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LTC3863 데이터시트 PDF




Linear Technology에서 제조한 전자 부품 LTC3863은 전자 산업 및 응용 분야에서
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부품번호 LTC3863 기능
기능 DC/DC Controller
제조업체 Linear Technology
로고 Linear Technology 로고


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LTC3863 데이터시트, 핀배열, 회로
LTC3863
60V Low IQ Inverting
DC/DC Controller
Features
n Wide Operating VIN Range: 3.5V to 60V
n Wide Negative VOUT Range: –0.4V to Beyond –150V
n Low Operating IQ = 70µA
n Strong High Voltage MOSFET Gate Driver
n Constant Frequency Current Mode Architecture
n Verified FMEA for Adjacent Pin Open/Short
n Selectable High Efficiency Burst Mode® Operation or
Pulse-Skipping Mode at Light Loads
n Programmable Fixed Frequency: 50kHz to 850kHz
n Phase-Lockable Frequency: 75kHz to 750kHz
n Accurate Current Limit
n Programmable Soft-Start or Voltage Tracking
n Internal Soft-Start Guarantees Smooth Start-Up
n Low Shutdown IQ = 7µA
n Available in Small 12-Lead Thermally Enhanced
MSOP and DFN Packages
Applications
n Industrial and Automotive Power Supplies
n Telecom Power Supplies
n Distributed Power Systems
Description
The LTC®3863 is a robust, inverting DC/DC PMOS control-
ler optimized for automotive and industrial applications. It
drives a P-channel power MOSFET to generate a negative
output and requires just a single inductor to complete the
circuit. Output voltages from –0.4V to –150V are typically
achievable with higher voltages possible, only limited by
external components.
The LTC3863 offers excellent light load efficiency, draw-
ing only 70μA quiescent current in a user programmable
Burst Mode operation. Its peak current mode, constant
frequency PWM architecture provides for good control of
switching frequency and output current limit. The switch-
ing frequency can be programmed from 50kHz to 850kHz
with an external resistor and can be synchronized to an
external clock from 75kHz to 750kHz.
The LTC3863 offers programmable soft-start or output
tracking. Safety features include overvoltage, overcurrent
and short-circuit protection including frequency foldback.
The LTC3863 is available in thermally enhanced 12-lead
MSOP and 3mm × 4mm DFN packages.
L, LT, LTC, LTM, OPTI-LOOP, Linear Technology, Burst Mode and the Linear logo are registered
trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks
are the property of their respective owners. Protected by U.S. Patents including 5731694.
Typical Application
4.5V to 16V Input, –5V/1.7A Output, 350kHz Inverting Converter
350kHz
27nF 14.7k
61.9k
0.47µF
RUN CAP
VIN
PLLIN/MODE
SS SENSE
GATE
ITH LTC3863
FREQ
SGND
PGND
VFBN
VFB
10µF +
25V
×2
16mΩ
VIN
100µF 4.5V TO 16V
20V
Si7129
10µHB540C 511k
33µF
×2
68pF
80.6k
3863 TA01a
VOUT
150µF
16V
–5V
1.7A
×2
Efficiency
90 VIN = 12V
80 VOUT = –5V
9
8
70
60 EFFICIENCY
7
6
50 5
40 PULSE-SKIPPING MODE 4
30 Burst Mode OPERATION 3
20 2
10
POWER LOSS
1
0
0.002
0.02 0.2
LOAD CURRENT (A)
0
2
3863 TA01b
For more information www.linear.com/3863
3863fa
1




