View CM9100_638250.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

PRELIMINARY CM9100 Basic Compact Cost-effective Fast-Charger
Features
* * * * Monolithic linear charger requires no inductors, external sense resistors or blocking diodes. A few external components are required 4.75V to 6.5V operating input voltage range. Programmable the charging current to achieve the fastest charging rate without the risk of overloading the adapter Thermal limit control of charging current prevents overheating Maximum of 1A battery drain current Charging-current monitor output for system supervision of charging status TQFN-16, RoHS compliant lead-free package
Product Description
The CM9100 is an integrated linear-mode charger for single-cell, Lithium-ion batteries. It designed for compact and cost-sensitive handheld devices. It provides programming charge current, charge status indicator, high accuracy fast charge current and automatic charge voltage regulation. It requires no external blocking diodes or current sense resistors and needs only one external resistor to program the charging current. The CM9100 provides Precharge, Fast-charge (constant-current), and Termination (constant-voltage) charging modes. The Precharge/Termination currents are preset to 10/5% of the Fast-charge current level. A host system can monitor the actual charge current at the ISET pin. When the chip temperature reach 140C, the CM9100 goes into a latched shutdown mode stop charging until the chip temperature is below 140C will gradually charge and 105C resume fast charge. When the adapter is not present, the CM9100 draws less than 1A of drain current from the battery in ultra low power sleep mode. The CM9100 is packaged in a miniature 16-pin TQFN. It can operate over the ambient temperature range of -40C to 85C.
* * * *
Applications
* * * * Cellular phones and smart phones PDAs Portable Media Viewers Digital Still Camera Cradle Chargers
Typical Application
Vin VIN
4.7u 5k
1k VOUT
4.7u
GND ISET VSTB 1u
CM9100
STAT
Li-ion Battery
VREF 0.1u
(c) 2006 California Micro Devices Corp. All rights reserved. 06/30/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
1
PRELIMINARY CM9100
Package Pinout
PACKAGE / PINOUT DIAGRAM
TOP VIEW
(Pins Down View)
Pin 1 Marking
VSTB VIN NC NC
BOTTOM VIEW
(Pins Up View)
13
14
15
16
15
14
13
NC GND NC VREF
1
12 NC
12 11 10 9
16
1
CM910 000QE
2 3 4
11 VOUT 10 NC 9 STAT
GND PAD
2 3 4
8
7
6
ISET 5
NC 6
NC 7
CM9100-00QE 16-Lead TQFN Package (4mm x 4mm)
Note: This drawing is not to scale.
LEAD(s)
NAME
DESCRIPTION
1 2 3 4
NC GND NC VREF ISET
No connect. Ground pin. No connect. 4.2V, 2mA reference output pin. Pin to set the maximum charging current in the Fast charge (CC) mode. Also, reflects actual charging current. A resistor between this pin and ground sets the charge current, ICH:
RISET = 1000 x 2.5 V ----------------------------I CC
5
6 7 8 9 10 11 12 13 14
NC NC NC STAT NC VOUT NC VSTB NC
No connect. No connect. No connect. Charging status indicator pin (open-drain output). No connect. Charger output pin No connect. 4.2V output pin, connect a cap to ground to increase stability. No connect.
(c) 2006 California Micro Devices Corp. All rights reserved.
2
NC 8
PIN DESCRIPTIONS
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
l
5
Fax: 408.263.7846
l
www.cmd.com
06/30/06
PRELIMINARY CM9100
Pin Descriptions (cont'd)
PIN DESCRIPTIONS
15 16 NC VIN No connect. Positive input supply voltage pin, which powers the charger.
