Datasheet

2
LT1310
sn1310 1310fs
PARAMETER CONDITIONS MIN TYP MAX UNITS
Undervoltage Lockout 2.8 V
Maximum Input Voltage 18 V
Feedback Voltage 1.242 1.255 1.268 V
● 1.236 1.268 V
FB Pin Bias Current 60 150 nA
Reference Line Regulation V
IN
= 2.9V to 18V 0.01 0.05 %/V
Error Amplifier Transconductance ∆I = 5µA 350 µA/V
Error Amplifier Voltage Gain 200 V/V
SW Current Limit 1.5 2.1 2.8 A
SW Saturation Voltage I
SW
= 1A 0.240 0.320 V
SW Maximum Duty Cycle C
T
= 220pF 80 84 %
C
T
= 47pF 78 83 %
SW Minimum On Time I
SW
= 150mA, V
C
= 0.25V 70 ns
VCO Frequency C
T
= 220pF, PLL-LPF = High 0.950 1.10 1.25 MHz
C
T
= 220pF, PLL-LPF = High ● 0.800 1.30 MHz
C
T
= 220pF, PLL-LPF = Low 500 630 kHz
C
T
= 47pF, PLL-LPF = High 3.3 MHz
Frequency Foldback C
T
= 220pF, PLL-LPF = High, FB = 0V 200 kHz
PLL Lock Range C
T
= 220pF, Maximum 0.950 1.10 1.25 MHz
C
T
= 220pF, Minimum (Percent Change from Max) –40 –50 %
Supply Current SHDN = High 11.5 15 mA
SHDN = Low 1 µA
SW Leakage Current Switch Off, SW = 3.3V 0.1 5 µA
SHDN Pin Bias Current V
SHDN
= 2.4V 35 65 µA
SHDN Pin High Active Mode 2.4 V
SHDN Pin Low Shutdown Mode 0.4 V
(Note 1)
SW Voltage .............................................................. 36V
V
IN
Voltage ............................................................. 18V
SHDN Voltage ......................................................... 18V
SYNC Voltage ........................................................... 5V
FB Voltage ................................................................. 5V
C
T
Voltage ................................................................. 5V
V
C
Voltage ................................................................. 2V
PLL-LPF Pin Current............................................... 1mA
Operating Temperature Range (Note 2) .. –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................300°C
ORDER PART
NUMBER
LT1310EMSE
T
JMAX
= 125°C, θ
JA
= 40°C/W
EXPOSED PAD IS GROUND
(MUST BE SOLDERED TO PCB)
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.3V, V
SHDN
= 3.3V, unless otherwise noted. (Note 2)
1
2
3
4
5
FB
SHDN
PLL-LPF
SYNC
GND
10
9
8
7
6
V
C
C
T
V
IN
SW
SW
TOP VIEW
MSE EXPOSED PAD PACKAGE
10-LEAD PLASTIC MSOP
MSE PART MARKING
LTRZ
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1310E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, chacterization and correlation
with statistical process controls.
ABSOLUTE AXI U RATI GS
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PACKAGE/ORDER I FOR ATIO
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ELECTRICAL CHARACTERISTICS