Document
www.DataSheet4U.com
POWER POWER MANAGEMENT MANAGEMENT Description Style Name _GreenBarText Description
SC805A Miniature Integrated High Current Lithium-Ion Battery Charger
Features Features
Fully integrated charger with FET pass transistor, Reverse-blocking diode, sense resistor and thermal protection High accuracy charge current* Tiny 3mm x 3mm 10-lead MLPD package Programmable pre-charge, fast-charge and termination current Battery voltage controlled to 1% accuracy Built-in timer for protection and complete charging NTC interface with battery detection Soft-start to reduce adapter in-rush current Up to 1A continuous charge current Input voltage range from 3V to 6V allows seamless charging from current limited adapter Applications Provides adapter voltage VCCIL to power external accessories Battery present detection and output indicator Operates in charger or LDO-Mode without battery 0.1µA battery drain current in shutdown and monitor modes Over-current protection in all charging modes CHRGB output communicates charging and end-of-charge cycle *US Patent 6,836,095
The SC805A is a fully integrated, single cell, constantcurrent (CC)/constant-voltage (CV) Lithium-Ion battery charger in a tiny 3x3 mm thermally enhanced lead-free MLP package. The SC805A can operate as a stand-alone charger or in conjunction with a Power Management Integrated Circuit (PMIC). The SC805A has a pre-charge function for trickle charging deeply discharged batteries. The fast-charge current is enabled automatically when the battery voltage reaches the required threshold. When the battery reaches the constant voltage or CV portion of the charge curve, the SC805A switches to CV regulation mode. In this mode the output current decays as the battery charges until the termination current is reached and the SC805A signals the charge cycle is complete. The SC805A can be configured to continue charging for a pre-determined time before turning off, or to turn off immediately upon termination. After turning off its output, the SC805A enters monitor mode. If the battery voltage drops by 100mV from the CV voltage a new charge cycle will begin. The timer function also protects against charging faulty batteries by turning off if the pre-charge time exceeds ¼ of the total programmed charge duration. The SC805A also provides battery detection, and a battery NTC thermistor interface to disable charging when the battery temperature exceeds safe-to-charge limits. The SC805A can also function as a general purpose current source or as a current source for charging nickel-cadmium (NiCd) and nickel-metal-hydride (NiMH) batteries.
Applications
Cellular Phones PDAs Handheld Meters Charging Stations USB Chargers Digital Cameras Programmable Current Source
Typical Application Circuit
SC805A CHARGER VIN
SC805A Typical Application Circuit
C1 1µF
D1 LED
R2 3.01k
1 VCC VOUT 2 VCCIL CHRGB 7 EN/NTC ITERM 8 NOBAT IPRGM 9 RTIME GND
3 10 5 4 6 R4 3.01k
Charge Complete Indicator
D2 LED R5 3.01k
D3 LED
BATTERY
C1 R6 1k R7 1k 2.2µF
Adapter Present Indicator
R1 3.01k
RT1 Thermistor
R3 39.2k
Charging Indicator
March 3, 2007
www.semtech.com
www.DataSheet4U.com
SC805A
POWER MANAGEMENT Absolute Maximum Rating
Exceeding the specifications below may result in permanent damage to the device or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied.
Parameter VCC, VCCIL, EN/NTC to GND VOUT, NOBAT, IPRGM, CHRGB, ITERM, RTIME to GND Power Dissipation MLP (Derate 20mW/ °C above 85°C) Thermal Impedance, Junction to Case Junction Temperature Operating Ambient Temperature Range Peak IR Reflow Temperature, Soldering 20s-40s Storage Temperature Range VOUT Short to GND IVCCIL +IVOUT Total Output Current
Symbol
Maximum -0.3 to 7.0 -0.3 to +6.0
Units V V W °C/W °C °C °C °C A A
PD θJA TJ TA TPKG TSTG
2 40(1) 150 -40 to +85 260 -65 to 150 Continuous
IOUT_TOT
1
Notes: (1) Calculated from package in still air, mounted to 3” to 4.5”, 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards.
Electrical Characteristics
Unless otherwise noted: VCC = 4.75V - 5.25V.
Parameter Input Voltage
Symbol
Condition Min
25°C Typ 5 Max
TA (-40°C to +85°C) Min 3.5 Max 5.9 1 1.55 1 4.16 44 44.5 4.24 54
Units V µA mA µA V
ICCDIS Operating Current ICCCHG IleakBAT VBAT IPREQ
Shutdown Mode, EN = 0 Charging Mode CHRGB, ITERM, IPRG = 0µA VCC = 0V Vbat load = 75mA
0.1 1.2 0.1 4.20 50
Battery Leakage Current Regulated Voltage Battery Pre-Charge Current Battery Termination Current
2007 Semtech Corp.
ITERM Resistor = 3.01k ITERMQ 50 53.6
mA
www.semtech.com
www.DataSheet4U.com
SC805A
POWER MANAGEMENT Electrical Characteristics (Cont.)
Parameter Battery Fast-Charge Current(1) Symbol Condition Min IFastQ1 IFastQ2 IPRGM = 15k IPRGM = 1.87k VBATTERY = 3.8V Dropout Voltage = 500mV Battery Fast-Charge Max Current Limit IProg .