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1.1-A, Single-Input, Single-Cell, Li-Ion Battery Charger
With 50-mA LDO and 2.3-A Production Test Support
This user's guide describes the bq25040 evaluation module (EVM), how to setup the EVM to perform a
stand-alone evaluation or interface with a system or host. The charger is designed to deliver up to 1.1 A of
continuous current to the battery output in the adapter mode, ISET, or current limits the input to either 100
mA or 500 mA when in USB100/500 modes. The charge is programmed from the factory for 0.51 A in
ISET mode. In the Protection Test Support (PTS) mode, the battery output is capable of delivering > 2.3 A
of current for short pulses. The LDO regulator output can deliver up to 50 mA of current.
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SLUU358 - April 2009
1.1-A, Single-Input, Single-Cell, Li-Ion Battery Charger With 50-mA LDO and 2.3-A Production Test Support
Submit Documentation Feedback
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User's Guide
SLUU358 - April 2009
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Summary of Contents for Texas Instruments bq25040
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Page 1: Table Of Contents
With 50-mA LDO and 2.3-A Production Test Support This user's guide describes the bq25040 evaluation module (EVM), how to setup the EVM to perform a stand-alone evaluation or interface with a system or host. The charger is designed to deliver up to 1.1 A of continuous current to the battery output in the adapter mode, ISET, or current limits the input to either 100 mA or 500 mA when in USB100/500 modes. -
Page 2: Introduction
It operates from either a USB port or ac adapter and charges a single-cell, Li-Ion battery with up to 1.1 A of charge current. The bq25040 has a single-power output that charges the battery. A system load can be placed in parallel with the battery. The charge current is programmed using the ISET and EN/SET inputs. -
Page 3: Test Summary
Test Summary www.ti.com Test Summary This section covers the setup and tests performed in evaluating the EVM. Equipment • Power supply +5.1 ±0.1 V, current limit set to 1.5 ±0.1 A • Battery: 4.2 V LiCoO2 or equivalent • LDO Load: from 100-Ω to 10k-Ω resistor •... -
Page 4: One-Pulse Programming Shows Change From Usb500 To Iset Mode
Test Summary www.ti.com 5. Switch, S1, DOWN, then back UP. The scope captures one pulse on CH2 (Figure 2). The pulse must be less than 1.5-ms wide. If too wide, the potentiometer, R7, can adjust the pulse width. 6. Verify that the input current changes from 0.4 A to 0.51 A (one pulse programmed the IC for ISET mode). -
Page 5: Two-Pulse Programming Shows Timing Of Program Change From 0.4 A To 0.1 A
Test Summary www.ti.com Vbat Viset V_0.1 ohm_BAT Ven/set Figure 3. Two-Pulse Programming Shows Timing of Program Change From 0.4 A to 0.1 A Viset Vchg Figure 4. Power-Up Sequence Shows Timing Between Vin, Viset, Vpg, and Vchg. C1: Chg @ JMP1; C4: PG @ JMP8;... -
Page 6: Schematics
Schematics www.ti.com Schematics Figure 5. Basic EVM Charger Circuit Figure 6. Circuit for Programming Pulse (Typically Done by Host) 1.1-A, Single-Input, Single-Cell, Li-Ion Battery Charger With 50-mA LDO and 2.3-A Production Test Support SLUU358 – April 2009 Submit Documentation Feedback... -
Page 7: Layout
Layout www.ti.com Layout Figure 7. Assembly Layer Figure 8. Top Copper Layer SLUU358 – April 2009 1.1-A, Single-Input, Single-Cell, Li-Ion Battery Charger With 50-mA LDO and 2.3-A Production Test Support Submit Documentation Feedback... -
Page 8: Bill Of Materials
Bill of Materials www.ti.com Figure 9. Bottom Copper Layer Bottom View Bill of Materials Table 1. HPA437A Bill of Materials - bq25040 Count RefDes Value Description Size Part Number Capacitor, Ceramic, 25V, X5R, 10% 0805 ECJ-2FB1E105K Panasonic C2, C3, Capacitor, Ceramic, 10V, X5R, 10%... - Page 9 Bill of Materials www.ti.com Table 1. HPA437A Bill of Materials - bq25040 (continued) Count RefDes Value Description Size Part Number G12AP Switch, ON-ON Mini Toggle 0.28 0.18 inch G12AP TP1, TP2, Test Point, O.032 Hole 5012 Keystone TP6, TP10 BQ25040DQC IC, 1.2A, Single-Input, 1 Cell Li-Ion...
- Page 10 EVALUATION BOARD/KIT IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards.
- Page 11 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
- Page 12 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Texas Instruments BQ25040EVM...
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