LTC3850EUF#PBF Linear Technology, LTC3850EUF#PBF Datasheet - Page 4

• Manufacturer Part Number: LTC3850EUF#PBF
• Description: IC CNTRLR STP DWN SYNC 28-QFN
• Manufacturer: Linear Technology
• Series: PolyPhase®r
• Type: Step-Down (Buck)r

Specifications of LTC3850EUF#PBF

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 0.8 ~ 23.3 V
• Current - Output: 100mA
• Frequency - Switching: 250kHz ~ 780kHz
• Voltage - Input: 4 ~ 24 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-QFN
• Primary Input Voltage: 24V
• No. Of Outputs: 2
• Output Current: 100mA
• No. Of Pins: 28
• Operating Temperature Range: -40°C To +85°C
• Msl: MSL 1 - Unlimited
• Supply Voltage Range: 4V To 24V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

LTC3850/LTC3850-1
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
SYMBOL
Main Control Loops
V
I
V
V
g
I
UVLO
UVLO
DF
V
I
I
V
V
V
TG R
TG R
BG R
BG R
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
4
FB1,2
Q
SENSE
TK/SS1,2
ON(MIN)
m1,2
FB1,2
REFLNREG
LOADREG
OVL
RUN1,2
RUN1,2HYS
SENSE(MAX)
INTVCC
LDO
EXTVCC
LDO
LDOHYS
MAX
UP
DOWN
CC
UP
DOWN
INT
EXT
HYS
r
f
r
f
Linear Regulator
1D
2D
PARAMETER
Regulated Feedback Voltage
Feedback Current
Reference Voltage Line Regulation
Output Voltage Load Regulation
Transconductance Amplifier g
Input DC Supply Current
Undervoltage Lockout on INTV
UVLO Hysteresis
Maximum Duty Factor
Feedback Overvoltage Lockout
Sense Pin Bias Current
Soft-Start Charge Current
RUN Pin ON Threshold
RUN Pin ON Hysteresis
Maximum Current Sense Threshold
(Note 8)
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
TG Driver Pull-Up On-Resistance
TG Driver Pulldown On-Resistance
BG Driver Pull-Up On-Resistance
BG Driver Pulldown On-Resistance
TG Transition Time:
BG Transition Time:
Rise Time
Fall Time
Normal Mode
Shutdown
Rise Time
Fall Time
CC
CC
CC
CC
Load Regulation
Switchover Voltage
Voltage Drop
Hysteresis
CC
Voltage
m
CC
CONDITIONS
I
(Note 4)
V
(Note 4)
Measured in Servo Loop; DI
Measured in Servo Loop; DI
I
(Note 5)
V
V
V
In Dropout
Measured at V
(Each Channel) V
V
V
V
V
V
TG High
TG Low
BG High
BG Low
(Note 6)
C
C
(Note 6)
C
C
C
C
(Note 7)
7V < V
I
EXTV
I
TH1,2
TH1,2
CC
CC
IN
IN
RUN1,2
INTVCC
TK/SS1,2
RUN1
FB1,2
FB1,2
FB1,2
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
A
= 0mA to 50mA
= 20mA, V
= 6V to 24V (Note 4)
= 15V; EXTV
= 25°C, V
CC
Voltage = 1.2V; (Note 4)
= 1.2V; Sink/Source 5µA; (Note 4)
, V
= 0.7V, V
= 0.7V, V
= 0.7V, V
= 3300pF
= 3300pF
= 3300pF
= 3300pF
= 3300pF Each Driver
= 3300pF Each Driver
IN
Ramping Down
Ramping Positive
= 0V
RUN2
< 24V
= 0V
The
Rising
EXTVCC
FB1,2
l
SENSE1,2
SENSE1,2
SENSE1,2
IN
CC
SENSE1,2
denotes the specifications which apply over the full operating
= 15V, V
Tied to V
= 5V
= 3.3V, I
= 3.3V, I
= 3.3V, I
= 3.3V
TH
TH
RUN1,2
OUT1
Voltage = 1.2V to 0.7V
Voltage = 1.2V to 1.6V
LIM
LIM
LIM
; V
OUT1
= 5V, unless otherwise noted.
= 0V
= Float
= INTV
= 5V
CC
l
l
l
l
l
l
l
l
l
0.792
MIN
0.84
0.9
1.1
4.8
4.5
96
20
40
60
0.800
0.002
–0.01
0.01
97.2
0.86
1.22
TYP
–10
850
200
2.2
0.5
1.3
2.6
1.5
2.4
1.1
0.5
4.7
30
±1
80
30
50
75
25
25
25
25
30
30
90
50
3
5
0.808
MAX
0.02
–0.1
0.88
1.35
–50
100
0.1
1.7
5.2
50
±2
40
60
90
2
UNITS
mmho
38501fc
%/V
mV
mV
mV
mV
mV
mV
nA
µA
µA
µA
µA
ns
ns
ns
ns
ns
ns
ns
%
%
%
%
Ω
Ω
Ω
Ω
V
V
V
V
V
V
V