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LTC1430CS8#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LTC1430
High Power Step-Down
Switching Regulator Controller
The LTC
®
1430 is a high power, high efficiency switching
regulator controller optimized for 5V to 3.xV applications.
It includes a precision internal reference and an internal
feedback system that can provide output regulation of ±1%
over temperature, load current and line voltage shifts. The
LTC1430 uses a synchronous switching architecture with
two N-channel output devices, eliminating the need for a
high power, high cost P-channel device. Additionally, it
senses output current across the drain-source resistance
of the upper N-channel FET, providing an adjustable
current limit without an external low value sense resistor.
The LTC1430 includes a fixed frequency PWM oscillator for
low output ripple under virtually all operating conditions.
The 200kHz free-running clock frequency can be externally
adjusted from 100kHz to above 500kHz. The LTC1430
features low 350µA quiescent current, allowing greater
than 90% efficiency operation in converter designs from
1A to greater than 50A output current. Shutdown mode
drops the LTC1430 supply current to 1µA. For new
designs, refer to the LTC3830.
■
High Power 5V to 3.xV Switching Controller:
Can Exceed 10A Output
■
All N-Channel External MOSFETs
■
Constant Frequency Operation—Small Inductor
■
Excellent Output Regulation: ±1% Over Line, Load
and Temperature Variations
■
High Efficiency: Over 95% Possible
■
Fixed Frequency Operation
■
No Low Value Sense Resistor Needed
■
Outputs Can Drive External FETs with Up to
10,000pF Gate Capacitance
■
Quiescent Current: 350µA Typ, 1µA in Shutdown
■
Fast Transient Response
■
Adjustable or Fixed 3.3V Output
■
Available in 8- and 16-Lead PDIP and SO Packages
, LTC and LT are registered trademarks of Linear Technology Corporation.
LOAD CURRENT (A)
40
70
100
90
80
50
60
EFFICIENCY (%)
10
LTC1430 • TA02
0.1 1
T
A
= 25°C
V
IN
= 5V
V
OUT
= 3.3V
Efficiency
+
C
IN
220µF
×4
C
OUT
330µF
×6
+
+
+
L1, 2.8µH
PV
CC1
V
CC
FREQSET
SHDN
COMP
SS
PV
CC2
PGND
GND
G1
I
FB
I
MAX
G2NC
LTC1430 • TA01
SHUTDOWN
FB NC
C
IN
: AVX-TPSE227M010R0100
C
OUT
: AVX-TPSE337M006R0100
L1: ETQP6F1R6SFA
M1A, M1B, M2: MOTOROLA MTD20N03HL
SENSE
+
LTC1430
SENSE
–
16k
100Ω
R
C
7.5k
C
C
4700pF
C1
220pF
1N4148
1k
0.1µF
1µF
0.01µF
0.1µF
4.7µF
0.1µF
3.3V
10A
M1A, M1B
2 IN PARALLEL
M2
V
IN
5V
Typical 5V to 3.3V, 10A Application
■
Power Supply for P6 and Pentium
®
Microprocessors
■
High Power 5V to 3.xV Regulators
■
Local Regulation for Dual Voltage Logic Boards
■
Low Voltage, High Current Battery Regulation
Pentium is a registered trademark of Intel Corporation.
