LTC3602_15 Datasheet, PDF (1/20 Pages) Linear Technology – 2.5A, 10V, Monolithic Synchronous Step-Down Regulator

FEATURES
n _{Wide Input Voltage Range: 4.5V to 10V}
n _{2.5A Output Current}
n _{Low RDS(ON) Internal Switches: 65mΩ and 90mΩ}
n _{Programmable Frequency: 300kHz to 3MHz}
n _{Low Quiescent Current: 75μA}
n _{0.6V ±1% Reference Allows Low Output Voltage}
n _{99% Maximum Duty Cycle}
n _{Adjustable Burst Mode}^® _Clamp
n _{Synchronizable to External Clock}
n _{Power Good Output Voltage Monitor}
n _{Overtemperature Protection}
n _{Available in 16-Lead Exposed TSSOP and}
4mm × 4mm QFN Packages
APPLICATIONS
n _{Point-of-Load Supplies}
n _{Portable Instruments}
n _{Server Backplane Power}
n _{Battery-Powered Devices}
LTC3602
2.5A, 10V, Monolithic
Synchronous Step-Down
Regulator
DESCRIPTION
The LTC^®3602 is a high efficiency, monolithic synchronous,
step-down DC/DC converter utilizing a constant-frequency,
current mode architecture. It operates from an input voltage
range of 4.5V to 10V and provides an adjustable regulated
output voltage from 0.6V to 9.5V while delivering up to
2.5A of output current. The internal synchronous power
switch with 65mΩ on-resistance increases efficiency
and eliminates the need for an external Schottky diode.
The switching frequency can either be set by an external
resistor or synchronized to an external clock. OPTI-LOOP^®
compensation allows the transient response to be optimized
over a wide range of loads and output capacitors.
The LTC3602 can be configured for either Burst Mode op-
eration or forced continuous operation. Forced continuous
operation reduces noise and RF interference, while Burst
Mode operation provides the high efficiency at light loads.
In Burst Mode operation, external control of the burst
clamp level allows the output voltage ripple to be adjusted
according to the requirements of the application.
, LT, LTC, LTM, Burst Mode and OPTI-LOOP are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
3.3V, 2.5A, 1MHz Step-Down Regulator
V_IN
4.5V TO 10V
22μF
PV_IN
RUN
INTV_CC
BOOST
105k
4.32k
1nF
R_T
PGOOD _LTC3602
SW
TRACK/SS
I_TH
SYNC/MODE
PGND
V_FB
105k
1μF
0.22μF
2.2μH
V_OUT
3.3V
2.5A
100μF
475k
22pF
3602 TA01
Efficiency and Power Loss vs Load Current
100
V_IN = 7V
95
90
EFFICIENCY
85
POWER LOSS
80
75
70
65
60
0.01
0.1
1
LOAD CURRENT (A)
10000
1000
100
10
1
10
3602 TA01b
3602fb
1