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ACT3704
Rev2, 26-Jul-07
12V Linear-Mode Battery Charger for Li+/Li-polymer Cells FEATURES
* * * * * * * * * * * *
Internal High Voltage MOSFET Up to 12V Input Voltage 0.5% Output Voltage Accuracy Charge Current Thermal Foldback Programmable Termination Voltage Programmable Fast Charge Current Programmable Charging Timer No Blocking Diode Required Low Reverse Leakage Preconditioning for Deeply Depleted Battery Low Quiescent Current Standby Mode Space-Saving, Thermally-Enhanced SOP8/EP, TDFN33-8
GENERAL DESCRIPTION
The ACT3704 is a complete linear charging solution for single cell Lithium Ion and Lithium Polymer batteries. It incorporates an internal 12V power MOSFET for Constant-Current, Constant-Voltage control (CC/CV). The battery regulation voltage accuracy is 0.5% and can be set to either 4.1V or 4.2V. The charge current is programmed with an external resistor to a maximum of 1A to minimize total charge time. The reverse leakage current from the battery is less than 1A if the input adaptor is disconnected or if there is a reverse battery connection. The ACT3704 is available in thermally-enhanced SOP-8/EP, and TDFN33-8 packages to accommodate high charge current operation and minimize total charging time.
APPLICATIONS
* * * * *
Mobile Phone Wireless Headsets Portable Media Players Cradle Chargers Portable Devices
TYPICAL APPLICATION CIRCUIT
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ACT3704
Rev2, 26-Jul-07
ORDERING INFORMATION
PART NUMBER
ACT3704YH ACT3704YH-T ACT3704NH-T
TEMPERATURE RANGE
-40C to 85C -40C to 85C -40C to 85C
PACKAGE
SOP-8/EP SOP-8/EP TDFN33-8
PINS
8 8 8
PACKING
TUBE TAPE & REEL TAPE & REEL
PIN CONFIGURATION
PIN DESCRIPTIONS
PIN NUMBER PIN NAME PIN DESCRIPTION
Open-Drain Charge Status Indicator. nEOC is a high voltage output and can withstand up to 12V, allowing it to drive LEDs that are directly connected to IN or to a lower voltage supply. nEOC features an internal 7mA current limit, allowing this pin to directly drive an LED for a visual charge-status indicator. For a logic-level charge status indicator, simply connect a 10k or greater pull-up resistor between nEOC and a suitable voltage supply. Charge Termination Voltage Adjust. Connect ADJ to G to select 4.10V termination voltage or connect ADJ to IN to select 4.20V termination voltage. Power Input. IN can be withstand operating voltages of up to 12V. Bypass to G with a 1F or larger capacitor. Charge Current Set. Program the maximum charge current by connecting a resistor (RISET) between ISET and G. See the Charge Current Programming section for more information. Safety Timer program pin. Connect to capacitor CTIMER. Charge Battery Output. Connect this pin to the positive terminal of the battery. Bypass this pin as close as possible to IC with 1F ceramic capacitor. Ground. Open-Drain Charge Status Indicator. nSTAT can withstand up to 12V, allowing it to drive LEDs that are directly connected to IN or to a lower voltage supply, nSTAT features an internal 7mA current limit, allowing this pin to directly drive an LED for a visual charge-status indicator. For a logic-level charge status indicator, simply connect a 10k or greater pullup resistor between nSTAT and a suitable voltage supply. Exposed Pad. The exposed thermal pad should be connected to board ground plane and G. The ground plane should include a large exposed copper pad under the package to connect the entire pad for thermal dissipation (see package outline).
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1
nEOC
2 3 4 5 6 7
ADJ IN ISET TIMER BAT G
8
nSTAT
EP
EP
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ACT3704
Rev2, 26-Jul-07
ABSOLUTE MAXIMUM RATINGS
PARAMETER
IN, ADJ, nSTAT, nEOC to G BAT to G ISET, TIMER to G ISET, TIMER Current Junction to Ambient Thermal Resistance (JA) Maximum Power Dissipation SOP-8/EP TDFN33-8 SOP-8/EP TDFN33-8
VALUE
-0.3 to 15 -0.3 to 7 -0.3 to 6 5 45 36.7 1.8 2 125 -65 to 150 300
UNIT
V V V mA C/W C/W W W C C C
Maximum Junction Temperature Storage Temperature Lead Temperature (Soldering, 10 sec)
: Do not exceed these limits to prevent damage to the device. Exposure to absolute maximum rating conditions for long periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = VTERM + 1V, VBAT = 3.6V, TA = 25C, unless otherwise specified.)
