LTC3414 - 4A、4MHzモノリシック同期整流式降圧

LTC3414
®
■
■
■
µ
■
Ω
■
Ω
■
■
■
■
®
®
■
■
■
■
■
■
■
■
■
VIN
2.7V TO 5.5V
22µF
100
PVIN SVIN
RITH*
0.47µH
LTC3414
294k
1000pF
95
PGOOD
VOUT
2.5V AT 4A
SW
RUN/SS
PGND
ITH
SGND
VFB
SYNC/MODE
COUT*
85
80
75
FORCED
CONTINUOUS
70
65
470pF
60
110k
392k
55
75k
3414 F01a
*
Burst Mode OPERATION
90
EFFICIENCY (%)
RT
2.2M
COUT = 470µF SANYO POSCAP 4TPB470M, RITH = 20k
COUT = (2) 100µF TDKC4532X5ROJ107M, RITH = 12.1k
50
0.001
0.01
0.1
1.0
LOAD CURRENT (A)
10
3414 F01b
3414f
1
LTC3414
TOP VIEW
PGND 1
RT 2
19 VFB
SYNC/MODE 3
18 ITH
RUN/SS 4
SGND 5
ORDER PART
NUMBER
20 PGND
LTC3414EFE
17 PGOOD
21
NC 6
16 SVIN
15 NC
PVIN 7
14 PVIN
SW 8
13 SW
SW 9
12 SW
PGND 10
11 PGND
FE PACKAGE
20-LEAD PLASTIC TSSOP
EXPOSED PAD (PIN 21)
MUST BE SOLDERED TO PCB
TJMAX = 125°C, θJA = 38°C/W, θJC = 10°C/W
●
SYMBOL
VIN
IFB
VFB
∆VFB
VLOADREG
PARAMETER
Input Voltage Range
Feedback Pin Input Current
Regulated Feedback Voltage
Reference Voltage Line Regulation
Output Voltage Load Regulation
∆VPGOOD
RPGOOD
IQ
Power Good Range
Power Good Resistance
Input DC Bias Current
Active Current
Sleep
Shutdown
Switching Frequency
Switching Frequency Range
SYNC Capture Range
RDS(ON) of P-Channel FET
RDS(ON) of N-Channel FET
Peak Current Limit
Undervoltage Lockout Threshold
SW Leakage Current
RUN Threshold
fOSC
fSYNC
RPFET
RNFET
ILIMIT
VUVLO
ILSW
VRUN
CONDITIONS
(Note 3)
(Note 3)
VIN = 2.7V to 5.5V (Note 3)
Measured in Servo Loop, VITH = 0.36V
Mesured in Servo Loop, VITH = 0.84V
(Note 4)
VFB = 0.75V, VITH = 1.2V
VFB = 1V, VITH = 0V, VSYNC/MODE = 0V
VRUN = 0V
ROSC = 294k
TYP
●
MIN
2.25
●
0.784
0.800
0.04
0.02
–0.02
±7.5
120
●
●
●
0.88
0.3
0.3
ISW = 300mA
ISW = –300mA
6
1.75
VRUN = 0V, VIN = 5.5V
0.5
250
64
0.02
1.00
67
50
8
2.00
0.1
0.65
MAX
5.5
0.2
0.816
0.2
0.2
–0.2
±9
200
UNITS
V
µA
V
%V
%
%
%
Ω
330
100
1
1.12
4
4
100
100
µA
µA
µA
MHz
MHz
MHz
mΩ
mΩ
A
V
µA
V
2.25
1.0
0.8
3414f
2
LTC3414
120
90
0.800
TA = 25°C
80
0.797
ON-RESISTANCE (mΩ)
0.798
100
PFET
70
ON-RESISTANCE (mΩ)
VREF (V)
0.799
60
NFET
50
40
30
20
0.796
80
PFET
NFET
60
40
20
10
0.795
–40 –20
0
0
2.25 2.75 3.25 3.75 4.25 4.75 5.25
INPUT VOLTAGE (V)
20 40 60 80 100 120 140
TEMPERATURE (°C)
7000
TA = 25°C
14
PFET
12
10
8
6
5000
4000
3000
2000
NFET
1000
980
960
940
4
920
1000
2
5.25
25 125 225 325 425 525 625 725 825 925
ROSC (k)
3414 G04
350
VIN = 3.3V
ROSC = 294k
QUIESCENT CURRENT (µA)
1030
1010
990
970
950
ACTIVE
250
200
150
100
SLEEP
50
930
910
–40 –20
0
20 40 60 80
TEMPERATURE (°C)
