LTC3610EWPPBF Datasheet, PDF (1/24 Pages) Linear Technology – 24V, 12A Monolithic Synchronous Step-Down DC/DC Converter

Features
■ _{12A Output Current}
■ _{Wide VIN Range = 4V to 24V}
■ _{Internal N-Channel MOSFETs}
■ _{True Current Mode Control}
■ _{Optimized for High Step-Down Ratios}
■ _{tON(MIN) ≤100ns}
■ _{Extremely Fast Transient Response}
■ _{Stable with Ceramic COUT}
■ _{±1% 0.6V Voltage Reference}
■ _{Power Good Output Voltage Monitor}
■ _{Adjustable On-Time/Switching Frequency}
■ _{Adjustable Current Limit}
■ _{Programmable Soft-Start}
■ _{Output Overvoltage Protection}
■ _{Optional Short-Circuit Shutdown Timer}
■ _{Low Shutdown IQ: 15µA}
■ _{Available in a 9mm × 9mm 64-Pin QFN Package}
Applications
■ _{Point of Load Regulation}
■ _{Distributed Power Systems}
L, LT, LTC, LTM, 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, 6100678, 6580258, 5847554, 6304066.
LTC3610
24V, 12A Monolithic
Synchronous Step-Down
DC/DC Converter
Description
The LTC^®3610 is a high efficiency, monolithic synchronous
step-down DC/DC converter that can deliver up to 12A
output current from a 4V to 24V (28V maximum) input
supply. It uses a valley current control architecture to de-
liver very low duty cycle operation at high frequency with
excellent transient response. The operating frequency is
selected by an external resistor and is compensated for
variations in V_IN and V_OUT.
The LTC3610 can be configured for discontinuous or
forced continuous operation at light load. Forced continu-
ous operation reduces noise and RF interference while
discontinuous mode provides high efficiency by reducing
switching losses at light loads.
Fault protection is provided by internal foldback current
limiting, an output overvoltage comparator and an optional
short-circuit shutdown timer. Soft-start capability for sup-
ply sequencing is accomplished using an external timing
capacitor. The regulator current limit is user programmable.
A power good output voltage monitor indicates when
the output is in regulation. The LTC3610 is available in a
compact 9mm × 9mm QFN package.
Typical Application
High Efficiency Step-Down Converter
0.1µF
100pF
470pF
31.83k
V_ON
I_ON
RUN/SS V_IN
LTC3610
SW
I_TH
BOOST
SGND INTV_CC
FCB
V_RNG
PGOOD ^PGND
EXTV_CC V_FB
3610 TA01a
604k
0.47µH
0.22µF
10µF
×3
V_IN
4V TO 24V
100µF
×2
V_OUT
2.5V
12A
4.7µF
30.1k
9.5k
Efficiency vs Load Current
100
95
90
85
80
75
70
65
60
55
50
0.01
V_IN = 5V
V_IN = 12V
10000
1000
100
POWER LOSS 5V
POWER LOSS 12V
10
V_OUT = 2.5V
1
0.1
1
10
LOAD CURRENT (A)
3610 TA01b
3610ff