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LTC1430AIGN#TRPBF

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1
LTC1430A
High Power Step-Down
Switching Regulator Controller
S
F
EA
T
U
RE
D
U
ESCRIPTIO
The LTC
®
1430A is a high power, high efficiency switching
regulator controller optimized for 5V to 1.xV-3.xV applica-
tions. It includes a precision internal reference and an inter-
nal feedback system that can provide output regulation of
±1% over temperature, load current and line voltage shifts.
The LTC1430A 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 cur-
rent limit without an external low value sense resistor.
The LTC1430A includes a fixed frequency PWM oscillator
for low output ripple under virtually all operating condi-
tions. The 200kHz free-running clock frequency can be
externally adjusted from 100kHz to above 500kHz. The
LTC1430A’s maximum duty cycle is typically 93.5% com-
pared to 88% for the LTC1430. This permits 3.3V to 2.xV
conversion using a low power 5V supply. The LTC1430A
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 LTC1430A supply current to 1µA. For new
designs, refer to the LTC3830.
■
High Power 5V to 1.xV-3.xV Switching Controller:
Can Exceed 10A Output
■
Maximum Duty Cycle > 90% Permits 3.3V to 2.xV
Conversion Using a Low Power 5V Supply
■
All N-Channel External MOSFETs
■
Fixed Frequency Operation—Small L
■
Excellent Output Regulation: ±1% Over Line, Load
and Temperature Variations
■
High Efficiency: Over 95% Possible
■
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-Lead SO and 16-Lead GN
and SO Packages
U
A
O
PP
L
IC
AT
ITY
P
I
CA
L
Efficiency
Typical 5V to 3.3V, 10A Application
+
C
IN
220µF
×4
C
OUT
330µF
×6
+
+
+
2.7µH/15A
PV
CC1
V
CC
FREQSET
SHDN
COMP
SS
PV
CC2
PGND
GND
G1
I
FB
I
MAX
G2NC
1430 TA01
SHUTDOWN
FB NC
Q1A, Q1B, Q2: MOTOROLA MTD20N03HL
C
IN
: AVX-TPSE227M010R0100
C
OUT
: AVX-TPSE337M006R0100
SENSE
+
LTC1430A
SENSE
–
16k
100Ω
R
C
7.5k
C
C
4700pF
C1
220pF
MBR0530T1
1k
0.1µF
1µF
0.01µF
0.1µF
4.7µF
0.1µF
3.3V
10A
Q1A, Q1B
2 IN PARALLEL
Q2
5V
LOAD CURRENT (A)
40
70
100
90
80
50
60
EFFICIENCY (%)
10
1430 TA02
0.1 1
T
A
= 25°C
PV
CC
= 5V
V
OUT
= 3.3V
, LTC and LT are registered trademarks of Linear Technology Corporation.
Pentium is a registered trademark of Intel Corporation.
AMD-K6 is a registered trademark of Advanced Micro Devices, Inc.
U
S
A
O
PP
L
IC
AT
I
■
Power Supply for Pentium
®
II and AMD-K6
®
Microprocessors
■
High Power 5V to 3.xV Regulators
■
Local Regulation for Dual Voltage Logic Boards
■
Low Voltage, High Current Battery Regulation
2
LTC1430A
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
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)
Junction Temperature........................................... 150°C
Operating Temperature Range
LTC1430AC ............................................. 0°C to 70°C
LTC1430AI ........................................ – 40°C to 85°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
WU
U
PACKAGE
/
O
RDER I FOR ATIO
ORDER
PART NUMBER
1
2
3
4
5
6
7
8
TOP VIEW
S PACKAGE
16-LEAD PLASTIC SO
GN PACKAGE
16-LEAD PLASTIC SSOP
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
T
JMAX
= 150°C, θ
JA
= 130°C/W (GN)
T
JMAX
= 150°C, θ
JA
= 110°C/W (S)
1
2
3
4
8
7
6
5
TOP VIEW
G1
PV
CC1
GND
FB
G2
V
CC
/PV
CC2
COMP
SHDN
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C, θ
JA
= 150°C/W
S8 PART MARKING
1430A
LTC1430ACS8
LTC1430ACGN
LTC1430AIGN
LTC1430ACS
ORDER
PART NUMBER
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
LTC1430AC LTC1430AI
SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
V
CC
Supply Voltage ● 4848V
PV
CC
PV
CC1
, PV
CC2
Voltage ● 313313V
V
OUT
Output Voltage Figure 1 3.30 3.30 V
V
FB
Feedback Voltage SENSE
+
and SENSE
–
Floating , ● 1.25 1.265 1.28 1.23 1.265 1.29 V
V
COMP
= 2.5V
∆V
OUT
Output Load Regulation Figure 1, I
OUT
= 0A to 10A 5 5 mV
Output Line Regulation Figure 1, V
CC
= 4.75V to 5.25V 1 1 mV
I
VCC
Supply Current (V
CC
Only) Figure 2, V
SHDN
= V
CC
● 350 700 350 700 µA
V
SHDN
= 0V 1 10 1 10 µA
I
PVCC
Supply Current (PV
CC
) Figure 2, PV
CC
= 5V, V
SHDN
= V
CC
(Note 3) 1.5 1.5 mA
V
SHDN
= 0V 0.1 0.1 µA
f
OSC
Internal Oscillator Frequency FREQSET Floating ● 140 200 260 130 200 300 kHz
V
CC
= 5V, T
A
= 25°C (Note 2) unless otherwise noted.
(Note 1)
3
LTC1430A
V
CC
= 5V, T
A
= 25°C (Note 2) unless otherwise noted.
ELECTRICAL CHARACTERISTICS
LTC1430AC LTC1430AI
SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
V
IH
SHDN Input High Voltage ● 2.4 2.4 V
V
IL
SHDN Input Low Voltage ● 0.8 0.8 V
I
IN
SHDN Input Current ● ±0.1 ±1 ±0.1 ±1 µA
g
mV
Error Amplifier Transconductance ● 350 650 1100 300 650 1200 µmho
g
mI
I
LIM
Amplifier Transconductance (Note 4) 2400 2400 µmho
A
V
Error Amplifier Open-Loop Gain (Note 5) ● 40 48 40 48 dB
I
MAX
I
MAX
Sink Current V
I(MAX)
= V
CC
● 8 12 16 8 12 17 µA
I
SS
Soft Start Source Current V
SS
= 0V ● –8 –12 –16 –8 –12 –17 µA
t
r
, t
s
Driver Rise/Fall Time Figure 3, PV
CC1
= PV
CC2
= 5V 80 250 80 250 ns
t
NOV
Driver Non-Overlap Time Figure 3, PV
CC1
= PV
CC2
= 5V 25 130 250 25 130 250 ns
DC
MAX
Maximum Duty Cycle Figure 3, V
COMP
= V
CC
, ● 90 93.5 89 93.5 %
V
FB
= 1.265V
The ● denotes specifications which apply over the full operating
temperature range.
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: Supply current in normal operation is dominated by the current
needed to charge and discharge the external FET gates. This will vary with
the LTC1430A operating frequency, operating voltage and the external
FETs used.
Note 4: The I
LIM
amplifier can sink but cannot source current. Under
normal (not current limited) operation, the I
LIM
output current will be zero.
Note 5: The open-loop DC gain and transconductance from the FB pin
(SENSE
+
and SENSE
–
floating) to COMP pin will be A
V
and gm
V
respectively.
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LTC1430AIGN#TRPBF

Mfr. #:
Buy LTC1430AIGN#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Hi Pwr Buck Sw Reg Cntr
Lifecycle:
New from this manufacturer.
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