LTC1430ACS Linear Technology, LTC1430ACS Datasheet

IC SW REG CNTRLR STEP-DWN 16SOIC

LTC1430ACS

Manufacturer Part Number
LTC1430ACS
Description
IC SW REG CNTRLR STEP-DWN 16SOIC
Manufacturer
Linear Technology
Type
Step-Down (Buck)r
Datasheet

Specifications of LTC1430ACS

Internal Switch(s)
No
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
3.3V, Adj
Current - Output
50A
Frequency - Switching
50kHz ~ 500kHz
Voltage - Input
4 ~ 8 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
16-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Power - Output
-

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Price
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FEATURE
A
TYPICAL
PPLICATI
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: 350 A Typ, 1 A in Shutdown
Fast Transient Response
Adjustable or Fixed 3.3V Output
Available in 8-Lead SO and 16-Lead GN
and SO Packages
Power Supply for Pentium
Microprocessors
High Power 5V to 3.xV Regulators
Local Regulation for Dual Voltage Logic Boards
Low Voltage, High Current Battery Regulation
4.7 F
+
C1
220pF
S
A
100
SHUTDOWN
0.1 F
O
PPLICATI
+
R
7.5k
U
C
NC
C
4700pF
0.01 F
C
1 F
S
Typical 5V to 3.3V, 10A Application
V
SS
FREQSET
SHDN
COMP
PV
CC
CC2
LTC1430A
SENSE
5V
®
SENSE
PV
II and AMD-K6
PGND
O
I
GND
CC1
MAX
G1
I
G2
FB
FB
+
MBR0530T1
U
NC
16k
Q1A, Q1B, Q2: MOTOROLA MTD20N03HL
C
C
IN
OUT
: AVX-TPSE227M010R0100
1k
: AVX-TPSE337M006R0100
®
0.1 F
0.1 F
Switching Regulator Controller
Q2
2.7 H/15A
Q1A, Q1B
2 IN PARALLEL
+
C
220 F
D
The LTC
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
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 350 A 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 A. For new
designs, refer to the LTC3830.
Pentium is a registered trademark of Intel Corporation.
AMD-K6 is a registered trademark of Advanced Micro Devices, Inc.
IN
4
+
1% over temperature, load current and line voltage shifts.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ESCRIPTIO
C
330 F
1430 TA01
OUT
6
High Power Step-Down
®
1430A is a high power, high efficiency switching
3.3V
10A
U
100
90
80
70
60
50
40
0.1
T
PV
V
A
OUT
CC
= 25 C
= 5V
= 3.3V
LOAD CURRENT (A)
Efficiency
1
LTC1430A
1430 TA02
10
1

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LTC1430ACS Summary of contents

Page 1

... Shutdown mode drops the LTC1430A supply current For new designs, refer to the LTC3830. , LTC and LT are registered trademarks of Linear Technology Corporation. Pentium is a registered trademark of Intel Corporation. AMD- registered trademark of Advanced Micro Devices, Inc ...

Page 2

... SHDN SHDN Figure 5V (Note 3) CC SHDN SHDN FREQSET Floating ORDER TOP VIEW PART NUMBER G2 16 LTC1430ACGN PV 15 CC2 V LTC1430AIGN LTC1430ACS MAX FREQSET 11 COMP PACKAGE 16-LEAD PLASTIC SO = 130 C/W (GN 110 C/W (S) JA LTC1430AC LTC1430AI MIN TYP MAX MIN TYP MAX 3.30 3.30 1 ...

Page 3

ELECTRICAL CHARACTERISTICS (Note 2) unless otherwise noted SYMBOL PARAMETER V SHDN Input High Voltage IH V SHDN Input Low Voltage IL I SHDN Input Current IN g Error Amplifier Transconductance mV ...

Page 4

LTC1430A W U TYPICAL PERFOR A CE CHARACTERISTICS I Pin Sink Current MAX vs Temperature 14 13.5 13.0 12.5 12.0 11.5 11.0 10.5 – 40 – 100 TEMPERATURE ( C) 1430 ...

Page 5

CTIO S (16-Lead Package/8-Lead Package) G1 (Pin 1/Pin 1): Driver Output 1. Connect this pin to the gate of the upper N-channel MOSFET, Q1. This output will swing from PV to PGND. It will always ...

