Datasheet

2
LTC1878
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
VFB
Feedback Current (Note 4) ● 430 nA
V
FB
Regulated Output Voltage (Note 4) 0°C ≤ T
A
≤ 85°C 0.784 0.8 0.816 V
(Note 4) –40°C ≤ T
A
≤ 85°C ● 0.74 0.8 0.84 V
∆V
OVL
Output Overvoltage Lockout ∆V
OVL
= V
OVL
– V
FB
● 20 50 110 mV
∆V
FB
Reference Voltage Line Regulation V
IN
= 2.65V to 6V (Note 4) 0.05 0.2 %/V
V
LOADREG
Output Voltage Load Regulation Measured in Servo Loop; V
ITH
= 0.9V to 1.2V ● 0.1 0.5 %
Measured in Servo Loop; V
ITH
= 1.6V to 1.2V ● –0.1 –0.5 %
V
IN
Input Voltage Range ● 2.65 6 V
I
Q
Input DC Bias Current (Note 5)
Pulse Skipping Mode 2.65V < V
IN
< 6V, V
SYNC/MODE
= 0V, I
OUT
= 0A 230 350 µA
Burst Mode Operation V
SYNC/MODE
= V
IN
, I
OUT
= 0A 10 15 µA
Shutdown V
RUN
= 0V, V
IN
= 6V 0 1 µA
f
OSC
Oscillator Frequency V
FB
= 0.8V 495 550 605 kHz
V
FB
= 0V 80 kHz
f
SYNC
SYNC Capture Range 400 700 kHz
I
PLL LPF
Phase Detector Output Current
Sinking Capability f
PLLIN
< f
OSC
● 3 10 20 µA
Sourcing Capability f
PLLIN
> f
OSC
● –3 –10 –20 µA
R
PFET
R
DS(ON)
of P-Channel MOSFET I
SW
= 100mA 0.5 0.7 Ω
R
NFET
R
DS(ON)
of N-Channel MOSFET I
SW
= –100mA 0.6 0.8 Ω
LTC1878EMS8
T
JMAX
= 125°C, θ
JA
= 150°C/W
ORDER PART
NUMBER
(Note 1)
Input Supply Voltage (V
IN
)...........................–0.3V to 7V
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 Ambient 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
1
2
3
4
8
7
6
5
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
PLL LPF
SYNC/MODE
V
IN
SW
RUN
I
TH
V
FB
GND
MS8 PART MARKING
Consult factory for Industrial and Military grade parts.
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C.
V
IN
= 3.6V unless otherwise specified.
LTNX
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
ELECTRICAL CHARACTERISTICS