Ordering Information
PART NUMBERING INFORMATION
Lead Free Finish Pins 16 Package TQFN Ordering Part Number1 CM9100-00QE Part Marking CM910 000QE
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
Specifications
ABSOLUTE MAXIMUM RATINGS
PARAMETER ESD Protection (HBM) VIN to GND Pin Voltages VOUT, VREF, VSTB to GND ISET, STAT to GND Storage Temperature Range Operating Temperature Range (Ambient) Lead Temperature (Soldering, 10sec) RATING 2 [GND - 0.3] to +6.5 [GND - 0.3] to +6.5 [GND - 0.3] to +6.5 -65 to +150 -40 to +85 300 UNITS kV V
V V C C C
ELECTRICAL OPERATING CHARACTERISTICS (SEE NOTE 1)
SYMBOL VIN IQ PARAMETER VIN Supply Voltage Quiescent Current CONDITIONS VIN Charging modes, excluding current to ISET and STAT pins. All outputs are at no load. VIN = 0V (100 - resistor to ground), VBAT = 4.2V VOUT < 3.2V 0.85 x IPR MIN 4.75 TYP 2 MAX 6.5 UNITS V mA
VSHDN
Battery Drain Current
0.5
1
A
Charger Function IPR Precharge Mode Current
250 IPR = ----------------------R SET ( k ) 3.30
1.14 x IPR
mA
TCC
CC Mode Voltage Threshold
3.20
3.40
V
(c) 2006 California Micro Devices Corp. All rights reserved. 06/30/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
3
PRELIMINARY CM9100
Specifications (cont'd)
ELECTRICAL OPERATING CHARACTERISTICS (SEE NOTE 1)
SYMBOL ICC PARAMETER CONDITIONS CC Mode Charging Current VOUT > 3.5V MIN 0.92 x ICC TYP 2500 ICC = ----------------------RSET ( k ) 4.200 100 ITERM = ----------------------RSET ( k ) 4.100 105 140 1.0 120 4.200 4.200 MAX 1.08 x ICC 4.210 1.2 x ITERM 4.110 125 150 1.1 150 4.210 4.300 0.1 0.5 UNITS mA
VCC ITERM
CV Mode Voltage Threshold Charge Termination Current VOUT > 4.190V
4.190 0.8 x ITERM 4.090 (Note 2) (Note 3) (Note 4) ICC = 500mA IREF < 1mA 95 130 0.9 100 4.190 4.100 ISINK = 5mA ISINK = 20mA
V mA
VRCH
Recharge Mode Threshold Constant-temperature Mode, Limit Over-temperature Protection, Limit Over-Current Charging (OCP), Limit RDSON of Charger MOSFET Regulated Voltage VREF Regulated Voltage VSTB
V C C A m V V V V
OTP OCP
VREF VREF VSTB VSTB
Control Function STAT STAT (Open Drain) Output Low Voltage
Note 1: VIN = 5.0V. All outputs are on. TA = 25C unless otherwise specified. Note 2: When chip temperature reaches 105C, the IC's internal thermal limit will maintain this temperature by decreasing the programmed charge current Note 3: When chip temperature reaches 140C, the IC goes into a latched shutdown mode. It stops charging, stops supplying VOUT). To resume the charging function, a toggle of VIN is required. Note 4: When charging current reaches 1.2A, the IC goes into shutdown, latched mode only toggled VIN could resume the function.
(c) 2006 California Micro Devices Corp. All rights reserved.
4
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
06/30/06
PRELIMINARY CM9100
Typical Performance Curves
Charging Algorithm Battery Emulator, Cbattery = 30 mF RISET = 5 k
Ichg_cc=500mA CV mode = 4.2V
Battery voltage Battery voltage Charge current CC mode = 3.3V Charge current
Ichg_pr=50mA
Ichg_term=25mA
Time (2 ms/div)
Time (2 ms/div)
Battery Current Thresholds
Battery Voltage Thresholds
Functional Block Diagram
VIN
OCP
Current Limit
CM9100
VSTB VOUT
OTP
GND
Over-Temp Limit
Qc
VREF
LDO
Charger Control
STAT
ISET
(c) 2006 California Micro Devices Corp. All rights reserved. 06/30/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
5
PRELIMINARY CM9100
Flow Chart
4.75V < VIN < 6.5V Yes VIN < VOUT No
No
Yes
Iin > 1A Stop Charging Sleep mode Tj > 150 C
o
OCP Stop charging and Latch ; Set STAT=OFF OTP
Set Precharge Mode STAT=ON
Yes
VOUT < 4.200V-100 mV Standby Mode No
Precharge Mode VOUT > 3.3V CC Mode Yes Set Precharge Mode STAT=ON No
Stop charging Set STAT=OFF
Set CC mode STAT=ON
CV Mode No VOUT >= 4.200 V Yes Set CV Mode ICH < Iterm No Yes
Charge Done
(c) 2006 California Micro Devices Corp. All rights reserved.
