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LTC1436ACGN-PLL 데이터시트 PDF




Linear Technology에서 제조한 전자 부품 LTC1436ACGN-PLL은 전자 산업 및 응용 분야에서
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부품번호 LTC1436ACGN-PLL 기능
기능 High Efficiency Low Noise Synchronous Step-Down Switching Regulators
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LTC1436ACGN-PLL 데이터시트, 핀배열, 회로
LTC1436A
LTC1436A-PLL/LTC1437A
High Efficiency Low Noise
Synchronous Step-Down
Switching Regulators
FEATURES
s Maintains Constant Frequency at Low Output Currents
s Dual N-Channel MOSFET Synchronous Drive
s Programmable Fixed Frequency (PLL Lockable)
s Wide VIN Range: 3.5V to 36V Operation
s Low Minimum On-Time (300ns) for High
Frequency, Low Duty Cycle Applications
s Very Low Dropout Operation: 99% Duty Cycle
s Low Dropout, 0.5A Linear Regulator for CPU I/O
or Low Noise Audio Supplies
s Built-In Power-On Reset Timer
s Programmable Soft Start
s Low-Battery Detector
s Remote Output Voltage Sense
s Foldback Current Limiting (Optional)
s Pin Selectable Output Voltage
s Logic Controlled Micropower Shutdown: IQ < 25µA
s Output Voltages from 1.19V to 9V
s Available in 24-Lead Narrow SSOP and 28-Lead
SSOP Packages
U
APPLICATIONS
s Notebook and Palmtop Computers, PDAs
s Cellular Telephones and Wireless Modems
s Portable Instruments
s Battery-Operated Devices
s DC Power Distribution Systems
DESCRIPTION
The LTC®1436A/LTC1437A are synchronous step-down
switching regulator controllers that drive external
N-channel power MOSFETs in a phase lockable, fixed
frequency architecture. The Adaptive PowerTM output stage
selectively drives two N-channel MOSFETs at frequencies
up to 400kHz while reducing switching losses to maintain
high efficiencies at low output currents.
An auxiliary 0.5A linear regulator using an external PNP
pass device provides a low noise, low dropout voltage
source. A secondary winding feedback control pin (SFB)
guarantees regulation regardless of the load on the main
output by forcing continuous operation.
An additional comparator is available for use as a low-
battery detector. A power-on reset timer (POR) is included
which generates a signal delayed by 65536/fCLK (300ms
typically) after the output is within 5% of the regulated
output voltage. Internal resistive dividers provide pin
selectable output voltages with remote sense capability.
The operating current level is user-programmable via an
external current sense resistor. Wide input supply range
allows operation from 3.5V to 30V (36V maximum).
, LTC and LT are registered trademarks of Linear Technology Corporation.
Adaptive Power is a trademark of Linear Technology Corporation.
TYPICAL APPLICATION
COSC
43pF
CSS
0.1µF
RC
10k
COSC
RUN/SS
VIN
TGL
TGS
CC
510pF
100pF
ITH
SGND
LTC1436A
SW
INTVCC
BOOST
VPROG
VOSENSE
SENSE
BG
PGND
SENSE+
1000pF
VIN
4.5V TO 22V
M3
IRLML2803
DB
CMDSH-3
CB
0.1µF
M1
Si4412DY
L1
4.7µH
+
CIN
22µF
35V
×2
RSENSE
0.02
+
4.7µF
M2
Si4412DY
D1
MBRS140T3
Figure 1. High Efficiency Step-Down Converter
R1
35.7k +
R2
102k
VOUT
1.6V
5A
COUT
100µF
6.3V
×2
1436 F01
1




