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| LTC3446EDE Datasheet, PDF (6/20 Pages) Linear Technology – Monolithic Buck Regulator with Dual VLDO Regulators | |||
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LTC3446
Typical Performance Characteristics
Buck PMOS Switch On-Resistance
200
180
160
140
120
100
80
â45 â20
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
VIN = 5.5V
5 30 55 80 105 130
TEMPERATURE (°C)
3446 G13
Buck Transient Response with
Burst Mode Defeated
Buck NMOS Switch On-Resistance
200
180
160
140
120
100
80
â45 â20
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
VIN = 5.5V
5 30 55 80 105 130
TEMPERATURE (°C)
3446 G14
Buck Transient Response with
Burst Mode Enabled
BUCK OUTPUT
VOLTAGE
50mV/DIV
AC-COUPLED
500mA
LOAD
CURRENT
50mA
100µs/DIV
FRONT PAGE APPLICATION CIRCUIT
3446 G15
BUCK OUTPUT
VOLTAGE
50mV/DIV
AC-COUPLED
500mA
LOAD
CURRENT
50mA
100µs/DIV
FRONT PAGE APPLICATION CIRCUIT
3446 G16
VLDO Transient Response
VLDO OUTPUT
VOLTAGE
20mV/DIV
AC-COUPLED
300mA
LOAD
CURRENT
30mA
100µs/DIV
LVOUT = 1.5V OR 1.2V
FRONT PAGE APPLICATION CIRCUIT
3446 G17
VLDO Rejection of Buck DC/DC
Burst Mode Ripple
VLVIN =
BUCK VOUT
20mV/DIV
AC-COUPLED
VLVOUT
10mV/DIV
AC-COUPLED
2µs/DIV
VLVIN = BUCK VOUT = 1.8V
VIN = 4.2V
VLVOUT = 1.5V
ILVOUT = 50mA
CLVOUT = 2.2µF
3446 G18
6
3446ff
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