LTC1538-AUX Linear Technology, LTC1538-AUX Datasheet - Page 3

• Manufacturer Part Number: LTC1538-AUX
• 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
LPOR1
DPOR1
OUT1,2
LINEREG1,2
LOADREG1,2
SFB1
OVL
RUN/SS1,2
INTVCC
LDO
LDO
EXTVCC
SATPOR1
THPOR1
V
PLLIN
SENSE(MAX)
V
OSENSE2
INT
EXT
r
, t
r
r
, t
CC
, t
f
f
f
Regulator – 5V Standby
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
POR1 Saturation Voltage
POR1 Leakage
POR1 Trip Voltage
POR1 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
INTV
INTV
INTV
C
LTC1539, V
LTC1539
f
f
I
V
V
V
V
V
TH1,2
TH1,2
PLLIN
PLLIN
POR1
PROG1,
PROG1,
PROG1,
PROG1,
IN
SFB1
SFB1
PROG1,2
RUN/SS1,2
RUN/SS1,2
OSENSE1,2
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
OSC
PROG1
POR1
PROG1
OSENSE1
PROG1
= 3.6V to 20V (Note 2), V
CC
CC
CC
CC
CC
= 100pF, LTC1539: 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
– 0.5V < V
= 20mA, V
= 20mA, V
= 20mA, EXTV
Pins Open
Pin Open % of V
Pin Open
V
V
V
V
= 5V (Note 3)
T
PROG1,2
IN
OSC
OSC
< 30V, V
Pin Open, SENSE
PROG2
PROG2
PROG2
PROG2
Ramping Negative
A
< 30V, V
= 0V, 3.6V < V
= 0V
= 0V, 5V V
= 25 C, V
PLLLPF
OSENSE1
Pins Open (Note 2)
Pins Open
= 0V
= INTV
OSENSE1
EXTVCC
PROG1,2
EXTVCC
EXTVCC
= 2.4V
AUXON
PROG1,2
CC
IN
CC
= 1.19V, V
REF
= 4V
= 15V, V
Ramping Positive
IN
= 1V,
= 4V
= 5V
< INTV
= 0V
–
< 15V
1 and V
PROG1,2
= Pins Open
CC
PROG1
RUN/SS1,2
OSENSE2
Pins Open
LTC1538-AUX/LTC1539
Pin Open
Pins
= 5V unless otherwise noted.
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
70
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
200
180
150
150
150
150
150
150
300
138
0.8
4.5
5.2
– 2
– 6
– 1
– 4
50
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