Four segment indicator,
single-chip Power Bank dedicated IC
ECL1001
General Description
ECL1001 includes a programmable high efficiency BUCK charger, four LED battery indicator, a Torch LED driver, a high
efficiency Boost converter, and an overdischarge protector. It is suitable for single-cell lithium -ion / lithium polymer battery charge and discharge management, and can be widely used in power bank, handheld devices, PDA, smart phones and
so on. It integrates high efficiency synchronous BUCK battery charge management , the maximum charging current of up to 2A ; the integrated boost DC / DC can output the maximum discharge current reaches 1.5A , and intelligent judgments load insertion and removal, automatic boost and automatic shutdown; the integrated battery detection and 4 -segment display, both in the state of charge or discharge, can effectively indicate the current battery remaining power.
By a unique key , it can easily control the boost switch start and Torch On/off . Torch LED can output maximum 50mA of
current. ECL1001 also integrates a battery temperature detection, low battery voltage protection, output over current / over voltage / short circuit protection circuit to ensure that chip and system security.
Features
◆One Key Control
◆1.5A charge current
◆2A discharge current
◆50mA Torch application integration
◆Automatically start when the device is plugged into power bank(need other circuits)
◆Automatically shut down when device is full or be plugged out 16 seconds
◆4 segment battery indicator
◆Low standby power consumption
◆Automatic shut down when Battery voltage is lower than 3.1V
Applications
◆Single-chip Power Bank solution
◆Single-cell lithium-ion / lithium polymer battery charger
◆Fixed 5V Boost Coverter
Typical Application Circuit
Note: L1 is the lowest indicator, and L1 is the reference of L2~L4, it must connect to a LED.
Pin Assignment
SOP Pin Number | QFN Pin Number | Pin Name | Function Description |
1 | 17 | VOUT | Boost output port,5V |
2 | 19, 20 | LX | Boost inductor port |
3 | 18, 1 | GNDA | Analog ground |
4 | 2, 3 | SW | Inductive charger port |
5 | 4, 5 | VIN | Charger power input port |
6 | 6 | SENSE | Charger current detection port |
7 | 7 | BATT | Battery access terminal |
8 | 8 | NTC | Battery temperature detection port , an external NTC resistor |
9 | 9 | KEY | Key input port , built-in pull-up resistor |
10 | 10 | L1 | Battery indicator 1, output port , constant current 3mA |
11 | 11 | L2 | Battery indicator 2 , output ports , constant current 3mA |
12 | 12 | L3 | Battery indicator 3 , output ports , constant current 3mA |
13 | 13 | L4 | Battery indicator 4 , output ports , constant current 3mA |
14 | 14 | GNDD | Digital Ground |
15 | 15 | Torch | LED Torch output ports, 50mA max. |
16 | 16 | SHUTDOWN | Load path control port |
Ordering Information
ECL1001 XX X
Embossed Tape :
R：Standard Feed
S：Reverse Feed
Package Type：
M3：SOP16
Q2：QFN4x4
Note: Reverse Tape and other packages to be customized, please contact our sales department.
