TI1 BQ2954PN Lithium ion charge management ic Datasheet

bq2954
Lithium Ion Charge Management IC
with Integrated Switching Controller
Features
General Description
➤ Safe charge of Li-Ion battery
packs
The bq2954 Li-Ion Charge-Management IC uses a flexible pulse-width
modulation regulator to control voltage and current during charging.
The regulator frequency is set by an
external capacitor for design flexibility. The switch-mode design minimizes power dissipation.
➤ Pulse-width modulation control
for current and voltage regulation
➤ Programmable high-side/low-side
current-sense
➤ Fast charge terminated by selectable minimum current; safety
backup termination at maximum
time
➤ Pre-charge qualification detects
shorted or damaged cells and
conditions battery
➤ Charging continuously qualified
by temperature and voltage limits
➤ Direct LED control outputs to
display charge status and fault
conditions
Pin Connections
The bq2954 charges a battery in two
phases. First a constant-current
phase replenishes approximately
70% of battery capacity. Then a voltage-regulation phase completes the
battery charge.
The bq2954 provides status indications of all charger states and faults
for accurate determination of the
battery and charge-system conditions.
For safety, the bq2954 inhibits fast
charging until the battery voltage
and temperature are within configured limits. If the battery voltage is
less than the low-voltage threshold,
the bq2954 provides low-current
conditioning of the battery.
For charge qualifiction, the bq2954
uses an external thermistor to measure battery temperature. Charging
begins when power is applied or the
battery is inserted
Pin Names
TM
Time-out programming
input
CHG
Charge active output
TM
1
16
LED2/DSEL
CHG
2
15
LED1/CSEL
BAT
Battery voltage input
BAT
3
14
MOD
VCOMP
Voltage loop comp input
VCOMP
4
13
VCC
ICOMP
Current loop comp input
ICOMP
5
12
VSS
ITERM
ITERM
6
11
LCOM
Minimum current
termination select input
SNS
7
10
BTST
SNS
Sense resistor input
TS
8
9
TPWM
TS
Temperature sense input
16-Pin Narrow
DIP or SOIC
PN295401.eps
SLUS064–OCTOBER 1998 B
1
TPWM
Regulator timebase input
BTST
Battery test output
LCOM
Common LED output
VSS
System ground
VCC
5.0V± 10% power
MOD
Modulation control
output
LED1/
CSEL
Charge status output 1/
Charge sense select
input
LED2/
DSEL
Charge status output 2/
Display select input
bq2954
TPWM
Pin Descriptions
TM
Uses an external timing capacitor to ground
to set the pulse-width modulation (PWM)
frequency. See Equation 7.
Time-out programming input
Sets the maximum charge time. The resistor
and capacitor values are determined using
Equation 5. Figure 10 shows the resistor/capacitor connection.
CHG
BAT
VCOMP
BTST
Charge active output
An open-drain output is driven low when the
battery is removed, during a temperature
pend, when a fault condition is present, or
when charge is done. CHG can be used to
disable a high-value load capacitor to detect
quickly any battery removal.
LCOM
Battery voltage input
VSS
Ground
Sense input. This potential is generally developed using a high-impedance resistor divider network connected between the positive and the negative terminals of the battery. See Figures 6 and 7 and Equation 1.
VCC
VCC supply
5.0V, ±10%
MOD
Current loop compensation input
LED1–
LED2
Charger display status 1–2 outputs
Drivers for the direct drive of the LED display. These outputs are tri-stated during
initialization so that DSEL and CSEL can be
read.
Charge full and minimum current termination select
DSEL
Charging current sense input
Display select input (shared pin with
LED2)
Three-level input that controls the LED1–2
charge display modes.
Battery current is sensed via the voltage developed on this pin by an external sense-resistor.
TS
Current-switching control output
Pulse-width modulated push/pull output used
to control the charging current to the battery.
MOD switches high to enable current flow and
low to inhibit current flow. (The maximum
duty cycle is 80%.)
Voltage loop compensation input
Three-state input is used to set IFULL and
IMIN for fast charge termination. See Table 4.
SNS
Common LED output
Common output for LED1-2. This output is
in a high-impedance state during initialization to read programming input on DSEL
and CSEL.
