DICE/DWF SPECIFICATION
LTC1707
High Efficiency Monolithic
Synchronous Step-Down Switching Regulator
1
8
PAD FUNCTION
7
2
1.
2.
3.
4.
5.
6.
7.
8.
ITH
RUN/SS
VFB
GND
SW
VIN
SYNC/MODE
VREF
DIE CROSS REFERENCE
LTC Finished
Part Number
Order DICE CANDIDATE
Part Number Below
LTC1707
LTC1707
LTC1707 DICE
LTC1707 DFN
3
4
6
5
4
4
5
210 × 116 mils
W W
W
AXI U
U
ABSOLUTE
RATI GS
(Note 1)
Input Supply Voltage ................................ – 0.3V to 10V
ITH Voltage ................................................. – 0.3V to 5V
RUN/SS, VFB Voltages ............................... – 0.3V to VIN
SYNC/MODE Voltage ................................. – 0.3V to VIN
P-Channel Switch Source Current (DC) .............. 800mA
N-Channel Switch Sink Current (DC) .................. 800mA
Peak SW Sink and Source Current ......................... 1.5A
Junction Temperature (Note 2) ............................. 125°C
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
1
DICE/DWF SPECIFICATION
LTC1707
W
DICE ELECTRICAL TEST LI ITS
SYMBOL
IVFB
VFB
∆VOVL
∆VFB
VLOADREG
PARAMETER
Feedback Current
Regulated Feedback Voltage
Output Overvoltage Lockout
Reference Voltage Line Regulation
Output Voltage Load Regulation
IS
VRUN/SS
IRUN/SS
ISYNC/MODE
fOSC
Input DC Bias Current
Pulse Skipping Mode
Burst Mode Operation
Shutdown
Shutdown
Run/SS Threshold
Soft-Start Current Source
SYNC/MODE Pull-Up Current
Oscillator Frequency
VUVLO
Undervoltage Lockout
RPFET
RNFET
IPK
ILSW
VREF
∆VREF
RDS(ON) of P-Channel FET
RDS(ON) of N-Channel FET
Peak Inductor Current
SW Leakage
Reference Output Voltage
Reference Output Load Regulation
VIN = 5V unless otherwise specified.
CONDITIONS
(Note 3)
(Note 3)
∆VOVL = VOVL – VFB
VIN = 3V to 8.5V (Note 3)
ITH Sinking 2µA (Note 3)
ITH Sourcing 2µA (Note 3)
(Note 4)
VIN = 8.5V, VOUT = 3.3V, VSYNC/MODE = 0V
VITH = 0V, VIN = 8.5V, VSYNC/MODE = Open
VRUN/SS = 0V, 3V < VIN < 8.5V
VRUN/SS = 0V, VIN < 3V
VRUN/SS Ramping Positive
VRUN/SS = 0V
VSYNC/MODE = 0V
VFB = 0.7V
VFB = 0V
VIN Ramping Down from 3V (0°C to 70°C)
VIN Ramping Up from 0V (0°C to 70°C)
VIN Ramping Down from 3V (–40°C to 85°C)
VIN Ramping Up from 0V (–40°C to 85°C)
ISW = –100mA
ISW = – 100mA
VIN = 4V, ITH = 1.4V, Duty Cycle < 40%
VRUN/SS = 0V
IREF = 0µA
0V ≤ IREF ≤ 100µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
TJ = TA + (PD • θJA)
2
Linear Technology Corporation
MIN
0.78
20
MAX
60
0.82
110
0.01
0.8
– 0.8
UNITS
nA
V
mV
%/V
%
%
320
35
0.4
1.2
0.5
315
1.0
3.3
2.5
385
2.55
2.60
2.45
2.50
2.85
3.00
2.85
3.00
0.7
0.8
1.10
±1000
1.202
15
0.70
1.178
µA
µA
µA
µA
V
µA
µA
kHz
kHz
V
V
V
V
Ω
Ω
A
nA
mV
mV
Note 3: The LTC1707 is tested in a feedback loop that servos VFB to the
balance point for the error amplifier (VITH = 0.8V).
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
LT/LT 0605 PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
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© LINEAR TECHNOLOGY CORPORATION 2005