PARAMETER
Input Supply Voltage, VIN ADJ = G Battery Termination Voltage, VTERM ADJ = IN
CONDITIONS
MIN
4.2 4.079
TYP
4.1 4.2 0.03 0.05
MAX
12 4.121 4.141 4.221 4.242 0.1 0.1 2.95 1000
UNIT
V
TA = -40C to 85C TA = -40C to 85C
4.059 4.179 4.158
V
Line Regulation Load Regulation Precondition Threshold Precondition Threshold Hysteresis Constant Current Adjust Range Fast Charge Constant Current Precondition Charge Current End-of-Charge Threshold Charge Restart Threshold PMOS On Resistance UVLO Threshold UVLO Hysteresis BAT Reserve Leakage Current IN Supply Current IN Supply Current ADJ Voltage Threshold Thermal Regulation Threshold
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VIN = VTERM + 1V to 12V, IBAT = 10mA VIN = VTERM + 1V, IBAT = 10mA to 250mA 2.55 100 VBAT = 3.8V, RISET = 50k VBAT = 2.5V, RISET = 50k RISET = 50k VBAT Falling VBAT = 3.8V, IBAT = 100mA IN Rising IN Falling Input floating or charger disabled Charger Standby Charger Enable 3.8 0.45
%/V % V mV mA A mA mA V
2.75 125 0.51 51 51 VTERM - 0.1 0.7 4.0 1 0.4 500 0.7 1.7 120
0.57
1.2 4.2 4 800 2
V V A A mA V C
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ACT3704
Rev2, 26-Jul-07
ELECTRICAL CHARACTERISTICS CONT'D
(VIN = VTERM + 1V, VBAT = 3.6V, TA = 25C, unless otherwise specified.)
PARAMETER nSTAT, nEOC Outputs
Sink Current Output Low Voltage Leakage Current
CONDITIONS
VnSTAT = VnEOC = 2V ISINK = 1mA VnSTAT = VnEOC = 12V
MIN
4
TYP
7
MAX UNIT
10 0.4 1 mA V A
Charge Current Setting
ISET Pin Voltage IBAT to ISET Current Ratio 1.15 1.20 22 1.25 V kA/A
Charge Timers
TIMER Frequency POR Start Delay Transition Out of Preconditioning Delay Current Rise Time Out of Preconditioning Normal Safety Timer Precondition Safety Timer Total Safety Timer Time to End of Charge CTIMER = 2.2nF CTIMER = 2.2nF CTIMER = 2.2nF CTIMER = 2.2nF TIMER Floating 0.8 1.5 1 0.1 300 0.5 20 1 10 2.2 kHz ms ms s hr mins hr mins
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ACT3704
Rev2, 26-Jul-07
TYPICAL PERFORMANCE CHARACTERISTICS
(VIN = 5V, TA = 25C, unless otherwise specified.) Battery Termination Voltage vs. Charge Current
4.50 4.00 3.50 3.00 600 550 500 450 400
Charge Current vs. Battery Termination Voltage ACT3704-002
VIN = 5V RISET = 47k ADJ = G
ACT3704-001
VTERM (V)
IBAT (mA)
2.50 2.00 1.50 1.00 0.50 VIN = 5V RISET = 27k 0.00 ADJ = G 0 200 400 600 800 1000
350 300 250 200 150 100 50 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
IBAT (mA)
VBAT (V)
Charge Current vs. Supply Voltage
600 575 550 525 500 475
Charge Current vs. Battery Voltage ACT3704-003 ACT3704-004
Thermal Regulation Circuitry Active
500
IBAT (mA)
IBAT (mA)
400
450 425 400 375
300
200 VIN = 5V VBAT = 3.7V RISET = 47k 4.5 6.5 8.5 10.5 12.5 14.5
350 325 300 VIN = 5V RISET = 47k ADJ = G
100
275 3.00 3.10 3.20 3.30 3.40 3.50 3.60 3.70 3.80 3.90 4.00 4.10
VIN (V)
VBAT (V)
Charge Current vs. RISET
1000 900 800 700 4.300 4.275 4.250
Battery Termination Voltage vs. Supply Voltage ACT3704-005 ACT3704-006
500 400 300 200 100 0 0 VIN = 5V VBAT = 3.7V ADJ = G 50 100 150 200 250 300 350
VTERM (V)
IBAT (mA)
600
