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PIP250M,518

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
Philips Semiconductors
PIP250M
Integrated buck converter
Product data Rev. 02 — 21 February 2003 7 of 19
9397 750 10904
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
7.2.6 Undervoltage and overvoltage protection
With reference to Figure 1, the FB pin is connected internally to the overvoltage and
undervoltage comparators, labelled OVP and UVP respectively. In normal operation,
the voltage on FB is regulated at 0.8 V.
If the voltage on FB exceeds the overvoltage protection (OVP) threshold (1 V) for
longer than 30 µs, an overvoltage condition is detected, the gate drive signals to the
MOSFETs are disabled, and the PIP250M latches off. To reset the latch, the
PIP250M must be powered down by reducing V
DDC
below the power down reset
threshold and then increasing V
DDC
back up to 5 V.
If the voltage on FB drops below the undervoltage protection (UVP) threshold (0.5 V)
for longer than 30 µs, then an undervoltage condition is detected and the gate drive
signals to the MOSFET drivers are turned off. If three undervoltage pulses are
detected then the PIP250M latches off. To reset the PIP250M, the supply voltage
(V
DDC
) must be reduced below the power down reset threshold and then increased
back up to 5 V.
Fig 5. Overcurrent trip level as a function of R
OCSET
.
03ak48
0
10
20
30
1234
R
OCSET
(kΩ)
I
TRIP
(A)
Philips Semiconductors
PIP250M
Integrated buck converter
Product data Rev. 02 — 21 February 2003 8 of 19
9397 750 10904
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
8. Limiting values
[1] Pulse width and repetition rate limited by maximum value of T
j
.
[2] Assumes a thermal resistance from junction to printed-circuit board of 5 K/W
[3] The PIP250M meets class 2 for Human Body Model and class M3 for Machine Model.
Table 3: Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol Parameter Conditions Min Max Unit
V
DDC
control circuit supply voltage −0.3 +7 V
V
DDO
output stage supply voltage −0.3 +7 V
V
PHASE
input voltage on PHASE −0.3 +7 V
V
OCSET
input voltage on OCSET −0.3 +7 V
V
FB
input voltage on FB −0.3 +7 V
V
O
output voltage −0.3 +V
DDO
+ 0.3 V
V
CB
bootstrap voltage −0.3 +15 V
I
O(AV)
average output current T
pcb
≤ 110 °C; Figure 6 -15 A
I
ORM
repetitive peak output current t
p
≤ 10 µs; duty cycle ≤ 0.075
[1]
- 200 A
P
tot
total power dissipation T
pcb
=25°C
[2]
-20 W
T
pcb
=90°C
[2]
-7 W
T
j
junction temperature −40 +125 °C
T
stg
storage temperature −55 +150 °C
V
esd
electrostatic discharge voltage human body model; C = 100 pF;
R = 1500 Ω
-2 kV
machine model; C = 200 pF;
R=10Ω; L = 0.75 µH
[3]
- 200 V
Circuit of Figure 9; V
DDC
=5V; V
DDO
=5V; V
O
= 2.5 V.
Fig 6. Average output current as a function of printed-circuit board temperature.
03ak50
0
4
8
12
16
0 50 100 150
T
pcb
(°C)
I
O(AV)
(A)
Philips Semiconductors
PIP250M
Integrated buck converter
Product data Rev. 02 — 21 February 2003 9 of 19
9397 750 10904
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
9. Thermal characteristics
10. Characteristics
Table 4: Thermal characteristics
Symbol Parameter Conditions Min Typ Max Unit
R
th(j-pcb)
thermal resistance from
junction to printed-circuit
board
- 4 5 K/W
R
th(j-a)
thermal resistance from
junction to ambient
device mounted on FR4
printed-circuit board; copper
area around device 25 × 25 mm
no thermal vias - 25 - K/W
with thermal vias - 20 - K/W
with thermal vias and forced
air cooling; airflow = 0.8 ms
-1
(150 LFM)
- 15 - K/W
R
th(j-c)
thermal resistance from
junction to case
measured on upper surface of
package.
- 11 - K/W
Table 5: Characteristics
V
DDC
=5V; T
amb
=25
°
C; circuit of Figure 9 unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
Control circuit supply
V
DDC
control circuit supply voltage −40 °C ≤ T
j
≤ +125 °C-5-V
I
DDC
control circuit supply current - 24 - mA
Power dissipation
P
tot
power dissipation V
DDC
=5V; V
DDO
=5V;
V
O
= 2.5 V; I
O(AV)
=15A;
Figure 7
- 3.6 - W
η efficiency V
DDC
=5V; V
DDO
=5V;
V
O
= 2.5 V; I
O(AV)
=15A;
Figure 8
-88-%
Power-on Reset
V
DDC(th)su
start-up threshold control
circuit supply voltage
V
DDC
increasing;
V
OCSET
= 4.5 V
3.85 4.1 4.35 V
V
DDC(th)sd
shut-down threshold control
circuit supply voltage
V
DDC
decreasing;
V
OCSET
= 4.5 V
3.25 3.7 3.98 V
V
hys
hysteresis V
OCSET
= 4.5 V 0.3 0.5 0.7 V
V
OCSET(th)su
start-up threshold voltage
OCSET
V
OCSET
increasing 0.8 1.25 2.0 V
Reference
V
i(ref)FB
reference voltage measured at FB pin 0.78 0.8 0.82 V
Oscillator
f
osc
oscillator frequency 250 300 350 kHz
V
osc(p-p)
oscillator ramp amplitude
(peak-to-peak value)
- 1.75 - V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

PIP250M,518

Mfr. #:
Buy PIP250M,518
Manufacturer:
NXP Semiconductors
Description:
IC REG BUCK ADJ 15A 68HVQFN
Lifecycle:
New from this manufacturer.
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