LTC1439 Linear Technology, LTC1439 Datasheet - Page 3

• Manufacturer Part Number: LTC1439
• Description: Dual High Efficiency/ Low Noise/ Synchronous Step-Down Switching Regulators
• Manufacturer: Linear Technology

SYMBOL
Main Control Loops
I
V
V
V
V
I
V
I
I
V
I
TGL1, 2 t
TGS1, 2 t
BG1, 2 t
Internal V
V
V
V
V
Oscillator and Phase-Locked Loop
f
R
I
Power-On Reset
V
I
V
t
ELECTRICAL CHARACTERISTICS
IN
SFB1
PROG1,2
Q
RUN/SS1,2
OSC
PLLLPF
LPOR2
DPOR2
OUT1,2
LINEREG1,2
LOADREG1,2
SFB1
OVL
RUN/SS1,2
INTVCC
LDO
LDO
EXTVCC
SATPOR2
THPOR2
V
PLLIN
SENSE(MAX)
V
OSENSE1,2
INT
EXT
r
, t
r
r
, t
CC
, t
f
f
f
Regulator
PARAMETER
Feedback Current
Regulated Output Voltage
Reference Voltage Line Regulation
Output Voltage Load Regulation
Secondary Feedback Threshold
Secondary Feedback Current
Output Overvoltage Lockout
V
Input DC Supply Current
Run Pin Threshold
Soft Start Current Source
Maximum Current Sense Threshold
TGL1, TGL2 Transition Time
TGS1, TGS2 Transition Time
BG1, BG2 Transition Time
Internal V
INTV
EXTV
EXTV
Oscillator Frequency
PLLIN Input Resistance
Phase Detector Output Current
POR2 Saturation Voltage
POR2 Leakage
POR2 Trip Voltage
POR2 Delay
PROG1,2
1.19V (Adjustable) Selected
3.3V Selected
5V Selected
Normal Mode
Shutdown
Rise Time
Fall Time
Rise Time
Fall Time
Rise Time
Fall Time
VCO High
Sinking Capability
Sourcing Capability
CC
CC
CC
Load Regulation
Voltage Drop
Switchover Voltage
Input Current
CC
Voltage
CONDITIONS
V
(Note 2)
V
V
V
V
I
I
V
V
V
0.5V > V
INTV
EXTV
3.6V < V
V
V
V
C
C
C
C
C
C
6V < V
I
I
I
C
LTC1439, V
LTC1439
f
f
I
V
V
V
V
V
TH1,2
TH1,2
INTVCC
INTVCC
INTVCC
PLLIN
PLLIN
POR2
PROG1,
PROG1,
PROG1,
PROG1,
IN
SFB1
SFB1
PROG1,2
RUN/SS1,2
RUN/SS1,2
OSENSE1,2
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
OSC
PROG2
POR2
PROG2
OSENSE2
PROG2
= 3.6V to 20V (Note 2), V
CC
CC
= 100pF, LTC1439: PLL LPF = 0V (Note 4)
= 1.6mA, V
Sinking 5 A (Note 2)
Sourcing 5 A
Ramping Negative
= 1.5V
< f
> f
= 3000pF
= 3000pF
= 500pF
= 500pF
= 3000pF
= 3000pF
IN
= 12V, V
= 20mA, V
= 20mA, V
= 20mA, EXTV
– 0.5V < V
Pin Open
Pin Open % of V
Pin Open
V
V
V
V
= 5V (Note 3)
T
PROG1,2
IN
, SENSE
OSC
OSC
< 30V, V
PROG2
PROG2
PROG2
PROG2
Ramping Negative
A
< 30V, V
= 0V, 3.6V < V
= 0V
= 0V, 5V V
= 25 C, V
PLLLPF
OSENSE2
Pins Open (Note 2)
Pins Open
= 0V
= INT V
OSENSE2
–
EXTVCC
EXTVCC
EXTVCC
PROG1,2
= 2.4V
1 and V
AUXON
CC
IN
PROG1,2
= 1.2V, V
CC
REF
= 4V
= 15V, V
Ramping Positive
IN
= 4V
= 5V
= 1V,
< INTV
= 0V
OSENSE1,2
< 15V
PROG1,2
= Pins Open
PROG2
CC
RUN/SS1,2
Pins Open
Pins Open
Pin Open
= 5V unless otherwise noted.
LTC1438/LTC1439
1.178
3.220
4.900
MIN
1.16
1.24
– 11
130
112
200
0.8
1.5
4.8
4.5
10
10
65536
0.002
1.19
3.30
5.00
– 0.5
1.19
1.28
– 0.2
– 7.5
TYP
320
150
100
170
125
240
1.3
5.0
4.7
0.6
0.2
10
– 1
–3
16
50
50
50
50
50
50
15
15
0.5
3
3
1.202
3.380
5.100
MAX
– 0.8
0.01
1.22
1.32
180
150
150
150
150
150
150
300
138
0.8
4.5
5.2
– 2
– 6
– 1
– 4
50
30
20
20
2
1
1
6
UNITS
Cycles
3
%/V
kHz
kHz
mV
mV
k
nA
ns
ns
ns
ns
ns
ns
%
%
%
%
V
V
V
V
A
V
A
A
A
A
V
A
V
V
A
A
V
A