4.225 4.200 4.175 4.150 4.125 4.100 5.0 RISET = 47k IBAT = 100mA ADJ = IN 5.5 6.0 6.5 7.0 7.5 8.0 8.5
9.0
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ACT3704
Rev2, 26-Jul-07
TYPICAL PERFORMANCE CHARACTERISTICS CONT'D
(VIN = 5V, TA = 25C, unless otherwise specified.) Battery Termination Voltage vs. Temperature Battery Termination Voltage VTERM (V)
4.220
Battery Termination Voltage vs. Temperature Battery Termination Voltage VTERM (V)
4.120
ACT3704-007
ACT3704-008
4.210
4.110
4.200
4.100
4.190 VIN = 5V RVIN = 5V ISET = 47k ADJ G ADJ == IN -25 0 25 50 75 85
4.090 VIN = 5V ADJ = G -25 0 25 50 75 85
4.180 -50
4.080 -50
Temperature (C)
Temperature (C)
Charge Current vs. Ambient Temperature
550
Precondition Threshold Voltage vs. Ambient Temperature Precondition Threshold Voltage (V)
2.85 2.83 2.81 2.79 2.77 2.75 2.73 2.71 2.70 -40
ACT3704-009
ACT3704-010
530
IBAT (mA)
510
490
470
VIN = 5V RISET = 47k ADJ = VIN -40 -20 0 20 40 60 80
450
-20
0
20
40
60
80
Temperature (C)
Temperature (C)
Internal Charge Timer Frequency vs. Temperature
1.325 1.275 4.20
Undervoltage Lockout Voltage vs. Temperature ACT3704-0012
ACT3704-0011
Frequency (kHz)
1.225 1.175 1.125 1.075 1.025 1.000 -40 -15
VIN = 7V VIN = 5V
4.10
UVLO (V)
4.00
3.90
3.80 10 35 60 85 -40 -15 10 35 60 85
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ACT3704
Rev2, 26-Jul-07
FUNCTIONAL BLOCK DIAGRAM
IN
BODY
BAT
Q1 UVLO REG
REF
VREF = 1.20V
ADJ
ADJCTRL
+
BAT
CVAMP
+
1V
Thermal Foldback TJ > 120C
+ + -
CCAMP
EOCCOMP
CHARGE CONTROL
G
ISET TIMER nEOC OSCILLATOR
nSTAT
7mA 7mA
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ACT3704
Rev2, 26-Jul-07
FUNCTIONAL DESCRIPTION
The ACT3704 is an intelligent, stand-alone Constant-Current, Constant-Voltage control (CC/CV), linear-mode, single-cell charger for Lithium-Based cell chemistries. The device incorporates current and voltage sense circuitry, an internal 12V power MOSFET, a 120C thermal-regulation loop that minimizes total charge time, a complete state-machine that implements charge safety features, and circuitry that eliminates the reverse-blocking diode required by conventional charger designs. The ACT3704 features an accurate charge termination voltage, programmable fast-charge constant current, and a programmable charge safety timeout period. Other features include current-limited nSTAT and nEOC outputs that can directly drive LED indicators without external resistors or provide a logiclevel status signal to the host microprocessor.
Table 1: Charge Current Programming RISET(k)
89 64 56 47 33 27
Charge Current (mA)
297 413 470 562 800 989
CC/CV Regulation Loop
At the core of the ACT3704 is a CC/CV regulation loop, which regulates either current or voltage as necessary to ensure fast and safe charging of the battery. In a normal charge cycle, this loop regulates the current to the value set by RISET. Charging continues at this current until the battery voltage reaches the charge termination voltage. At this point the CV loop takes over, and charge current is allowed to decrease as necessary to maintain charging at the charge termination voltage.
