LTC3856 LINER [Linear Technology], LTC3856 Datasheet - Page 4

• Manufacturer Part Number: LTC3856
• Description: 2-Phase Synchronous Step-Down DC/DC Controller with Diffamp
• Manufacturer: LINER [Linear Technology]

LTC3856
elecTrical characTerisTics
SYMBOL
TG1,2 t
TG1,2 t
BG1,2 t
BG1,2 t
TG/BG t
BG/TG t
t
INTV
V
V
V
V
V
Oscillator and Phase-Locked Loop
f
f
f
R
I
CLKOUT
CLKHIGH
CLKLOW
PGOOD Output
V
I
V

junction temperature range, otherwise specifications are at T
ON(MIN)
NOM
LOW
HIGH
FREQ
PGOOD
INTVCC
LDO
EXTVCC
LDO
LDOHYS
PGL
PG
MODE
CC
INT
EXT
r
f
r
f
Linear Regulator
1D
2D
PARAMETER
TG Transition Time
BG Transition Time
Top Gate Off to Bottom Gate On Delay
Synchronous Switch-On Delay Time
Bottom Gate Off to Top Gate On Delay
Top Switch-On Delay Time
Minimum On-Time
Internal V
INTV
EXTV
EXTV
EXTV
Nominal Frequency
Lowest Frequency
Highest Frequency
MODE Input Resistance
Frequency Setting Output Current
Phase (Relative to Controller 1)
Clock High Output Voltage
Clock Low Output Voltage
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Level, Either Controller
Rise Time
Fall Time
Rise Time
Fall Time
CC
CC
CC
CC
Load Regulation
Switchover Voltage
Voltage Drop
Hysteresis
CC
Voltage
CONDITIONS
(Note 6)
(Note 6)
C
C
(Note 7)
6V < V
I
EXTV
I
V
V
V
PHASMD = GND; Non Stage Shedding Mode
PHASMD = FLOAT; Non Stage Shedding Mode
PHASMD = INTV
Stage Shedding Mode
I
V
V
CC
CC
PGOOD
LOAD
LOAD
FREQ
FREQ
FREQ
PGOOD
FB
C
C
C
C
V
V
LOAD
LOAD
LOAD
LOAD
FB
FB
= 0mA to 20mA
= 20mA, V
with Respect to Set Output Voltage
CC
Ramping Negative
Ramping Positive
= 1.2V
= 0V
≥ 2.4V
IN
= 3300pF Each Driver
= 3300pF Each Driver
= 2mA
Ramping Positive
= 5V
= 3300pF
= 3300pF
= 3300pF
= 3300pF
≤ 38V
The
A
EXTVCC
= 25°C (Note 2). V
l
CC
denotes the specifications which apply over the full operating
; Non Stage Shedding Mode
= 5V
IN
= 15V, V
RUN
= 5V, unless otherwise noted.
l
MIN
450
210
700
4.8
4.5
9
4
TYP
200
500
250
770
250
120
180
–10
5.0
0.5
4.7
0.1
25
25
25
25
30
30
90
50
10
60
90
5
0
10
MAX
100
550
290
850
5.2
2.0
0.2
0.2
11
±2
UNITS
3856f
Deg
Deg
Deg
Deg
kHz
kHz
kHz
mV
mV
kΩ
µA
µA
ns
ns
ns
ns
ns
ns
ns
%
%
%
V
V
V
V
V