MAX8903DETI+ Maxim Integrated Products, MAX8903DETI+ Datasheet - Page 11

• Manufacturer Part Number: MAX8903DETI+
• Description: IC DC/DC CHARGER LI+ 2A 28-TQFN
• Manufacturer: Maxim Integrated Products
• Series: Smart Power Selector™r

Specifications of MAX8903DETI+

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 4.1 V ~ 16 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

V
V
I
I
SYS
USB
USB
BAT
(T
A
PIN
1, 2
3, 4
= +25°C, unless otherwise noted.)
10
11
12
-330mA
475mA
5
6
7
8
9
USB DISCONNECT WITH NO DC
3.6V
5V
(R
SYS
NAME
100μs/div
DCM
IUSB
GND
DOK
BST
IDC
DC
PG
VL
CT
= 25Ω)
______________________________________________________________________________________
144mA
Power Ground for Step-Down Low-Side Synchronous n-Channel MOSFET. Both PG pins must be
connected together externally.
DC Power Input. DC is capable of delivering up to 2A to SYS. DC supports both AC adapter and USB
inputs. The DC current limit is set through DCM, IUSB, or IDC depending on the input source used. See
Table 2. Both DC pins must be connected together externally. Connect at least a 4.7μF ceramic capacitor
from DC to PG.
Current-Limit Mode Setting for the DC Power Input. When logic-high, the DC input current limit is set by
the resistance from IDC to GND. When logic-low, the DC input current limit is internally programmed to
500mA or 100mA, as set by the IUSB logic input. There is an internal diode from DCM (anode) to DC
(cathode) as shown in Figure 1.
High-Side MOSFET Driver Supply. Bypass BST to LX with a 0.1μF ceramic capacitor.
USB Current-Limit Set Input. Drive IUSB logic-low to set the USB current limit to 100mA. Drive IUSB logic-
high to set the USB current limit to 500mA.
DC Power-OK Output. Active-low open-drain output pulls low when a valid input is detected at DC. DOK
is still valid when the charger is disabled (CEN high).
Logic LDO Output. VL is the output of an LDO that powers the MAX8903_ internal circuitry and charges
the BST capacitor. Connect a 1μF ceramic capacitor from VL to GND.
Charge Timer Set Input. A capacitor (C
Connect to GND to disable the timer.
DC Current-Limit Set Input. Connect a resistor (R
step-down regulator from 0.5A to 2A when DCM is logic-high.
Ground. GND is the low-noise ground connection for the internal circuitry.
MAX8903A toc26
2A 1-Cell Li+ DC-DC Chargers for USB
2V/div
5V/div
500mA/div
500mA/div
V
USUS
V
I
I
USB
SYS
BAT
-475mA
475mA
Typical Operating Characteristics (continued)
3.7V
0V
USB SUSPEND
3V
0A
0A
200μs/div
CT
) from CT to GND sets the fast-charge and prequal fault timers.
MAX8903A toc27
FUNCTION
IDC
) from IDC to GND to program the current limit of the
and Adapter Power
5V/div
500mA/div
2V/div
500mA/div
V
USUS
V
I
I
USB
SYS
BAT
3V
0A
0A
3.6V
C
CHARGING
USB
BATTERY
CHARGER
SOFT-START
Pin Description
USB RESUME
0V
200μs/div
3.8V
MAX8903A toc28
475mA
-475mA
3.6V
5V/div
500mA/div
2V/div
500mA/div
11