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Linear - Inverting DC/DC Controller

Numéro de référence LTC3896
Description Inverting DC/DC Controller
Fabricant Linear 
Logo Linear 





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LTC3896 fiche technique
LTC3896
150V Low IQ, Synchronous
Inverting DC/DC Controller
Features
Description
nn Wide VIN + |VOUT–| Range: 4V to 140V (150V Abs Max)
nn Wide Output Voltage Range: –60V to –0.8V
nn Ground-Referenced Control / Interface Pins
nn Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE)
nn Integrated Bootstrap Diode
nn Low Operating IQ: 40μA (Shutdown = 10μA)
nn Selectable Gate Drive UVLO Thresholds
nn Onboard LDO or External NMOS LDO for DRVCC
nn EXTVCC LDO Powers Drivers from Output
nn Phase-Lockable Frequency (75kHz to 850kHz)
nn Programmable Fixed Frequency (50kHz to 900kHz)
nn Selectable Continuous, Pulse-Skipping or Low Ripple
Burst Mode® Operation at Light Loads
nn Adjustable Burst Clamp and Current Limit
nn Power Good Output Voltage Monitor
nn Programmable Input Overvoltage Lockout
nn 38-Lead TSSOP High Voltage Package
Applications
nn Automotive and Industrial Power Systems
nn Telecommunications Power Supplies
nn Distributed Power Systems
The LTC®3896 is a high performance inverting DC/DC
switching regulator controller that drives an all N-channel
synchronous power MOSFET stage. It converts a wide-
ranging positive input voltage source to a regulated negative
output that can be as much as 60V below ground. The
input can operate from a voltage as low as 4V and as high
as 140V – |VOUT–|.
The LTC3896 contains true ground-referenced RUN, PLLIN
and PGOOD pins, eliminating the need for external discrete
level-shifting components to interface with the LTC3896.
A constant frequency current mode architecture allows a
phase-lockable frequency of up to 850kHz. The low 40μA
no-load quiescent current extends operating run time in
battery-powered systems. OPTI-LOOP® compensation
allows the transient response to be optimized over a
wide range of output capacitance and ESR values. The
LTC3896 features a precision 0.8V reference and power
good output indicator. The soft-start (SS) pin ramps the
output voltage during start-up.
L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode and OPTI-LOOP are
registered trademarks of Linear Technology Corporation. All other trademarks are the property
of their respective owners. Protected by U.S. Patents including 5481178, 5705919, 5929620,
6144194, 6177787, 6580258.
Typical Application
High Efficiency 36V–72V to –48V/2A Inverting Regulator
VIN
36V to 72V
0.1µF
×3
47µF 0V
0V
5V
100k
4.7µF
0.1µF
301k
0.1µF
100pF
4.99k
15nF
RUN VIN
TG
PLLIN
GND BOOST
PGOOD
NDRV LTC3896
SW
DRVCC
INTVCC
DRVSET
SENSE+
DRVUV
SENSE
SS
ITH BG
FREQ VOUT
VFB
0.1µF
47µH
10mΩ
590k
10k
3896 TA01a
VOUT
–48V
2A
4.7µF
100V
2220
×4
For more information www.linear.com/LTC3896
Efficiency and Power Loss
vs Load Current
100 100k
90 EFFICIENCY
80
70
10k
60
50 1k
40 POWER LOSS
30
20
10
0
0.0001
100
VOUVTIN
=
=
+48V
–48V
0.001 0.01
FIGURE 16 CIRCUIT 10
0.1 1 10
LOAD CURRENT (A)
3896 TA01b
3896f
1

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