LTC3561
2
3561f
PV
IN
, SV
IN
Voltages .....................................–0.3V to 6V
V
FB
, SHDN/R
T
Voltages ................ –0.3V to (V
IN
+ 0.3V)
I
TH
Voltage ................................................–0.3V to 1.4V
SW Voltage ................................... – 0.3V to (V
IN
+ 0.3V)
Operating Ambient Temperature Range
(Note 2) .................................................. –40°C to 85°C
Junction Temperature (Notes 5, 8) ....................... 125°C
Storage Temperature Range ................. –65°C to 125°C
ABSOLUTE AXI U RATI GS
W
WW
U
(Note 1)
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.3V, R
T
= 324k unless otherwise specified. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Operating Voltage Range 2.625 5.5 V
I
FB
Feedback Pin Input Current (Note 3) ±0.1 µA
V
FB
Feedback Voltage (Note 3) ● 0.784 0.8 0.816 V
∆V
LINEREG
Reference Voltage Line Regulation V
IN
= 2.7V to 5V 0.04 0.2 %/V
∆V
LOADREG
Output Voltage Load Regulation I
TH
= 0.36, (Note 3) ● 0.02 0.2 %
I
TH
= 0.84, (Note 3) ● –0.02 –0.2 %
g
m(EA)
Error Amplifier Transconductance I
TH
Pin Load = ±5µA (Note 3) 800 µS
I
S
Input DC Supply Current (Note 4)
Active Mode V
FB
= 0.75V 240 350 µA
Shutdown V
SHDN/RT
= 3.3V 0.1 1 µA
V
SHDN/RT
Shutdown Threshold High V
IN
– 0.6 V
IN
– 0.4 V
Active Oscillator Resistor 324k 1M Ω
f
OSC
Oscillator Frequency R
T
= 324k 0.85 1 1.15 MHz
(Note 7) 4 MHz
I
LIM
Peak Switch Current Limit I
TH
= 1.3 1.4 1.7 A
R
DS(ON)
Top Switch On-Resistance (Note 6) V
IN
= 3.3V 0.11 0.15 Ω
Bottom Switch On-Resistance (Note 6) V
IN
= 3.3V 0.11 0.15 Ω
I
SW(LKG)
Switch Leakage Current V
IN
= 6V, V
ITH/RUN
= 0V, V
FB
= 0V 0.01 1 µA
V
UVLO
Undervoltage Lockout Threshold V
IN
Ramping Down 2.375 2.5 2.625 V
PACKAGE/ORDER I FOR ATIO
UUW
T
JMAX
= 125°C, θ
JA
= 43°C/W, θ
JC
= 3°C/W
EXPOSED PAD (PIN 9) MUST BE SOLDERED TO GROUND
TOP VIEW
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
5
6
7
8
4
9
3
2
1SHDN/R
T
SGND
SW
PGND
I
TH
V
FB
SV
IN
PV
IN
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. No pin shall exceed 6V.
Note 2: The LTC3561E is guaranteed to meet specified performance from
0°C to 85°C. Specifications over the – 40°C to 85°C operating ambient
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: The LTC3561 is tested in a feedback loop which servos V
FB
to the
midpoint for the error amplifier (V
ITH
= 0.6V).
Note 4: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
ORDER PART NUMBER
DD PART MARKING
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LTC3561EDD LCJJ