Marking Information
Part No | Package | Mark | Information |
ECL1001M3X | SOP16 |
| |
ECL1001Q2X | QFN4x4 |
Block Diagram
Absolute Maximum Ratings
Parameter | Symbol | Maximum Rating | Unit |
Input Voltage | VIN | -0.3-6.5 | V |
VBATT | VBAT | -0.3-6.5 | |
Output Voltage | VOUT | -0.3-6.5 | |
Other terminal voltage | VOTHERS | -0.3-6.5 | |
LX switch current | ILX | 5 | A |
SW switching current | ISW | ±2.5 | A |
Operating temperature range | TOP | -45-85 | ℃ |
Lead Soldering Temperature ( 10 seconds ) | TLEAD | 300 | |
Lead Soldering Temperature ( 10 seconds ) | VESD | 4000 | V |
Note: Absolute maximum ratings are under any conditions cannot exceed the rating. In case exceed this rating; the product could suffer physical damage
Electrical Characteristics
Test Condition: VBATT=3.6V，VOUT=5V，VIN=5V，RS=0.05Ω (Ta=25 ℃ Unless Otherwise Specified)
Parameter | Symbol | Conditions | Min | Type | Max | Unit |
Key end turn-on voltage | VKEY | VBATT=3.6V | - | - | 1.2 | V |
Key end of the pull-up resistor | RKEY |
|
| 500K |
| Ω |
NTC temperature shutdown voltage | VHOT |
| 1.57 | 1.67 | 1.77 | V |
NTC Low Voltage Shutdown | VCOLD |
| 3.23 | 3.33 | 3.43 | V |
Standby Current | ISTANDBY |
| - | - | 1 | uA |
BOOST DC-DC parameters | ||||||
Input Voltage | VBATT | IOUT=1A | 3.2 | - | 5 | V |
Output Voltage | VOUT | IOUT=1A | 4.9 | 5.0 | 5.1 | |
Shutdown Current | IOFF |
| - | 0.01 | 1 | µA |
No Load Current | IC | VBATT=3.6V，VOUT=5V | - | 200 | - | μA |
Switching frequency | FS | IOUT=2A | 1.25 | 1.5 | 1.75 | MHz |
Switching frequency | DMAX | VBATT=3.6V | 75 | - | - | % |
Power tube resistance | R | VBATT=3.6V，ISW=2A | - | 65 | 100 | mΩ |
Power tube resistance | ILX | VBATT=4.2V | 3.5 | 4.5 | 5 | A |
Linear adjustment degree | ΔVLINE | IOUT=1A，VBATT=3.2V to 4.5V | - | 0.2 | - | % |
Load Regulation degrees | ΔVLOAD | VBATT=3.6V，IOUT=10mA to2A | - | 0.22 | - | % |
Load Regulation degrees | TSHD | VBATT=3.6V，IOUT=100mA | 143 | 153 | 163 | ℃ |
Thermal Shutdown Hysteresis | Δ TSHD | VBATT=3.6V，IOUT=100mA | 20 | 25 | 30 | ℃ |
Parameter | Symbol | Conditions | Min | Type | Max | Unit |
Automatic Shutdown Determine Current | ISHUTDOWN | VBAT=4.0V | - | 20 | - | mA |
Automatic Shutdown waiting time | TSHUTDOWN | IOUT=0mA | - | 16 | - | S |
Charger Electrical Parameters | ||||||
Input Voltage | VIN |
| 4.35 | 5 | 6 | V |
Input Current | IQ | Standby Mode VIN<4.35V | 50 | 60 | 70 | µA |
ISTB | End of Charge | 0.83 | 0.92 | 1.2 | mA | |
Battery terminal current | IR | reverse leakage current, VBATT>VIN | 0 | 0.01 | 0.1 | µA |
IOFF | Remove VIN | - | - | 0.1 | uA | |
IB | Standby Mode( End of charge ) | 150 | 200 | 250 | µA | |
Sensed pressure | VSENSE | 3V<VBATT<4.18V | 90 | 100 | 110 | mV |
Constant current charging current | ICHARGE | VBATT<4.18V | - | VSENSE/RS | - | A |
Charging up cut-off current | IEND | VBATT>4.2V | 50 | 65 | 80 | mA |
Trickle Charge limit voltage | VTR | VBATT Rising | 2.8 | 2.92 | 3 | V |
Hysteresis voltage trickle charging | Δ VTR |
| 60 | 80 | 110 | mV |
Output control voltage | VFLOAT | 0℃<TA<85℃, IBAT = 40mA | 4.158 | 4.2 | 4.242 | V |
Recharge the battery voltage | VRECHARGE | VBATT falling | - | 4.07 | - | V |
Hysteresis voltage battery recharge | Δ VREG | VBATT - VRECHARGE | 90 | 130 | 170 | mV |
Oscillator Frequency | FOSC | RL=100mA | 1.35 | 1.5 | 1.65 | MHz |
Low-voltage lockout power | VUVLO | VIN adjusted from low to high | 4.3 | 4.35 | 4.45 | V |
Supply high voltage lockout | VINOVP | VIN adjusted from low to high | 6.4 | 6.5 | 6.6 | V |
