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ISL9301IRZ

P1-P3P4-P6P7-P9P10-P12
4
FN6435.3
September 21, 2011
Block Diagram
Pin Descriptions
VIN - Power input. The absolute maximum input voltage is
28V. A 10µF or larger value capacitor is recommended to be
placed very close to the input pin for decoupling purposes.
Additional capacitance may be required to provide a stable
input voltage.
VBAT - Charger output pin. Connect this pin to the battery. A
1µF or larger X5R ceramic capacitor is recommended for
decoupling and stability purposes. When the BATON pin is
pulled to logic LOW or left floating, the VBAT pin is
disconnected from the IC.
TIME - Timing resistor pin. The TIME pin determines the
oscillation period by connecting a timing resistor between
this pin and GND. The oscillator also provides a time
reference for the charger calculated in Equation 1.
Where R
TIME
is in MΩ. The nominal timeout interval is given
by Equation 2:
Where t
OSC
is in seconds. For an 1MΩ R
TIME
, the nominal
timeout interval is approximately 5.6 hours.
PPR - Open-drain power presence indication. The
open-drain MOSFET turns on when the input voltage is
above the POR threshold but below the OVP threshold and
off otherwise. This pin is capable to sink 10mA (minimum)
current to drive a LED. The maximum voltage rating for this
pin is 7V.
CHG
- Open-drain charge indication pin. This pin outputs a
logic LOW when a charge cycle starts and turns to HIGH
when the end-of-charge (EOC) condition is qualified. This
pin is capable to sink 10mA min. current to drive an LED.
When the charger is disabled, the CH
G outputs high
impedance.
IMIN - End-of-charge (EOC) current program pin. Connect a
resistor between this pin and the GND pin to set the EOC
current. The EOC current IMIN can be programmed by
Equation 3:
Where R
IMIN
is in kΩ. The programmable range covers 5%
(or 10mA, whichever is higher) to 50% of IREF when
programmed to less than 5% or 10mA.
Cell1
CHG
IBAT_REF
VBAT_REF
VOUT_REF
VBAT
IREF
VOUT
1V
Die Temp
142 o
C
Die Temp
BATT OF
F
VBAT
VIN
1
1000
1
1000
PPR
IBAT
POR
Timer
EOC
Re-charge
OVP
DispIay
Logic
To s
y
stem load
CL
K
SHUTDOWN
TIME
0.2V
VIN
VBAT
115 o
C
VBAT
IBAT
VCC
COMP
COMP
QS
R
VOUT
IMIN
GND
BATON
BATT ON
SHUTDOWN
PPM CTRL
IOUT
IOUT
IREF
IBAT
To uP
Push 2S to turn on
RILIM
ILIM REF
RIMIN
RTIME
To USB or AC Adatper
t
OSC
75 R
TIME
×μs()=
(EQ. 1)
t
TIMEOUT
2
28
t
OSC
×
3600
-----------------------------
Hour()=
(EQ. 2)
I
MIN
3151
R
IMIN
----------------
mA()=
(EQ. 3)
ISL9301
5
FN6435.3
September 21, 2011
IREF - Charge-current program and monitoring pin. Connect
a resistor between this pin and the GND pin to set the
charge current limit determined by Equation 4:
Where R
IREF
is in kΩ. The IREF pin voltage also monitors
the actual charge current during the entire charge cycle,
including the trickle, constant-current, and constant-voltage
phases. When disabled, V
IREF
= 0V.
BATON - Battery disconnect pin. The BATON pin is a logic
input pin to allow the disconnection of the battery from the
system to eliminate the unwanted drainage current from the
battery. There is an internal 1MΩ pull-down resistor at this
pin. Drive to HIGH to connect the battery to the system.
When this pin is driven to LOW or left floating, the battery is
disconnected from the system.
VOUT - Output connection to the system. This pin provides
a 4.5V regulated voltage for the system when a valid input
power is present. If no valid input is present, and BATON is
driven HI, the VOUT pin is connected to VBAT through an
