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LTC3446
1
3446ff
Typical applicaTion
FeaTures
applicaTions
DescripTion
Monolithic Buck Regulator
with Dual VLDO Regulators
The LTC
?/DIV>
3446 combines a synchronous buck DC/DC con-
verter with two very low dropout (VLDO) linear regulators
to provide up to three stepped-down output voltages from
a single input voltage. The input voltage range is ideally
suited for Li-Ion battery-powered applications, as well
as powering low voltage logic from 5V or 3.3V rails. The
output voltage range extends down to 0.4V for the VLDO
regulators and 0.8V for the buck.
The 1A synchronous buck converter provides the main
output with high efficiency, typically 85%. The two 300mA
VLDO regulators can run off the main output to provide
two additional lower voltage outputs. A built-in supply
monitor provides a power good indication.
The buck converter switches at 2.25MHz, allowing the use
of small surface mount inductors and capacitors. Constant
frequency current mode operation produces controlled
output spectrum and fast transient response. A mode-
select pin allows automatic Burst Mode operation to be
enabled for higher efficiency at light load, or disabled for
lower noise operation down to very light loads. The two
VLDO regulators are stable with ceramic output capacitors
as small as 1礔.
L, LT, LTC, LTM and Burst Mode are registered trademarks and VLDO, Hot Swap, PowerPath
and Bat-Track are trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents including 5481178, 6611131,
6304066, 6498466, 6580258.
Buck Efficiency vs Buck Load Current
n
 High Effciency Triple Step-Down Outputs from a 
Single Input Supply
n
 1A Synchronous Buck Regulator Provides Main
Step-Down Output and Powers Two 300mA VLDO"
Linear Regulators
n
 Output Voltages as Low as 400mV (VLDO Outputs)
n
 Power Good Output
n
 Input Voltage Range: 2.7V to 5.5V
n
 Independent Enable Pin for Each Supply
n
 Low (140礎 Typ) No-Load Quiescent Current with
All Outputs Enabled
n
 Constant Frequency Current Mode Operation
n
 2.25MHz Switching Frequency Uses Small Inductors
n
 Defeatable Automatic Burst Mode
?/DIV>
 Operation for
High Efficiency at Light Loads
n
 ?.5% Reference Accuracy
n
 Overtemperature Protection
n
 Thermally Enhanced 4mm ?3mm 14-Pin DFN
Package
n
 Low Power Handheld Devices
n
 Low Voltage and Multivoltage Power for Digital
Logic, I/O, FPGAs, CPLDs, ASICs and CPUs
V
IN
59k
L1
1.8礖
47.5k
SW
BUCKFB
LV
IN
LTC3446
GND
22礔
X7R
1000pF
DIGITAL
CONTROL
22礔
X7R
V
OUT
1.8V
400mA MAX
110k
40.2k
2.2礔
X7R
V
OUT
1.5V
300mA MAX
V
IN
2.9V TO 5.5V
LV
OUT1
PGOOD
MODESEL
ENBUCK
ENLDO1
ENLDO2
LV
FB1
80.6k
40.2k
2.2礔
X7R
L1: TOKO A960AW-1R8M
3446 TA01
V
OUT
1.2V
300mA MAX
LV
OUT2
3.3k
I
TH
LV
FB2
LOAD CURRENT (mA)
1
40
50
60
70
80
100
10
100
3446 TA01b
1000
90
V
IN
 = 2.7V
V
IN
 = 3.6V
V
IN
 = 4.2V
Burst Mode
OPERATION
PWM
MODE
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