Datasheet

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ELECTRICAL CHARACTERISTICS
PTN04050A
SLTS250 – SEPTEMBER 2005
operating at 25°C free-air temperature, V
I
= 5 V, V
O
= –12 V, I
O
= I
O
(max), C
I
= 100 µF, C
O
= 100 µF (unless otherwise
noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
O
= –3.3 V to –6 V 0.2
(1)
1.0
(2)
V
O
= –9 V 0.1
(1)
0.6
(2)
I
O
Output current T
A
= 85°C, natural convection airflow A
V
O
= –12 V 0.1
(1)
0.5
(2)
V
O
= –12.6 V to –15 V 0.1
(1)
0.3
P
O
Output power 6 W
V
I
Input voltage range Over I
O
range 2.9 7 V
Set-point voltage tolerance T
A
= 25°C ±3
(3)
%
Temperature variation –40°C to +85°C ±0.5 %V
O
Line regulation Over V
I
range 0.5 %V
O
V
O
Load regulation Over I
O
range 0.25 %V
O
Includes set point, line, load
Total output voltage variation ±5
(3)
%V
O
–40 < T
A
< 85°C
V
O
Adj Output voltage adjust range –15 –3.3 V
R
SET
= 523 Ω, V
O
= –15 V, I
O
= 0.3 A 80
R
SET
= 1.96 k Ω, V
O
= –12 V, I
O
= 0.5 A 82
η Efficiency R
SET
= 4.53 k Ω, V
O
= –9 V, I
O
= 0.6 A 83 %
R
SET
= 15.4 k Ω, V
O
= –5 V, I
O
= 1.0 A 82
R
SET
= 36.5 k Ω, V
O
= –3.3 V, I
O
= 1.0 A 78
V
r
Output voltage ripple 20-MHz bandwidth 3% V
O
V
(PP)
I
O (LIM)
Current limit threshold Reset, followed by auto-recovery 150 %I
Omax
Recovery time 100 µs
1 A/µs load step
Transient response
from 50% to 100% I
O
max
(4)
V
O
over/undershoot 2 %V
O
F
S
Switching frequency Over V
I
and I
O
ranges 210 260 310 kHz
V
I
increasing 2.50 2.55 V
UVLO Undervoltage lockout
V
I
decreasing 2.30 2.40
Input high voltage (V
IH
) V
I
– 0.5 Open
(5)
V
Inhibit control (pin 3) Input low voltage (V
IL
) –0.2 +0.25
Input low current (I
IL
) 10 µA
I
I
inh Inhibit standby current Inhibit (pin 3) to GND (pin 1) 470 µ A
C
I
External input capacitance 100
(6)
µF
Ceramic 0 100
(7)
µF
C
O
External output capacitance Nonceramic 100
(8)
560
(9)
µF
Equivalent series resistance (nonceramic) 10
(10)
m Ω
Per Telcordia SR-332, 50% stress,
MTBF Calculated reliability 7.5
10
6
Hrs
T
A
= 40°C, ground benign
(1) The module will operate down to no load with reduced specifications.
(2) The maximum output current is 1 A or the maximum output power is 6 W, whichever is less.
(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) A load step from 66% to 100% I
O
max for V
O
= –15 V.
(5) This control pin has an internal pull-up to the input voltage, V
I
. If it is left open circuit, the module operates when input power is applied.
A small, low-leakage (< 100 nA) metal-oxide semiconductor field effect transistor (MOSFET) is recommended for control. See the
application Information for further guidance.
(6) 100 µ F of capacitance is required across the input (V
I
and GND) for proper operation. Locate the ceramic capacitance close to the
module.
(7) When using ceramic output capacitance equivalent to 100 µ F, a 100 µ F electrolytic capacitor is also required.
(8) 100 µF of output capacitance is required for proper operation. See the application information for further guidance.
(9) The minimum ESR limitation may result in a lower value for the output capacitance. See the Input/Output Capacitor Recommendations
for further guidance.
(10) This is the typical ESR for all the electrolytic (nonceramic) capacitance. Use 17 m Ω as the minimum when using maximum ESR values
to calculate.
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