Battery high voltage lockout | VBOVP | Low battery voltage from VIN to adjust | 4.32 | 4.37 | 4.42 | V |
LED Electrical parameters | ||||||
Current battery indicator | ILED | VBAT=3.4V~4.2V | 2.5 | 3 | 3.5 | mA |
Current matching | Δ IMATCH | VBAT=3.6V | - | 5 | - | % |
Torch LED current | Itorch | VBAT=3.2V-4.2V | - | - | 50 | mA |
Operational Principle
ECL1001 is an single-chip power bank solution, that integrated DC / DC charge management, DC / DC
step-up, voltage sensing and power display. It complete the function integrated three or more of the original chip to
the single chip. Performance, you can set the maximum charge current 2A, maximum output current of the boost
can be achieved 1.5A, and shut down power consumption is almost zero ( less than 1uA).
Button Operation
It is the one-touch control. In the off state, a short click Key (short press times greater than 60mS less than 2S), cause power on, display the power, and turn on the boost. After 4 seconds, shut down the power display, and
L1 starts flashing (0.5Hz). L1 will always flashing when it is boosting. During the time, another short press Key, it
can show the power 4 seconds once again, and the booster is not being affected. The boost will automatically turns off, L1 blinking will stops and the device will enters the shutdown state, when the device is fully charged or the load is removed after 16 seconds. When the battery voltage is lower than 3.5V, with a short press Key, L1 will flash explosion 4S to alert the low battery. In the boost process, when the battery voltage is lower than 3.1V, the output will be automatically shut down to protect the battery not be over-discharged. Long press Key (pressing time is greater than 2S), will open the Torch function, and long press Key again to turn off the Torch. When the battery voltage is lower than 3.1V, you cannot open the Torch and output. But when the Torch has been turned on, it will not turn off when the battery voltage is too low. During charging, short press operation is masked, but long press can turn on or turn off the Torch.
Operating Mode | Function | short press Key (60ms<Key<2S) | Long press Key (Key>2S) |
Charging mode | Boost | / | / |
Power display | / | / | |
Torch | / | On or Off | |
Boost Mode | Boost | On | / |
Power display | Show 4S | / | |
Torch | / | On or Off |
Power Display
When the ECL1001 is during the boost or charging in, the voltage on the BATT monitored and calculated by
L1-L4 shows the current consumption, and each LED represents 25% of the power. Battery charge and
discharge curves, as shown
Charging, the battery indicator table below
Battery voltage | Indicator Number | Graphic（L1L2L3L4） |
<3.72 | L1 flashing | ▲□□□ |
3.72-3.87 | L2 flashing | ■▲□□ |
3.87-4.02 | L3 flashing | ■■▲□ |
>4.02 | L4 flashing | ■■■▲ |
End of Charge | All light | ■■■■ |
(■Represents a long bright, □Represents LED OFF, ▲Represents Charging Flashing, Frequence:1HZ, Pulse Width: 0.5S)
Bosting, the battery indicator table below (Short press display , four seconds and then turns off)
Battery voltage | Indicator Number | Graphic（L1L2L3L4） |
>3.85 | 4 | ■■■■ |
3.85-3.71 | 3 | ■■■□ |
3.71-3.55 | 2 | ■■□□ |
3.55-3.43 | 1 | ■□□□ |
3.43-3.2 | Flashing warning | ◆□□□ |
<3.2 | shut down | □□□□ |
(■Represents a long bright, □Represents LED OFF,◆Represent Low pressure alarm flashes, Frequence: 4HZ)
These voltage parameters for reference only , the actual difference because the battery and different production batches have voltage differences.
