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LTC3863

Description
60V Low IQ Inverting DC/DC Controller Wide Operating VIN Range: 3.5V to 60V
File Size533KB,36 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC3863 Overview

60V Low IQ Inverting DC/DC Controller Wide Operating VIN Range: 3.5V to 60V

LTC3863
60V Low I
Q
Inverting
DC/DC Controller
FEATURES
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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.
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Wide Operating V
IN
Range: 3.5V to 60V
Wide Negative V
OUT
Range: –0.4V to Beyond –150V
Low Operating I
Q
= 70µA
Strong High Voltage MOSFET Gate Driver
Constant Frequency Current Mode Architecture
Verified FMEA for Adjacent Pin Open/Short
Selectable High Efficiency Burst Mode
®
Operation or
Pulse-Skipping Mode at Light Loads
Programmable Fixed Frequency: 50kHz to 850kHz
Phase-Lockable Frequency: 75kHz to 750kHz
Accurate Current Limit
Programmable Soft-Start or Voltage Tracking
Internal Soft-Start Guarantees Smooth Start-Up
Low Shutdown I
Q
= 7µA
Available in Small 12-Lead Thermally Enhanced
MSOP and DFN Packages
APPLICATIONS
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Industrial and Automotive Power Supplies
Telecom Power Supplies
Distributed Power Systems
TYPICAL APPLICATION
4.5V to 16V Input, –5V/1.7A Output, 350kHz Inverting Converter
0.47µF
350kHz
RUN
CAP
V
IN
16m
SENSE
GATE
ITH
FREQ
SGND
V
FBN
PGND
V
FB
68pF
80.6k
3863 TA01a
Efficiency
90
V
IN
= 12V
80 V
OUT
= –5V
70
EFFICIENCY (%)
60
50
40
30
20
10
0
0.002
POWER LOSS
0.02
0.2
LOAD CURRENT (A)
2
3863 TA01b
10µF
+
25V
×2
100µF
20V
V
IN
4.5V TO 16V
9
8
7
PLLIN/MODE
SS
27nF
14.7k
61.9k
EFFICIENCY
POWER LOSS (W)
6
5
PULSE-SKIPPING MODE
Burst Mode OPERATION
4
3
2
1
0
Si7129
B540C
511k
33µF
×2
LTC3863
10µH
V
OUT
–5V
150µF 1.7A
16V
×2
For more information
www.linear.com/3863
+
3863f
1

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