The RISET values in Table 1 are standard 1%. Note that the actual charging current may be limited to a current that is lower than the programmed fastcharge current due to the ACT3704's internal thermal-regulation loop. See the Thermal Regulation Loop section for more information.
Thermal Regulation Loop
The ACT3704 features an internal thermal regulation loop that reduces the charging current as necessary to ensure that the die temperature does not rise beyond the thermal regulation threshold of 120C. This feature protects the ACT3704 against excessive junction temperature and makes the ACT3704 more accommodating to aggressive thermal designs. Note, however, that attention to good thermal designs is required to achieve the fastest possible charge time by maximizing charge current. In order to account for the extended total charge time resulting from operation in thermal regulation mode, the charge timeout periods are extended proportionally to the reduction in charge current. In order to ensure a safe charge, the maximum timeout periods are limited to 2x the room temperature values. The conditions that cause the ACT3704 to reduce charge current in accordance to the internal thermal regulation loop can be approximated by calculating the power dissipated in the part. Most of the power dissipation is generated from the internal charge MOSFET (Q1 in the Functional Block Diagram). The power dissipation is calculated to be approximately:
Setting The Charge Termination Voltage
The ACT3704 offers two pin-programmable battery termination voltages; connect ADJ to G to select a 4.10V termination voltage, connect ADJ to IN (or to a voltage greater than 1.4V) to select a 4.20V termination voltage.
Charge Current Programming
The maximum charging current is programmed by an external resistor (RISET) connected from ISET to G. Calculate RISET as follows:
RISET = 22k x (1.20V / IBAT )
Where IBAT is Amps.
(1)
PD = (VIN - VBAT ) x IBAT
(3)
The voltage at ISET is fixed at 1.20V, and the maximum charge current at BAT is set by:
IBAT = 22k x (1.20V / RISET )
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(2)
PD is the power dissipated, VIN is the input supply voltage, VBAT is the battery voltage and IBAT is the charge current. The approximate ambient tempera-8www.active-semi.com Copyright (c) 2007 Active-Semi, Inc.
ACT3704
Rev2, 26-Jul-07 ture at which the thermal regulation begins to protect the IC is given by :
T A = 120 C - PD x JA
T A = 120 C - (VIN - VBAT ) x I BAT x JA
1000mA to a battery from a 5V supply at 25C. Without a good backside thermal connection, this number could drop to less than 500mA.
(4)
State Machine
Precondition State A new charging cycle begins with the PRECONDITION state, and operation continues in this state until VBAT exceeds the Precondition Threshold Voltage of 2.8V. When operating in PRECONDITION state, the cell is charged at a reduced current given by: (8) Which is 10% of the programmed maximum fastcharge constant current, IBAT. Once VBAT reaches the Precondition Threshold Voltage the state machine jumps to the NORMAL state. If VBAT does not reach the Precondition Threshold Voltage before the Precondition Timeout period (TPRECONDITION) expires, then a damaged cell is detected and the state machine jumps to the TIMEOUT-FAULT State. The Precondition Timeout period is default to 20mins with an external 2.2nF CTIMER capacitor, or it can be increased with a larger value capacitor. See the Safely Timers section for more information. Normal State Normal state is made up of two operating modes, fast charge Constant-Current (CC) and ConstantVoltage (CV).
