Datasheet
ELECTRICAL CHARACTERISTICS
PTH12020W/L
SLTS208I – MAY 2003 – REVISED MARCH 2009 .............................................................................................................................................................
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T
A
= 25 ° C, V
I
=12 V, V
O
= 1.8 V, C
I
= 560 µ F, C
O
= 0 µ F, and I
o
= I
omax
(unless otherwise noted)
PTH12020L
PARAMETER TEST CONDITIONS UNIT
MIN TYP MAX
60 ° C, 200 LFM airflow 0 18
(1)
I
O
Output current A
25 ° C, natural convection 0 18
(1)
V
I
Input voltage range Over I
o
range 10.8 13.2 V
V
o
tol Set-point voltage tolerance ± 2
(2)
%V
o
Δ Reg
temp
Temperature variation – 40C < T
A
< 85 ° C ± 0.5 %V
o
Δ Reg
line
Line regulation Over V
I
range ± 5 mV
Δ Reg
load
Load regulation Over I
o
range ± 5 mV
Δ Reg
tot
Total output variation Includes set-point, line, load, – 40 ° C ≤ T
A
≤ 85 ° C 3
(2)
%V
o
Δ V
adj
Output voltage adjust range Over V
I
range 0.8 1.8 V
R
SET
= 130 Ω , V
o
= 1.8 V 89%
R
SET
= 3.57 k Ω , V
o
= 1.5 V 87%
η Efficiency I
O
= 12 A R
SET
= 12.1 k Ω , V
o
= 1.2 V 85%
R
SET
= 32.4 k Ω , V
o
= 1.0 V 83%
R
SET
= open cct., V
o
= 0.8 V 80%
V
r
V
o
ripple (pk-pk) 20 MHz bandwidth 1 %V
o
I
o
trip Over-current threshold Reset, followed by auto-recovery 30 A
t
tr
Recovery time 70 µ Sec
1 A/ µ s load step, 50 to
Transient response
100% I
o
max,C
out
= 330 µ F
Δ V
tr
V
o
over/undershoot 70 mV
Δ V
o
margin Margin up/down adjust ± 5%
I
IL
margin Margin input current (pins 9 /10) Pin to GND – 8
(3)
µ A
I
IL
track Track input current (pin 8) Pin to GND – 0.13
(3)
mA
dV
track
/dt Track slew rate capability C
out
≤ C
out
(max) 1 V/ms
V
I
increasing 9.7 10.4
UVLO Undervoltage lockout V
V
I
decreasing 8.8 9.2
V
IH
Input high voltage, Referenced to GND Open
(4)
V
V
IL
Inhibit control (pin 3) Input low voltage, Referenced to GND – 0.2 0.5
I
IL
Input low current, Pin 3 to GND 0.24 mA
I
I
Input standby current Inhibit (pin 3) to GND, Track (pin 8) open 5 mA
ƒ
s
Switching frequency Over V
I
and I
o
ranges 200 250 300 kHz
C
I
External input capacitance 560
(5)
F
Non-ceramic 0 330
(6)
9900
(7)
Capacitance value µ F
C
O
External output capacitance Ceramic 0 300
Equivalent series resistance (non-ceramic) 4
(8)
m Ω
MTBF Reliability Per Bellcore TR-332, 50% stress, T
A
= 40 ° C, ground benign 5.3
10
6
Hrs
(1) See SOA curves or consult factory for appropriate derating.
(2) The set-point voltage tolerance is affected by the tolerance and stability of RSET. The stated limit is unconditionally met if RSET has a
tolerance of 1%, with 100 ppm/ ° C or better temperature stability.
(3) A small low-leakage ( < 100 nA) MOSFET is recommended to control this pin. The open-circuit voltage is less than 1 Vdc.
(4) This control pin is pulled up to an internal supply voltage. If this input is left open-circuit the module will operate when input power is
applied. A small low-leakage ( < 100 nA) MOSFET or open-drain/collector voltage supervisor IC is recommended for control. Do not place
an external pull-up on this pin. For further information, consult the related application note.
(5) A 560 µ F electrolytic input capacitor is required for proper operation. The capacitor must be rated for a minimum of 800 mA rms of ripple
current.
(6) An external output capacitor is not required for basic operation. Adding 330 µ F of distributed capacitance at the load will improve the
transient response.
(7) This is the calculated maximum. The minimum ESR limitation will often result in a lower value. When controlling the Track pin using a
voltage supervisor, the maximum output capacitance is reduced to 6600 µ F. Consult the application notes for further guidance.
(8) This is the typical ESR for all the electrolytic (non-ceramic) output capacitance. Use 7 m Ω as the minimum when using max-ESR values
to calculate.
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