ISL6292BCRZ Intersil, ISL6292BCRZ Datasheet - Page 9

• Manufacturer Part Number: ISL6292BCRZ
• Description: IC CHARGER LI-ION 4.2V 4X4 16QFN
• Manufacturer: Intersil

Specifications of ISL6292BCRZ

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Voltage - Supply: 4.3 V ~ 6.5 V
• Operating Temperature: -20°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 16-VQFN Exposed Pad, 16-HVQFN, 16-SQFN, 16-DHVQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

C
Application circuit. A 1nF capacitor leads to 14 minutes of
TIMEOUT. For example, a 15nF capacitor sets the
TIMEOUT to be 3.5 hours. The charger is terminated when
the TIMEOUT is reached.
The trickle mode charge has a time limit of 1/8 TIMEOUT. If
the battery voltage does not reach V
TIMEOUT fault is issued and the charger latches up. The
charger stays in trickle mode for at least 15 cycles of the
internal oscillator and, at most, 1/8 of TIMEOUT.
Recharge Threshold
The charger terminates when the TIMEOUT limit expires.
After the termination, if the battery is below the recharge
threshold given in the Electrical Specification table, the
charger starts a re-charge cycle.
LED Indications
RED and GRN are two open-drain outputs that directly drive
a tri-color LED. At the moment when the power is applied or
when the charger is enabled through the EN pin, the charger
starts to charge and the RED indication pin outputs a low
impedance to drive a red LED. Once the charge finishes
(either when the EOC condition is qualified or when the
TIMEOUT completes), the GRN pin turns on to drive a green
LED and the red LED is off. The green LED remains on
unless the input power is recycled, or when the EN pin is
toggled, or a fault case happens. When a recharge occurs,
the indication remains in green.
When a fault case happens, both the RED and the GRN pins
are on to indicate a yellow color. If the FAULT is a TIMEOUT
fault, the yellow indication is latched and can only be reset
through the EN pin or the input power. If the FAULT is an
ambient temperature FAULT, the charger restarts after the
fault condition is removed. When not powered or when not
enabled, both LEDs are off. Table 1 summarizes the LED
indications.
TIME
FIGURE 5. THE INTERNAL VOLTAGE FEEDBACK CIRCUIT
is the timing capacitor shown in the Typical
Enable
VA
+
-
V
REF
Q1
R 3
R 2
9
VSEN
BA T
MIN
R 1
10Ω
within that limit, a
ISL6292B
VSEN Pin
The VSEN pin allows remote sensing of the battery voltage
to minimize the resistive voltage drop between the charger
output and the battery positive terminal. Figure 5 shows the
internal voltage feedback circuit. In applications that the
remote sense pin goes through a connector, a local low-
value resistor is recommended, as the R
in case the connector has bad contact. The sum of R
R
voltage accuracy.
Ambient Temperature Sensing
The TEMP pin is used to set the ambient temperature range
that allows charging the battery. Typically, an NTC (negative
temperature coefficient) resistor is mounted on the printed
circuit board (PCB) to monitor the ambient temperature. Due
to the self-heating of the PCB during charging, the ISL6292B
provides the DT pin to set a higher temperature threshold
after the charger starts.
Figure 6 shows the internal circuit for the ambient
temperature sensing function. The two comparators form a
window comparator whose high-threshold is V
threshold is V
Electrical Specifications. The two MOSFETs (Q1 and Q2)
Charging
Full Charge (EOC), or recharging
Trickle TIMEOUT Error
Over/Under Ambient Temperature
No Battery
3
Over
Temp
FIGURE 6. THE INTERNAL AND EXTERNAL CIRCUIT FOR
Under
Temp
is 75kΩ, therefore, a 10Ω R
CP1
CP2
TABLE 1. LED INDICATION SUMMARY
STATUS
THE NTC INTERFACE
TMAX
+
+
-
-
. These two thresholds are given in the
V
TM AX
V
To TEMP Pin
TM IN
CHG
Q 1
Q 2
1
RED GRN
is negligible in output
H
H
L
L
L
2.9V
Q 3
R 1
100K
R 2
75K
R 4
4K
R 3
25K
H
H
L
L
L
1
shown in Figure 5,
V2P9
TEMP
Red
Green
Yellow (Latched)
Yellow
Off
D T
GND
INDICATION
TMIN
R
April 19, 2005
R
T
R
and low-
U
D
2
FN9139 .1
and