IPRECONDITION = 2.200 x (VISET / RISET )
Example: The ACT3704 is operating from a 5V wall adapter and is programmed to supply 700mA fast charge current to a discharged Li-Ion battery with a voltage of 3.4V. Assuming JA is 45C/W, the ambient temperature at which the device will begin to reduce the charge current is approximately:
T A = 120 C - (5V - 3.4V ) x (700 mA ) x 45 C
T A = 120 C - 1 . 12 W x 45 C = 120 C - 50 . 4 C
T A = 69 . 6 C
(5)
The ACT3704 can be used above 69.6C ambient, but the charge current will be reduced from 700mA. The approximate current at a given ambient temperature can be approximated by:
I BAT =
(120 C - T A ) (VIN - VBAT ) x JA
(6)
Using the previous example with an ambient temperature of 70C, the charge current will be reduced to approximately:
I BAT =
(120 C - 70 C ) (5V - 3.4V ) x 45 C / W
=
50 C 72 C / A
(7)
TA = 694 mA
ACT3704 applications do not need to be designed for worst-case thermal conditions, since the part will automatically reduce power dissipation if the thermal regulation threshold of approximately 120C is reached. However, in order to deliver maximum charge current under all conditions, it is critical that the exposed metal pad on the backside of the package exposed pad (EP) is soldered directly to the PC board ground. Correctly soldered to a double sided 1oz copper board, the ACT3704 has a thermal resistance of approximately 45C/W with SOP8 and 36.7C/W with TDFN33-8. Failure to make thermal contact between the exposed pad on the backside pf the package and the copper board will result in thermal resistances far greater than 45C/W with SOP8 and 36.7C/W with TDFN33-8. For example, a correctly soldered ACT3704 can deliver up to
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In CC mode, the ACT3704 charges at the current programmed by RISET (see the Charge Current Programming section for more information). During a normal charge cycle fast-charge continues in CC mode until VBAT reaches the charge termination voltage (VTERM), at which point the ACT3704 charges in CV mode. Charging continues in CV mode until the charge current drops to 10% of the programmed maximum charge current (IBAT), at which point the state machine jumps to the TOP-OFF state. If VBAT does not proceed out of the NORMAL state before the Normal Timeout period (TNORMAL) expires, then a damaged cell is detected and the state machine jumps to the TIMEOUT-FAULT State. The Normal Timeout period is default to 30mins, or it can be increased with an external 2.2nF CTIMER capacitor or can be changed with a larger value external capacitor. See the Safety Times section for more information.
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ACT3704
Rev2, 26-Jul-07 Top-Off State In the TOP-OFF state, the cell is charged in constant-voltage (CV) mode, with the charge current limited by the internal chemistry of the cell, decreasing as charging continues. If the ACT3704 state machine does not complete a charging cycle before the TOP-OFF Timeout period (TTOPOFF) expires, then a damaged cell is detected and the state machine jumps to the TIMEOUTFAULT State. The TOP-OFF Timeout period is default to 60mins with a 2.2nF CTIMER capacitor, or it can be increased with a larger value external capacitor. See the Safety Timers section for more information. In TOP-OFF state, nSTAT indicates charge complete but charge current still continues. After another delay of 60mins, then charging stops and charge current becomes zero. When the battery voltage drops below the charge restart voltage, the charging process will start again. End of Charge State In the End of Charge (EOC) state, the ACT3704 presents a high-impedance to the battery, allowing the cell to "relax" and minimize battery leakage current. The ACT3704 continues to monitor the cell voltage, however, so that it can reinitiate charging cycles as necessary to ensure that the cell remains fully charged. Charge Restart Under normal operation, the state machine initiates a new charging cycle by jumping to the NORMAL CHARGE state when VBAT drops below the Charge Termination Threshold by more than the Charge Restart Threshold of 100mV (typ). Timeout-Fault State In TIMEOUT-FAULT state, both nSTAT and nEOC indicators are OFF, or high-Z. For a logic-level indication, simply connect a resistor from each output to an appropriate voltage supply.
Reverse Battery & Shutdown
The ACT3704 includes internal circuitry that eliminates the need for series blocking diodes, reducing solution size and cost as well as dropout voltage relative to conventional battery chargers. When VIN goes below the ACT3704's under voltage-lockout (UVLO) voltage, or when VIN drops below VBAT, the ACT3704 automatically goes into SUSPEND mode and reconfigures its power switch to minimize current drain from the battery.
Safety Timers
The ACT3704 has several internal charge safety timers, for each of the PRECONDITION and NORMAL charge states as well as TOPOFF timeout period. If any of these timers expire before charge successfully proceeds through the associated state, the ACT3704 enters the TIMEOUT-FAULT state. The TIMEOUT-FAULT state can only be reset by powercycling the ACT3704. Each of these timers are internally set according to the following ratios: TPRECONDITION = 1 x TO (9)
TNORMAL = 1.5 x TO
TTOTAL = 3 x TO
(10) (11)
All the timers could be set by an external capacitor by (CTIMER in nF) where TO is given by: TO = 9 x CTIMER 15% (12) When operating in thermal regulation mode the timeout periods are extended in order to compensate for the effect of the reduced charging current on total charge time. In order to ensure a safe charge, the maximum timeout periods are limited to 2x the room temperature values.
