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| MAX16922_10 Datasheet, PDF (3/17 Pages) Maxim Integrated Products – 2.2MHz, Dual, Step-Down DC-DC Converters, Dual LDOs, and RESET | |||
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2.2MHz, Dual, Step-Down DC-DC
Converters, Dual LDOs, and RESET
ELECTRICAL CHARACTERISTICS (continued)
(VPV1 = 13.5V, VPV2 = VPV3 = VOUT1, VPV4 = VOUT2; TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at
TA = +25°C under normal conditions, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
OUTS1 Discharge Resistance
EN = low (or optionally EN = high and
VPV1 < 5.7V)
OUT2âSYNCHRONOUS STEP-DOWN DC-DC CONVERTER
Supply-Voltage Range
VPV2 Fully operational
PWM Switching Frequency
fSW
Internally generated
Voltage Accuracy
VOUT2
Duty cycle = 20% to 90%;
ILOAD = 1mA to 600mA, PWM = high
SKIP mode (Note 4)
pMOS On-Resistance
VPV2 = 5.0V, ILX2 = 0.2A
nMOS On-Resistance
pMOS Current-Limit Threshold
VPV2 = 5.0V, ILX2 = 0.2A
nMOS Zero-Crossing Threshold
Soft-Start Ramp Time
70
â¦
2.7
5.5
V
2.0
2.2
2.4
MHz
-3
+3
%
-2
+4
%
150 250
mâ¦
200 350
mâ¦
0.75 0.9 1.05
A
50
mA
1.5
ms
Maximum Output Current
IOUT2 VOUT2 + 0.5V ⤠VPV2 ⤠5.5V
600
mA
LX2 Leakage Current
VPV2 = 6V, LX2 = PGND2 or VPV2;
TA = -40°C to +85°C
±1
µA
Duty-Cycle Range
Forced-PWM mode only, minimum duty
cycle in skip mode is 0% (Note 4)
15
100
%
OUTS2 Discharge Resistance
EN = 0V
70
â¦
OUT3âLDO REGULATOR
Input Voltage
Voltage Accuracy
VPV3
1.7
VOUT3 VOUT3 + 0.4V ⤠VPV3 ⤠5.5V, ILOAD = 1mA
-2
5.5
V
+2
%
Load Regulation
ILOAD = 0 to 300mA
-0.2
%
Dropout Voltage
Current Limit
Power-Supply Rejection Ratio
Shutdown Output Resistance
OUT4âLDO REGULATOR
Input Voltage
Voltage Accuracy
Load Regulation
Dropout Voltage
Current Limit
Power-Supply Rejection Ratio
Shutdown Output Resistance
THERMAL OVERLOAD
VPV3 = 1.8V, ILOAD = 250mA (Note 4)
IOUT3 = 30mA, f = 1kHz
EN = low
130 320
mV
450
mA
57
dB
1
kâ¦
VPV4
1.7
VOUT4 (VOUT4 + 0.4V) ⤠VPV4 ⤠5.5V, ILOAD = 1mA
-2
5.5
V
+2
%
ILOAD = 0 to 300mA
-0.2
%
VPV4 = 1.8V, ILOAD = 250mA (Note 4)
130 320
mV
450
mA
IOUT4 = 30mA, f = 1kHz
EN = low
57
dB
1
kâ¦
Thermal-Shutdown Temperature
(Note 4)
150
175
°C
Thermal-Shutdown Hysteresis
15
°C
_______________________________________________________________________________________ 3
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