Datasheet

MAX8819A/MAX8819B/MAX8819C
ELECTRICAL CHARACTERISTICS (continued)
(DC, LX_ unconnected; V
EP
= V
GND
= 0V, V
BAT
= 4V, DLIM[1:2] = 00, EN123 = EN4 = low, V
FB1
= V
FB2
= V
FB3
= 1.1V, V
FB4
= 0.6V,
PV13 = PV2 = SYS, T
A
= -40°C to +85°C, capacitors as shown in Figure 1, R
CISET
= 3kΩ, unless otherwise noted.) (Note 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Skip-Mode Transition Current (Note 8) 80 mA
n-Channel Zero-Crossing
Threshold
10 mA
Maximum Duty Cycle 100 %
Minimum Duty Cycle 12.5 %
PWM Frequency f
OSC
1.8 2.0 2.2 MHz
Internal Discharge Resistance in
Shutdown
EN123 = low, resistance from LX1 to PG1 1.0 kΩ
REG2–SYNCHRONOUS STEP-DOWN CONVERTER
Input Voltage PV2 supplied from SYS V
SYS
V
MAX8819A/MAX8819B 300
Maximum Output Current
L = 4.7μH,
R
LSR
= 0.13Ω
(Note 6)
MAX8819C 500
mA
Short-Circuit Current L = 4.7μH, R
LSR
= 0.13Ω 600 mA
Short-Circuit Detection Threshold 230 mV
Short-Circuit Foldback Frequency f
OSC
/3 Hz
FB2 Voltage (Note 7) 0.997 1.012 1.028 V
Output Voltage Range 1V
SYS
V
T
A
= +25°C -50 -5 +50
FB2 Leakage Current V
FB2
= 1.01V
T
A
= +85°C -50
nA
Load Regulation I
OUT2
= 100mA to 300mA 1 %
Line Regulation (Note 9) 1 %/D
p-Channel On-Resistance V
PV2
= 4.0V, I
LX2
= 180mA 290 mΩ
n-Channel On-Resistance V
PV2
= 4.0V, I
LX2
= 180mA 200 mΩ
MAX8819A/MAX8819B 0.512 0.550 0.595
p-Channel Current-Limit
Threshold
MAX8819C 0.565 0.600 0.700
A
Skip-Mode Transition Current (Note 8) 80 mA
n-Channel Zero-Crossing
Threshold
10 mA
Maximum Duty Cycle 100 %
Minimum Duty Cycle 12.5 %
PWM Frequency f
OSC
1.8 2.0 2.2 MHz
Internal Discharge Resistance in
Shutdown
EN123 = low, resistance from LX2 to PG2 1.0 kΩ
REG2 Disable ΔI
SYS
V
PV2
= 0V, REG2 disabled (Note 10) -25 μA
REG3–SYNCHRONOUS STEP-DOWN CONVERTER
Input Voltage PV13 supplied from SYS V
SYS
V
PMIC with Integrated Chargers and Smart
Power Selector in a 4mm x 4mm TQFN
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