LTC3624/LTC3624-2
1
36242fd
For more information www.linear.com/LTC3624
Typical applicaTion
FeaTures DescripTion
17V, 2A Synchronous
Step-Down Regulator with
3.5µA Quiescent Current
The LT C
®
3624/LTC3624-2 is a high efficiency 17V, 2A
synchronous monolithic step-down regulator. The switch-
ing frequency is fixed to 1MHz (LTC3624) or 2.25MHz
(
LTC3624
-2) with a ±40% synchronization range. The
regulator features ultralow quiescent current and high
efficiency over a wide V
OUT
range.
The step-down regulator operates from an input voltage
range of 2.7V to 17V and provides an adjustable output
range from 0.6V to V
IN
while delivering up to 2A of output
current. A user-selectable mode input is provided to allow
the user to trade off ripple noise for light load efficiency;
Burst Mode operation provides the highest efficiency at
light loads, while pulse-skipping mode provides the lowest
voltage ripple. The MODE pin can also be used to sync the
switching frequency to an external clock.
Efficiency and Power Loss vs Load
5V V
OUT
with 800mA Burst Clamp, f
SW
= 1MHz
applicaTions
n
Wide V
IN
Range: 2.7V to 17V
n
Wide V
OUT
Range: 0.6V to V
IN
n
95% Max Efficiency
n
Low I
Q
: 3.5µA, Zero-Current Shutdown
n
Constant Frequency (1MHz/2.25MHz)
n
Fixed V
OUT
Options Available
n
Low Dropout Operation (100% Duty Cycle) with
Ultralow I
Q
n
2A Rated Output Current
n
±1% Output Voltage Accuracy
n
Current Mode Operation for Excellent Line and Load
Transient Response
n
Synchronizable to External Clock
n
Pulse-Skipping, Forced Continuous, Burst Mode
®
Operation
n
Internal Compensation and Soft-Start
n
Overtemperature Protection
n
Compact 8-Lead DFN (3mm × 3mm) Package
n
Battery Powered Equipment
n
Portable Instrumentation
n
Emergency Radios
n
General Purpose Step-Down Supplies
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents, including 5481178, 6580258,
6498466, 6611131, 6177787, 5705919, 5847554, 6703692.
LTC3624/LTC3624-2 Options
PART NAME FREQUENCY V
OUT
LTC3624 1MHz Adjustable
LTC3624-3.3 1MHz 3.3V
LTC3624-5 1MHz 5V
LTC3624-2 2.25MHz Adjustable
LTC3624-23.3 2.25MHz 3.3V
LTC3624-25 2.25MHz 5V
LOAD CURRENT (A)
0
0
EFFICIENCY (%)
POWER LOSS (W)
10
30
40
50
100
70
0.5
1
3624 TA01b
20
80
90
60
0
0.2
0.4
0.6
1.2
1.0
0.8
1.5
2
V
OUT
= 5V
BURST MODE OPERATION
V
IN
= 12V
V
IN
= 8V
V
IN
= 6V
FREQ = 1MHz
2.2µF
47µF
36242 TA01a
3.3µH
V
OUT
5V
2A
V
IN
RUN
SW
V
IN
5.6V TO 17V
LTC3624-5
GND
FB
MODE/SYNC
INTV
CC
10µF