100 120
3414 G07
0
2.25
2.75
3.25 3.75 4.25 4.75
INPUT VOLTAGE (V)
5.25
3414 G08
5.25
3414 G06
5.0
TA = 25°C
300
1050
2.75 3.25 3.75 4.25 4.75
INPUT VOLTAGE (V)
3414 G05
1090
1070
900
2.25
0
2.75 3.25 3.75 4.25 4.75
INPUT VOLTAGE (V)
MINIMUM PEAK INDUCTOR CURRENT (A)
0
2.25
FREQUENCY (kHz)
ROSC = 294k
TA = 25°C
1020
FREQUENCY (kHz)
16
1040
VIN = 3.3V
TA = 25°C
6000
FREQUENCY (kHz)
SWITCH LEAKAGE CURRENT (nA)
18
3414 G03
3414 G02
3414 G01
20
0
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
5.75
VIN = 3.3V
TA = 25°C
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
0.1
0.2 0.3 0.4 0.5 0.6 0.7
BURST CLAMP VOLTAGE (V)
0.8
3414 G09
3414f
3
LTC3414
95
80
VIN = 5V
EFFICIENCY (%)
85
80
75
70
100
VOUT = 2.5V
90 TA = 25°C
VIN = 3.3V
90
EFFICIENCY (%)
100
TA = 25°C
90
VIN = 3.3V
70
VIN = 5V
60
50
40
75
70
65
60
20
60
55
10
55
0.01
0.1
1
LOAD CURRENT (A)
0
0.001
10
0.01
0.1
1
LOAD CURRENT (A)
IOUT = 1A
94
VIN = 3.3V
VOUT = 2.5V
50
0.001
10
0.01
0.1
1
LOAD CURRENT (A)
3414 G11
98
96
FORCED
CONTINUOUS
80
30
3414 G10
100
VOUT = 2.5V
TA = 25°C
95
10
3414 G12
0
VIN = 3.3V
VOUT = 2.5V
TA = 25°C
L = 1µH
VIN = 3.3V
VOUT = 2.5V
TA = 25°C
–0.05
L = 0.47µH
90
88
IOUT = 4A
86
84
82
90
∆VOUT/VOUT (%)
EFFICIENCY (%)
92
EFFICIENCY (%)
85
65
50
0.001
TA = 25°C
Burst Mode OPERATION
95
EFFICIENCY (%)
100
L = 0.2µH
85
80
–0.10
–0.15
–0.20
75
–0.25
70
300 800 1300 1800 2300 2800 3300 3800
FREQUENCY (kHz)
–0.30
80
78
2.5
3.0
4.0
4.5
3.5
INPUT VOLTAGE (V)
5.0
5.5
3414 G13
OUTPUT
VOLTAGE
100mV/DIV
INDUCTOR
CURRENT
500mA/DIV
INDUCTOR
CURRENT
2A/DIV
VIN = 3.3V, VOUT = 2.5V
LOAD = 250mA
0.5
1.0
1.5 2.0 2.5 3.0
LOAD CURRENT (A)
3414 G14
OUTPUT
VOLTAGE
20mV/DIV
10µs/DIV
0
3414 G16
3.5
4.0
3414 G15
20µs/DIV
3414 G17
VIN = 3.3V, VOUT = 2.5V
LOAD STEP = 0A TO 4A
3414f
4
LTC3414
OUTPUT
VOLTAGE
100mV/DIV
VRUN
OUTPUT
VOLTAGE
INDUCTOR
CURRENT
2A/DIV
INDUCTOR
CURRENT
2A/DIV
20µs/DIV
VIN = 3.3V, VOUT = 2.5V
LOAD STEP = 250mA TO 4A
3414 G18
1ms/DIV
VIN = 3.3V, VOUT = 2.5V
LOAD = 4A
3414 G19
µ
3414f
5
LTC3414
0.8V
SVIN
SGND
ITH
EXPOSED PAD
PVIN
PVIN
16
5
18
21
7
14
PMOS CURRENT
COMPARATOR
SLOPE
COMPENSATION
RECOVERY
VOLTAGE
REFERENCE
+
BCLAMP
+
–
VFB 19
–
0.74V
+
ERROR
AMPLIFIER
SYNC/MODE
–
+
V
SLOPE
COMPENSATION
BURST
COMPARATOR
+
OSCILLATOR
–
4
LOGIC
RUN
SW
9
SW
12 SW
–
RUN/SS
NMOS CURRENT
COMPARATOR
8
13 SW
+
+
0.86V
CURRENT
REVERSAL
COMPARTOR
–
PGOOD 17
1
PGND
+
10 PGND
–
11 PGND
2
3
20
RT
SYNC/MODE
PGND
3414 BD
3414f
6
LTC3414
µ
3414f
7
LTC3414
 V