Connects to an external R-C network to stabilize the regulated current.
ITERM
Battery test output
Driven high in the absence of a battery in order to provide a potential at the battery terminal when no battery is present.
Connects to an external R-C network to stabilize the regulated voltage.
ICOMP
Regulation timebase input
CSEL
Temperature sense input
Charge sense-select input (shared pin
with LED1)
Input that controls whether current is
sensed on low side of battery or high side of
battery. A current mirror is required for
high-side sense.
Used to monitor battery temperature. An external resistor-divider network sets the lower and
upper temperature thresholds. (See Figures 8
and 9 and Equations 3 and 4.)
2
bq2954
VCC
TM
Power-On
Reset
MTO
Timer
ITERM
TPWM
Oscillator
DSEL
CSEL
VSS
Charge
Control
State
Machine
Voltage
Reference
LED1
LED2
BTST
CHG
Display
Control
TS
VCOMP
LCOM
BAT
PWM
Regulator
SNS
ICOMP
MOD
BD2954.eps
Figure 1. Functional Block Diagram
Functional Description
Charge Qualification
The bq2954 functional operation is described in terms of
the following (Figure 1):
The bq2954 starts a charge cycle when power is applied
while a battery is present or when a battery is inserted.
Figure 2 shows the state diagram for the bq2954. The
bq2954 first checks that the battery temperature is
within the allowed, user-configurable range. If the temperature is out of range, the bq2954 remains in the
QUALIFICATION state (S01) and waits until the battery
temperature and voltage are within the allowed range.
■
Charge algorithm
■
Charge qualification
■
Charge status display
■
Configuring the display and termination
■
Voltage and current monitoring
■
Battery insertion and removal
■
Temperature monitoring
■
Maximum time--out
■
Charge regulation
■
Recharge after fast charge
If during any state of charge, a temperature excursion
occurs HOT, the bq2954 proceeds to the DONE state
(S04) and indicates this state on the LED outputs and
provides no current. If this occurs, the bq2954 remains
in the DONE state unless the following two conditions
are met:
■
Temperature falls within valid charge range
■
VBAT falls below the internal threshold,VRCHG
If these two conditions are met, a new charge cycle begins. During any state of charge, if a temperature excursion occurs COLD, the bq2954 terminates charge and
returns to the QUALIFICATION state (S01). Charge restarts if VBAT and temperature are in valid range.
Charge Algorithm
The bq2954 uses a two-phase fast-charge algorithm. In
phase 1, the bq2954 regulates constant current until the
voltage on the BAT pin, VBAT, rises to the internal
threshold, VREG. The bq2954 then transitions to phase 2
and regulates constant voltage (VBAT = VREG) until the
charging current falls below the programmed I MIN
threshold. Fast charge then terminates, and the bq2954
enters the Charge Complete state. (See Figure 2.)
When the temperature and voltage are valid, the bq2954
enters the CONDITIONING state (S02) and regulates
