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SY6982E Datasheet Preview

SY6982E Datasheet

Two-Cell Boost Li-Ion Battery Charger

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Application Notes: SY6982E
High Efficiency, 2A, Two-Cell Boost Li-Ion Battery Charger
General Description
SY6982E is a 3.6-5.5VIN, 2A two-cell synchronous
boost Li-Ion battery charger integrates 1MHz switching
frequency and full protection functions. The charge
current up to 2A can be programmed by using the
external resistor for different portable applications and
indicates the charger current information simultaneous.
It also has a programmable charge timeout for safety
battery charge operation and a programmable input
voltage threshold for adaptive input current limit.
SY6982E can disconnect output when there is output
short circuit or shutdown happens. It consists of 18V
rating FETs with extremely low ON resistance to
achieve high charge efficiency and simple peripheral
circuit design.
SY6982E along with small QFN3x3 footprint provides
small PCB area application.
Ordering Information
SY6982 (□□)
Temperature Code
Package Code
Optional Spec Code
Ordering Number
SY6982EQDC
Package type
QFN3x3-16
Note
Typical Applications
Features
Low Profile QFN3x3 Package
Integrated Synchronous Boost with 18V Rating
Low RDSON FETs for High Charge Efficiency
Trickle Current / Constant Current / Constant
Voltage Charge Mode
Programmable Input Voltage Threshold for
Adaptive Current Limit.
Maximum 2A Constant Charge Curre t
Charge Current Information Indication.
Programmable Charge Timeout
Programmable Constant Charge Current
Selectable Constant Voltage
±0.5% Battery Voltage Accuracy
Thermal Regulation Pr tection
External Shutdown Function
Input Voltage UVLO and OVP
Over Temp rature Protection
Output Sho t Circuit Protection
Charge St tus Indication
Normal Synchronous Boost Operation When
Battery Removed
Applications
Cellular Telephones, PDA, MP3 Players, MP4
Players
Digital Cameras
Bluetooth Applications
PSP Game Players, NDS Game Players
Notebook
Figure1. Schematic Diagram
AN_SY6982E_Rev.0.9D Silergy Corp. Confidential- Prepared for Customer Use Only 1




Silergy

SY6982E Datasheet Preview

SY6982E Datasheet

Two-Cell Boost Li-Ion Battery Charger

No Preview Available !

Pinout (top view)
AN_SY6982E
Name
STAT
SYSRT
TIM
NTC
CV
VSEN
EN
SGND
ICHG
BD
BST
BAT
LX
PGND
SVIN
(QFN3x3-16)
Top Mark: AWFxyz, (Device code: AWF, x=year code, y=week code, z= l t number code)
Pin Number
1
2
3
4
5
6
7
8
9
10, 13
11
12
14
15
16
Description
Charge status indication pin. It is open drain output pin and pull high to SVIN thru a LED
to indicate the charge in process. When the cha ge is done, LED is off.
System ON/OFF control pin. When VBAT is lower than 6V, SYSRT pin outputs low logic
to turn off the system operation; when VBAT is high than 6V, SYSRT pin outputs high
logic to turn on the system operation.
Charge time limit pin. Connect this pin with a capacitor to ground. Internal current source
charge the capacitor for TC mode and CC mode’s charge time limit. TC charge time limit
is about 1/9 of CC charge time.
Thermal protection pin. UTP hreshold is typical 75%VSVIN and OTP threshold is typical
30%VSVIN. Pull up to SVIN can disable charge logic and make the IC operate as normal
boost regulator. Pull down to ground can shutdown the IC.
Battery CV voltage selection pin. Program 2 different CV thresholds by setting different
voltage on the pin. The detailed information is shown in description section.
Voltage sense of SVIN. If the voltage drops to internal 1.195V reference voltage, the
SVIN will be clamped to setting value and input current will be limited.
Enable control pin. High logic for enable on, and low logic for enable off.
Signal ground pin.
Charge current program pin, pull down to GND with a Resistor RICHG. The mirror current
about 1/10000 of the blocking FET current will dump into the external RC network thru
ICHG pin and compared to the internal reverence 1V. So ICC=(1V/ RICHG)x10000,
ITC=(1V/ RICHG)x1000.
Connect to the Drain of internal Blocking FET. Bypass at least 4.7uF ceramic cap to
GND.
Boost-Strap pin. Supply Rectified FET’s gate driver. Decouple this pin to LX with 0.1uF
ceramic cap.
Battery positive pin.
Switch node pin. Connect to external inductor.
Power ground pin.
Analog power input pin. Connect a MLCC from this pin to ground to decouple high
harmonic noise. This pin has OVP and UVLO function to make the charger operate
within safe input voltage area.
AN_SY6982E_Rev.0.9D Silergy Corp. Confidential- Prepared for Customer Use Only
2


Part Number SY6982E
Description Two-Cell Boost Li-Ion Battery Charger
Maker Silergy
Total Page 12 Pages
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