POWER LOSS (W)
LTC3624/LTC3624-2
17V, 2A Synchronous
Step-Down Regulator with
3.5A Quiescent Current
Fea T Descrip T
n
Wide V Range: 2.7V to 17V The LTC 3624/LTC3624-2 is a high efficiency 17V, 2A
IN
n
Wide V Range: 0.6V to V synchronous monolithic step-down regulator. The switch-
OUT IN
n
95% Max Efficiency ing frequency is fixed to 1MHz (LTC3624) or 2.25MHz
n
Low I : 3.5A, Zero-Current Shutdown (LTC3624-2) with a 40% synchronization range. The
Q
n
Constant Frequency (1MHz/2.25MHz) regulator features ultralow quiescent current and high
n
Fixed V Options Available efficiency over a wide V range.
OUT OUT
n
Low Dropout Operation (100% Duty Cycle) with
The step-down regulator operates from an input voltage
Ultralow I
Q
range of 2.7V to 17V and provides an adjustable output
n
2A Rated Output Current
range from 0.6V to V while delivering up to 2A of output
IN
n
1% Output Voltage Accuracy
current. A user-selectable mode input is provided to allow
n
Current Mode Operation for Excellent Line and Load
the user to trade off ripple noise for light load efficiency;
Transient Response
Burst Mode operation provides the highest efficiency at
n
Synchronizable to External Clock
light loads, while pulse-skipping mode provides the lowest
n
Pulse-Skipping, Forced Continuous, Burst Mode
voltage ripple. The MODE pin can also be used to sync the
Operation
switching frequency to an external clock.
n
Internal Compensation and Soft-Start
LTC3624/LTC3624-2 Options
n
Overtemperature Protection
PART NAME FREQUENCY V
OUT
n
Compact 8-Lead DFN (3mm 3mm) Package
LTC3624 1MHz Adjustable
LTC3624-3.3 1MHz 3.3V
LTC3624-5 1MHz 5V
a T
LTC3624-2 2.25MHz Adjustable
n
Battery Powered Equipment
LTC3624-23.3 2.25MHz 3.3V
n
Portable Instrumentation
LTC3624-25 2.25MHz 5V
n
Emergency Radios
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
n
General Purpose Step-Down Supplies
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.
Typical a T
Efficiency and Power Loss vs Load
100 1.2
5V V with 800mA Burst Clamp, f = 1MHz
OUT SW
90
1.0
80 V = 5V
OUT
3.3H
V
OUT
V
IN
V SW 5V 70 BURST MODE OPERATION
IN
5.6V TO 17V
0.8
2A
10F
LTC3624-5
60
RUN FB 47F
50 0.6
MODE/SYNC
40
36242 TA01a
INTV
CC
0.4
GND 30
2.2F
V = 12V
IN
20
0.2
V = 8V
IN
10 V = 6V
IN
FREQ = 1MHz
0 0
1 2
0 0.5 1.5
LOAD CURRENT (A)
3624 TA01b
36242fd
1
For more information www.linear.com/LTC3624
EFFICIENCY (%)
ion pplica
ions pplica
ion uresLTC3624/LTC3624-2
a Te Maxi Mu M r a T (Note 1)
V Voltage ................................................. 0.3V to 17V Operating Junction Temperature Range
IN
RUN Voltage............................................... 0.3V to 17V (Notes 2, 5) ............................................ 40C to 150C
MODE/SYNC, FB Voltages ............................ 0.3V to 6V Storage Temperature Range .................. 65C to 150C
INTV , PGOOD Voltages ............................ 0.3V to 6V
CC
p in c F T
TOP VIEW
TOP VIEW
1
SW 12 GND
SW 1 8 GND
2
SW 11 GND
13
3 10 MODE/SYNC
V
IN
V 2 7 MODE/SYNC
IN
9
GND
V 4 9 INTV
IN CC
GND
RUN 3 6 INTV
CC
RUN 5 8 FB
PGOOD 4 5 FB PGOOD 6 7 NC
MSE PACKAGE
DD PACKAGE 12-LEAD PLASTIC MSOP
8-LEAD (3mm 3mm) PLASTIC DFN
T = 150C, = 40C/W, = 10C/W
JMAX JA JC
T = 125C, = 43C/W, = 5.5C/W EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB FOR
JMAX JA JC
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB OPTIMAL THERMAL PERFORMANCE
o r Der i n F Ma T