MAX38888
2.5V to 5.0V, 0.5A/2.5A Reversible Buck/Boost
Regulator for Backup Power Applications
Absolute Maximum Ratings
CAP, EN, SYS, LX, BKUPB, RDY to GND............... -0.3V to +6V
FBCH, FBCL to GND....................................-0.3V to CAP + 0.3V
FBS, ISET to GND........................................ -0.3V to SYS + 0.3V
PGND to GND ....................................................... -0.3V to +0.3V
Operating Temperature Range...........................-40°C to +125°C
Storage Temperature Range ..............................-65°C to +150°C
Maximum Junction Temperature ......................................+150°C
Lead Temperature (soldering, 10 seconds)......................+300°C
Continuous Power Dissipation (T = +70°C, TDFN,
LX RMS Current........................................................... ±2.0A
A
RMS
derate 24.4mW/°C above +70°C) ............................ 1951.2mW
Output Short-Circuit Duration......................................Continuous
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.
Package Information
TDFN
Package Code
T1433+2C
21-0137
90-0063
Outline Number
Land Pattern Number
THERMAL RESISTANCE, FOUR-LAYER BOARD
Junction-to-Ambient (θ
)
41°C/W
8°C/W
JA
Junction-to-Case Thermal Resistance (θ
)
JC
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages.
Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different
suffix character, but the drawing pertains to the package regardless of RoHS status.
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a
four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/
thermal-tutorial.
Electrical Characteristics
(V
= 3.7V, V
= 2.7V, T = -40°C to +125°C (typical values at T = +25°C), circuit of Figure 1, unless otherwise specified.)
SYS
CAP
J
J
PARAMETER
SYMBOL
CONDITIONS
MIN
2.5
TYP
MAX
5
UNITS
SYS Voltage Range
CAP Voltage Range
V
VSYS
V
V
V
VSC
0.8
4.5
1
EN = 0V, T = +25°C
0.01
0.1
A
SYS Shutdown Current
I
μA
SYS_SD
EN = 0V
SYS Charging Supply
Current
I
V
V
= 0.6V, V
= V = 0.485V
FBCL
1.5
mA
SYS_CHG
FBS
FBCH
= V
= V
= 0.515V, T
=
A
FBS
FBCH
FBCH
FBCL
35
35
65
SYS Backup Supply
Current
+25°C
I
μA
SYS_BUP
V
= V
= V
= 0.515V
FBS
FBS
FBCL
V
= 0.6V, V
= V
= V
= 0.515V,
= 0.515V
FBCH
FBCL
2.5
5
1
SYS Ready Supply
Current
T
A
= +25°C
I
μA
μA
SYS_RDY
V
FBS
= 0.6V, V
2.5
0.01
0.1
FBCH
FBCL
EN = 0V, T = +25°C
A
CAP Shutdown Current
I
CAP_SD
EN = 0V
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