The power display will last 4 seconds, then L1 change to flashing , flashing period 2S, pulse width 0.25S, other
LED goes off.
charging modes
Built-in constant current constant voltage battery charging management, through a current -mode PWM control DC-DC topology to achieve, the charging current is set by an external connection on both ends of the VBATT and SENSE resistor to set the chip internally by a high accuracy reference to set the charging voltage.
When the input voltage is below the UVLO level (4.35V), the chip enters SLEEP MODE, then the chip power consumption to 60μA or less. When the input voltage rises above the UVLO voltage, the charger enters charging mode, then L1-L4 shows charging blinking. If the battery voltage is lower than the trickle charge threshold voltage (2.9V), the charger enters trickle charge mode, and the trickle charge set to 25 % of the maximum charge current. When the battery voltage exceeds the trickle charge threshold, the charger
enters constant current charging mode, then the charging current by the internal 100mV reference and
external sense resistor to decide, calculated as follows: ICHARGE=100mV/RS. When the battery voltage is close to the target value 4.2V, the charge current of the chip begins to drop and the chip enters constant voltage charging mode LDO. When the current drops to 65mA, the chip stops charging, L1-L4 full brightness. When the battery not leave BATT terminal and the battery voltage drops to 4.07V, the chip will automatically enter RECHARGE state, and restart the charge cycle. Once in charging mode, the boost circuit will automatically stop when the short press operation is masked, but the long press can turn on or turn off the light. Exit charge mode after entering standby mode.
Boost mode
In shutdown mode, short press Key or detect access to the load, then the boost circuit starts operating. In boost circuit, it can achieve efficient and stable work in a wide load range, using PWM current mode and voltage mode PFM automatic switching. Building a 4.5A power switch, lithium battery can deliver up to 2A of output current, and efficiency of 90% (up 95%). The SHUTDOWN pin with an external NMOS transistors, is to achieve the power path completely shutdown. When the chip is normal working, SHUTDOWN is high, and VOUT- used as a
load. Work in the chip off or an abnormal state (such as the short-circuit protection, etc.), SHUTDOWN client will drop as low to achieve the power path completely shutdown. SHUTDOWN end remain unconnected when it is not in use, and prohibit connecting to VBATT or GND terminal. The external NMOS transistor with the use of SHUTDOWN function, need very little resistance RDSON, in order to ensure high efficiency and ideal load short-circuit protection. Boost working, if detected the VIN voltage greater than 1.6V, it is considered to enter charge mode, SHUTDOWN immediately pulled low, and the output path closed. When the VIN is removed, it need to re-boost button before resuming work. Boost after the start, if it detects the output load current is very small ( less than 20mA),keeping this state for more than 16S, chips that are unloaded automatically enter standby mode, where the static power consumption is almost zero.
Temperature protection
ECL1001 built-in temperature compensation circuit, when the internal temperature reaches 100 ℃, the
maximum charging current or the maximum output current will fall with increasing temperature, reducing the
possibility of thermal breakdown of the chip, improving the reliability of the system on a chip. When the
temperature rises to 150 ℃, the chip enters the temperature protection, cutting output or stopping charging.
The chip also comes with battery temperature detection function, and this function through the NTC side to
achieve. The VBATT connect to divider resistors RT1 and RT2, and the NTC is terminated with a negative
temperature coefficient thermistor of 10KΩ RNTC (MF103F338F), RT1 and RT2 according to battery
temperature monitoring range and thermistor resistance values to determine. This pin can be directly connected to GND, to shield the temperature detection function.
