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LTC1430AIGN Datasheet

  • LTC1430AIGN

  • High Power Step-Down Switching Regulator Controller

  • 24頁(yè)

  • LINER

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LTC1430A
High Power Step-Down
Switching Regulator Controller
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
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鈥擲mall L
Excellent Output Regulation:
鹵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: 350碌A(chǔ) Typ, 1碌A(chǔ) in Shutdown
Fast Transient Response
Adjustable or Fixed 3.3V Output
Available in 8-Lead SO and 16-Lead GN
and SO Packages
The LTC
廬
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
internal feedback system that can provide output regula-
tion of
鹵1%
over temperature, load current and line voltage
shifts. The LTC1430A uses a synchronous switching archi-
tecture with two N-channel output devices, eliminating the
need for a high power, high cost P-channel device. Addi-
tionally, 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 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鈥檚 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 350碌A(chǔ) 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 1碌A(chǔ).
, 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.
APPLICATI
s
s
s
s
S
Power Supply for Pentium
廬
II and AMD-K6
廬
Microprocessors
High Power 5V to 3.xV Regulators
Local Regulation for Dual Voltage Logic Boards
Low Voltage, High Current Battery Regulation
TYPICAL APPLICATI
5V
Typical 5V to 3.3V, 10A Application
100
+
100鈩?/div>
1碌F
PV
CC2
MBR0530T1
PV
CC1
G1
I
MAX
LTC1430A I
FB
FREQSET
SHDN
COMP
G2
PGND
GND
SENSE
+
SENSE
鈥?/div>
FB
NC
0.1碌F
1k
16k
0.1碌F
+
C
IN
220碌F
脳4
EFFICIENCY (%)
+
4.7碌F
0.1碌F
0.01碌F
NC
SHUTDOWN
C1
220pF
V
CC
SS
Q1A, Q1B
2 IN PARALLEL
2.7碌H/15A
Q2
+
C
OUT
330碌F
脳6
3.3V
10A
R
C
7.5k
C
C
4700pF
1430 TA01
Q1A, Q1B, Q2: MOTOROLA MTD20N03HL
C
IN
: AVX-TPSE227M010R0100
C
OUT
: AVX-TPSE337M006R0100
U
Efficiency
90
80
70
60
50
40
0.1
T
A
= 25擄C
PV
CC
= 5V
V
OUT
= 3.3V
1
LOAD CURRENT (A)
10
1430 TA02
UO
UO
1

LTC1430AIGN 產(chǎn)品屬性

  • 100

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - 專用型

  • -

  • 控制器，Intel Pentium? II，AMD-K6?

  • 4 V ~ 8 V

  • 1

  • 3.3V

  • -40°C ~ 85°C

  • 表面貼裝

  • 16-SSOP（0.154"，3.90mm 寬）

  • 16-SSOP

  • 管件

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