LTC3855EFE#PBF Linear Technology, LTC3855EFE#PBF Datasheet - Page 4

• Manufacturer Part Number: LTC3855EFE#PBF
• Description: IC BUCK SYNC ADJ 25A DL 38TSSOP
• Manufacturer: Linear Technology
• Series: PolyPhase®r
• Type: Step-Down (Buck)r

Specifications of LTC3855EFE#PBF

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 0.6 ~ 3.3 V, 0.6 ~ 12.5 V
• Current - Output: 25A
• Frequency - Switching: 250kHz ~ 770kHz
• Voltage - Input: 4.5 ~ 38 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 38-TSSOP Exposed Pad, 38-eTSSOP, 38-HTSSOP
• Primary Input Voltage: 38V
• No. Of Outputs: 2
• Output Voltage: 12.5V
• No. Of Pins: 38
• Operating Temperature Range: -40°C To +85°C
• Msl: MSL 1 - Unlimited
• Switching Frequency Max: 770kHz
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

elecTrical characTerisTics
LTC3855
SYMBOL
TG/BG t
BG/TG t
t
INTV
V
V
V
V
V
Oscillator and Phase-Locked Loop
f
f
f
R
I
CLKOUT
CLK
CLK
PGOOD Output
V
I
V
Differential Amplifier
A
R
V
PSRR
I
V
GBW
Slew Rate
junction temperature range (E-Grade), otherwise specifications are at T

ON(MIN)
NOM
LOW
HIGH
FREQ
PGOOD
CL
INTVCC
LDO
EXTVCC
LDO
LDOHYS
PGL
PG
DA
OS
OUT(MAX)
MODE/PLLIN
IN
HIGH
LOW
CC
INT
EXT
OA
Linear Regulator
1D
2D
PARAMETER
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/PLLIN Input Resistance
Frequency Setting 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
Gain
Input Resistance
Input Offset Voltage
Power Supply Rejection Ratio
Maximum Output Current
Maximum Output Voltage
Gain Bandwidth Product
Differential Amplifier Slew Rate
CC
CC
CC
CC
Load Regulation
Switchover Voltage
Voltage Drop
Hysteresis
CC
Voltage
CONDITIONS
C
C
(Note 7)
6V < V
I
EXTV
I
V
V
V
PHASMD = GND
PHASMD = Float
PHASMD = INTV
I
V
V
Measured at DIFFP Input
V
5V < V
I
(Note 8)
(Note 8)
CC
CC
PGOOD
DIFFOUT
LOAD
LOAD
FREQ
FREQ
FREQ
PGOOD
FB
DIFFP
= 0mA to 20mA
= 20mA, V
V
V
with Respect to Set Output Voltage
FB
FB
CC
= 1.2V
= 0V
≥ 2.4V
IN
IN
= 3300pF Each Driver
= 3300pF Each Driver
= V
= 2mA
Ramping Negative
Ramping Positive
Ramping Positive
= 5V
= 300µA
< 38V
< 38V
DIFFOUT
The
EXTVCC
CC
= 1.5V, I
l
= 5V
denotes the specifications which apply over the full operating
DIFFOUT
A
= 25°C. V
= 100µA
IN
= 15V, V
RUN1,2
l
l
V
INTVCC
= 5V unless otherwise noted.
0.998
MIN
450
210
700
4.8
4.5
9
4
2
– 1.4 V
INTVCC
TYP
200
500
250
770
250
120
–10
100
0.5
4.7
0.1
30
30
90
50
10
60
90
10
80
5
5
0
1
3
3
2
– 1.1
1.002
MAX
100
550
290
850
5.2
0.2
0.3
11
±2
2
2
UNITS
MHz
V/µs
3855f
Deg
Deg
Deg
kHz
kHz
kHz
V/V
mV
mV
mV
mA
kΩ
kΩ
µA
µA
dB
ns
ns
ns
%
%
%
V
V
V
V
V
V