5V (Note 8)
I_CC = 0 to 20mA, V_EXTVCC = 8.5V
V_EXTVCC Ramping Positive (Note 8)
V_TH,sync Falling (Note 9)
V_TH,sync Rising
V_FREQ = 1.0V
PHASMD = 0
PHASMD = 1/3 INTV_CC
PHASMD = 2/3 INTV_CC
PHASMD = INTV_CC
PHASMD = 0
PHASMD = 1/3 INTV_CC
PHASMD = 2/3 INTV_CC
PHASMD = INTV_CC
l
±0.1
±1
µA
l
±0.1
±1
µA
l 70
75
80
mV
l 45
50
55
mV
2.5
Ω
1.5
Ω
2.4
Ω
1.1
Ω
30
ns
30
ns
30
ns
30
ns
30
ns
30
ns
90
ns
4.85
5.1
5.35
V
0.8
±2
%
4.85
5.1
5.35
V
0.5
±2
%
4.7
4.8
4.9
V
200
mV
l 100
1000
kHz
0.4
V
2.0
V
500
kHz
9
10
11
µA
180
Deg
60
Deg
120
Deg
90
Deg
0
Deg
300
Deg
240
Deg
270
Deg
3870fa
For more information www.linear.com/LTC3870
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