LTC1628IG Linear Technology, LTC1628IG Datasheet - Page 3

• Manufacturer Part Number: LTC1628IG
• Description: IC SW REG STEP-DOWN 28-SSOP
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LTC1628IG

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: Adj to 0.8V
• Current - Output: 3A
• Frequency - Switching: 220kHz
• Voltage - Input: 3.5 ~ 30 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -
• Other names: Q1109473

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
g
g
I
V
I
V
UVLO
V
I
V
V
DF
I
V
I
V
V
I
I
V
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
V
SYMBOL
Q
FCB
SENSE
FLTCPL
RUN/SS1, 2
SCL1, 2
SDLHO
ON(MIN)
m1, 2
mGBW1, 2
FCB
BINHIBIT
OVL
STBYMD MS
STBYMD
FLTCPL
RUN/SS1, 2
RUN/SS1, 2
SENSE(MAX)
INTVCC
LDO
LDO
LDO
EXTVCC
LDOHYS
MAX
CC
INT
EXT
EXT-PG
1D
2D
Linear Regulator
r
f
r
f
KA
ON RUN/SS Pin ON Threshold
LT RUN/SS Pin Latchoff Arming Threshold V
PARAMETER
Transconductance Amplifier g
Transconductance Amplifier GBW
Input DC Supply Current
Forced Continuous Threshold
Forced Continuous Pin Current
Burst Inhibit (Constant Frequency)
Threshold
Undervoltage Lockout
Feedback Overvoltage Lockout
Sense Pins Total Source Current
Master Shutdown Threshold
Keep-Alive Power On-Threshold
Maximum Duty Factor
V
LTC1628 Only
Fault Coupling Threshold;
LTC1628 Only
Soft-Start Charge Current
RUN/SS Discharge Current
Shutdown Latch Disable Current
Maximum Current Sense Threshold
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
Bottom Gate Off to Top Gate On Delay
Top Switch-On Delay Time
Minimum On-Time
Internal V
INTV
EXTV
EXTV
EXTV
EXTV
FLTCPL
Normal Mode
Standby
Shutdown
CC
CC
CC
CC
CC
Load Regulation
Input Current
Voltage Drop
Voltage Drop
Switchover Voltage
Hysteresis
CC
Voltage
m
CONDITIONS
I
I
(Note 4)
V
V
V
V
Measured at FCB pin
V
Measured at V
(Each Channel); V
V
V
In Dropout
0.5V > V
INTV
For FCB Signal and Individual Overcurrent
Faults to Affect Both Controllers
V
V
Soft Short Condition V
V
V
V
V
(Note 5)
C
C
(Note 5)
C
C
C
C
Tested with a Square Wave (Note 6)
6V < V
I
I
I
I
TH1, 2
TH1, 2
CC
CC
CC
CC
IN
RUN/SS1, 2
RUN/SS1, 2
FCB
IN
STBYMD
STBYMD
RUN/SS1, 2
RUN/SS1,
RUN/SS1,
RUN/SS1, 2
OSENSE1, 2
OSENSE1, 2
OSENSE1, 2
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
A
= 15V; EXTV
= 0 to 20mA, V
= 20mA, V
= 20mA, V
= 20mA, EXTV
Ramping Down
= 25 C. V
CC
= 0.85V
= 1.2V; Sink/Source 5uA; (Note 3)
= 1.2V; (Note 3)
IN
= 3300pF
= 3300pF
= 3300pF
= 3300pF
= 3300pF Each Driver
= 3300pF Each Driver
– 0.5V < V
FLTCPL
< 30V, V
Ramping Down
Ramping Up, RUN
V
V
The
RUN/SS2
RUN/SS2
= 0V, V
= 0V, V
= 4.5V
= 0.5V
= 0.7V,V
= 0.7V,V
= 1.9V
EXTVCC
EXTVCC
OSENSE1, 2
IN
CC
denotes the specifications which apply over the full operating
EXTVCC
= 15V, V
SENSE1
CC
FLTCPL
STBYMD
STBYMD
EXTVCC
Tied to V
Rising
Rising from 3V
SENSE1 – , 2 –
SENSE1 – , 2 –
Ramping Positive
= 5V, LTC1628
= 5V, LTC1628-PG
OSENSE1, 2
–
= 4V
< INTV
, 2
= 4V
> 2V
= Open;
RUN/SS1, 2
SS1, 2
– = V
OUT1
= 5V
= 5V, LTC1628 Only
CC
; V
= 0.5V;
SENSE1
= 0V
OUT1
LTC1628/LTC1628-PG
= 5V unless otherwise noted.
+
= 5V
, 2
+ = 0V
– 0.30
0.76
0.84
MIN
– 85
0.4
0.5
1.0
0.5
4.8
4.5
98
62
65
– 0.18
0.800
0.86
99.4
TYP
– 60
350
125
180
120
1.3
4.3
3.5
0.6
1.5
1.2
1.5
4.1
1.6
5.0
0.2
4.7
0.2
20
– 3
75
75
50
50
40
40
90
90
80
3
2
2
3
MAX
0.84
– 0.1
0.88
240
160
4.8
1.9
4.5
5.2
1.0
35
88
85
90
90
90
80
4
2
4
5
UNITS
mmho
1628fb
3
MHz
mV
mV
mV
mV
ns
ns
ns
ns
ns
ns
ns
%
%
A
A
A
V
A
V
V
V
A
V
V
A
A
V
A
V
V
A
A
V
V
V