Rainbow Electronics MAX8621Z - Manual (Page 5)

MAX8621Y/MAX8621Z
Dual Step-Down DC-DC Power-Management ICs
for Portable Devices
_______________________________________________________________________________________ 5
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
Power-Supply Rejection
∆V
OUT3 / ∆V
IN2
10Hz to 10kHz, C OUT3 = 2.2µF, I LOAD = 30mA 60 dB
Output Noise Voltage (RMS) 100Hz to 100kHz, C OUT3 = 2.2µF, I LOAD = 30mA 45 µV RMS
Output Capacitor for Stable
Operation
0 < I
LOAD
< 150mA 2.2 µF
OUT4 (LDO4)
V OUT(NOM)
≥ 1.8V -1.3 +0.3 +2.0 T A = 0°C to
+85°C V OUT(NOM) = 1.5V -1.30 +0.3 +2.35
I LOAD = 1mA, 3.7V ≤
V IN_
≤ 5.5V, relative to
V OUT(NOM) T A = -40°C to +85°C -2.3 +2.5
Output Voltage Accuracy
I LOAD = 75mA, relative to V OUT(NOM) 0
%
Output Current 150 mA
Current Limit V OUT4 = 0V 165 360 650 mA
Dropout Voltage I LOAD = 100mA, T A = +85°C 100 210 mV
Load Regulation 1mA < I
LOAD
< 150mA, V
SEL1
= V
SEL2
= 0 0.6 %
Power-Supply Rejection
∆V
OUT4 / ∆V
IN2
10Hz to 10kHz, C OUT4 = 2.2µF, I LOAD = 30mA 60 dB
Output Noise Voltage (RMS) 100Hz to 100kHz, C OUT4 = 2.2µF, I LOAD = 30mA 45 µV RMS
Output Capacitor for Stable
Operation
0 < I LOAD < 150mA 2.2 µF
DRIVER (DR)
ENDR Turn-On Threshold I DR = 1mA 0.65 V
ENDR Input Current V
ENDR
= 0V and 5.5V -1 +1 µA
DR Output Low Voltage I DR = 150mA, V ENDR = 3.7V 0.2 0.4 V
DR Off-Current (Leakage) V DR = V IN = 5.5V, V ENDR = 0V -1 +1 µA
RESET
Output High Voltage
V OUT1
- 0.3V
V
Output Low Voltage I SINK = 1mA 0.3 V
RESET Threshold Percentage of nominal OUT1 rising when RESET falls 84 87 90 %
RESET Active Timeout Period From OUT1 ≥ 87% until RESET = HIGH 60 ms
Pullup Resistance to OUT1 8 14 20 k Ω
Note 1: V
IN1
, V
IN2
, and V
IN3
are shorted together and single input is referred to as V
IN
.
Note 2: All units are 100% production tested at T
A
= +85°C. Limits over the operating range are guaranteed by design.
Note 3: OUT1, OUT2, OUT3, OUT4, LX1, and LX2 to ground.
Note 4: When the input voltage is greater than 2.85V (typ), the UVLO comparator trips and the threshold is reduced to 2.35V (typ).
This allows the system to start normally until the input voltage decays to 2.35V.