6
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
06/30/06
PRELIMINARY CM9100
Application Information
The CM9100 is an integrated charger with a charging profile tailored for single-cell graphite electrode (anode) Li-ion batteries. With single resistor charge current programming, the CM9100 can provide charge currents up to 1000mA, or limited to 100mA/500mA for USB input applications. The charger features the three modes required for a safe and reliable Li-ion charging profile; Precharge, Fast-charge, and Termination charge. Extensive safety features include voltage and current monitoring. A status indicator provides charge state information.
From USB VIN
500 mA 100 mA
CM9100
VOUT
6.19k Q1 nmos
ISET
Charger
25.5k
Figure 1. USB Input Circuit
Linear Charger vs. Switching Charger
A Li-ion battery charger can be either a switching or a linear regulator. A switching regulator type charger achieves higher efficiency, typical 90% or better, over a wide range of load and line conditions and generally offers a faster charging speed. However, a switching charger requires an external power inductor, which occupies substantial PC board space with added weight. Another issue with switching regulators is the switching noise and the potential EMI it generates. In contrast, The CM9100 linear charger is implemented with a single IC, without the use of an inductor. The CM9100 provides a complete Li-ion charging control system, with integrated power MOSFETs and several important features, requiring just a few external resistors and capacitors for a compact system design. A sophisticated thermal management system addresses the concerns commonly associated with linear chargers.
Charging Li-ion Batteries
Once the CM9100 detects the presence of a valid AC adapter, and checks that the battery voltage at VOUT is less then VIN, it is ready to charge the Li-ion battery. If the battery voltage is deeply discharged (less than 3.2V), the CM9100 will start in the Precharge mode, charging at 10% of the programmed Fast-charge current level. See Figure 2. While the battery is charging, the status pins will be set to STAT=0. The Precharge current will gradually bring the battery voltage to above 3.2V.
PreCharge 0.8A
CC Mode
CV Mode Charging Voltage 4.0V
0.4A
Charging Current
3.0V
Input
When using a constant-voltage, 5VDC nominal, AC adapter, the semi-regulated voltage to the charger, after accounting for the conduction losses through the power cord and connector contacts, is a voltage in the range of 5.0V to 6.0V. The USB standard specifies a 5.0V +/-5% bus voltage, capable of 500mA (High Power peripheral configuration) of current. When using a USB input, the charging current must be limited to <500mA, which is set with the RSET resistor. In a system that requires 100mA starting current until told by the host controller to go into High Power mode, the circuit in Figure 1 can be used. Q1 can be the output of the controller.
