Datasheet

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ELECTRICAL CHARACTERISTICS
PTV03020W
SLTS243A – FEBRUARY 2005 – REVISED OCTOBER 2007
operating at 25 ° C free-air temperature, V
I
= 3.3 V, V
O
= 2.5 V, C1 = 680 µ F, C2 = 22 µ F, C3 = 0 µ F, and I
O
= I
O
max (unless
otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
I
O
Output current Natural convection airflow 0 18
(1)
A
V
I
Input voltage range Over I
O
load range 2.95
(2)
3.6 V
Set-point voltage tolerance 2%
(3)
Temperature variation – 40 ° C < T
A
< 85 ° C 0.5%
Line regulation Over V
I
range 5 mV
V
O
Load regulation Over I
O
range 5 mV
Total output variation Includes set-point, line, load, – 40 ° C ≤ T
A
≤ 85 ° C 3
(3)
%V
o
Adjust range Over V
I
range 0.8 2.5 V
R
SET
= 2.21 k Ω , V
O
= 2.5 V 95%
R
SET
= 5.49 k Ω , V
O
= 1.8 V 92%
R
SET
= 8.87 k Ω , V
O
= 1.5 V 90%
η Efficiency I
O
= 12 A
R
SET
= 17.4 k Ω , V
O
= 1.2 V 88%
R
SET
= 36.5 k Ω , V
O
= 1 V 86%
R
SET
= Open, V
O
= 0.8 V 83%
Output voltage ripple
20-MHz bandwidth 20 mV
PP
(pk-pk)
I
O
(trip) Overcurrent threshold Reset, followed by auto-recovery 35 A
1-A/ µ s load step, 50 to 100% I
O
max, C3 = 330 µ F
Transient response Recovery time 70 µ s
V
o
over/undershoot 120 mV
I
IL
Input low current Pin to GND – 0.13 mA
Track control (pin 9)
Control slew-rate limit C3 ≤ C3 (max) 1 V/ms
V
I
increasing 2.8 2.95
UVLO Undervoltage lockout V
V
I
decreasing 2.2 2.7
V
IH
Input high voltage V
I
– 0.5 Open
(4)
Referenced to GND V
Inhibit control (pin 12) V
IL
Input low voltage – 0.2 0.6
I
IL
Input low current Pin to GND 0.24 mA
I
I
(stby) Input standby current Inhibit (pin 12) to GND, Track (pin 9) open 10 mA
ƒ
S
Switching frequency Over V
I
and I
O
ranges 250 300 340 kHz
Nonceramic (C1) 680
(5)
External input capacitance µ F
Ceramic (C2) 22
(5)
Nonceramic 0 330
(6)
11,000
(7)
Capacitance value µ F
External output capacitance
Ceramic 0 300
(C3)
Equivalent series resistance (nonceramic) 4
(8)
m Ω
Per Telcordia SR-332, 50% stress, T
A
= 40 ° C, ground
MTBF Reliability 5
10
6
Hr
benign
(1) See thermal derating curves for safe operating area (SOA), or consult factory for appropriate derating.
(2) The minimum input voltage is 2.95 V or V
O
+ 0.65 V, whichever is greater.
(3) 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.
(4) This control pin is pulled up to the input voltage, V
I
. If this input is left open circuit, the module will operate when input power is applied.
A small low-leakage (< 100 nA) MOSFET is recommended for control. For further information, consult the related application note.
(5) A 22- µ F high-frequency ceramic capacitor and 680- µ F electrolytic input capacitor are required for proper operation. The electrolytic
capacitor must be rated for 750 mArms minimum ripple current. Consult the Application Information for further guidance on capacitor
selection.
(6) An external output capacitor is not required for basic operation. Adding 330 µ F of distributed capacitance at the load improves the
transient response.
(7) This is the calculated maximum. The minimum ESR limitation often results in a lower value. When controlling the Track pin using a
voltage supervisor, C
O
(max) is reduced to 6600 µ F. Consult the Application Information for further guidance.
(8) This is the typical ESR for all the electrolytic (nonceramic) output capacitance. Use 7 m Ω as the minimum when using maximum-ESR
values to calculate.
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