Rainbow Electronics MAX8621Z - Manual (Page 3)

MAX8621Y/MAX8621Z
Dual Step-Down DC-DC Power-Management ICs
for Portable Devices
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V IN = 3.7V, C IN1 = 10µF, C IN2 = C IN3 = 4.7µF, C OUT1 = C OUT2 = 4.7µF, C OUT3 = C OUT4 = 2.2µF, C REFBP = 0.01µF, T A = -40°C to
+85°C, unless otherwise noted. Typical values are at T A = +25°C.) (Notes 1, 2)
PARAMETER CONDITIONS MIN TYP MAX UNIT
Tristate High Input Threshold
Hysteresis
SEL_ 50 mV
PWRON, EN2 Pulldown Resistor
to GND
400 800 1600 k Ω
STEP-DOWN DC-DC CONVERTER 1 (BUCK1)
Supply Current I LOAD = 0A, no switching 40 µA
Output Voltage Range 0.6 3.3 V
FB1 Threshold Voltage V FB1 falling 0.603 V
FB1 Threshold Line Regulation 2.6V ≤ V
IN
≤ 5.5V 0.3 %/V
FB1 Threshold Voltage Hysteresis
(% of V
FB1 )
1 %
Shutdown 0.01
FB1 Bias Current
V FB1 = 0.5V 0.01
µA
p-MOSFET switch (I LIMP ) 670 1000 1500
Current Limit
n-MOSFET rectifier (I LIMN ) 750 1000 1330
mA
p-MOSFET switch, I LX1 = -40mA 0.65 1.5
On-Resistance
n-MOSFET rectifier, I LX1 = 40mA 0.35 0.8
Ω
Rectifier Off-Current Threshold I LXOFF 45 70 mA
t
ON
107
Minimum On- and Off-Times
t OFF 95
ns
STEP-DOWN DC-DC CONVERTER 2 (BUCK2)
Supply Current I LOAD = 0A, no switching 40 µA
Output Voltage Range 0.6 3.3 V
FB2 Threshold Voltage V FB2 falling 0.603 V
FB2 Threshold Line Regulation 2.6V ≤ V
IN
≤ 5.5V 0.3 %/V
FB2 Threshold Voltage Accuracy
(Falling) (% of VFB2)
I LOAD = 0A -2.5 +2.5 %
FB2 Threshold Voltage Hysteresis
(% of VFB2)
1 %
Shutdown 0.01
FB2 Bias Current
V FB = 0.5V 0.01
µA
p-MOSFET switch 670 1000 1500
Current Limit
n-MOSFET rectifier 750 1000 1330
mA
p-MOSFET switch, I LX2 = -40mA 0.65 1.5
On-Resistance
n-MOSFET rectifier, I LX2 = 40mA 0.35 0.8
Ω
Rectifier Off-Current Threshold I LXOFF 45 70 mA
t ON 107
Minimum On- and Off-Times
t
OFF
95
ns