(c) 2006 California Micro Devices Corp. All rights reserved. 06/30/06
2.0V
Figure 2. Typical Li-ion Battery Charging Process
Once the battery voltage exceeds the 3.3V threshold, the CM9100 enters the Fast-charge, constant-current (CC) mode. The status pins will be set to STAT=0. During the CC mode, the charging current is limited by the maximum charging current, programmed with a single resistor between ISET and ground, RISET:
2.5V x 1000 IFASTCHG ( max ) = ------------------------------R ISET
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
7
PRELIMINARY CM9100
Application Information (cont'd)
Most battery manufactures recommend an optimal charging current for their battery. This is typically a time ratio related to the battery capacity, with a value of .7C to 1C, once the battery is above the Precharge voltage level. For example, a 750mAh capacity battery with recommended charge of .7C could have ICC set for about 525mA, with RISET equal to 4.75k, 1%. The actual Fast-charge current might be further limited by either the maximum chip temperature limit, determined by the power dissipation on the CM9100 chip, the ambient temperature (TA), and the junction-toambient thermal resistance, Rth(JA). When the battery terminal voltage, sensed at VOUT, approaches 4.2V, the CM9100 enters the Termination (CV) mode. The charger then regulates its output voltage at 4.20V, and the charging current gradually decreases as the battery's internal voltage, VOC, rises toward 4.2V. The actual charging current is now determined by the differential voltage (4.20V - VOC) and the internal impedance, Rinternal, of the Li-ion battery-pack. The CM9100 ends the charging process when charging current drops below 5% of the Fast-charge (CC) mode current level. Once terminated, the charge current is completely stopped and no trickle charge is applied. Trickle (or float) charging is not required due to the minimal self-discharge of the Li-ion cells, and they are unable to absorb overcharge, which causes plating of metallic lithium and shortens the life of the battery. Following the Termination mode, the charger will enter the Standby mode. The status pin will be set to STAT=VIN. If the wall adapter is left plugged-in while in the Standby mode, the charger will continue to monitor the battery voltage. It automatically re-charges the battery when the battery voltage drops below the re-charge threshold. When the adapter is removed, the CM9100 will drain less than 1A from the battery. sis). This protects the charger IC and its nearby external components from excessive temperature. The Charger IC junction temperature is determined by several factors in the following equation:
TJ = TA + PD + Rth( JA ) (1)
The Rth(JA) is usually determined by the IC package and the thermal resistance between the package and the PC board. In particular, a SMD IC package relies on the underlying PC board copper to move the heat away from the junction. The key to reducing the thermal resistance between the IC package and the underlying PC board is using a large copper (Cu) area for solder attach and a large ground plane underneath the charger IC to conduct the heat away. The power dissipation (PD in equation 1) of a linear charger is the product of input-output voltage differential and output current.
PD = ( VIN - V OUT ) x I OUT
Highest power dissipation occurs when the battery at its lowest level (3.2V), when it just starts in the Fastcharge (CC) mode. Assuming VIN = 5.0V, VBAT = 3.2V, ICC = 1A, the PD = (5V-3.2V) x 1A = 1.8W. Assuming Rth(JA) = 50C/W, then -T = 1.8W x 50C/W = 90C. If the ambient temperature (TA) is 35C, then the junction temperature (TJ) could reach 125C without over-temperature current foldback. With over-temperature (OT) current foldback, the CM9100 will throttle down the charging current, allowing the junction temperature will reach steady-state equilibrium of 105C, which translates into 1.4W of power dissipation, or 0.78A of charge current. As the battery voltage rises during charging, the allowable PD dissipation is increased. When the battery voltage reaches 3.6V, a full 1.0A of charging current is allowed.
Charging Current Foldback in the Overtemperature Condition
A limitation of linear chargers is that they are vulnerable to over-temperature conditions. The CM9100 will throttle down the charging current when the chip junction temperature reaches 105C (with 10C of hystere-
OTP and OCP
In addition to chip temperature regulation at 105C, the CM9100 provides absolute over-temperature shutdown protection. In the case of a malfunctioning charger control, high ambient temperature or an unexpectedly high IC thermal resistance, Rth(JA) (for example, due to faulty soldering of the charger IC chip). The CM9100
(c) 2006 California Micro Devices Corp. All rights reserved.
8
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
06/30/06
PRELIMINARY CM9100
Application Information (cont'd)
provides an absolute OTP shutdown at junction temperature of 150C. drops below the re-charge threshold, a new charge cycle begins. Shutdown mode is triggered by a charging fault. These include, Input current that exceeds 2.4A (OCP), the IC junction temperature exceeds 150C (OTP). Charging stops. Sleep mode is entered when the Adapter is removed (or is the wrong voltage). Charging stops. In this mode, the CM9100 draws less than 1A of current from the battery.
Charging status
CM9100 provides a charging status indicator pin: STAT. This is an open-drain output, which can drive an LED directly, with up to 20mA of current sinking capability. Alternatively, the system supervisory microprocessor can monitor the battery charging status by interfacing with this pin, using a 100k pull-up resistor. See Table 1.
