Philips Semiconductors
PIP250M
Integrated buck converter
Product data Rev. 02 — 21 February 2003 10 of 19
9397 750 10904
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
Error amplifier
G
ol
open loop gain - 35 - dB
GB Gain bandwidth product - 17 - MHz
Overvoltage, overcurrent and undervoltage protection
V
FB(th)OV
overvoltage threshold
feedback voltage
voltage on FB increasing 1.0 1.1 - V
V
FB(th)UV
undervoltage threshold
feedback voltage
voltage on FB decreasing - 0.5 0.6 V
I
OCSET
OCSET sink current V
OCSET
= 4.5 V 35 40 45 µA
t
D(OC)
overcurrent trip delay - 30 - µs
t
D(UV)
undervoltage trip delay - 30 - µs
t
SS
soft start interval - 2 - ms
Table 5: Characteristics
…continued
V
DDC
=5V; T
amb
=25
°
C; circuit of Figure 9 unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
See circuit of Figure 9.
V
DDC
=5V; V
DDO
=5V; V
O
= 2.5 V
See circuit of Figure 9.
(1) V
O
= 3.3 V
(2) V
O
= 2.5 V
(3) V
O
= 1.8 V
(4) V
O
= 1.5 V
(5) V
O
= 1.2 V
Fig 7. Total power dissipation as a function of average
output current; typical values.
Fig 8. Total solution efficiency as a function of
average output current; typical values.
03ak51
0
1
2
3
4
0 4 8 12 16
I
O(AV)
(A)
P
tot
(W)
03al76
75%
80%
85%
90%
95%
100%
257101215
I
O(AV)
(A)
η
(%)
(1)
(2)
(3)
(4)
(5)