current to ICOND (=IMAX/10). After an initial holdoff period tHO (which prevents the IC from reacting to transient voltage spikes that may occur when charge current
is first applied), the IC begins monitoring VBAT. If VBAT
does not rise to at least VMIN before the expiration of
3
bq2954
Volt Fault: When VBAT > VHCO
Time Fault: When T = MTO/4 in State S02 or T = MTO in S03a
Hold Time: A VHCO Fault or State charge held off for 0.740s to 1.12s
VCC "Up"
Power-On
Reset
Mod = 0
No Action
Latch DSEL/CSEL Inputs
Battery Removal
VBAT < 0.8V Reset Faults
Latch DSEL/CSEL Inputs
Temp Not Valid
0.8V > VBAT > VHCO
Hold Time
Hold-off Faults
CHG = 0
Battst = 1
VBAT< VRCHG
QUALIFICATION
Fault
CHG = 0
S01
Temp Valid
VHCO < VBAT >0.8V
Reset MTO
CONDITIONING
Volt or
Time Fault
VBAT < VMIN: ISNS = IMAX/10
Hold Time
CHG = 1
S02
Time Fault
Temp Not Valid
T = MTO/25
VBAT >VMIN
Reset MTO
CURRENT
REGULATION
ISNS = IMAX: VBAT < VREG
T < MTO
Hold Time
CHG = 1
S03a
Volt or Time Fault
Temp Not Valid
VBAT > VHCO or T = MTO
VBAT = VREG
Full Charge
Indication
VOLTAGE
REGULATION
VBAT = VREG: IMAX > ISNS > ITRMN
T< MTO
CHG = 1
S03b
ISNS = IMIN
Volt Fault
Temp Not Valid
VBAT > VHCO
T = MTO
ISNS = ITRM
DONE
Temp Hot
VBAT > VRCHG
Hold-off MOD
VRCHG < VBAT < VHCO
CHG = 1
S04
Temp Not Hot andVBAT < VRCHG
Volt Fault
VBAT > VHCO
1s Hold Time after VBAT < VRCHG
VBAT Voltages:
VRCHG = 1.92V 0.5V
VMIN = 1.50V 0.5V
VREG = 2.05V
VHCO = 2.30V
Figure 2. bq2954 Charge Algorithm
4
FGbg295401.eps
bq2954
R2
D4
8-24VDC ±10%
VDC
R1
C10
47uF
25V
R4
10K
U2
ZMR500
G OUT
IN
N
D
C3
1uF
25V
L2
4.7K
Q1
FMMT3906
B130DI
D5
B130DI
1K
5V
R5
10K
C2
1uF
BAT+
47uH
Q5
FZT789A
Q2
FMMt3904
L1
10 uH
D1
1N4148
Q3
FMMT451
C11
10uF
20V
PCS4106
R14
RB1
5V
R15
RB2
R6
10K
R9
220
BATR10
62K
D2
GRREN
5V
R7
1K
U1
0.1 uF
R13
1K
C8
1000pF
C4
0.1 uF
C6
R8
0.25 5%
0.5W
16
15
14
13
12
11
10
9
D3
RED
R3
10K
C9
LED2/DSEL
LED1/CSEL
MOD
VCC
VSS
LCOM
BTST
TPWM
1
2
3
4
5
6
7
8
TM
CHG
BAT
VCOMP
ICOMP
ITERM
SNS
TS
R11
4.32K
1%
R12
8.45K
1%
TEM+
C7
bq2954
C5
470pF
0.1uF
Q4
FMMT3904
0.01uF
C1
0.1uF
2954sch9/23/98
1. IMAX = 1.0A, Vreg = 4.2V ± 1% PER CELL
2. MTO = 3 HRS, IFULL = IMAX/5, ITERM = IMAX/10
3. TEMP = 0-45˚C,
4. Frequency = 200kHz
Figure 3. High-Efficiency Li-Ion Charger for 1–4 Cells
5
bq2954
Table 1. Normal Fast Charge Cycle
VBAT
Battery
Absent
IBAT
Qualification
Fast Charge
Current
Regulate
VREG
Voltage
Regulate
Current
Taper
IFULL
Detect
Charge
Complete
IMAX
VMIN
ICOND
IFULL
IMIN
MTO
Time
Mode 1
(DSEL = 0)
Mode 2
(DSEL = 1)
Mode 3
(DSEL = F)
Mode 1
and 2
Mode 3
LED1
LED2
LED1
LED2
LED1
LED2
CHG
BTST
CHG
BTST
Low
Low
Low
Low
Low
Low
Low
High
Low
High
High
Low
High
Low
High
Low
High
Low
High
High
High
Low
High
Low
High
Low
High
Low
High
Low
High
Low
High
Low
High
High
High
Low
High
Low
Low
High
Low
High
Low
High
High
Low
High
Low
Low
High
Low
High
Low
High
Low
Low
Low
Low
GR295401.eps
time-out limit tQT (i.e., the battery has failed short), the
bq2954 enters the Fault state. Then tQT is set to 25% of
tMTO. If VMIN is achieved before expiration of the time
limit, the bq2954 begins fast charging.