Application Specification
Number | Part Number | Model ( reference value ) | Quantity |
1 | U1 | ECL1001 | 1 |
2 | S1 | SK34 | 1 |
3 | LB，LC | 3.3uH | 2 |
4 | RS | According to the charging current custom,0.05Ω | 1 |
5 | RT1 | According to the temperature range from the set, 2.54K | 1 |
6 | RT2 | According to the temperature range of custom, 5.32K | 1 |
7 | C1 | 22uF | 1 |
8 | C2 | 22uF | 1 |
9 | C3 | 100uF | 1 |
10 | N1 | MOSFET N, LN2312 | 1 |
11 | D5 | 50mA Bright LED | 1 |
12 | D1~D4 | LED lights ( red / blue / green ) | 1 |
13 | RL1 | Limiting resistor, 75Ω | 1 |
14 | RL2 | Limiting resistor , 47Ω | 1 |
15 | BUTTON1 | BUTTON ，K1 | 1 |
16 | C4 | 1uF | 1 |
Choice of Components
1. The selection of booster circuit output capacitor C3. The selection Output Capacitor depends on the output voltage ripple. In most cases, you want to use low ESR capacitors, such as ceramics and polymers
electrolytic capacitors. If you use a high- ESR capacitor,c you need to carefully review the converter
frequency compensation, and in the output circuit terminal may need to add an additional capacitor.
2. Choose textures and values of inductor LB and LC. Because the inductor value affects the input and output ripple voltage and current, so the inductor selection is the key of inductive voltage converter design. Low equivalent series resistance of the inductor, the power conversion efficiency is the best. Choose the
inductor saturation current rating, make it greater than the steady-state circuit inductor current peak.
3. Boost converter to choose fast forward voltage drop of the schottky rectifier diodes, so make it low power consumption and high efficiency. The average current of schottky diode rating should be greater than the maximum output current of the circuit.
4. Try to use a small internal resistance, fast switching speed of the MOSFET N, so make it low power
consumption and high efficiency, and be ready to heat treatment. LN2312 for the N-channel enhancement
type field effect transistor, RDSON = 27mohm @ VGS = 3.6V, can meet the conditions of use.
MOSFET N try to use a small internal resistance, fast switching speed, low power consumption and high
efficiency make it, and be ready to heat treatment. LN2312 for the N-channel enhancement type field effect
transistor, RDSON = 27mohm @ VGS = 3.6V, can meet the conditions of use.
5、Temperature protection divider resistor selection RT1/RT2 The VBATT connects the dividing resistors RT1 and RT2, and the NTC connects a negative temperature coefficient thermistor 10KΩ RNTC (MF103F338F), RT1 and RT2 according to battery temperature monitoring range and thermistor resistance values to determine
Suppose the set battery temperature range TL ~ TH, (TL <TH); negative temperature coefficient
thermistor (NTC). RTL is the resistance at temperature TL, and RTH is the resistance at temperature TH,
RTL> RTH.
At the temperature TL , NTC V_TL the voltage is:
At the temperature TH , NTC voltage V_TH is:
Similarly, if the battery using the positive temperature coefficient (PTC) thermistors, then RTH> RTL, in the formula of RT1 and RT2, the RTL and RTH can be reversed.
Derived from the above it can be seen that the subjecting set temperature range has nothing to do with supply voltage VIN. It is to do with RT1, RT2, RTL, and RTH; including RTL, RTH battery can access the relevant manuals or obtained through experimental tests. In practical application, if only one side of the temperature characteristics of concern, such as thermal protection, it cannot RT2, RT1 can use only. Calculating R1 becomes very simple, and do not repeat them here.
For example: Select the NTC resistor 10K, RT1=2.54K, RT2=5.32K. -20 to 60 degrees to achieve a
temperature range of detection.
PCB Layout Notes
1、Sampling resistance RS, and the filter capacitor C1, C2 as close IC.
2、High-current paths must be thick and wide wiring, and cabling area as small as possible .
3、Distinguish GNDA and GNDD alignment , grounding must be good.
4、High-frequency switching path is not through-hole, not the bottom cloth signal line inductance.
5、Ground area is large enough, and the board should shop copper to control IC heat well.
Package Information
SOP16
QFN4x4
