ISL6251 INTERSIL [Intersil Corporation], ISL6251 Datasheet
ISL6251
Available stocks
Related parts for ISL6251
ISL6251 Summary of contents
Page 1
... Data Sheet Low Cost Multi-Chemistry Battery Charger Controller The ISL6251, ISL6251A is a highly integrated battery charger controller for Li-Ion/Li-Ion polymer batteries and NiMH batteries. High Efficiency is achieved by a synchronous buck topology and the use of a MOSFET, instead of a diode, for selecting power from the adapter or battery ...
Page 2
... VREF 7 CHLIM ISL6251, ISL6251A CSOP 20 CSIN 19 CSIP PHASE 15 UGATE 13 14 ISL6251, ISL6251A (24 LD QSOP) TOP VIEW VDD DCIN 1 24 ACSET 2 23 ACPRN EN CSON 3 22 CELLS 4 21 CSOP ICOMP 5 20 CSIN VCOMP CSIP 6 19 ICM PHASE ...
Page 3
... Battery Charge Voltage Accuracy TRIP POINTS ACSET Threshold ACSET Input Bias Current Hysteresis ACSET Input Bias Current ACSET Input Bias Current 3 ISL6251, ISL6251A Thermal Information Thermal Resistance QFN Package (Notes 4, 6 QSOP Package (Note ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Level 2 Junction Temperature Range .-10°C to +150°C Operating Temperature Range . . . . . . . . . . . . . . . .-10° ...
Page 4
... VDDP-PGND=5V, 500mA sink current VDDP-PGND=5V, LGATE=2.5V Guarantee by design 0 < CSOP < 18V 0 < CSON < 18V ISL6251: CHLIM=3.3V ISL6251A, CHLIM=3.3V ISL6251: CHLIM=2.0V ISL6251A: CHLIM=2.0V ISL6251: CHLIM=0.2V ISL6251A: CHLIM=0.2V CHLIM=GND or 3.3V, DCIN=0V CHLIM rising Guarantee by design CSIP=CSIN=25V 0 < CSIN < DCIN, Guaranteed by design ≤ =0mA, T =-10°C to +100°C, T 125° ...
Page 5
... Thermal Shutdown Temperature Thermal Shutdown Temperature Hysteresis NOTE: 7. This is the sum of currents in these pins (CSIP, CSIN, BOOT, UGATE, PHASE, CSOP, CSON) all tied to 16.8V. No current in pins EN, ACSET, VADJ, CELLS, ACLIM, CHLIM. 5 ISL6251, ISL6251A =1µF, I VDD TEST CONDITIONS ACLIM=VREF ACLIM=Float ACLIM=GND ACLIM=VREF ...
Page 6
... CSIP-CSIN (mV) FIGURE 3. ICM ACCURACY vs AC ADAPTER CURRENT LOAD STEP: 0-4A CHARGE CURRENT ADAPTER CURRENT LIMIT: 5.15A FIGURE 5. LOAD TRANSIENT RESPONSE 6 ISL6251, ISL6251A DCIN=20V, 4S2P Li-Battery VDD=5.075V VDD=5.075V EN=0 EN FIGURE 4. SYSTEM EFFICIENCY vs CHARGE CURRENT ...
Page 7
... Typical Operating Performance BATTERY BATTERY INSERTION INSERTION VCOMP VCOMP ICOMP ICOMP FIGURE 7. BATTERY INSERTION AND REMOVAL FIGURE 9. SWITCHING WAVEFORMS IN CC MODE 7 ISL6251, ISL6251A DCIN=20V, 4S2P Li-Battery INDUCTOR INDUCTOR CURRENT CURRENT 2A/div 2A/div BATTERY BATTERY REMOVAL REMOVAL CSON CSON 10V/div 10V/div ...
Page 8
... EN is the Charge Enable input. Connecting EN to high enables the charge control function, connecting EN to low disables charging functions. Use with a thermistor to detect a hot battery and suspend charging. 8 ISL6251, ISL6251A ICM ICM is the adapter current output. The output of this pin produces a voltage proportional to the adapter current. PGND PGND is the power ground ...
