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Test Summary

4 Test Summary

The bq25070EVM-740 board requires an adjustable 5 VDC, ≥ 1250 mA Current Limited power source to

provide input power and a LiFePO

battery as a load. The test setup connections and jumper settings

selections are configured for a stand-alone evaluation, but can be changed to interface with external

hardware such as a microcontroller.

4.1 Equipment

• Adjustable dc power supply with current meter, set between 5.1 V and 5.3 VDC with adjustable current

limit set to between 1200 and 1300 mA

• Load OUT: LiFePO

battery charged up between 3 V and 3.3 V, with > 1F of capacity

– See Figure 3 for an alternative “simulated battery replacement”.

• Load VLDO: 200 Ω resistor, 0.25W

• Three Fluke 75 DMMs (equivalent or better)

• Oscilloscope Model TDS222 (equivalent or better)

4.2 Equipment and EVM Setup

Table 1. Setup I/O Connections and Configuration for Evaluation of bq25070 EVM

Jack/Component (Silk Screen) Connect or Adjustment TO:

J1-1 (VIN) P/S positive lead, P/S preset to 5.1VDC; 1250mA current limit.

J1-2 (GND) P/S negative lead, P/S preset to 5.1VDC;

J3-1/2 (VLDO/GND) Connect 200 Ω resistor between pins

J2-1 (OUT) Positive LiFePO

battery lead

J2-2 (GND) Negative LiFePO

battery lead

S101 (Delivers Programmed Pulses) Set in down position

JP1-1/2 (TS 10k “on board” pull-down) Apply shunt to across pins 1 and 2 to connect 10k pull-down.

JP2-1/2 (CHG LED) Apply shunt to across pins 1 and 2 to connect LED to CHG pin.

JP3-1.2 (Connects “Pulsed Hardware” to CTRL pin

Apply shunt to across pins 1 and 2 to connect pulse hardware to CTRL pin.

on IC)

Place only one shunt on JP101 to JP113 (Set to JP107 from factory) to select

JP1xx-1/2 (Number of Pulse Selection)

desired number of pulses.

SLVU473– May 2011 1A, Single Cell LiFePO

Linear Battery Charger with 4.9 V, 50 mA LDO

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