LTC1628CG-PG Linear Technology, LTC1628CG-PG Datasheet - Page 4

• Manufacturer Part Number: LTC1628CG-PG
• Description: IC REG SW 2PHASE STEPDOWN 28SSOP
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LTC1628CG-PG

• 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: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

LTC1628/LTC1628-PG
ELECTRICAL CHARACTERISTICS
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: T
dissipation P
Note 3: The LTC1628/LTC1628-PG are tested in a feedback loop that
servos V
V
TYPICAL PERFOR A CE CHARACTERISTICS
4
SYMBOL
Oscillator
f
f
f
I
3.3V Linear Regulator
V
V
V
PGOOD Output (LTC1628-PG Only)
V
I
V
OSC
LOW
HIGH
FREQSET
PGOOD
OSENSE1, 2.
3.3OUT
3.3IL
3.3VL
PGL
PG
100
60
LTC1628G/LTC1628G-PG: T
LTC1628CUH: T
90
80
70
50
40
30
20
10
0
0.001
Efficiency vs Output Current
and Mode (Figure 13)
OPERATION
ITH1, 2
Burst Mode
J
is calculated from the ambient temperature T
D
according to the following formulas:
0.01
to a specified voltage and measures the resultant
PARAMETER
Oscillator frequency
Lowest Frequency
Highest Frequency
FREQSET Input Current
3.3V Regulator Output Voltage
3.3V Regulator Load Regulation
3.3V Regulator Line Regulation
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Level, Either Controller
OUTPUT CURRENT (A)
J
= T
CONSTANT
FREQUENCY
(BURST DISABLE)
A
0.1
+ (P
FORCED
CONTINUOUS
MODE
D
J
• 34 C/W)
= T
1
W
A
V
V
IN
OUT
+ (P
= 15V
1628 G01
= 5V
D
U
• 95 C/W)
10
A
100
90
80
70
60
50
and power
0.001
CONDITIONS
V
V
V
V
No Load
I
6V < V
I
V
V
3.3
PGOOD
FREQSET
FREQSET
FREQSET
FREQSET
PGOOD
OSENSE
V
V
Efficiency vs Output Current
(Figure 13)
A
V
V
OSENSE
OSENSE
= 25 C. V
= 0 to 10mA
IN
OUT
= 15V
IN
= 2mA
= 5V
= 5V
Respect to Set Output Voltage
= Open (Note 7)
= 0V
= 2.4V
= 0V
< 30V
The
0.01
Ramping Negative
Ramping Positive
V
OUTPUT CURRENT (A)
IN
IN
= 20V
V
V
IN
denotes the specifications which apply over the full operating
= 15V, V
IN
= 7V
V
= 15V
0.1
IN
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 5: Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
Note 6: The minimum on-time condition is specified for an inductor
peak-to-peak ripple current 40% of I
considerations in the Applications Information section).
Note 7: V
resistance.
= 10V
RUN/SS1, 2
FREQSET
1
1628 G02
= 5V unless otherwise noted.
pin internally tied to 1.19V reference through a large
10
100
90
70
80
50
60
5
Efficiency vs Input Voltage
(Figure 13)
MAX
MIN
3.25
190
120
280
– 6
6
(see minimum on-time
INPUT VOLTAGE (V)
15
–7.5
3.35
0.05
TYP
220
140
310
0.5
0.1
– 2
7.5
25
MAX
– 9.5
3.45
250
160
360
– 1
0.2
0.3
9.5
2
1
V
I
OUT
OUT
1628 G03
= 3A
UNITS
= 5V
1628fb
kHz
kHz
kHz
35
%
%
%
%
A
V
V
A