Rainbow Electronics MAX8621Z User Manual
Page 2
MAX8621Y/MAX8621Z
Dual Step-Down DC-DC Power-Management ICs
for Portable Devices
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(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)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note 1: LX_ has internal clamp diodes to GND and IN1. Applications that forward-bias these diodes should take care not to exceed
the IC’s package dissipation limits.
PWRON, IN1, IN2, IN3, RESET, FB1, FB2,
ENDR, REFBP, SEL1, SEL2 to GND..................-0.3V to +6.0V
EN2, EN3, EN4, DR to GND.......................-0.3V to (V
IN3
+ 0.3V)
OUT1, OUT2, OUT3, OUT4 to GND...........-0.3V to (V
IN2
+ 0.3V)
PGND1, PGND2 to GND ......................................-0.3V to + 0.3V
LX1, LX2 Current ..........................................................±1.5A
RMS
LX1, LX2 to GND (Note 1) ..........................-0.3V to (V
IN1
+ 0.3V)
DR Current......................................................................0.5A
RMS
Continuous Power Dissipation (T
A
= +70°C)
24-Pin 4mm x 4mm Thin QFN
(derate 27.8mW/°C above +70°C) ..........................2222.2mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
Input Supply Range
After startup
2.6
5.5
V
Shutdown Supply Current
V
IN
= 4.2V (Note 3)
2
15
µA
V
IN
= 3.7V; BUCK1, BUCK2, OUT1, OUT2 on; other
circuits off
160
300
No-Load Supply Current
VIN = 3.7V, BUCK1 and BUCK2 on, all LDOs on
275
µA
Light-Load Supply Current
V
IN
= 3.7V, BUCK1 and BUCK2 with 500µA load each,
OUT1 and OUT2 on, other circuits off
710
µA
UNDERVOLTAGE LOCKOUT
V
IN
rising
2.70
2.85
3.05
Undervoltage Lockout (Note 4)
V
IN
falling
2.35
2.55
V
THERMAL SHUTDOWN
Threshold
T
A
rising
+160
°C
Hysteresis
15
°C
REFERENCE
Reference Bypass Output
Voltage
T
A
= 0°C to +85°C
1.235
1.250
1.265
V
REF Supply Rejection
2.6V
≤ V
IN
≤ 5.5V
0.2
mV/V
LOGIC AND CONTROL INPUTS
Input Low Level
PWRON, EN2, EN3, EN4; 2.6V
≤ V
IN
≤ 5.5V
0.4
V
PWRON, EN2, EN3, EN4; 2.6V
≤ V
IN
≤ 4.2V
1.44
1.12
Input High Level
PWRON, EN2, EN3, EN4; 2.6V
≤ V
IN
≤ 5.5V
1.25
V
Logic Input Current
EN3, EN4; 0V < V
IN
< 5.5V
-1
+1
µA
Tristate Low Input Threshold
SEL_
0.3
0.7
1.0
V
Tristate Low Input Threshold
Hysteresis
SEL_
50
mV
Tristate High Input Threshold
SEL_
V
IN
-
1.2V
V
IN
-
0.8V
V
IN
-
0.4V
V