Configuring the Display Mode, IFULL/IMIN,
and ISENSE
DSEL/LED2 and CSEL/LED1 are bi-directional pins
with two functions: as LED driver pins (output) and as
programming pins (input). The selection of pull-up,
pull-down, or no-resistor programs the display mode on
DSEL as shown in Tables 1 through 3. A pull-down or
no-resistor programs the current-sense mode on CSEL.
Once in the Fault state, the bq2954 waits until VCC is cycled or a new battery insertion is detected. It then starts a
new charge cycle and begins the qualification process again.
Charge Status Display
The bq2954 latches the programming data sensed on
the DSEL and CSEL input when VCC rises to a valid
level. The LEDs go blank for approximately 400ms (typical) while new programming data are latched.
Charge status is indicated by the LED driver outputs
LED1–LED2. Three display modes (Tables 1– 3) are available in the bq2954 and are selected by configuring pin
DSEL. Table 1 illustrates a normal fast charge cycle, Table 2 a recharge-after-fast-charge cycle, and Table 3 an abnormal condition.
When fast charge reaches a condition where the charging current drops below IFULL, the LED1 and LED2
outputs indicate a full-battery condition. Fast charge
terminates when the charging current drops below the
6
bq2954
Table 2. Recharge After Fast Charge Cycle
VBAT
Charge Complete
IBAT
Fast Charge
Current
Regulate
VREG
IMAX
VRECHG
Voltage
Regulate
Current
Taper
IFULL
Detect
Charge
Complete
Discharge
VMIN
ICOND
IFULL
IMIN
Time
Mode 1
(DSEL = 0)
Mode 2
(DSEL = 1)
Mode 3
(DSEL = F)
Mode 1
and 2
Mode 3
LED1
LED2
LED1
LED2
LED1
LED2
CHG
BTST
CHG
BTST
Low
High
Low
High
Low
High
Low
Low
Low
Low
High
Low
High
Low
High
Low
High
Low
High
Low
MTO
High
Low
High
Low
High
High
High
Low
High
Low
Low
High
Low
High
Low
High
Low
Low
Low
Low
Low
High
Low
High
Low
High
High
Low
High
Low
Grbq295402.eps
7
bq2954
Table 3. Abnormal Condition
VBAT
Battery
Absent
IBAT
Qualification
Abnormal
Battery
VREG
IMAX
VMIN
ICOND
IMIN
Time
Mode 1
(DSEL = 0)
Mode 2
(DSEL = 1)
Mode 3
(DSEL = F)
CHG
BTST
LED1
LED2
LED1
LED2
LED1
LED2
Low
Low
Low
Low
Low
Low
Low
High
tQT
High
Low
High
Low
High
Low
High
Low
Flash
Low
Low
Low
Low
Low
Low
Low
GR295403.eps
Table 4. IFULL and IMIN Thresholds
ITERM
IFULL
IMIN
0
IMAX/5
IMAX/10
1
IMAX/10
IMAX/15
Z
IMAX/15
IMAX/20
8
bq2954
Battery insertion is detected within 500ms. Transition
to the fast-charge phase, however, will not occur for time
tHO (approximately one second), even if voltage qualification VMIN is reached. This delay prevents a voltage
spike at the BAT input from causing premature entry
into the fast-charge phase. It also creates a delay in
detection of battery removal if the battery is removed
during this hold-off period.
minimum current threshold, IMIN. The IFULL and IMIN
thresholds are programmed using the ITERM input pin
(See Table 4.)
Figures 4 and 5 show the bq2954 configured for display
mode 2 and IFULL = IMAX/5 while IMIN = IMAX/10.
Voltage and Current Monitoring
Temperature Monitoring
In low-side current sensing, the bq2954 monitors the
battery pack voltage as a differential voltage between
BAT and pins. In high-side current sensing, the bq2954
monitors the battery pack voltage as a differential voltage between BAT and VSS pins. This voltage is derived
by scaling the battery voltage with a voltage divider.