internal MOSFET. If no valid input is present and BATON is
LOW, the voltage at VOUT pin is zero. A 4.7µF or larger X5R
ceramic capacitor is recommended for decoupling and
stability purposes.
EPAD - Exposed pad. Connect as much copper as possible
to this pad either on the component layer or other layers
through thermal vias to enhance the thermal performance.
I
REF
3886
R
IREF
-----------------
mA()=
(EQ. 4)
FIGURE 1. TYPICAL CHARGING CYCLE
I
REF
CC CV
I
MIN
4.2V
TIME
2.8V
CHG
CHARGE
CURRENT
CHARGE
VOLTAGE
CHG
INDICATION
V
REC
16%I
REF
TIMEOUT
TRICKLE
ISL9301
6
FN6435.3
September 21, 2011
Typical Application Circuit
Theory of Operation
When a valid input voltage is applied at VIN, the ISL9301
first regulates V
OUT
at 4.5V for system power need. In the
mean time, if the battery is attached, the ISL9301 also
charges the battery while supplying current to the system.
When the system exceeds the maximum available current,
either limited by the IC or by the input power supply, the
charger FET is operated in a reverse mode, i.e. it discharges
current to the system instead of charging.
The charger function is similar to other Li-ion battery
chargers, i.e. it charges the battery at a constant current
(CC) or a constant voltage (CV) depending on the battery
terminal voltage. The constant current I
REF
is set with the
external resistor R
IREF
, as shown in the “Typical Application
Circuit” on page 6. The constant voltage is fixed at 4.2V. If
the battery voltage is below a typical 2.8V trickle charge
threshold, the ISL9301 charges the battery with a trickle
current (~16% of the programmed constant current) until the
battery voltage rises above the trickle charge threshold.
When the battery voltage reaches the final voltage of 4.2V,
the charger enters the CV mode and regulates the battery
voltage at 4.2V to fully charge the battery without the risk of
overcharging. Upon reaching an end-of-charge (EOC)
current, the charger indicates the charge completion with the
CHG
pin, but the charger continues to deliver 4.2V at the
VBAT pin until the timeout limit has reached. Figure 1 shows
the typical charge profile with the EOC/reset events.
The EOC current level IMIN is programmable with the
external resistor R
IMIN
. The CHG signal turns to LO when
the trickle charge starts and rises to HIGH at an EOC event.
After the EOC is reached, the CHG
status is latched at HI.
The CHG
status will be reset to logic LO when the V
BAT
voltage drops to below the recharge threshold (4.05V), as
shown in Figure 1.
A thermal foldback function reduces the charge current
anytime when the die temperature reaches typically +115°C.
This function guarantees safe operation when the
printed-circuit board (PCB) is not capable of dissipating the
heat generated by the linear charger.
ISL9301
VIN
VBAT
VOUT
IREF
IMIN
CHG
TIME
TO SYS
INPUT
PPR
R
TIME
R
IMIN
R
IREF
R
1
R
2
D
2
D
1
GND
BATON
TO µP
PRESS AND HOLD 2s TO TURN ON
C
1
C
2
C
3
BATT
R
3
PART DESCRIPTION
C
1
10µF X5R ceramic capacitor
C
2
1µF X5R ceramic capacitor
C3 4.7µF X5R ceramic capacitor
R
3
1Ω, 5% resistor
R
IREF
26.7kΩ, 1%, for 150mA charge current
R
IMIN
137kΩ, 1%, for 23mA EOC current
R
TIME
1MΩ, 1% resistor for 75µs clock period
R
1
, R
2
470Ω, 5% resistor
D
1
, D
2
LEDs for indication
ISL9301
P1-P3P4-P6P7-P9P10-P12

ISL9301IRZ

Mfr. #:
Buy ISL9301IRZ
Manufacturer:
Renesas / Intersil
Description:
Battery Management BATRY CHRGR W/PWR PATH MGT/TIMR 10LD
Lifecycle:
New from this manufacturer.
Delivery:
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