LTC3446EDE Datasheet, PDF (3/20 Pages) Linear Technology – Monolithic Buck Regulator with Dual VLDO Regulators

LTC3446
Electrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 3.6V unless otherwise specified. (Note 2)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
V_PG(THRESH) PGOOD Threshold (Note 8)
R_PGOOD
PGOOD Output Resistance
I_PGOOD
PGOOD Hi-Z Leakage Current
Synchronous Buck Converter
PGOOD Low, Sinking 1mA
V_PGOOD = 6V
●
8
10
%
●
87 180
Ω
●
1
µA
I_BUCKFB
Feedback Current
(Note 5)
V_BUCKFB Regulated Feedback Voltage
(Note 5)
∆V_BUCKFB Feedback Voltage Line Regulation
V_IN = 2.7V to 5.5V (Note 5)
I_MAXP
Maximum Peak Inductor Current
V_BUCKFB = 0V, Duty Cycle < 35%
I_MAXN
NMOS Overcurrent Limit
Feedback Voltage Load Regulation
(with Respect to V_ITH)
V_ITH = 0.5V to 1V, V_MODESEL = V_IN (Note 5)
f_OSC
Oscillator Frequency
R_PFET
R_DS(ON) of P-Channel FET
I_SW = 500mA
R_NFET
R_DS(ON) of N-Channel FET
I_SW = –500mA
I_LSW
SW Leakage
V_ENBUCK = 0V, V_SW = 0V or 5.5V, V_IN = 5.5V
V_ENBUCK Buck Enable Pin Threshold
I_ENBUCK
Buck Enable Pin Leakage Current
V_ENBUCK = 5.5V, All Other Pins Grounded
V_MODESEL Mode Select Pin Threshold
I_MODESEL Mode Select Pin Leakage Current
V_MODESEL = 5.5V, All Other Pins Grounded
g_m
Error Amplifier Transconductance
V_ITH = 0.6V
Each VLDO: V_IN = 3.6V, V_LVIN = 1.5V, V_LVOUT = 1.2V, Unless Otherwise Specified
V_LVIN
LV_IN Pin Operating Voltage
(Note 6)
I_LVIN
LV_IN Pin Operating Current
I_OUT = 10µA
LV_IN Shutdown Current
V_ENLDO = 0V
V_LVFB
Feedback Pin Regulation Voltage (Note 7)
1mA ≤ I_OUT ≤ 300mA, 1.5V ≤ V_LVIN ≤ 5.5V
●
● 0.788 0.800
●
0.3
1.2 1.55
1.8
0.5
±30
0.812
0.5
2.0
● 1.8 2.25 2.7
0.13
0.14
±1
● 0.3 0.65
1
●
1
● 0.3 0.65
1
●
1
450 700 950
nA
V
mV/V
A
A
mV/V
MHz
Ω
Ω
µA
V
µA
V
µA
µA/V
● 0.9
5.5
V
●
3
20
µA
1.5
2
µA
0.395 0.400 0.405
V
● 0.392 0.400 0.408
V
I_LVFB
I_LVOUT(MAX)
Feedback Pin Input Current
Continuous Output Current
Short-Circuit Output Current
V_LVFB at Regulation
●
2
±10
nA
● 300
mA
760
mA
V_ENLDOx
I_ENLDOx
V_DO
LDO Enable Pin Threshold
LDO Enable Pin Leakage Current
Output Voltage Load Regulation
(Referred to the LV_FB Pin)
L_VFB Line Regulation (with Respect to
the L_VIN Pin)
L_VFB Line Regulation (with Respect to
the V_IN Pin)
LV_IN – LV_OUT Dropout Voltage
V_IN to LV_OUT Headroom Required for
Regulation (Note 3)
V_ENLDOx = 5.5V, All Other Pins Grounded
∆I_OUT = 1mA to 300mA
● 0.3 0.65
1
●
1
–1
V_LVIN = 1.5V to 5.5V, V_IN = 3.6V, V_LVOUT = 1.2V,
I_OUT = 1mA
V_LVIN = 1.5V, V_IN = 2.7V to 5.5V, V_LVOUT = 1.2V,
I_OUT = 1mA
V_IN = 2.8V, V_LVIN = 1.5V, V_LVFB = 0.37V,
I_OUT = 300mA (Note 9)
I_LVOUT = 300mA
l
7.5
0.44
68 175
1.4
V
µA
mV/A
µV/V
mV/V
mV
V
3446ff
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