LTC1877EMS8#PBF Linear Technology, LTC1877EMS8#PBF Datasheet - Page 3

• Manufacturer Part Number: LTC1877EMS8#PBF
• Description: IC REG STP-DWN SYNC HI-EFF 8MSOP
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LTC1877EMS8#PBF

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 0.8 ~ 10 V
• Current - Output: 600mA
• Frequency - Switching: 550kHz
• Voltage - Input: 2.65 ~ 10 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Primary Input Voltage: 10V
• No. Of Outputs: 1
• Output Voltage: 10V
• Output Current: 600mA
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +85°C
• Msl: MSL 1 - Unlimited
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
SYMBOL
I
R
R
I
I
V
I
V
I
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC1877E is guaranteed to meet specifi cations from 0°C to
85°C. Specifi cations over the –40°C to 85°C operating temperature range
are assured by design, characterization and correlation with statistical
process controls. The LTC1877I is guaranteed over the full –40°C to 85°C
operating temperature range.
TYPICAL PERFORMANCE CHARACTERISTICS
PLL LPF
PK
LSW
SYNC/MODE
RUN
SYNC/MODE
RUN
PFET
NFET
100
95
90
85
80
75
70
65
60
55
50
0
Effi ciency vs Input Voltage
V
L = 10μH
Burst Mode OPERATION
OUT
2
= 2.5V
PARAMETER
Phase Detector Output Current
R
R
Peak Inductor Current
SW Leakage
SYNC/MODE Threshold
SYNC/MODE Leakage Current
RUN Threshold
RUN Input Current
DS(ON)
DS(ON)
Sinking Capability
Sourcing Capability
I
LOAD
INPUT VOLTAGE (V)
I
LOAD
4
of P-Channel MOSFET
of N-Channel MOSFET
= 100mA I
= 300mA
6
I
LOAD
LOAD
8
I
LOAD
= 0.1mA
= 10mA
10
= 1mA
1877 G01
12
CONDITIONS
f
f
I
I
V
V
100
PLLIN
PLLIN
SW
SW
90
80
70
60
50
40
30
20
10
FB
RUN
0
0.1
A
= 100mA
= –100mA
= 0.7V, Duty Cycle < 35%
Effi ciency vs Output Current
= 25°C. V
= 0V, V
V
< f
> f
IN
OSC
OSC
= 3.6V
V
The
IN
SW
1.0
V
= 7.2V
OUTPUT CURRENT (mA)
IN
l
IN
= 0V or 8.5V, V
= 3.6V
denotes the specifi cations which apply over the full operating
= 5V unless otherwise specifi ed.
PULSE-SKIPPING MODE
Burst Mode OPERATION
10
Note 3: T
dissipation P
Note 4: The LTC1877 is tested in a feedback loop which servos V
balance point for the error amplifi er (V
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
LTC1877EMS8: T
V
IN
= 7.2V
IN
100
J
V
L = 10μH
= 8.5V
OUT
is calculated from the ambient temperature T
D
= 2.5V
according to the following formulas:
1877 G02
1000
J
= T
A
+ (P
l
l
l
l
D
95
90
85
80
75
70
65
60
55
)(150°C/W)
0.1
Effi ciency vs Output Current
MIN
0.8
0.3
0.3
–3
3
ITH
= 1.2V).
1.0
OUTPUT CURRENT (mA)
±0.01
±0.01
±0.01
0.65
0.75
TYP
–10
1.0
1.0
0.7
10
L = 15μH
V
V
Burst Mode OPERATION
LTC1877
10
IN
OUT
= 10V
A
= 3.3V
and power
MAX
0.85
0.95
1.25
L = 10μH
–20
1.5
1.5
20
±1
±1
±1
100
FB
to the
1877 G03
UNITS
1877fa
3
1000
μA
μA
μA
μA
μA
Ω
Ω
A
V
V