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SLTS211F – MAY 2003 – REVISED FEBRUARY 2007
ELECTRICAL CHARACTERISTICS
T
A
= 25°C, V
I
= 12 V, V
O
= 3.3 V, C
I
= 560
µF,
C
O
= 0
µF,
and I
O
= I
O
max (unless otherwise stated)
PTH12030W
CHARACTERISTICS
I
O
V
I
V
O
tol
∆Reg
temp
∆Reg
line
∆Reg
load
∆Reg
tot
∆V
adj
Output current
Input voltage range
Set-point voltage tolerance
Temperature variation
Line regulation
Load regulation
Total qutput variation
V
O
adjust range
–40°C < T
A
< 85°C
Over V
I
range
Over I
O
range
Includes set-point, line, load, –40
°C ≤
T
A
≤
85
°C
Over V
I
range
R
SET
= 280
Ω
R
SET
= 2 kΩ
η
Efficiency
I
O
= 18 A
R
SET
= 4.32 kΩ
R
SET
= 11.5 kΩ
R
SET
= 24.3 kΩ
V
O
ripple (peak-to-peak)
I
O
trip
t
tr
∆V
tr
Overcurrent threshold
Transient response
Margin control (pins 12&13)
I
IL
track
dV
track
/dt
UVLO
Inhibit
control
(pin 4)
I
I
inh
fs
C
I
C
O
MTBF
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
Track input current (pin 11)
Track slew rate capability
Undervoltage lockout
Input high voltage (V
IH
)
Input low voltage (V
IL
)
Input low current (I
IL
)
Input standby current
Switching frequency
External input capacitance
External output capacitance
Reliability
Capacitance value
Equiv. series resistance (nonceramic)
Bellcore TR-332, 50% stress, T
A
=40°C, ground benign
nonceramic
ceramic
20-MHz bandwidth
Reset, followed by auto-recovery
1 A/µs load step,
50 to 100% I
O
max, C
O
= 330 µF
Margin up/down adjust
Margin input current, Pin to GND
Pin to GND
C
O
≤
C
O
(max)
V
I
increasing
V
I
decreasing
Referenced to GND
Referenced to GND
Pin 4 to GND
Inhibit (pin 4) to GND, track (pin 11) V
I
Over V
I
and I
O
ranges
475
560
(6)
0
0
4
(9)
3
330
(7)
7,150
(8)
300
8.8
2.5
–0.2
0.5
10
575
675
9.5
8.5
Open
(5)
0.5
Recovery Time
V
O
over/undershoot
V
O
= 5 V
V
O
= 3.3 V
V
O
= 2.5 V
V
O
= 1.8 V
V
O
= 1.5 V
All Voltages
1.2
94.5%
92.7%
91.4%
89.5%
88.2%
86.2%
25
50
50
150
±5%
-8
(3)
-0.13
(4)
1
8
µA
µA
V/ms
V
V
µA
mA
kHz
µF
µF
mΩ
10
6
Hrs
mV
PP
A
µS
mV
±0.5
±5
±5
±3
(2)
5.5
CONDITIONS
60°C, 200 LFM airflow
25°C, natural convection
Over l
O
range
MIN
0
0
10.2
TYP
MAX
26
(1)
26
(1)
13.8
±2
(2)
UNIT
A
V
%V
O
%V
O
mV
mV
%V
O
V
R
SET
= open circuit V
O
= 1.2 V
See SOA curves or consult factory for appropriate derating.
The set-point voltage tolerance is affected by the tolerance and stability of R
SET
. The stated limit is unconditionally met if R
SET
has a
tolerance of 1 %, with 100 ppm/°C (or better) temperature stability.
A small, low-leakage (<100 nA) MOSFET is recommended to control this pin. The open-circuit voltage is less than 1 Vdc.
A low-leakage (<100 nA), open-drain device, such as MOSFET or voltage supervisor IC, is recommended to control this pin.
This control pin is pulled up to an internal 5-V source. To avoid risk of damage to the module,
do not
apply an external voltage greater
than 7 V. If it is left open-circuit, the module operates when input power is applied. A small, low-leakage (<100 nA) MOSFET or
open-drain/collector voltage supervisor IC is recommended for control. For further info, see the related application information section.
A 560
µF
electrolytic input capacitor, rated for a minimum of 500 mArms of ripple current is required for proper operation.
An external output capacitor is not required for basic operation. Adding 330 µF of distributed capacitance at the load will improve the
transient response.
This is the calculated maximum. The minimum ESR limitation often results in a lower value. See the application information section.
This is the typical ESR for all the electrolytic (nonceramic) ouput capacitance. Use 7 mΩ as the minimum when using max-ESR values
to calculate.
3
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