Controller. LTC3896 Datasheet

LTC3896 Datasheet PDF

Part LTC3896
Description Inverting DC/DC Controller
Feature LTC3896; LTC3896 150V Low IQ, Synchronous Inverting DC/DC Controller Features Description nn Wide VIN + |V.
Manufacture Linear
Datasheet
Download LTC3896 Datasheet




LTC3896
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



LTC3896
LTC3896
Absolute Maximum Ratings
All pins with respect to VOUT– unless otherwise noted (Note 1).
Input Supply Voltage (VIN)........................ –0.3V to 150V
Top Side Driver Voltage BOOST............... –0.3V to 150V
Switch Voltage (SW) .................................. –5V to 150V
DRVCC, (BOOST – SW) Voltages................. –0.3V to 11V
BG, TG................................................................ (Note 8)
GND Voltage............................................... –0.3V to 65V
RUN Voltage................................... (GND–0.3V) to 150V
(PLLIN – GND) Voltage................................. –0.3V to 6V
(PGOOD – GND) Voltage............................... –0.3V to 6V
SENSE+, SENSEVoltages.......................... –0.3V to 65V
MODE, DRVUV Voltages............................... –0.3V to 6V
ILIM, VPRG, FREQ, PHASMD Voltages......... –0.3V to 6V
DRVSET Voltage........................................... –0.3V to 6V
NDRV.................................................................. (Note 9)
EXTVCC Voltage.......................................... –0.3V to 14V
ITH, VFB Voltages......................................... –0.3V to 6V
SS, OVLO Voltages...................................... –0.3V to 6V
Operating Junction Temperature Range (Notes 2, 3)
LTC3896E, LTC3896I......................... –40°C to 125°C
LTC3896H.......................................... –40°C to 150°C
Storage Temperature Range.................. –65°C to 150°C
Pin Configuration
OVLO 1
VPRG
SENSE+
SENSE
2
3
4
SS 5
VFB 6
ITH 7
MODE
VOUT–
VOUT–
CLKOUT
8
9
10
11
GND 12
PLLIN 13
PGOOD
VOUT–
NC
14
15
16
FREQ 17
DRVSET 18
DRVUV 19
TOP VIEW
VO3U9T–
38 INTVCC
37 ILIM
36 PHASMD
34 RUN
32 EXTVCC
30 VIN
28 NDRV
26 DRVCC
24 BG
22 BOOST
21 SW
20 TG
FE PACKAGE
38-LEAD PLASTIC TSSOP
EXPOSED PAD (PTINJM3A9X)=IS15V0O°UCT,,θMJAU=S2T8B°EC/SWOLDERED TO PCB
FOR RATED ELECTRICAL AND THERMAL CHARACTERISTICS
Order Information
http://www.linear.com/product/LTC3896#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3896EFE#PBF
LTC3896EFE#TRPBF
LTC3896FE
38-Lead Plastic TSSOP
–40°C to 125°C
LTC3896IFE#PBF
LTC3896IFE#TRPBF
LTC3896FE
38-Lead Plastic TSSOP
–40°C to 125°C
LTC3896HFE#PBF
LTC3896HFE#TRPBF
LTC3896FE
38-Lead Plastic TSSOP
–40°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
3896f
2 For more information www.linear.com/LTC3896



LTC3896
LTC3896
E lectrical Characteristics The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are
0V, VDRVSET = 0V, VPRG = FLOAT unless otherwise noted.
aAtlTl Api=n
2v5o°ltCag(Nesotwe i2th),rVesINpe=c1t 2toV,VVORUUT–N,
= 5V with respect
unless otherwise
to GND,
noted.
EXTVCC
=
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIN
VOUT–
Input Supply Operating Voltage Range
(VIN + |VOUT–|)
Regulated Output Voltage Set Point
(Note 10) DRVUV = VOUT–
VIN + |VOUT–| ≤ 140V
4 140 V
–60 –0.8 V
VFB Regulated Feedback Voltage
IFB Feedback Current
(Note 4); ITH Voltage = 1.2V
0°C to 85°C, VPRG = FLOAT
VPRG = FLOAT
VPRG = VOUT–
VPRG = INTVCC
(Note 4)
VPRG = FLOAT
VPRG = VOUT– or INTVCC
0.792
l 0.788
l 3.220
l 4.875
0.800
0.800
3.300
5.000
0.808
0.812
3.380
5.125
–0.006 ±0.050
46
V
V
V
V
µA
µA
Reference Voltage Line Regulation
(Note 4) VIN = 4.5V to 150V
0.002 0.02
%/V
Output Voltage Load Regulation
(Note 4) Measured in Servo Loop,
∆ITH Voltage = 1.2V to 0.7V
l
0.01 0.1
%
(Note 4) Measured in Servo Loop, ∆ITH
Voltage = 1.2V to 1.6V
l
–0.01 –0.1
%
gm Transconductance Amplifier gm
(Note 4) ITH = 1.2V, Sink/Source 5µA
IQ Input DC Supply Current
(Note 5) VDRVSET = VOUT–
Pulse-Skipping or Forced Continuous Mode VFB = 0.83V (No Load)
Sleep Mode
VFB = 0.83V (No Load)
Shutdown
RUN = 0V with Respect to GND
2.2 mmho
2.5
40 55
10 20
mA
µA
µA
UVLO
Undervoltage Lockout
VRUN ON
VRUN Hyst
OVLO
OVLO Hyst
RUN Pin ON Threshold
RUN Pin Hysteresis
Overvoltage Lockout Threshold
OVLO Hysteresis
D RVDCRCVRUaVm=piVnOgUUT–p
DRVUV = INTVCC, DRVSET = INTVCC
DRVDCRCVRUaVm=piVnOgUDT–own
DRVUV = INTVCC, DRVSET = INTVCC
VRUN Rising with Respect to GND
VOVLO Rising with Respect to VOUT–
l 4.0 4.2
l 7.5 7.8
l 3.6 3.8 4.0
l 6.4 6.7 7.0
l 1.1 1.2 1.3
80
l 1.1 1.2 1.3
100
V
V
V
V
V
mV
V
mV
OVLO Delay
1 µs
ISENSE+
ISENSE–
Feedback Overvoltage Protection
SENSE+ Pin Current
SENSEPin Current
Maximum Duty Factor
ISS Soft-Start Charge Current
VSENSE(MAX) Maximum Current Sense Threshold
Gate Driver
Measured at VFB, Relative to Regulated VFB
SENSE
SENSE
<
>
VINTVCC
VINTVCC
+
0.5V
0.5V
FREQ = VOUT–
VSS = 0V
VFB = 0.7V, VSENSE– = 3.3V
ILIM = FLOAT
ILIM = VOUT–
ILIM = INTVCC
7
98
8
l 66
l 43
l 90
10 13
±1
±1
850
99
10 12
75 84
50 57
100 109
%
µA
µA
µA
%
µA
mV
mV
mV
TG Pull-Up On-Resistance
TG Pull-Down On-Resistance
VDRVSET = INTVCC
2.2 Ω
1.0 Ω
For more information www.linear.com/LTC3896
3896f
3







@ 2014 :: Datasheetspdf.com ::
Semiconductors datasheet search & download site (Privacy Policy & Contact)