APPLICATIO S
U
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
2
LTC1430
Supply Voltage
V
CC
....................................................................... 9V
PV
CC1, 2
.............................................................. 13V
Input Voltage
I
FB
......................................................... –0.3V to 18V
All Other Inputs ...................... –0.3V to (V
CC
+ 0.3V)
Operating Temperature Range
LTC1430C .............................................. 0°C to 70°C
LTC1430I........................................... –40°C to 85°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
ORDER
PART NUMBER
ORDER
PART NUMBER
LTC1430CN
LTC1430CS
LTC1430IS
LTC1430CN8
LTC1430CS8
S8 PART MARKING
1430
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Supply Voltage ● 48V
PV
CC
PV
CC1
, PV
CC2
● 13 V
V
OUT
Output Voltage Figure 1 ● 3.30 V
V
FB
Feedback Voltage Figure 1, SENSE
+
and SENSE
–
Floating (LTC1430C) ● 1.25 1.265 1.28 V
Figure 1, SENSE
+
and SENSE
–
Floating (LTC1430I) ● 1.23 1.265 1.29 V
∆V
OUT
Output Load Regulation Figure 1, I
OUT
= 0A to 10A (Note 3) (LTC1430C) ● 520 mV
Figure 1, I
OUT
= 0A to 10A (Note 3) (LTC1430I) 5 mV
Output Line Regulation Figure 1, V
CC
= 4.75V to 5.25V (Note 3) (LTC1430C) ● 15 mV
Figure 1, V
CC
= 4.75V to 5.25V (Note 3) (LTC1430I) 1 mV
IV
CC
Supply Current (V
CC
Only) Figure 2, V
SHDN
= V
CC
● 350 700 µA
V
SHDN
= 0V 1 10 µA
IPV
CC
Supply Current (PV
CC
) Figure 2, PV
CC
= 5V, V
SHDN
= V
CC
(Note 4) 1.5 mA
V
SHDN
= 0V 0.1 µA
f
OSC
Internal Oscillator Frequency FREQSET Floating (LTC1430C) ● 140 200 260 kHz
FREQSET Floating (LTC1430I)
● 130 200 300 kHz
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V unless otherwise noted. (Note 2)
Consult factory for Industrial and Military grade parts.
T
JMAX
= 150°C, θ
JA
= 100°C/W (N8)
T
JMAX
= 150°C, θ
JA
= 150°C/W (S8)
1
2
3
4
8
7
6
5
TOP VIEW
G1
PV
CC1
GND
FB
G2
V
CC
/PV
CC2
COMP
SHDN
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C, θ
JA
= 70°C/W (N)
T
JMAX
= 150°C, θ
JA
= 110°C/W (S)
1
2
3
4
5
6
7
8
TOP VIEW
S PACKAGE
16-LEAD PLASTIC SO
N PACKAGE
16-LEAD PDIP
16
15
14
13
12
11
10
9
G1
PV
CC1
PGND
GND
SENSE
–
FB
SENSE
+
SHDN
G2
PV
CC2
V
CC
I
FB
I
MAX
FREQSET
COMP
SS
(Note 1)
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
ELECTRICAL CHARACTERISTICS
3
LTC1430
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to ground unless otherwise
specified.
Note 3: This parameter is guaranteed by correlation and is not tested
directly.
Note 4: Supply current in normal operation is dominated by the current
needed to charge and discharge the external FET gates. This will vary with
the LTC1430 operating frequency, operating voltage and the external FETs
used.
Note 5: The I
LIM
amplifier can sink but cannot source current. Under
normal (not current limited) operation, the I
LIM
output current will be zero.
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V unless otherwise noted. (Note 2)
ELECTRICAL CHARACTERISTICS
V
IH
SHDN Input High Voltage ● 2.4 V
V
IL
SHDN Input Low Voltage ● 0.8 V
I
IN
SHDN Input Current ● ±0.1 ±1 µA
A
V
Error Amplifier Open-Loop DC Gain (LTC1430I) ● 40 48 dB
gm
V
Error Amplifier Transconductance (LTC1430C) 650 µMho
(LTC1430I)
● 300 650 1200 µMho
gm
I
I
LIM
Amplifier Transconductance (Note 5) 1300 µMho
I
MAX
I
MAX
Sink Current V
I(MAX)
= V
CC
(LTC1430C) ● 81216 µA
V
I(MAX)
= V
CC
(LTC1430I) ● 81217 µA
I
SS
Soft-Start Source Current V
SS
= 0 (LTC1430C) ● –8 –12 –16 µA
V
SS
= 0 (LTC1430I) ● –8 –12 –17 µA
t
r
, t
s
Driver Rise/Fall Time Figure 3, PV
CC1
= PV
CC2
= 5V 80 250 ns
t
NOV
Driver Non-Overlap Time Figure 3, PV
CC1
= PV
CC2
= 5V 25 130 250 ns
DC
MAX
Maximum Duty Cycle V
COMP
= V
CC
(LTC1430C) ● 90 96 %
V
COMP
= V
CC
, V
FB
= 0 (LTC1430I) ● 90 96 %
V
COMP
= V
CC
, V
FB
= 1.265V (LTC1430I) ● 83 88 %
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC1430CS8#PBF

Mfr. #:
Buy LTC1430CS8#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Hi Pwr Buck Sw Reg Cntr
Lifecycle:
New from this manufacturer.
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