Datasheet

2
LTC1649
LTC1649CS LTC1649IS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
V
IN
Minimum Supply Voltage Figure 1 (Note 3) ● 2.7 2.7 V
V
FB
Feedback Voltage Figure 1 ● 1.25 1.265 1.28 1.23 1.265 1.29 V
V
CPOUT
Charge Pump Output Voltage Figure 1 ● 4.8 5 5.2 4.75 5 5.25 V
I
IN
Supply Current (V
IN
)V
SHDN
= V
CC
, I
LOAD
= 0 ● 35 35 mA
V
SHDN
= 0V 10 25 10 25 µA
I
PVCC1, 2
Supply Current (P
VCC1, 2
)P
VCC
= 5V, V
SHDN
= V
CC
(Note 4) 1.5 1.5 mA
V
SHDN
= 0V 0.1 0.1 µA
f
CP
Internal Charge Pump Frequency I
CPOUT
= 20mA (Note 5) 700 700 kHz
f
OSC
Internal PWM Oscillator Frequency ● 140 200 260 130 200 325 kHz
V
IH
SHDN Input High Voltage ● 2.4 2.4 V
V
IL
SHDN Input Low Voltage ● 0.8 0.8 V
I
IN
SHDN Input Current ● ±0.01 ±1 ±0.01 ±1 µA
gm
V
Error Amplifier Transconductance 650 650 µMho
gm
I
I
LIM
Amplifier Transconductance (Note 6) 1300 1300 µMho
I
IMAX
I
MAX
Sink Current V
IMAX
= V
CC
● 8 12 16 8 12 17 µA
I
SS
Soft Start Source Current V
SS
= 0V ● –8 –12 –16 –8 –12 –17 µA
t
r
, t
f
Driver Rise/Fall Time P
VCC1
= P
VCC2
= 5V (Note 7) 80 250 80 250 ns
t
NOV
Driver Non-Overlap Time P
VCC1
= P
VCC2
= 5V 25 130 250 25 130 250 ns
DC
MAX
Maximum Duty Cycle V
COMP
= V
CC
90.5 93 90.5 93 %
Supply Voltage
V
IN
........................................................................................... 6V
V
CC
........................................................................................... 9V
P
VCC1, 2
................................................................................ 13V
Input Voltage
I
FB
....................................................................... –0.3V to 18V
C
+
, C
–
................................................ –0.3V to (V
IN
+ 0.3V)
All Other Inputs ....................... –0.3V to (V
CC
+ 0.3V)
Operating Temperature Range
LTC1649C ............................................... 0°C to 70°C
LTC1649I............................................ –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ABSOLUTE MAXIMUM RATINGS
W
WW
U
T
JMAX
= 150°C, θ
JA
= 110°C/W
ORDER PART
NUMBER
LTC1649CS
LTC1649IS
TOP VIEW
S PACKAGE
16-LEAD PLASTIC SO
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
G1
P
VCC1
GND
FB
SHDN
SS
V
IN
C
–
G2
P
VCC2
V
CC
I
FB
I
MAX
COMP
CP
OUT
C
+
PACKAGE/ORDER INFORMATION
UUW
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 (Note 2)
(Note 1)
Consult factory for parts specified with wider operating temperature ranges.