Page 6

LTC1430A W BLOCK DIAGRAM DELAY SHDN 50 s FREQSET COMP LIM + I MAX 12 A TEST CIRCUITS PV CC2 + 100 CC2 + V CC 0 ...

Page 7

TEST CIRCUITS SHDN CC SHDN CC2 CC1 NC I MAX NC FREQSET LTC1430A NC COMP NC SS – GND PGND SENSE SENSE Figure 2 + 100 + 4.7 F 0.1 F SHUTDOWN ...

Page 8

LTC1430A U U APPLICATIONS INFORMATION OVERVIEW The LTC1430A is a voltage feedback PWM switching regulator controller (see Block Diagram) designed for use in high power, low voltage step-down (buck) converters. It includes an onboard PWM generator, a precision refer- ence ...

Page 9

U U APPLICATIONS INFORMATION MOSFET Gate Drive Gate drive for the top N-channel MOSFET Q1 is supplied from PV . This supply must be above PV CC1 power supply input least one power MOSFET V for efficient operation. ...

Page 10

LTC1430A PPLICATI S I FOR ATIO scheme input designs where an auxiliary 12V supply is available to power PV and PV CC1 CC2 with R specified can be ...

Page 11

PPLICATI S I FOR ATIO A are only 1.1W per device or less — large TO-220 packages and heat sinks are not necessarily required in high effi- ciency applications. Siliconix Si4410DY (in SO-8) and Motorola MTD20N03HL (in ...

Page 12

LTC1430A PPLICATI FOR ATIO The output capacitor in a buck converter sees much less ripple current under steady-state conditions than the input capacitor. Peak-to-peak current is equal to that in the inductor, usually a ...

Page 13

PPLICATI S I FOR ATIO by using a larger RC filter from the PV work well here. The 10 F capacitor must be VERY close to the part (preferably right underneath the unit) or output regulation ...

Page 14

LTC1430A PPLICATI FOR ATIO properly with an RC network from COMP to GND and an additional small C from COMP to GND (Figure 11). Loop stability is affected by inductor and output capacitor values ...

Page 15

PPLICATI S I FOR ATIO LTC1430A will be in full operation. An internal switch shorts the SS pin to GND during shutdown. The LTC1430A detects the output current by watching the voltage at I while Q1 ...

Page 16

LTC1430A PPLICATI FOR ATIO internal 20 A source and runs at 200kHz. Connecting a 50k resistor from FREQSET to ground will sink an addi- tional 25 A from FREQSET, causing the internal oscillator to ...

Page 17

PPLICATI S I FOR ATIO A + 4.7 F 35V 0.1 F GND 220pF 7. 4700pF 0.01 F GND Figure 14. Typical Schematic Showing Layout Considerations + SENSE ...

Page 18

... Figure synchronous buck regulator designed to provide a low voltage, very high current output from lower input voltage. The circuit uses two 8-pin LTC1430ACS8s, operated 180 out of phase from each other. Each half of the circuit is good for 15A of output ® current, giving 30A total. The LT 1006 amplifier forces the two half circuits to share the load current equally ...

Page 19

PPLICATI FOR ATIO W U LTC1430A 19 ...

Page 20

LTC1430A PPLICATI S I FOR ATIO the sense resistors should be well matched. This is accomplished by using trace resistors that are laid out symmetrically. Since they are formed of the same material and processed identically, ...

Page 21

PACKAGE DESCRIPTIO 0.007 – 0.0098 (0.178 – 0.249) 0.016 – 0.050 (0.406 – 1.270) * DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL ...

Page 22

LTC1430A PACKAGE DESCRIPTIO 0.010 – 0.020 (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 0.016 – 0.050 0.406 – 1.270 * DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES ...

Page 23

... FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 24

... For Standard Threshold FETs IN Synchronous, V 40V, For Logic Threshold FETs IN Synchronous N- or P-Channel FETs, Comparator/ Low-Battery Detector Dual Version of LTC1159 3.3V Input 1430af, sn1430afs LT/TP 0898 4K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1998 + 330 6.3V TANT ADDITIONAL DECOUPLING AT THE LOAD 1430 TA03 ...

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