(See Figures 6 and 7.) The resistance of the voltage divider must be high enough to minimize battery drain
but low enough to minimize noise susceptibility. RB1 +
RB2 is typically between 150kΩ and 1MΩ. The voltage-divider resistors are calculated from the following:
RB1 N ∗ VCELL
=
−1
RB2
VREG
Temperature is measured as a differential voltage between TS and BAT-. This voltage is typically generated
by a NTC (negative temperature coefficient) thermistor
and thermistor linearization network. The bq2954 compares this voltage to its internal threshold voltages to
determine if charging is allowed. These thresholds are
the following:
■
(1)
■
where
VCELL = Manufacturer-specified charging cell voltage
N = Number of cells in series
VREG = 2.05V
■
The current sense resistor, RSNS (see Figures 6 and 7),
determines the fast-charge current. The value of RSNS
is given by the following:
R SNS =
0.25V
I MAX
High-Temperature Cutoff Voltage: VTCO = 0.4 ∗ VCC
This voltage corresponds to the maximum temperature
(TCO) at which charging is allowed.
High-Temperature Fault Voltage: VHTF = 0.44 ∗ VCC
This voltage corresponds to the temperature (HTF) at
which charging resumes after exceeding TCO.
Low-Temperature Fault Voltage: VLTF = 0.6 ∗ VCC
This voltage corresponds to the minimum temperature
(LTF) at which charging is allowed.
Charging is inhibited if the temperature is outside the
LTF—TCO window. Once the temperature exceeds
TCO, it must drop below HTF before charging resumes.
(2)
RT1 and RT2 for the thermistor linearization network
are determined as follows:
where IMAX is the current during the constant-current
phase of the charge cycle. (See Table 1.)
0.6 ∗ VCC =
V
RT1 ∗ (RT2 + R LTF )
1+
(RT2 ∗ R LTF )
(3)
0.44 =
1
RT1 ∗ (RT2 + R HTF )
(RT2 ∗ R HTF )
(4)
Battery Insertion and Removal
VBAT is interpreted by the bq2954 to detect the presence
or absence of a battery. The bq2954 determines that a
battery is present when VBAT is between the
High-Voltage Cutoff (V HCO = V REG + 0.25V) and
the Low-Voltage Cutoff (VLCO = 0.8V). When VBAT is
outside this range, the bq2954 determines that no battery
is present and transitions to the battery test state, testing
for valid battery voltage. The bq2954 detects battery removal when VBAT falls below VLCO. The BTST pin is
driven high during battery test and can activate an external battery contact pull-up. This pull-up may be used to
activate an over-discharged Li-Ion battery pack. The VHCO
limit implicitly serves as an over-voltage charge fault. The
CHG output can be used to disconnect capacitors from the
regulation circuitry in order to quickly detect a battery-removed condition.
1+
where
RLTF = thermistor resistance at LTF
RHTF = thermistor resistance at HTF
V = VCC - 0.250 in low-side current sensing
V = VCC in high-side current sensing
TCO is determined by the values of RT1 and RT2. 1%
resistors are recommended.
9
bq2954
VCC
LED2/DSEL
LED1
VCC
10K
1K
16
LED2/DSEL
15
LED1
10K
1K
16
15
1K
1K
VCC
VSS
6
LCOM
13
VCC
12
VSS
6
11
LCOM
bq2954
13
12
10K
11
bq2954
VSS
VSS
Low-Side Sense Mode
High-Side Sense Mode
FGbq295402LS.eps
FGbq295402HS.eps
Figure 4. Configured Display Mode
(Low-Side Sense)
VCC
Figure 5. Configured Display Mode
(High-Side Sense)
BAT +
VCC
RB1
BAT
13
12
Current
Mirror
MOD
BAT
13
12
RB2
VSS
bq2954
BAT +
3
VCC
SNS
RSNS
Switching
Circuit
RB2
VSS
SNS
RSNS
bq2954
VSS
3
VCC
BAT -
7
RB1
BAT -
7
RB3
VSS
Low-Side Sense Mode
High-Side Sense Mode
FGbq295403HS.eps
FGbq295403LS.eps
Figure 6. Configuring the Battery Divider
(Low-Side Sense)
Figure 7. Configuring the Battery Divider
(High-Side Sense)
10
bq2954
VCC
VCC
RT1
bq2954
LPD1
13
12
bq2954
LPD1
RT2
VSS
SNS
TS
13
NTC
Thermistor
RT
t
VCC
12
BAT -
7
RT1
NTC
Thermistor
VCC
RT2
VSS
SNS 7
8
TS
8
RCSEL
BAT -
RSNS
VSS
VSS
Low-Side Sense Mode
High-Side Sense Mode
FGbq295404LS.eps
FGbq295404HS.eps
Figure 8. Low-Side Temperature Sensing
Figure 9. High-Side Temperature Sensing
Disabling Temperature Sensing
VCC
Temperature sensing can be disabled by placing a 10kΩ
resistor between TS and BAT- and a 10kΩ resistor between TS and VCC. See Figures 8 and 9.