CHARGE STATUS Precharge in progress Fast-charge in progress Charge completed Charge suspended (OTP, OCP) STAT Low Low High High -
Component Selection
The constant voltage AC Adapter must be selected carefully to minimize power losses and heat dissipation in the charger. The input supply should be between 5.0V and 6.0V. The lowest allowable input voltage will minimize heat dissipation and simplify the thermal design.
Table 1: Charge Status for STAT
Charging Control by the Host System
The CM9100 allows a host-system to take active control of the charging process by providing actual charging current monitoring via the 1000:1 current mirror on RISET. This is especially useful for the system's direct control of the Termination threshold (preset to 5% of CC mode level).
Layout Considerations
Because the internal thermal foldback circuit will limit the current when the IC reaches 105C it is important to keep a good thermal interface between the IC and the PC board. It is critical that the exposed metal on the backside of the CM9100 be soldered to the PCB ground. The Cu pad should is large and thick enough to provided good thermal spreading. Thermal vias to other Cu layers provide improved thermal performance. VIN and VOUT are high current paths and the traces should be sized appropriately for the maximum current to avoid voltage drops.
Mode Summary
Precharge mode is the typical charge starting mode for pre-conditioning a deeply discharged battery (<3.3V). A constant current of 10% of the programmed Fast-charge current is applied to raise the voltage safely above 3.3V. Fast-charge mode is the constant current charging mode that applies most of the battery charge. A programmed constant current is applied to bring the battery voltage to 4.2V. Termination mode is the final charging mode, where a constant voltage of 4.2V is applied to the battery until the charge current drops below 5% or the programmed Fast-charge current. Standby mode is entered after a successful Termination mode and charging is done. Charging stops. In this mode, the battery is monitored, and when its voltage
(c) 2006 California Micro Devices Corp. All rights reserved. 06/30/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
9
PRELIMINARY CM9100
Typical Evaluation Circuit
VIN C1 4.7U
16 15 14 13
VIN
1
NC
NC VSTB NC VOUT NC STAT
12
Li-ion Battery +VBAT
C3 4.7U
NC GND NC VREF ISET
5
3
CM9100
THERMISTOR
2
11
10
THERM
R6 500
R7 10K
C2 0.1U
4
9
6
7
*
R5 5K
(c) 2006 California Micro Devices Corp. All rights reserved.
10 490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
8
R4 499
NC
NC
NC
D1 GLED
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
06/30/06
PRELIMINARY CM9100
Mechanical Details
TQFN-16 Mechanical Specifications The CM9100-00QE is supplied in a 16-lead, 4.0mm x 4.0mm TQFN package. Dimensions are presented below. For complete information on the TQFN16, see the California Micro Devices TQFN Package Information document. Mechanical Package Diagrams
D
PACKAGE DIMENSIONS
Package Leads Dim. A A1 A3 b D D1 D2 E E1 E2 e L # per tape and reel 0.45 2.00 2.00 3.90 0.25 3.90 Millimeters Min 0.07 0.00 0.20 REF 0.30 4.00 1.95 REF 2.10 4.00 1.95 REF 2.10 0.65 TYP. 0.55 0.65 0.018 3000 pieces
E2
TQFN-16 (4x4) 16 Inches Max 0.80 0.05 0.35 4.10 2.20 4.10 2.20 Min 0.28 0.00 .008 0.010 0.154 0.079 0.154 0.079 0.012 0.157 0.077 0.083 0.157 0.077 0.083 0.026 0.022 0.026 0.087
D1
E
Pin 1 Marking Nom 0.030 Max 0.031 0.002 0.014 0.161
0.08 C 0.10 C
Nom 0.75
0.15 C 0.15 C
TOP VIEW
0.087 0.161
SIDE VIEW
A3 A1
A
Controlling dimension: millimeters
E1
D2 L
DAP SIZE 1.8 X 1.8
e
b
16X 0.10
M
CAB
BOTTOM VIEW
Package Dimensions for 16-Lead TQFN
(c) 2006 California Micro Devices Corp. All rights reserved. 06/30/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
l
Tel: 408.263.3214
l
Fax: 408.263.7846
l
www.cmd.com
11

▲Up To Search▲

Price & Availability of CM9100

	To Download CM9100 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .