Linear Technology Analog Devices LT8607B Datasheet

FEATURES
Wide Input Voltage Range: 3.0V to 42V
Ultralow Quiescent Current Burst Mode
<3µA I Regulating 12V
n
Q
Output Ripple <10mV
n
High Efficiency 2MHz Synchronous Operation:
>93% Efficiency at 0.5A, 12V
n
750mA Maximum Continuous Output
Fast Minimum Switch-On Time: 35ns
Adjustable and Synchronizable: 200kHz to 2.2MHz
Spread Spectrum Frequency Modulation for Low EMI
Allows Use of Small Inductors
Low Dropout
Peak Current Mode Operation
Accurate 1V Enable Pin Threshold
Internal Compensation
Output Soft-Start and Tracking
Small Thermally Enhanced 10-Lead MSOP Package or
8-Lead 2mm × 2mm DFN Package
APPLICATIONS
General Purpose Step-Down Converter
Low EMI Step Down
TYPICAL APPLICATION
V
IN
V
IN
5.7V to 42V
EN/UV
4.7µF
SYNC
INTV
1µF TR/SS
RT
10nF
18.2k
f = 2MHz
SW
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Operation:
®
to 3.3V
IN OUT
P-P
to 5V
IN OUT
5V, 2MHz Step-Down
BST
0.1µF
SW
4.7µH
LT8607
PG
CC
FB 10pF
GND
187k
1M
For more information
42V, 750mA Synchronous
Step-Down Regulator with
2.5µA Quiescent Current
DESCRIPTION
The LT 8607 is a compact, high efficiency, high speed syn-
®
chronous monolithic step-down switching regulator that
consumes only 1.7µA of non-switching quiescent current.
The LT8607 can deliver 750mA of continuous current.
Low ripple Burst Mode operation enables high efficiency
down to very low output currents while keeping the output
ripple below 10mV
P-P
current mode topology allows the use of small inductors
and results in fast transient response and good loop sta-
bility. The EN/UV pin has an accurate 1V threshold and
can be used to program V
shut down the LT8607 reducing the input supply current
to 1µA. The PG pin signals when V
the programmed output voltage as well as fault conditions.
The MSOP package includes a SYNC pin to synchronize
to an external clock, or to select Burst Mode operation
or pulse-skipping with or without spread spectrum; the
TR/SS pin programs soft-start or tracking. The DFN pack-
age omits these pins and can be purchased in pulse-skip-
ping or Burst Mode operation.
PACKAGE
LT8607MSE
LT8607DFN
LT8607BDFN
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100
95
90
85
V
OUT
5V
80
750mA
100k
75
POWER
70
GOOD
65
60
22µF
55
X7R
1206 50
0
8607 TA01a
www.analog.com
LT8607/LT8607B
. Internal compensation with peak
undervoltage lockout or to
IN
is within ±8.5% of
OUT
SYNC FUNCTIONALITY
MSE Programmable
DFN Burst Mode Operation
DFN Pulse-Skipping Mode
12V to 5V Efficiency
IN OUT
L = 4.7µH
f = 2MHz
SW
125 250 375 500 625
I (mA)
OUT
8607 TA01b
750
Rev. C
1