MAX8903A Ver la hoja de datos (PDF) - Maxim Integrated
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MAX8903A Datasheet PDF : 20 Pages
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2A 1-Cell Li+ DC-DC Charger for USB*
and Adapter Power
ABSOLUTE MAXIMUM RATINGS
DC, LX, DCM to GND .............................................-0.3V to +20V
DC to SYS .................................................................-6V to +20V
BST to GND ...........................................................-0.3V to +26V
BST TO LX ................................................................-0.3V to +6V
USB to GND .............................................................-0.3V to +9V
USB to SYS..................................................................-6V to +9V
VL to GND ................................................................-0.3V to +6V
THM, IDC, ISET, CT to GND .........................-0.3V to (VL + 0.3V)
DOK, FLT, CEN, UOK, CHG, USUS,
BAT, SYS, IUSB, CS to GND ................................-0.3V to +6V
SYS to BAT ...............................................................-0.3V to +6V
PG, EP (exposed pad) to GND .............................-0.3V to +0.3V
DC Continuous Current (total in two pins)......................2.4ARMS
USB Continuous Current.......................................................1.6A
LX Continuous Current (total in two pins).......................2.4ARMS
CS Continuous Current (total in two pins) ......................2.4ARMS
SYS Continuous Current (total in two pins) .......................3ARMS
BAT Continuous Current (total in two pins) .......................3ARMS
Continuous Power Dissipation (TA = +70°C)
28-Pin Thin QFN-EP
Multilayer (derate 28.6mW/°C above +70°C) ..........2286mW
28-Pin Thin QFN-EP
Single-Layer (derate 20.8mW/°C above +70°C)...1666.7mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature Range ............................-40°C to +150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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.
ELECTRICAL CHARACTERISTICS
(VDC = VUSB = 5V, VBAT = 4V, circuit of Figure 2, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
(Note 1)
PARAMETER
DC INPUT
DC Operating Range
DC Undervoltage Threshold
DC Overvoltage Threshold
DC Supply Current
DC High-Side Resistance
DC Low-Side Resistance
DC-to-BAT Dropout Resistance
DC-to-BAT Dropout Voltage
Switching Frequency
DC Step-Down Output Current-
Limit Step Range
DC Step-Down Output Current
Limit
DC Soft-Start Time
CONDITIONS
When VDOK goes low, VDC
No valid USB input
rising, 500mV typical hysteresis Valid USB input
When VDOK goes high, VDC rising, 500mV typical
hysteresis
Charger enabled, no switching, VSYS = 5V
Charger enabled, f = 3MHz, VDC = 5V
Charger enabled, VCEN = 0V, 100mA USB mode (Note 2)
Charger enabled, VCEN = 5V, 100mA USB mode (Note 2)
VDCM = 0V, VUSUS = 5V
When SYS regulation and charging stops, VDC falling,
200mV hysteresis
VDC = 8V, VBAT = 4V
VDC = 5V, VBAT = 3V
VDC = 6V, VSYS = 4V
No valid USB input
RIDC = 3kΩ
RIDC = 6kΩ
RIDC = 12kΩ
Valid USB input before soft-start
MIN
4.15
3.9
4.0
16.5
0
0.5
1900
950
450
TYP
4.0
4.3
17
2.3
15
1
1
0.10
0.15
0.15
0.31
15
4
3
2000
1000
500
1
20
MAX UNITS
16
V
4.1
V
4.4
17.5
V
4
2
mA
2
0.25
Ω
Ω
Ω
30
mV
MHz
2
A
2100
1050
mA
550
ms
µs
2 _______________________________________________________________________________________
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