R
1
TM
Maximum Time-Out
C
VCC
VSS
Maximum Time-Out period (tMTO) is programmed from
1 to 24 hours by an R-C network on the TM pin (see Figure 10) per the following equation:
13
12
tMTO = 500 ∗ R ∗ C
(5)
where R is in ohms, C is in Farads, and tMTO is in hours.
The recommended value for C is 0.1µF.
The MTO timer is reset at the beginning of fast charge.
If the MTO timer expires during the voltage regulation
phase, fast charging terminates and the bq2954 enters
the Charge Complete state. If the conditioning phase
continues for time equal to tQT (MTO/4) and the battery
potential does not reach VMIN, the bq2954 enters the
fault state and terminates charge. See Table 3. If the
MTO timer expires during the current-regulation phase
(VBAT never reaches VREG), fast charging is terminated,
and the bq2954 enters the fault state.
bq2954
VSS
FGbq295405.eps
Figure 10. R-C Network/Setting MTO
11
bq2954
Where C is in Farads and the frequency is in Hz. A
typical switching rate is 100kHz, implying CPWM =
0.001µF. MOD pulse width is modulated between 0 and
80% of the switching period.
Charge Regulation
The bq2954 controls charging through pulse-width
modulation of the MOD output pin, supporting both
constant-current and constant-voltage regulation.
Charge current is monitored at the SNS pin, and charge
voltage is monitored at the BAT pin. These voltages are
compared to an internal reference, and the MOD output
is modulated to maintain the desired value. The maximum duty cycle is 80% .
To prevent oscillation in the voltage and current control
loops, frequency compensation networks (C and R-C
respectively) are typically required on the VCOMP and
ICOMP pins .
Recharge After Fast Charge
Voltage at the SNS pin is determined by the value of resistor RSNS, so nominal regulated current is set by the
following equation:
IMAX =VSNS /RSNS
Once charge completion occurs, a fast charge is initiated
when the battery voltage falls below VRECHG threshold.
A delay of approximately one second passes before recharge begins so that adequate time is allowed to detect
battery removal. (See Table 1.)
(6)
The switching frequency of the MOD output is determined by an external capacitor (CPWM) between the pin
TPWM and VSS pins, per the following:
fPWM =
1 ∗ 10 −4
CPWM
(7)
12
bq2954
Absolute Maximum Ratings
Symbol
Parameter
Minimum
Maximum
Unit
Notes
VCC
VCC relative to VSS
-0.3
+7.0
V
VT
DC voltage applied on any pin excluding VCC relative to VSS
-0.3
+7.0
V
-20
+70
°C
Commercial
TOPR
Operating ambient temperature
-40
+85
°C
Industrial “N”
-55
+125
°C
-
+260
°C
TSTG
Storage temperature
TSOLDER
Soldering temperature
Note:
Permanent device damage may occur if Absolute Maximum Ratings are exceeded. Functional operation should be limited to the Recommended DC Operating Conditions detailed in this data sheet. Exposure to conditions beyond the operational limits for extended periods of time may affect device reliability.
DC Thresholds
Symbol
10s max.
