POWER LOSS (mW)
LTC3896
150V Low I , Synchronous
Q
Inverting DC/DC Controller
Fea T Descrip T
n
Wide V + |V | Range: 4V to 140V (150V Abs Max) The LTC 3896 is a high performance inverting DC/DC
IN OUT
n
Wide Output Voltage Range: 60V to 0.8V switching regulator controller that drives an all N-channel
n
Ground-Referenced Control / Interface Pins synchronous power MOSFET stage. It converts a wide-
n
Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE) ranging positive input voltage source to a regulated negative
n
Integrated Bootstrap Diode output that can be as much as 60V below ground. The
n
Low Operating I : 40A (Shutdown = 10A) input can operate from a voltage as low as 4V and as high
Q
n
Selectable Gate Drive UVLO Thresholds as 140V |V |.
OUT
n
Onboard LDO or External NMOS LDO for DRV
CC
The LTC3896 contains true ground-referenced RUN, PLLIN
n
EXTV LDO Powers Drivers from Output
CC
and PGOOD pins, eliminating the need for external discrete
n
Phase-Lockable Frequency (75kHz to 850kHz)
level-shifting components to interface with the LTC3896.
n
Programmable Fixed Frequency (50kHz to 900kHz)
n A constant frequency current mode architecture allows a
Selectable Continuous, Pulse-Skipping or Low Ripple
phase-lockable frequency of up to 850kHz. The low 40A
Burst Mode Operation at Light Loads
n no-load quiescent current extends operating run time in
Adjustable Burst Clamp and Current Limit
n battery-powered systems. OPTI-LOOP compensation
Power Good Output Voltage Monitor
n allows the transient response to be optimized over a
Programmable Input Overvoltage Lockout
n wide range of output capacitance and ESR values. The
38-Lead TSSOP High Voltage Package
LTC3896 features a precision 0.8V reference and power
good output indicator. The soft-start (SS) pin ramps the
a T
output voltage during start-up.
n L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode and OPTI-LOOP are
Automotive and Industrial Power Systems
registered trademarks of Linear Technology Corporation. All other trademarks are the property
n
Telecommunications Power Supplies of their respective owners. Protected by U.S. Patents including 5481178, 5705919, 5929620,
6144194, 6177787, 6580258.
n
Distributed Power Systems
Typical a T
High Efficiency 36V72V to 48V/2A Inverting Regulator Efficiency and Power Loss
vs Load Current
V
IN
36V to 72V
100 100k
V
0V IN
90
RUN TG
47F
EFFICIENCY
0.1F 80
PLLIN
0V 10k
GND BOOST 70
100k
V
5V PGOOD OUT
60
SW
48V
NDRV
2A
50 1k
LTC3896
0.1F POWER LOSS
DRV 47H
40
CC 4.7F
3
100V
INTV +
CC
30
SENSE
2220
4.7F
100
DRVSET
4
0.1F
20
10m V = +48V
IN
301k
DRVUV
V = 48V
OUT
10
SENSE
FIGURE 16 CIRCUIT
SS
0 10
0.0001 0.001 0.01 0.1 1 10
BG
ITH
LOAD CURRENT (A)
3896 TA01b
590k
4.99k
0.1F FREQ V
FB
V
100pF
OUT
10k
15nF
3896 TA01a
3896f
1
For more information www.linear.com/LTC3896
EFFICIENCY (%)
ion pplica
ions pplica
ion uresLTC3896
a Te Maxi Mu M r a T p in c F T
All pins with respect to V unless otherwise noted (Note 1).
OUT
TOP VIEW
Input Supply Voltage (V ) ....................... 0.3V to 150V
IN
OVLO 1 38 INTV
CC
Top Side Driver Voltage BOOST .............. 0.3V to 150V
VPRG 2 37 ILIM
Switch Voltage (SW) ................................. 5V to 150V
+
SENSE 3 36 PHASMD
DRV , (BOOST SW) Voltages ................ 0.3V to 11V
CC
SENSE 4
BG, TG ............................................................... (Note 8)
SS 5 34 RUN
GND Voltage .............................................. 0.3V to 65V
V 6
FB
RUN Voltage................................... (GND0.3V) to 150V
ITH 7 32 EXTV
CC
(PLLIN GND) Voltage ................................ 0.3V to 6V
MODE 8
(PGOOD GND) Voltage .............................. 0.3V to 6V
V 9 30 V
IN
OUT
39
+
SENSE , SENSE Voltages ......................... 0.3V to 65V
V 10
V
OUT OUT
MODE, DRVUV Voltages .............................. 0.3V to 6V CLKOUT 11 28 NDRV
GND 12
ILIM, VPRG, FREQ, PHASMD Voltages ........ 0.3V to 6V
PLLIN 13 26 DRV
CC
DRVSET Voltage .......................................... 0.3V to 6V
PGOOD 14
NDRV ................................................................. (Note 9)
V 15 24 BG
OUT
EXTV Voltage ......................................... 0.3V to 14V
CC
NC 16
ITH, V Voltages ........................................ 0.3V to 6V
FB
FREQ 17 22 BOOST
SS, OVLO Voltages ..................................... 0.3V to 6V
DRVSET 18 21 SW
Operating Junction Temperature Range (Notes 2, 3)
DRVUV 19 20 TG
LTC3896E, LTC3896I ........................ 40C to 125C
FE PACKAGE
LTC3896H ......................................... 40C to 150C
38-LEAD PLASTIC TSSOP
Storage Temperature Range ................. 65C to 150C
T = 150C, = 28C/W
JMAX JA
EXPOSED PAD (PIN 39) IS V , MUST BE SOLDERED TO PCB
OUT
FOR RATED ELECTRICAL AND THERMAL CHARACTERISTICS
o r Der i n F Ma T