Page 9
... ISL6251, ISL6251A CSIP CSIP CSIP CSIP ICM ICM ICM ICM + + ACSET ACSET ACSET ACSET ACPRN ACPRN ACPRN ACPRN + + + + + - - - - - 1.27V 1.27V 1.26V 1.26V Adapter Adapter Adapter Adapter ACLIM ACLIM ACLIM ACLIM Current Limit Set Current Limit Set Current Limit Set Current Limit Set 2 ...
Page 10
... Trickle Charge CHLIM CHLIM R13 R11 1.87K 130K ACLIM ACLIM 1% 1% Trickle Charge Enable VREF VREF Q3 FIGURE 12. ISL6251, ISL6251A TYPICAL APPLICATION CIRCUIT WITH FIXED CHARGING PARAMETERS 10 ISL6251, ISL6251A D4 C8 0.1µF CSIP CSIP C2 R2 ISL6251 0.1µF ISL6251 20mΩ ISL6251A ISL6251A ...
Page 11
... INPUT CURRENT LIMIT C6 HOST 6.8nF R6 C5 10K 10nF AVDD/VREF R11, R12, R13 10k FLOATING 4.2V/CELL SCL SDL A/D INPUT GND FIGURE 13. ISL6251, ISL6251A TYPICAL APPLICATION CIRCUIT WITH MICRO-CONTROLLER 11 ISL6251, ISL6251A 0.1µF DCIN DCIN CSIP CSIP ACSET ACSET C2 0.1µF VDDP VDDP CSIN ...
Page 12
... A high efficiency synchronous buck converter is used to control the charging voltage and charging current up to 10A. The ISL6251, ISL6251A has input current limiting and analog inputs for setting the charge current and charge voltage; CHLIM inputs are used to control charge current and VADJ inputs are used to control charge voltage ...
Page 13
... By using the input current limiter, the current capability of the AC adapter can be lowered, reducing system cost. CELL NUMBER The ISL6251, ISL6251A limits the battery charge current 4 when the input current-limit threshold is exceeded, ensuring 3 the battery charger does not load down the AC adapter voltage ...
Page 14
... VDD through an external resistor. Bypass VDDP and VDD with a 1µF capacitor. Shutdown The ISL6251, ISL6251A features a low-power shutdown mode. Driving EN low shuts down the charger. In shutdown, the DC/DC converter is disabled, and VCOMP and ICOMP are pulled to ground. The ICM, ACPRN outputs continue to function ...
Page 15
... The maximum efficiency is achieved by selecting a high side MOSFET that has the conduction losses equal to the switching losses. Ensure that ISL6251 LGATE gate driver can supply sufficient gate current to prevent it from conduction, which is due to the injected current into the drain-to-source parasitic capacitor ...
Page 16
... Therefore, the ISL6251 easily drives the battery charge current up to 10A. Input Capacitor Selection The input capacitor absorbs the ripple current from the synchronous buck converter, which is given by − OUT IN OUT = I I rms BAT V IN This RMS ripple current must be smaller than the rated RMS current in the capacitor datasheet ...
Page 17
... REF REF + + + + FIGURE 15. VOLTAGE LOOP COMPENSATOR 17 ISL6251, ISL6251A ( ) where Compensator design goal: • High DC gain • Loop bandwidth f • Gain margin: >10dB • Phase margin: 40° The compensator design procedure is as follows: 1 ω ≈ 1. Put compensator zero at: ...
Page 18
... This trace is also the return path for UGATE. Connect this pin to the high-side MOSFET source. 18 ISL6251, ISL6251A UGATE Pin This pin has a square shape waveform with high dv/dt. It provides the gate drive current to charge and discharge the top MOSFET with high di/dt. This trace should be wide, short, and away from other traces similar to the LGATE ...
Page 19
... CORNER REF. OPTION 4X BOTTOM VIEW SECTION "C-C" TERMINAL TIP FOR ODD TERMINAL/SIDE FOR EVEN TERMINAL/SIDE 19 ISL6251, ISL6251A L28.5x5 28 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE (COMPLIANT TO JEDEC MO-220VHHD-1 ISSUE SYMBOL 0.10 C 0.08 C ...
Page 20
... However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 20 ISL6251, ISL6251A M24.15 24 LEAD SHRINK SMALL OUTLINE PLASTIC PACKAGE M ...