LTC1436ACGN-PLL pdf, 반도체, 판매, 대치품
LTC1436A
LTC1436-PLL-A/LTC1437A
ELECTRICAL CHARACTERISTICS TA = 25°C, VIN = 15V, VRUN/SS = 5V unless otherwise noted.
SYMBOL
PARAMETER
Low-Battery Comparator
VSATLBO
LBO Saturation Voltage
ILLBO
LBO Leakage
VTHLBI
LBI Trip Voltage
IINLBI
LBI Input Current
VHYSLBO
LBO Hysteresis
Auxiliary Regulator/Comparator
IAUXDR
AUXDR Current
Max Current Sinking Capability
Control Current
Leakage When Off
IIN AUXFB
IIN AUXON
VTH AUXON
VSAT AUXDR
VAUXFB
AUXFB Input Current
AUXON Input Current
AUXON Trip Voltage
AUXDR Saturation Voltage
AUXFB Voltage
VTH AUXDR AUXFB Divider Disconnect Voltage
CONDITIONS
MIN TYP MAX
ILBO = 1.6mA, VLBI = 1.1V
VLBO = 12V, VLBI = 1.4V
High to Low Transition on LBO
VLBI = 1.19V
0.6 1
q 0.01 1
q 1.16 1.19 1.22
q 1 50
20
VEXTVCC = 0V
VAUXDR = 4V, VAUXFB = 1.0V, VAUXON = 5V
VAUXDR = 5V, VAUXFB = 1.5V, VAUXON = 5V
VAUXDR = 24V, VAUXFB = 1.5V, VAUXON = 0V
10 15
1
0.01
5
1
VAUXFB = 1.19V, VAUXON = 5V
0.01 1
VAUXON = 5V
0.01 1
VAUXDR = 4V, VAUXFB = 1.0V
1.0 1.19 1.4
IAUXDR = 1.6mA, VAUXFB = 1.0V, VAUXON = 5V
0.4 0.8
VAUXON = 5V, 11V < VAUXDR < 24V (Note 5)
q 11.5
12
12.5
VAUXON = 5V, 3V < VAUXDR < 7V (Note 5)
q 1.14 1.19 1.24
VAUXON = 5V (Note 5), Ramping Negative
7.5 8.5 9.5
UNITS
V
µA
V
nA
mV
mA
µA
µA
µA
µA
V
V
V
V
V
The q denotes specifications which apply over the full operating
temperature range.
LTC1436ACGN/LTC1436ACGN-PLL/LTC1437ACG: 0°C TA 70°C
LTC1436AIGN/LTC1436AIGN-PLL/LTC1437AIG: – 40°C TA 85°C
Note 1: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
LTC1436ACGN/LTC1436ACGN-PLL/LTC1436AIGN/
LTC1436AIGN-PLL: TJ = TA + (PD)(110 °C/W)
LTC1437ACG/LTC1437AIG: TJ = TA + (PD)(95 °C/W)
Note 2: The LTC1436A/LTC1437A are tested in a feedback loop which
servos VOSENSE to the balance point for the error amplifier
(VITH = 1.19V).
Note 3: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information
section.
Note 4: Oscillator frequency is tested by measuring the COSC charge and
discharge currents and applying the formula:
( ) ( )fOSC (kHz) =
8.4(108)
COSC (pF) + 11
1
ICHG
+
1
IDIS
–1
Note 5: The Auxiliary Regulator is tested in a feedback loop which servos
VAUXFB to the balance point for the error amplifier. For applications with
VAUXDR > 9.5V, VAUXFB uses an internal resistive divider. See
Applications Information.
Note 6: The minimum on-time test condition corresponds to an inductor
peak-to-peak ripple current 40% of IMAX (see Minimum On-Time
Considerations in the Applications Information section).
4

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LTC1436ACGN-PLL 전자부품, 판매, 대치품
LTC1436A
LTC1436A-PLL/LTC1437A
TYPICAL PERFORMANCE CHARACTERISTICS
Auxiliary Regulator
Sink Current Available
20
15
10
5
0
0 2 4 6 8 10 12 14 16
AUX DR VOLTAGE (V)
1436 G19
Auxiliary Regulator PSRR
70
10mA LOAD
60
50
100mA LOAD
40
30
20
10
10
100
FREQUENCY (kHz)
1000
1436 G20
PIN FUNCTIONS
VIN: Main Supply Pin. Must be closely decoupled to the
IC’s signal ground pin.
INTVCC: Output of the Internal 5V Regulator and EXTVCC
Switch. The driver and control circuits are powered from
this voltage. Must be closely decoupled to power ground
with a minimum of 2.2µF tantalum or electrolytic capacitor.
DRVCC: Bottom MOSFET Driver Supply Voltage.
EXTVCC: Input to the Internal Switch Connected to INTVCC.
This switch closes and supplies VCC power whenever
EXTVCC is higher than 4.7V. See EXTVCC connection in
Applications Information section. Do not exceed 10V on
this pin. Connect to VOUT if VOUT 5V.
BOOST: Supply to Topside Floating Driver. The bootstrap
capacitor is returned to this pin. Voltage swing at this pin
is from INTVCC to VIN + INTVCC.
SW: Switch Node Connection to Inductor. Voltage swing
at this pin is from a Schottky diode (external) voltage drop
below ground to VIN.
SGND: Small Signal Ground. Must be routed separately
from other grounds to the (–) terminal of COUT.
PGND: Driver Power Ground. Connects to source of
bottom N-channel MOSFET and the (–) terminal of CIN.
SENSE : The (–) Input to the Current Comparator.
SENSE +: The (+) Input to the Current Comparator. Built-
in offsets between SENSEand SENSE+ pins in conjunction
with RSENSE set the current trip thresholds.
VOSENSE: Receives the remotely sensed feedback voltage
either from the output or from an external resistive divider
across the output . The VPROG pin determines which point
VOSENSE must connect to.
VPROG: This voltage selects the output voltage. For VPROG
< VINTVCC/3 the output is set to 3.3V with VOSENSE
connected to the output. With VPROG > VINTVCC/1.5 the
output is set to 5V with VOSENSE connected to the output.
Leaving VPROG open (DC) allows the output voltage to be
set by an external resistive divider connected to VOSENSE.
COSC: External capacitor COSC from this pin to ground sets
the operating frequency.
ITH: Error Amplifier Compensation Point. The current
comparator threshold increases with this control voltage.
Nominal voltage range for this pin is 0V to 2.5V.
RUN/SS: Combination of Soft Start and Run Control
Inputs. A capacitor to ground at this pin sets the ramp time
to full current output. The time is approximately 0.5s/µF.
7

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부품번호상세설명 및 기능제조사
LTC1436ACGN-PLL

High Efficiency Low Noise Synchronous Step-Down Switching Regulators

Linear Technology
Linear Technology

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