V
L =  OUT   1 – OUT 
 f∆IL(MAX)   VIN(MAX) 
ROSC =
3.08 • 1011
Ω – 10kΩ
f
( )
•
•
∆
V  V 
∆IL =  OUT   1– OUT 
VIN 
 fL  
∆
3414f
8
LTC3414
IRMS = IOUT (MAX)
VOUT
VIN
VIN
–1
VOUT
∆

1 
∆VOUT ≤ ∆IL  ESR +
8fC OUT 

∆
 R2
VOUT = 0.8V  1 + 
 R1
VOUT
R2
VFB
LTC3414
R1
SGND
3414 F02
3414f
9
LTC3414
 6.9A 
IBURST = 
 VBURST – 0.383V
 0.6V 
(
)
µ

VIN 
tSS = RSS C SS ln 
 (SECONDS)
 VIN – 1.8V 
3414f
10
LTC3414
tr = (PD)(θJA)
θ
θ
TJ = TA + tr
RSW = (RDS(ON)TOP)(DC) + (RDS(ON)BOT)(1 – DC)
∆
∆
3414f
11
LTC3414
 6.9A 
IBURST = VBURST – 0.383V 
 = 1.23A
 0.6V 
(
)
R2 + R3 = 200k
1+
ROSC =
3.08 • 1011
1• 106
R2 0.8V
=
R3 0.49V
– 10k = 298k
R1
2.5V
=
202.7k 0.8V
R1 = 432k
1+

