ltc4077 Linear Technology Corporation, ltc4077 Datasheet
ltc4077
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ltc4077 Summary of contents
Page 1
... The LTC4077 can be put into shutdown mode reducing the DCIN supply current to 20µA, the USBIN supply current to 10µA, and the battery drain current to less than 2µ ...
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... C to 125 C ORDER PART NUMBER LTC4077EDD Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: Consult LTC Marketing for parts specified with wider operating temperature ranges. ...
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... Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTC4077E is guaranteed to meet the performance specifications from 0°C to 85°C. Specifications over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls ...
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... LTC4077 TYPICAL PERFOR A CE CHARACTERISTICS W U Regulated Output (Float) Voltage vs Charge Current 4. DCIN USBIN 4.24 4.22 4.20 4.18 4. 1.25k IDC IDC IUSB 4.14 4.12 4.10 100 200 300 0 400 500 600 700 CHARGE CURRENT (mA) 4077 G01 IUSB Pin Voltage vs Temperature (Constant-Current Mode) 1.008 HPWR = 5V 1.006 1.004 1 ...
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... HPWR Pin Threshold (Rising) vs Temperature 900 DCIN USBIN 850 800 750 700 650 600 100 –50 – TEMPERATURE (°C) LTC4077 Charge Current vs Supply Voltage 900 THERMAL REGULATION 800 700 600 500 R = 1.25k IDC 400 BAT θ = 35°C/W JA 300 4.0 4.5 5 ...
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... LTC4077 TYPICAL PERFOR A CE CHARACTERISTICS W U USBIN Shutdown Current vs Temperature USBIN USBIN 4.3V USBIN –50 – TEMPERATURE (°C) 4077 G17 Undervoltage Lockout Threshold vs Temperature 4.30 4.25 DCIN UVLO 4.20 4.15 4.10 4.05 USBIN UVLO 4.00 3.95 3.90 –50 – TEMPERATURE (°C) ...
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... LED. C H R G (Pin 5): Open-Drain Charge Status Output. When the LTC4077 is charging, the C H R G pin is pulled low by an internal N-channel MOSFET. When the charge cycle is completed, C H R G becomes high impedance. This output is capable of sinking up to 10mA, making it suitable for driving an LED ...
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... LTC4077 BLOCK DIAGRA W DCIN 10 7 HPWR R HPWR 10mA MAX 4 PWR 10mA MAX CHRG 5 RECHARGE LOGIC RECHRG TRICKLE TERM TERMINATION 8 CC/CV REGULATOR + DC – 4.15V SOFT-START DCIN UVLO + – BAT + 4.1V – BAT DC_ENABLE – TRICKLE CHARGER CONTROL CHARGE 2. 100mV I /1000 I BAT BAT IDC – ...
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... Power Source Selection The LTC4077 can charge a battery from either the wall adapter input or the USB port input. The LTC4077 automati- cally senses the presence of voltage at each input. If both power sources are present, the LTC4077 defaults to the wall adapter source provided suffi ...
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... This minimizes the transient current load on the power supply during start-up and shut-off. *Any external sources that hold the pin above 100mV will prevent the LTC4077 from terminating a charge cycle. . USBIN ...
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... The charge status output ( C H R has two states: pull-down and high impedance. The pull-down state indicates that the LTC4077 charge cycle. Once the charge cycle has terminated or the LTC4077 is disabled, the pin state becomes high impedance. The pull-down state is capable of sinking up to 10mA ...
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... HPWR in its low state is: I CHRG USBL ( The LTC4077 can also program the wall adapter charge current and USB charge current independently using two program resistors, R charger circuit that sets the wall adapter charge current to 800mA and the USB charge current to 500mA (HPWR = high) or 50mA (HPWR = low) ...
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... BAT BAT W U Example: An LTC4077 operating from a 5V wall adapter (on the DCIN input) is programmed to supply 800mA full-scale current to a discharged Li-Ion battery with a voltage of 3.3V. Assuming θ the ambient temperature at which the LTC4077 will begin to reduce the charge current is approximately 105° ...
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... As an example, a correctly soldered LTC4077 can deliver over 800mA to a battery from a 5V supply at room temperature. Without a good backside thermal connection, this number would drop to much less than 500mA ...
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... U DD Package 10-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1699) 0.675 ±0.05 PIN 1 PACKAGE TOP MARK OUTLINE (SEE NOTE 6) 0.200 REF LTC4077 R = 0.115 0.38 ± 0.10 TYP 6 10 3.00 ±0.10 1.65 ± 0.10 (2 SIDES) (4 SIDES 0.25 ± ...
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... LTC4077 RELATED PARTS PART NUMBER DESCRIPTION LTC3455 Dual DC/DC Converter with USB Power Management and Li-Ion Battery Charger LTC4053 USB Compatible Monolithic Li-Ion Battery Charger LTC4054/LTC4054X Standalone Linear Li-Ion Battery Charger with Integrated Pass Transistor in ThinSOT LTC4055 USB Power Controller and Battery Charger ...