Charge and EOC Status Outputs
nSTAT and nEOC are open-drain outputs that sink current when asserted and are high-Z otherwise. For more information regarding the state of nSTAT and nEOC throughout the entire charging cycle, see Table 3. These outputs have internal 7mA current limits, and are capable of directly driving LEDs, without the need of current-limiting resistors or other external circuitry, for a visual charge-status indication. To drive an LED, simply connect the LED between each pin and an appropriate supply (typically VIN).
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ACT3704
Rev2, 26-Jul-07 Table 2: Safety Timer Settings CTIMER (nF)
2.2 3.3 6 10 30
TPRECONDITION (minutes)
20 30 60 90 210
TNORMAL (minutes)
30 45 90 120 315
TTOTAL (minutes)
60 90 180 270 630
STATE DIAGRAM
ANY STATE VIN < 4.0V SUSPEND VIN > 4.0V
PRECONDITION Time > TPRECONDITION VBAT > 2.8V Time > TNORMAL VBAT < 2.7V
TIMEOUT-FAULT
NORMAL
VBAT = VREG Time > TTOTAL TOP OFF
VBAT < VREG
IBAT < 10% ICHRG and T > TEOC END OF CHARGE VBAT < VTERM - 0.1V
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ACT3704
Rev2, 26-Jul-07 Figure 1: Typical Li+ Charge Profile and ACT3704 Charge States
VTERM IBAT Current Voltage VPRECONDITION
4.20V 510mA
2.75V
IPRECONDITION, IEOC
51mA
TEOC
STATE
A
B
C
D
A: PRECONDITION State B: NORMAL State C: TOP-OFF State D: END OF CHARGE State
STATUS AND EOC INDICATORS
Table 3: nSTAT and nEOC Indicator States STATE
SHUTDOWN PRECONDITION NORMAL TOPOFF DELAY TIME TO EOC END OF CHARGE TIMEOUT FAULT
nSTAT
OFF ON ON ON OFF OFF OFF
nEOC
OFF OFF OFF OFF ON ON OFF
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ACT3704
Rev2, 26-Jul-07
APPLICATION INFORMATION
Figure 2: Application Circuit for 4.1V Battery, 470mA Charge
VIN
CIN 10F nEOC ADJ IN RISET 56k ISET G nSTAT BAT
ACT3704
TIMER
CTIMER = 10nF
CBAT 1F
Li+ or Li-POLYMER BATTERY
Figure 3: Application Circuit for 4.2V Battery, 800mA Charge
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ACT3704
Rev2, 26-Jul-07
PACKAGE OUTLINE
SOP-8/EP PACKAGE OUTLINE AND DIMENSIONS
DIMENSION IN MILLIMETERS MIN
D1
SYMBOL
A e
D
DIMENSION IN INCHES MIN
0.053 0.002 0.053 0.013 0.007 0.185 0.126 0.150 0.228 0.091
MAX
1.750 0.150 1.550 0.510 0.250 5.100 3.402 4.000 6.200 2.513
MAX
0.069 0.006 0.061 0.020 0.010 0.200 0.134 0.157 0.244 0.099
1.350 0.050 1.350 0.330 0.170 4.700 3.202 3.800 5.800 2.313
A1 A2 b c D D1 E E1 E2 e L
b
1.270 TYP 0.400 0 1.270 8
0.050 TYP 0.016 0 0.050 8
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ACT3704
Rev2, 26-Jul-07
PACKAGE OUTLINE
TDFN33-8 PACKAGE OUTLINE AND DIMENSIONS
SYMBOL
A A1 A3 D E D2 E2 b e L
DIMENSION IN MILLIMETERS MIN
0.700 0.000 0.153 2.900 2.900 2.200 1.400 0.200
DIMENSION IN INCHES MIN
0.028 0.000 0.006 0.114 0.114 0.087 0.055 0.008
MAX
0.800 0.050 0.253 3.100 3.100 2.400 1.600 0.320
MAX
0.031 0.002 0.010 0.122 0.122 0.094 0.063 0.013
0.650 TYP 0.375 0.575
0.026 TYP 0.015 0.023
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