(TA = TOPR; VCC = 5V ± 10%)
Rating
Unit
Tolerance
Internal reference voltage
2.05
V
1%
Temperature coefficient
-0.5
mV/°C
10%
VLTF
TS maximum threshold
0.6 * VCC
V
± 0.03V
Low-temperature fault
VHTF
TS hysteresis threshold
0.44 * VCC
V
± 0.03V
High-temperature fault
VTCO
TS minimum threshold
0.4 * VCC
V
± 0.03V
Temperature cutoff
VHCO
High cutoff voltage
VREG + 0.25V
V
± 0.03V
VMIN
Under-voltage threshold at BAT
1.5
V
± 0.05V
VRECHG
Recharge voltage threshold at BAT
1.92
V
± 0.05V
VLCO
Low cutoff voltage
0.8
V
± 0.03V
0.250
V
10%
IMAX
VSNS
Current sense at SNS
0.025
V
10%
ICOND
VREG
Parameter
13
Notes
TA = 25°C
bq2954
Recommended DC Operating Conditions (TA = TOPR)
Symbol
Parameter
VCC
Supply voltage
VTEMP
Minimum
Typical Maximum
Unit
Notes
4.5
5.0
5.5
V
TS voltage potential
0
-
VCC
V
VBAT
BAT voltage potential
0
-
VCC
V
ICC
Supply current
-
2
4
mA
Outputs unloaded
DSEL tri-state open detection
-2
-
2
µA
Note
VTS - VSNS
IIZ
ITERM tri-state open detection
2
µA
VIH
Logic input high
VCC - 0.3
-
-
V
DSEL, ITERM
VIL
Logic input low
-
-
VSS + 0.3
V
DSEL, CSEL, ITERM
LED1, LED2, BTST, output high
VCC - 0.8
-
-
V
IOH ≤ 10mA
MOD output high
VCC - 0.8
-
-
V
IOH ≤ 10mA
LED1, LED2, BTST, output low
-
-
VSS +0.8
V
IOL ≤ 10mA
MOD output low
-
-
VSS + 0.8
V
IOL ≤ 10mA
CHG output low
-
-
VSS + 0.8
V
IOL ≤ 5mA, Note 3
LCOM output low
-
-
VSS + 0.5
V
IOL ≤ 30mA
LED1, LED2, BTST, source
-10
-
-
mA
VOH =VCC - 0.5V
MOD source
-5.0
-
-
mA
VOH =VCC - 0.5V
LED1, LED2, BTST, sink
10
-
-
mA
VOL = VSS + 0.5V
MOD sink
5
-
-
mA
VOL = VSS + 0.8V
VOH
VOL
IOH
IOL
IIL
IIH
Notes:
-2
CHG sink
5
-
-
mA
VOL = VSS + 0.8V, Note 3
LCOM sink
30
-
-
mA
VOL = VSS + 0.5V
DSEL logic input low source
-
-
+30
µA
V = VSS to VSS + 0.3V, Note 2
ITERM logic input low source
-
-
+70
µA
V = VSS to VSS + 0.3V
DSEL logic input high source
-30
-
-
µA
V = VCC - 0.3V to VCC
ITERM logic input high source
-70
-
-
µA
V = VCC - 0.3V to VCC
1. All voltages relative to VSS.
2. Conditions during initialization after VCC applied.
3. SNS = 0V.
14
bq2954
Impedance (TA = TOPR; VCC = 5V ± 10%)
Symbol
Parameter
Minimum
Typical
Maximum
Unit
Notes
RBATZ
BAT pin input impedance
50
-
-
MΩ
RSNSZ
SNS pin input impedance
50
-
-
MΩ
RTSZ
TS pin input impedance
50
-
-
MΩ
RPROG1
Soft-programmed pull-up or pull-down
resistor value (for programming)
-
-
10
kΩ
DSEL, CSEL
RPROG2
Pull-up or pull-down resistor value
-
-
3
kΩ
ITERM
RMTO
Charge timer resistor
20
-
480
kΩ
Minimum
Typical
Maximum
Unit
Timing
(TA = TOPR; VCC = 5V ± 10%)
Symbol
Parameter
tMTO
Charge time-out range
1
-
24
hours
tQT
Pre-charge qual test time-out period
-
0.25 ∗ tMTO
-
-
tHO
Pre-charge qual test hold-off period
300
600
900
ms
fPWM
PWM regulator frequency range
-
100
200
kHz
dPWM
Duty cycle
0
-
80
%
Notes
See Figure 10
See Equation 7
Capacitance
Symbol
Parameter
Minimum
Typical
Maximum
Unit
CMTO
Charge timer capacitor
-
-
0.1
µF
CPWM
PWM capacitor
-
0.001
-
µF
15
bq2954
16-Pin DIP Narrow (PN)
16-Pin PN (0.300" DIP)
Inches
Millimeters
Dimension
Min.
