LTC3895
150V Low I , Synchronous
Q
Step-Down DC/DC Controller
FeaTures
DescripTion
TheLTC®3895isahighperformancestep-downswitching
regulator DC/DC controller that drives an all N-channel
synchronous power MOSFET stage that can operate from
input voltages up to 140V. A constant frequency current
mode architecture allows a phase-lockable frequency of
up to 850kHz.
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Wide V Range: 4V to 140V (150V Abs Max)
IN
n
Wide Output Voltage Range: 0.8V to 60V
Adjustable Gate Drive Level: 5V to 10V (OPTI-DRIVE)
Low Operating I : 40μA (Shutdown = 10μA)
100% Duty Cycle Operation
n
n
Q
n
n
n
n
n
n
n
n
No External Bootstrap Diode Required
Selectable Gate Drive UVLO Thresholds
Onboard LDO or External NMOS LDO for DRV
The gate drivevoltage can beprogrammed from 5V to10V
to allow the use of logic or standard-level FETs to maxi-
mize efficiency. An integrated switch in the top gate driver
eliminates the need for an external bootstrap diode. An
internalchargepumpallowsfor100%dutycycleoperation.
CC
EXTV LDO Powers Drivers from V
CC
OUT
Phase-Lockable Frequency (75kHz to 850kHz)
Programmable Fixed Frequency (50kHz to 900kHz)
Selectable Continuous, Pulse-Skipping or Low Ripple
Burst Mode® Operation at Light Loads
Thelow40μAno-loadquiescentcurrentextendsoperating
run time in battery-powered systems. OPTI-LOOP® com-
pensation allows the transient response to be optimized
over a wide range of output capacitance and ESR values.
The LTC3895 features a precision 0.8V reference and
power good output indicator. The output voltage can be
programmedbetween0.8Vto60Vusingexternalresistors
or pin-programmed for a fixed 5V or 3.3V.
n
n
n
n
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Adjustable Burst Clamp and Current Limit
Adjustable or Fixed (5V/3.3V) Output Voltage
Power Good Output Voltage Monitor
Programmable Input Overvoltage Lockout
38-Lead TSSOP High Voltage Package
applicaTions
L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, PolyPhase, Linear Technology and the Linear logo
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.
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Automotive and Industrial Power Systems
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High Voltage Battery Operated Systems
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Telecommunications Power Systems
Typical applicaTion
High Efficiency High Voltage 12V Output Step-Down Regulator
Efficiency and Power Loss
vs Load Current
V
IN
7V to 140V
100
90
80
70
60
50
40
30
20
10
0
10k
1k
100µF
V
RUN
IN
NDRV
DRV
TG
EFFICIENCY
0.1µF
*V
OUT
FOLLOWS V WHEN V < 12V
IN IN
CC
BOOST
6mΩ
33µH
4.7µF
V
OUT
LTC3895
12V*
SW
5A
INTV
CC
100
10
1
BG
V
= 24V
IN
150µF
x3
CPUMP_EN
0.1µF
POWER LOSS
V
IN
= 48V
SENSE+
ITH
1nF
SENSE–
SS
10k
EXTV
0.1µF
30.1k
CC
100pF
511k
FREQ
V
FB
0.0001 0.001
0.01
0.1
1
10
4.7nF
36.5k
LOAD CURRENT (A)
GND
3895 TA01b
3895fa
1
For more information www.linear.com/LTC3895
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