PSC1534 AGERE | Alldatasheet
Document overview
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Technical content
Features
I Low external component count and small footprint I Charge termination indication and manual shut- down using PROG pin I Programmable charge current: 200 mA to 800 mA I 4.1 V or 4.2 V preset voltages I Automatic trickle charging at IPROG /10 for heavily discharged batteries requires no additional exter- nal components I Very low quiescent battery current during shut- down and standby (charger removed) I Charger undervoltage lockout and battery over- voltage lockout I Overcurrent/overtemperature protection I Low-profile (1 mm) SOT-23 package
Description
The PSC1534 is a constant-current/constant-voltage Li-Ion battery charger controller that is functionally equivalent and performance equivalent to the LTC ® 1734. As an enhancement, the PSC1534 also includes automatic detection and trickle charging of deeply discharged batteries (V BAT <2.42 V). The PSC1534 allows charge current programming using a single external resistor, RPROG . The voltage on the PROG pin is proportional to the charging cur- rent at the I SENSE pin, allowing the user to use an external A/D to monitor charging progress. A low bat- tery drain (BAT pin) manual shutdown state can be forced by floating the PROG pin. When the input sup- ply (V IN) is removed, the PSC1534 enters a very low- current sleep mode, during which BAT input supply current is <1 µA.
Applications
I Any application that requires a compact, low-cost solution for Li-Ion battery charging Typical Application Figure 1. 500 mA Li-Ion Battery Charger Figure 2. PROG Pin Indicates Charge Status
5 V VCC3
Figure 3. PSC1534 Block Diagram
3 VCC
1 ISENSE
5 BAT
2 GND
Figure 4. S6 Package, 6-Lead Plastic, 1 mm Thick, SOT-23 Table 1. Pin Descriptions current from VCC to the PNP emitter. ground to GND to minimize battery top-off voltage error. Bypass this pin to GND with a 1 µF to 10 µF tantalum capacitor. capacitor close to BAT and GND. will disable the driver if high-current fault conditions occur.
6 DRIVE
4 PROG
periods can adversely affect device reliability. Table 1. Absolute Maximum Ratings
- Absolute maximum ratings are those values beyond which the life of a device may be impaired.
† Some electrical characteristics are guaranteed by design and statistical process control.
Agere Systems Inc. 5 Preliminary Data Sheet April 2003 PSC1534 Lithium-Ion Linear Battery Charger
Electrical Characteristics
In Table 2, specifications are at TA = 25 °C. VCC = 5 V, GND = 0 V, and VBAT = VFLOAT unless otherwise noted. Bold text highlights the specifications that apply over the –40 °C to +85 °C operating temperature range. Table 2. Electrical Characteristics
- When operating near minimum VCC , a low Vce-sat PNP transistor is required.
‡ External PNP pass transistor has negligible Ib-e when the Vb-e = 4.2 V (VBAT – VCC = 4.2—0 = 4.2 V).
4.1 V version,
4.2 V version,
† When operating near minimum VCC , a low Vce-sat PNP transistor is required. § External PNP pass transistor has negligible Ib-e when the Vb-e = 4.2 V (VBAT – VCC = 4.2—0 = 4.2 V). Figure 5. Float Voltage vs. Temperature Figure 6. VFLOAT vs. IBAT (RPROG = 2 kΩ ) Table 2. Electrical Characteristics (continued)
Agere Systems Inc. reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application. Agere, Agere Systems, and the Agere logo are trademarks of Agere Systems Inc. Copyright © 2003 Agere Systems Inc. All Rights Reserved April 2003 DS02 -365MTD For additional information, contact your Agere Systems Account Manager or the following: INTERNET: http://www.agere.com E-MAIL: docmaster@agere.com N. AMERICA: Agere Systems Inc., Lehigh Valley Central Campus, Room 10A-301C, 1110 American Parkway NE, Allentown, PA 18109-9138 1-800-372-2447, FAX 610-712-4106 (In CANADA: 1-800-553-2448, FAX 610-712-4106) ASIA: Agere Systems Hong Kong Ltd., Suites 3201 & 3210-12, 32/F, Tower 2, The Gateway, Harbour City, Kowloon Tel. (852) 3129-2000, FAX (852) 3129-2020 CHINA: (86) 21-5047-1212 (Shanghai), (86) 755-25881122 (Shenzhen) JAPAN: (81) 3-5421-1600 (Tokyo), KOREA: (82) 2-767-1850 (Seoul), SINGAPORE: (65) 6778-8833, TAIWAN: (886) 2-2725-5858 (Taipei) EUROPE: Tel. (44) 7000 624624, FAX (44) 1344 488 045 Preliminary Data Sheet April 2003PSC1534 Lithium-Ion Linear Battery Charger Package Description All dimensions are in millimeters.
Ordering Information
LTC and LT are registered trademarks of Linear Technology Corporation. Table 3. Ordering Information