  2.5V 
2.5V
L=
 = 0.63µH
 1–
 (1MHz)(1.6A)  4.2V 
µ

  2.5V 
2.5V
∆IL = 
 = 2.15A
 1–
 (1MHz)(0.47µH)  4.2V 
µ
µ
 2.5V  4.2V
IRMS = (4A)
– 1 = 1.96ARMS

 4.2V  2.5V
µ
µ
3414f
12
LTC3414
1
ROSC
294k 2
3
RSS
2.2M
CSS
1000pF
X7R
4
5
6
7
8
+
CIN2***
330µF
9
10
PGND
PGND
VFB
RT
ITH
SYNC/MODE
RUN/SS
PGOOD
SVIN
SGND
C1
10pF
X7R
20
19
18
R3
124k
CITH
470pF
X7R
R2
78.7k
RITH
20k
R1
432k
17
16
PGOOD
RPG
100k
LTC3414
NC
PVIN
NC
PVIN
SW
SW
SW
SW
PGND
PGND
VIN
2.7V TO 5V
CIN1
22µF
X5R
2X
15
14
13
12
11
L1*
0.47µH
COUT2
22µF
X5R
VOUT
2.5V
4A
+
COUT1**
470µF
3413 F04
* VISHAY DALE IHLP-2525CZ-01
** SANYO POSCAP 4TPD470M
*** SANYO POSCAP 6TPB330M
3414f
13
LTC3414
1
ROSC
294k 2
3
RSS
2.2M
4
CSS
1000pF
X7R
5
6
7
8
+
CIN2***
150µF
9
10
PGND
PGND
RT
VFB
SYNC/MODE
ITH
PGOOD
RUN/SS
SVIN
SGND
20
19
18
CC
100pF
X7R
CITH
470pF
X7R
RITH
12.1k
R1
634k
17
NC
PVIN
PVIN
SW
SW
SW
SW
PGND
PGND
16
CIN1
22µF
X5R
2x
15
L1*
0.68µH
13
VOUT
3.3V
4A
12
COUT**
100µF
2x
11
3413 F05
1
ROSC
294k 2
PGND
PGND
VFB
RT
1.25MHz 3
SYNC/MODE
CLOCK
CSS
1000pF
X7R
4
5
6
7
8
+
CIN2***
220µF
9
10
* VISHAY DALE IHLP-2525CZ-01
** TDK C4532X5ROJ107M
*** SANYO POSCAP 4TPB220M
VIN
5V
14
* MURATA LQH66SNR68M03L
** TDK C4532X5ROJ107M
*** SANYO POSCAP 6TPE150M
RSS
2.2M
C1
22pF
X7R
PGOOD
RPG
100k
LTC3414
NC
R2
200k
RUN/SS
ITH
PGOOD
SVIN
SGND
20
19
18
CC
100pF
X7R
CITH
470pF
X7R
RITH
12.1k
R1
422k
17
16
PVIN
NC
PVIN
SW
SW
SW
SW
PGND
PGND
C1
22pF
X7R
PGOOD
RPG
100k
VIN
3.3V
CIN1**
100µF
2x
LTC3414
NC
R2
200k
15
14
13
12
11
L1*
0.47µH
VOUT
2.5V
4A
COUT**
100µF
2x
3413 F06
3414f
14
LTC3414
(Reference LTC DWG # 05-08-1663)
6.40 – 6.60*
(.252 – .260)
4.95
(.195)
4.95
(.195)
20 1918 17 16 15 14 13 12 11
6.60 ±0.10
2.74
(.108)
4.50 ±0.10
2.74 6.40
(.108) BSC
SEE NOTE 4
0.45 ±0.05
1.05 ±0.10
0.65 BSC
1 2 3 4 5 6 7 8 9 10
RECOMMENDED SOLDER PAD LAYOUT
1.20
(.047)
MAX
4.30 – 4.50*
(.169 – .177)
0° – 8°
0.09 – 0.20
(.0036 – .0079)
0.45 – 0.75
(.018 – .030)
NOTE:
1. CONTROLLING DIMENSION: MILLIMETERS
MILLIMETERS
2. DIMENSIONS ARE IN
*
(INCHES)
3. DRAWING NOT TO SCALE
0.65
(.0256)
BSC
0.195 – 0.30
(.0077 – .0118)
0.05 – 0.15
(.002 – .006)
FE20 (CA) TSSOP 0203
4. RECOMMENDED MINIMUM PCB METAL SIZE
FOR EXPOSED PAD ATTACHMENT
*DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.150mm (.006") PER SIDE
3414f
15
LTC3414
1
ROSC
294k 2
3
RSS
2.2M
4
CSS
1000pF, X7R
5
6
7
+
8
CIN2**
470µF
9
10
PGND
PGND
RT
VFB
SYNC/MODE
RUN/SS
ITH
PGOOD
SGND
SVIN
LTC3414
NC
PVIN
NC
PVIN
SW
SW
SW
SW
PGND
PGND
20
19
18
CC
100pF
X7R
CITH
470pF
X7R
R2
200k
RITH
15k
C1
39pF
X7R
R1
178k
17
PGOOD
RPG
100k
16
15
14
L1*
0.44µH
13
12
VOUT
1.5V
4A
+
COUT2
22µF
X5R
11
VIN
2.5V
CIN1
22µF
X5R
2x
* PULSE P1166.68IT
** SANYO POSCAP 4TPD470M
COUT1**
470µF
3413 TA01
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
3414f
16
1003 0.2K • PRINTED IN JAPAN
•
•
 LINEAR TECHNOLOGY CORPORATION 2003