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Электронный компонент: IP1203

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iP1203 .pmd
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iP1203 Power Block
04/08/05
iP1203 Simplified Application Schematic
Description
The iP1203 is a fully optimized solution for medium current synchronous buck applications requiring up to 15A.
It includes full function PWM control, with optimized power semiconductor chipsets and associated passives,
achieving high power density. Very few external components are required to create a complete synchronous
buck power supply.
iPOWIR
TM
technology offers designers an innovative space-saving solution for applications requiring high
power densities. iPOWIR technology eases design for applications where component integration offers benefits
in performance and functionality. iPOWIR technology solutions are also optimized internally for layout, heat
transfer and component selection.
5.5V to 13.2V Input Voltage
0.8V to 8V Output Voltage
15A Maximum Load Capability
200-400kHz Nominal Switching Frequency
Over Current Hiccup
External Synchronization Capable
Overvoltage Protection
Over Temperature Protection
Internal Features Minimize Layout Sensitivity
Very Small Outline 9mm x 9mm x 2.3mm
Features
Single Output Full Function
Synchronous Buck Power Block
Integrated Power Semiconductors,
PWM Control & Passives
iP1203
V
SS
PG
N
D
FB
FB
CC
PGOOD
R
SYNC
OC
V
iP1203
V
SS
PG
N
D
FB
FB
CC
PGOOD
R
SYNC
OC
V
V
V
OUT
IN
CC_bypass
T
SW
REF
V
V
S
IN
Pin Number
(See Page 18) Pin Name
Pin Description
1, 23
V
IN
Input voltage connection pins
2,3,4,5,7,17,20,21
PGND
Power Ground pins
6
V
CC_bypass
PWM controller power supply pin. Internally generated.
Requires a 2.2f external bypass capacitor
8
SS
Soft start pin. External capacitor provides soft start. Pulling soft start pin low
will disable the output. Cannot be cycled to unlatch OVP trip
9
CC
Output of the error amplifier
10
FB
Inverting input of the error amplifier
11
FB
s
Output overvoltage sense pin.
12
R
T
Switching frequency setting pin. For R
T
selection, refer to Fig.9 of the
datasheet
13
PGOOD
Power Good pin. Open collector, requires external pulll-up. If function not
needed, pin can be left floating
14
V
REF
Non inverting input of the error amplifier (reference Voltage pin). Connect a
100pF cap from this pin to PGND.
15
SYNC
External Clock synchronization pin. Set free running frequency to 80% of
the SYNC frequency. When not in use, leave pin floating
16
OCSET
Output overcurrent trip threshold pin
18,19
V
SW
Output inductor connection pins
22
V
SWs
Test pad, for internal use, short to VSW
24
V
INs
Test pad, for internal use, short to V
IN
PD- 96921C
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2
iP1203
Absolute Maximum Ratings
Recommended Operating Conditions
Electrical Specifications @ V
IN
= 12V
All specifications @ 25C (unless otherwise specified)
Parameter
Symbol
Min
Typ
Max
Units
Conditions
V
IN
V
IN
-0.3
15
Feedback
FB
-0.3
6
Output Overvoltage Sense
