FUNCTIONAL DEVICE OPERATION
BATTERY INTERFACE AND CONTROL
Table 64. Charge Path Regulator Characteristics
Parameter
Condition
Min
Typ
Max
Units
Input Operating Voltage
CHRGRAW
BATTMIN
-
17
V
Output voltage trimming accuracy
VCHRG[2:0] = 011
-
-
0.35
%
Charge current 50 mA at T = 25 °C
Output Voltage Spread
VCHRG[2 :0] = 011, 1xx
Charge current 1.0 to 100 mA
Charge current > 100 mA and above
ICHRG[3:0] =0 001
-
-
-
-1.5
-3.0
68
360
500
-
-
-
1.5
1.5
92
%
%
Current Limit Tolerance(65)
80
400
560
-
mA
mA
mA
%
ICHRG[3:0] = 0100
440
620
15
ICHRG[3:0] = 0110
All other settings
Start-up Overshoot
Configuration
Input Capacitance
Load Capacitor
Cable Length
Notes
Unloaded
-
-
2.0
%
CHRGRAW (66)
-
10
-
2.2
-
μF
μF
m
BPSNS (66)
-
-
4.7
3.0
(67)
65. Excludes spread and tolerances due to board routing and 100 mOhm sense resistor tolerances.
66. An additional derating of 35% is allowed.
67. This condition applies when using an external charger with a 3.0 m long cable.
OVER-VOLTAGE PROTECTION
In order to protect the application, the voltage at the CHRGRAW pin is monitored. When crossing the threshold, the charge
path regulator will be turned off immediately, by opening M1 and M2, while M3 gets closed. When the over-voltage condition
disappears for longer than the debounce time, charging will resume and previously programmed SPI settings will be reloaded.
An interrupt CHGFAULTI is generated with associated CHGFAULTM mask bit with the CHGFAULTS[1:0] bits set to 01.
In order to ensure immediate protection, the control of M1, M2, and M3 occurs real-time, so asynchronously to the charger
state machine. As a result, for over-voltage conditions of up to 30 μs, the charger state machine may not always end up in the
over-voltage fault state, and therefore an interrupt may not always be generated.
Table 65. Charger Over-voltage Protection Characteristics
Parameter
Condition
High to Low, Low to High
High to Low
Min
16
-
Typ
-
Max
20
-
Units
V
Over-voltage Comparator High Voltage Threshold
Over-voltage Comparator Debounce Time
10
ms
The VBUS pin is also protected against over-voltages. This will occur at much lower levels for CHRGRAW. When a VBUS
over-voltage is detected the internal circuitry of the USB block is disconnected. A USBOVI is generated in this case. For more
details see Connectivity.
When the maximum voltage of the IC is exceeded, damage will occur to the IC and the state of M1 and M2 cannot be
guaranteed. If the user wants to protect against these failure conditions, additional protection will be required.
13892
Analog Integrated Circuit Device Data
Freescale Semiconductor
91
FREESCALE [ Freescale ]
