參數(shù)資料
型號(hào): PIP250M
英文描述: Integrated buck converter
中文描述: 集成的降壓轉(zhuǎn)換器
文件頁(yè)數(shù): 9/19頁(yè)
文件大?。?/td> 334K
代理商: PIP250M
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:
Symbol
R
th(j-pcb)
Thermal characteristics
Parameter
thermal resistance from
junction to printed-circuit
board
thermal resistance from
junction to ambient
Conditions
Min
-
Typ
4
Max
5
Unit
K/W
R
th(j-a)
device mounted on FR4
printed-circuit board; copper
area around device 25
×
25 mm
no thermal vias
with thermal vias
with thermal vias and forced
air cooling; airflow = 0.8 ms
-1
(150 LFM)
measured on upper surface of
package.
-
-
-
25
20
15
-
-
-
K/W
K/W
K/W
R
th(j-c)
thermal resistance from
junction to case
-
11
-
K/W
Table 5:
V
DDC
= 5 V; T
amb
= 25
°
C; circuit of
Figure 9
unless otherwise specified.
Symbol
Parameter
Control circuit supply
V
DDC
control circuit supply voltage
40
°
C
T
j
+125
°
C
I
DDC
control circuit supply current
Power dissipation
P
tot
power dissipation
Characteristics
Conditions
Min
Typ
Max
Unit
-
-
5
24
-
-
V
mA
V
DDC
= 5 V; V
DDO
= 5 V;
V
O
= 2.5 V; I
O(AV)
= 15 A;
Figure 7
V
DDC
= 5 V; V
DDO
= 5 V;
V
O
= 2.5 V; I
O(AV)
= 15 A;
Figure 8
-
3.6
-
W
η
efficiency
-
88
-
%
Power-on Reset
V
DDC(th)su
start-up threshold control
circuit supply voltage
shut-down threshold control
circuit supply voltage
hysteresis
V
OCSET(th)su
start-up threshold voltage
OCSET
Reference
V
i(ref)FB
reference voltage
Oscillator
f
osc
oscillator frequency
V
osc(p-p)
oscillator ramp amplitude
(peak-to-peak value)
V
DDC
increasing;
V
OCSET
= 4.5 V
V
DDC
decreasing;
V
OCSET
= 4.5 V
V
OCSET
= 4.5 V
V
OCSET
increasing
3.85
4.1
4.35
V
V
DDC(th)sd
3.25
3.7
3.98
V
V
hys
0.3
0.8
0.5
1.25
0.7
2.0
V
V
measured at FB pin
0.78
0.8
0.82
V
250
-
300
1.75
350
-
kHz
V
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