FB
S
-0.3
6
PGOOD
-0.3
15
Soft Start
SS
-0.3
6
SYNC
-0.3
6
Output RMS Current
Iout
VSW
15
A
See Fig.3
Block Temperature
T
BLK
-10
125
C
V
Parameter
Symbol
Min
Typ
Max
Units
Conditions
Input Voltage Range
V
IN
5.5
13.2
V
15
A
T
PCB
= T
CASE
= 90C. See Fig.3
11
A
T
PCB
= 90C, T
CASE
= no airflow, no
heatsink.
0.8
8.0
For V
IN
= 12V
0.8
3.3
For V
IN
= 5.5V
Output Voltage Range
V
OUT
V
Output RMS Current
Iout
VSW
Parameter
Symbol
Min
Typ
Max
Units
Conditions
Over Current Shutdown
I
OC
25
A
V
IN
= 12V, V
OUT
= 1.5V
f
SW
= 300KHz, R
OCSET
= 40.2k
HICCUP Duty Cycle
D
HICCUP
5
%
Soft Start Time
t
SS
5
ms
V
IN
= 12V, V
OUT
= 1.5V,
C
SS
=0.1F
Reference Voltage
V
REF
0.8
V
V
OUT_ACC1
-3
3
T
BLK
= -10C to 125C
V
IN
= 12V, V
OUT
= 1.5V
V
OUT_ACC2
-2
2
T
BLK
= 0C to 70C
V
IN
= 12V, V
OUT
= 1.5V
Error Amplifier
Source/Sink Current
I
ERR
60
A
Error Amplifier
Transconductance
g
m
2000
mho
Output Overvoltage Shutdown
Threshold
OVP
1.1 x V
OUT
1.15 x V
OUT
1.2 x V
OUT
V
PGOOD Trip Threshold
V
Th_PGOOD
0.85 x V
OUT
V
FB ramping down
PGOOD Output Low Voltage
V
LO_PGOOD
0.3
V
I
SINK
=2mA
%
V
OUT
Accuracy
W
P
LOSS
Power Loss
f
SW =
300kHz, V
IN
= 12V, T
BLK
= 25C
V
OUT
= 1.5V, I
OUT
= 15A, See Fig.10
3.75
4.9
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3
iP1203
Electrical Specifications (continued)
Parameter
Symbol
Min
Typ
Max
Units
Conditions
170
230
kHz
R
T
= 48.7k
Frequency
f
SW
255
345
kHz
R
T
= 30.9k
340
460
kHz
R
T
= 21.5k
SYNC Frequency Range
f
SYNC
480
800
kHz
Free running frequency
set 20% below sync frequency
SYNC Pulse Duration
t
SYNC
200
ns
SYNC, High Level
Threshold Voltage
2
V
SYNC, Low Level
Threshold Voltage
0.8
V
V
IN
Quiescent Current
I
IN-LEAKAGE
25
35
mA
V
IN
= 12V
Thermal Shutdown
Temp
shdn
140
C
Max Duty Cycle
D
MAX
85
%
f
SW
= 200kHz, T
BLK
= 25C
V
IN
Undervoltage Lockout
Threshold Voltage
V
IN-UVLO
4.5
V
V
IN
ramping up to 12V
V
IN
Undervoltage Lockout
Hysteresis
V
IN-UVLO HYST
0.25
V
V
IN
ramp up and ramp down
Output Disable Voltage Soft
Start Low Threshold Voltage
V
SS-DIS
0.25
V
SS Pin Pulled Low
Input Voltage Slew Rate
V
IN-SLEW
50
mV/s
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iP1203
Fig. 1: iP1203 Internal Block Diagram
H
i
c
c
up
Con
t
r
o
l
OC La
t
c
h
/
P
G
ood
OVP
(-
10%
)
(+
15%
)
Bia
s
Gen
e
r
a
t
o
r
SS
OC
S
E
T
FB
CC
S
YNC
R
V
FB
25uA
25k
25k
E
rro
r A
m
p
0.8V
PW
M
Co
m
p
R
S
Q
Ra
mp
SW
1
SW
2
P
G
OOD
V
SW
2
SW
1
0.8V
20k
UV
L
O
3uA
V
PW
M
PGN
D
64uA
O
s
c
ilato
r
Dr
i
v
er
V
IN
CC
SW
RE
F
T
S
byp
a
s
s
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5
iP1203
Fig. 2: Power Loss vs. Current
Fig. 3: Safe Operating Area (SOA) vs. T
PCB
& T
CASE
0
10
20
30
40
50
60
70
80
90
100
110
120
130
Case Temperature (C)
0
10
20
30
40
50
60
70
80
90
100
110
120
130
PCB Temperature (C)
0
2
4
6
8
10
12
14
16
O
u
t
p
u
t

C
u
r
r
e
n
t

(
A
)
Safe
Operating
Area
VIN = 12V
VOUT = 1.5V
fsw = 300kHz
L = 1.0H
Tx
0
5
10
15
Output Current (A)
0
1
2
3
4
5
6
P
o
w
e
r

L
o
s
s

(
W
)
Maximum
Typical
VIN = 12V
VOUT = 1.5V
fsw = 300kHz
L = 1.0H
TBLK = 125C