Datasheet

LTC1877
2
1877fb
PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage (V
IN
) ..........................–0.3V to 11V
I
TH
, PLL LPF Voltage ................................. –0.3V to 2.7V
RUN, V
FB
Voltages ...................................... –0.3V to V
IN
SYNC/MODE Voltage .................................. –0.3V to V
IN
SW Voltage ................................... –0.3V to (V
IN
+ 0.3V)
P-Channel MOSFET Source Current (DC) ............ 800mA
N-Channel MOSFET Sink Current (DC) ................ 800mA
Peak SW Sink and Source Current ..........................1.5A
Operating Temperature Range (Note 2) .....–40°C to 85°C
Junction Temperature (Note 3) ............................ 125°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec) ................... 300°C
(Note 1)
1
2
3
4
RUN
I
TH
V
FB
GND
8
7
6
5
PLL LPF
SYNC/MODE
V
IN
SW
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C, θ
JA
= 150°C/W
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC1877EMS8#PBF LTC1877EMS8#TRPBF LTLU 8-Lead Plastic MSOP –40°C to 85°C
LTC1877IMS8#PBF LTC1877IMS8#TRPBF LTLV 8-Lead Plastic MSOP –40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to: http://www
.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
VFB
Feedback Current (Note 4)
l
430 nA
V
FB
Regulated Output Voltage (Note 4) 0°C ≤ T
A
≤ 85°C
(Note 4) –40°C ≤ T
A
≤ 85°C
l
0.784
0.74
0.8
0.8
0.816
0.84
V
V
ΔV
OVL
Output Overvoltage Lockout ΔV
OVL
= V
OVL
– V
FB
l
20 50 110 mV
ΔV
FB
Reference Voltage Line Regulation V
IN
= 2.65V to 10V (Note 4) 0.05 0.15 %/V
V
LOADREG
Output Voltage Load Regulation Measured in Servo Loop; V
ITH
= 0.9V to 1.2V
Measured in Servo Loop; V
ITH
= 1.6V to 1.2V
l
l
0.1
–0.1
0.5
–0.5
%
%
V
IN
Input Voltage Range
l
2.65 10 V
I
Q
Input DC Bias Current
Pulse-Skipping Mode
Burst Mode Operation
Shutdown
(Note 5)
2.65V < V
IN
< 10V, V
SYNC/MODE
= 0V, I
OUT
= 0A
V
SYNC/MODE
= V
IN
, I
OUT
= 0A
V
RUN
= 0V, V
IN
= 10V
230
10
0
350
15
1
μA
μA
μA
f
OSC
Oscillator Frequency V
FB
= 0.8V
V
FB
= 0V
495 550
80
605 kHz
kHz
f
SYNC
SYNC Capture Range 400 700 kHz
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 5V unless otherwise specifi ed.