Max.
Min.
Max.
A
0.160
0.180
4.06
4.57
A1
0.015
0.040
0.38
1.02
B
0.015
0.022
0.38
0.56
B1
0.055
0.065
1.40
1.65
C
0.008
0.013
0.20
0.33
D
0.740
0.770
18.80
19.56
E
0.300
0.325
7.62
8.26
E1
0.230
0.280
5.84
7.11
e
0.300
0.370
7.62
9.40
G
0.090
0.110
2.29
2.79
L
0.115
0.150
2.92
3.81
S
0.020
0.040
0.51
1.02
16-Pin SOIC Narrow (SN)
16-Pin SN (0.150" SOIC)
Inches
D
e
B
E
H
A
C
A1
.004
L
16
Millimeters
Dimension
Min.
Max.
Min.
Max.
A
0.060
0.070
1.52
1.78
A1
0.004
0.010
0.10
0.25
B
0.013
0.020
0.33
0.51
C
0.007
0.010
0.18
0.25
D
0.385
0.400
9.78
10.16
E
0.150
0.160
3.81
4.06
e
0.045
0.055
1.14
1.40
H
0.225
0.245
5.72
6.22
L
0.015
0.035
0.38
0.89
bq2954
Data Sheet Revision History
Change No.
Page No.
1
All
Note:
Description of Change
“Final” changes from “Preliminary” version
Change 1 = Oct. 1998 B changes from Nov. 1997 “Preliminary.”
Ordering Information
bq2954
Package Option:
PN = 16-pin plastic DIP
SN = 16-pin narrow SOIC
Device:
bq2954 Li-Ion Fast-Charge IC
17
IMPORTANT NOTICE
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any
product or service without notice, and advise customers to obtain the latest version of relevant information to verify,
before placing orders, that information being relied on is current and complete. All products are sold subject to the
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patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent TI deems
necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH,
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SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR WARRANTED TO BE SUITABLE FOR
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PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER’S RISK.
In order to minimize risks associated with the customer’s applications, adequate design and operating safeguards
must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that
any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor
products or services might be or are used. TI’s publication of information regarding any third party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.
Copyright © 1999, Texas Instruments Incorporated
18
PACKAGE OPTION ADDENDUM
www.ti.com
2-Jun-2013
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
Lead/Ball Finish
(2)
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
BQ2954PN
ACTIVE
PDIP
N
16
25
Pb-Free
(RoHS)
CU NIPDAU
N / A for Pkg Type
0 to 70
2954PN-A3
BQ2954PNE4
ACTIVE
PDIP
N
16
25
Pb-Free
(RoHS)
CU NIPDAU
N / A for Pkg Type
0 to 70
2954PN-A3
BQ2954SN
ACTIVE
SOIC
D
16
40
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
0 to 70
2954
-A3
BQ2954SNG4
ACTIVE
SOIC
D
16
40
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
0 to 70
2954
-A3
BQ2954SNTR
ACTIVE
SOIC
D
16
2500
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
0 to 70
2954
-A3
BQ2954SNTRG4
ACTIVE
SOIC
D
16
2500
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
0 to 70
2954
-A3
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4)
There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5)
Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
Addendum-Page 1
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
2-Jun-2013
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
26-Jan-2013
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
BQ2954SNTR
Package Package Pins
Type Drawing
SOIC
D
16
SPQ
Reel
Reel
A0
Diameter Width (mm)
(mm) W1 (mm)
2500
330.0
16.4
Pack Materials-Page 1
6.5
B0
(mm)
K0
(mm)
P1
(mm)
10.3
2.1
8.0
W
Pin1
(mm) Quadrant
16.0
Q1
PACKAGE MATERIALS INFORMATION
www.ti.com
26-Jan-2013
*All dimensions are nominal
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
BQ2954SNTR
SOIC
D
16
2500
367.0
367.0
38.0
Pack Materials-Page 2
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