LTC3863 pdf, 반도체, 판매, 대치품
LTC3863
E lectrical Characteristics The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C. (Note 4) VIN = 12V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Gate Driver
VCAP Gate Bias LDO Output Voltage (VIN-VCAP)
VCAPDROP Gate Bias LDO Dropout Voltage
∆VCAP(LINE) Gate Bias LDO Line Regulation
∆VCAP(LOAD) Gate Bias LDO Load Regulation
IGATE = 0mA
VIN = 5V, IGATE = 15mA
9V ≤ VIN ≤ 60V, IGATE = 0mA
Load = 0mA to 20mA
l 7.6
–3.5
8.0
0.2
0.002
8.5
0.5
0.03
V
V
%/V
%
RUP Gate Pull-Up Resistance
RDN Gate Pull-Down Resistance
Overvoltage
Gate High
Gate Low
0.9 Ω
VFBOV
VFB Overvoltage Lockout Threshold
GATE Going High without Delay,
VFB(OV)-VFB(NOM) in Percent
10 %
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Continuous operation above the specified maximum operating
junction temperature may impair device reliability or permanently damage
the device.
Note 3: The junction temperature (TJ in °C) is calculated from the ambient
temperature (TA in °C) and power dissipation (PD in Watts) as follows:
TJ = TA + (PD θJA)
where θJA (in °C/W) is the package thermal impedance provided in the Pin
Configuration section for the corresponding package.
Note 4: The LTC3863 is tested under pulsed load conditions such that TJ
≈ TA. The LTC3863E is guaranteed to meet performance specifications
from 0°C to 85°C operating junction temperature range. The LTC3863E
specifications over the –40°C to 125°C operating junction temperature
range are assured by design, characterization and correlation with
statistical process controls. The LTC3863I is guaranteed to meet
performance specifications over the –40°C to 125°C operating junction
temperature range, the LTC3863H is guaranteed over the –40°C to 150°C
operating junction temperature range, and the LTC3863MP is guaranteed
and tested over the full –55°C to 150°C operating junction temperature
range. High junction temperatures degrade operating lifetimes; operating
lifetime is derated for junction temperatures greater than 125°C. The
maximum ambient temperature consistent with these specifications is
determined by specific operating conditions in conjunction with board
layout, the rated package thermal impedance and other environmental
factors.
Note 5: The LTC3863 is tested in a feedback loop that adjust VREG
or (VFB – VFBN) to achieve a specified error amplifier output voltage
(on ITH pin).
3863fa
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LTC3863 전자부품, 판매, 대치품
LTC3863
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
Free Running Frequency Over
Input Voltage
600
550 FREQ = OPEN
500
450
400
FREQ = 0V
350
300
0
10 20 30 40 50 60
VIN (V)
3863 G19
GATE Bias LDO (VIN - VCAP) Load
Regulation
0.5
0.0
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
0
5 10 15
IGATE (mA)
20
3863 G22
Current Sense Voltage Over
Temperature
100
98
96
94
92
Free Running Frequency Over
Temperature
600
550 FREQ = OPEN
500
450
400
FREQ = 0V
350
300
–75
–25 25
75 125
TEMPERATURE (°C)
175
3864 G20
GATE Bias LDO (VIN - VCAP)
Dropout Behavior
0.1 VIN = 5V
0.0
–0.1
–0.2
–0.3
–0.4
–0.5
0
5 10 15
IGATE (mA)
20
3863 G23
SS Pin Pull-Up Current Over
Temperature
14
VSS = 0V
12
Frequency Foldback % Over
Feedback Voltage
120
100
80
60
40
20
0
0 200 400 600 800
VFB (mV)
3863 G21
Current Sense Voltage Over ITH
Voltage
100
90
Burst Mode OPERATION
PULSE-SKIPPING
80
70
60
50
40
30
20
10
0
–10
0
0.4 0.8 1.2 1.6
ITH VOLTAGE (V)
2
3863 G24
RUN Pin Pull-Up Current Over
Temperature
0.65
VRUN = 0V
0.55
10 0.45
8 0.35
90
–75
–25 25
75 125
TEMPERATURE (°C)
175
3863 G25
6
–75 –25 25
75 125 175
TEMPERATURE (°C)
3863 G26
For more information www.linear.com/3863
0.25
–75
–25 25
75 125
TEMPERATURE (°C)
175
3863 G27
3863fa
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