MAX8765ETI-T Maxim Integrated, MAX8765ETI-T Datasheet
MAX8765ETI-T
Related parts for MAX8765ETI-T
MAX8765ETI-T Summary of contents
Page 1
... Up to 17.6V Battery-Voltage Set Point o Maximum 28V Input Voltage o > 95% Efficiency o Shutdown Control Input o Charge Any Battery Chemistry Li+, NiCd, NiMH, Lead Acid, etc. PART MAX1908ETI+ Applications MAX8724ETI+ MAX8765ETI+ MAX8765AETI+ + Denotes a lead(Pb)-free/RoHS-compliant package Exposed pad. TO EXTERNAL LOAD TOP VIEW DLOV BST DHI CSSN 10µ ...
Page 2
... 0. CELLS = open, CLS = VCTL ICTL REFIN = 1µF; CCI, CCS, and CCV are compensated REF = +25°C.) A MIN TYP -0.5 -0.5 -0.5 -0.4 -0.4 -0.4 4.0 4.1 2.5 1.20 71. ICTL REFIN -45 x 0.058 - 4.0 4 0.3V) DLOV MAX UNITS +0.5 +0.5 % +0.5 +0.4 +0.4 % +0.4 4.2 V 3.6 V 1.92 V 78. + Maxim Integrated ...
Page 3
... Input Current-Limit Accuracy Input Current-Limit Gain Error (MAX8765/MAX8765A Only) Input Current-Limit Offset (MAX8765/MAX8765A Only) CSSP, CSSN Input Voltage Range CSSP, CSSN Input Current (MAX1908/MAX8724 Only) CSSP Input Current (MAX8765/MAX8765A Only) Maxim Integrated = 12V 3V, V CSIP CSIN REFIN = 1µF, LDO = DLOV, C LDO SYMBOL ...
Page 4
... MIN TYP 0.1 DCIN V = 28V 0.1 DCIN 1.6 1 -7 350 IINP = open 3.5 IINP 8 7 7.4 7.5 3.2 = 19.3V 200 5.25 5.4 34 3.20 4 4.072 4.096 3.1 MAX UNITS 1 µA 1 REF V REF V +1 µA 3.3 µA/ +7.5 3.18 µA/ +10 µA µ 7. µA 500 5.55 V 100 mV 5.15 V 4.120 V 3.9 V Maxim Integrated ...
Page 5
... DHI Maximum Duty Cycle Minimum Discontinuous-Mode Ripple Current Battery Undervoltage Charge Current Battery Undervoltage Current Threshold DHI On-Resistance High DHI On-Resistance Low DLO On-Resistance High DLO On-Resistance Low Maxim Integrated = 12V 3V, V CSIP CSIN REFIN = 1µF, LDO = DLOV, C LDO SYMBOL ...
Page 6
... REFIN / 0.2V V REFIN - 0. 23.5 1 MAX UNITS 0.2500 µA/mV 2.0 µA/mV 2.0 µA/mV 600 µ µA LDO V +1 µ REFIN % of V REFIN Maxim Integrated ...
Page 7
... Cycle-by-Cycle Maximum Current Limit ICTL Power-Down Mode Threshold Voltage (MAX1908/MAX8724 Only) ICHG Transconductance (MAX1908/MAX8724 Only) ICHG Transconductance (MAX8765/MAX8765A Only) ICHG Transconductance Error (MAX8765/MAX8765A Only) ICHG Transconductance Offset (MAX8765/MAX8765A Only) Maxim Integrated = 12V 3V, V CSIP CSIN REFIN = 1µF, LDO = DLOV, C LDO SYMBOL CONDITIONS V ...
Page 8
... CCI, CCS, and CCV are compensated REF MIN TYP -7.5 -7.5 -40 71.25 -5 -7.5 - DCIN V = 28V DCIN DCIN V = 28V DCIN 1.6 1.1 2.7 2.785 -7.5 -12 -7.5 -7.5 MAX UNITS +7.5 % +7.5 +40 78. +7.5 + µA 600 1 µA 650 1 µA 1 REF V REF V 3.3 µA/mV 3.225 µA/mV +7.5 % +12 µA +7.5 % +7.5 Maxim Integrated ...
Page 9
... DHI Minimum Off-Time DHI Maximum On-Time DHI Maximum Duty Cycle Battery Undervoltage Charge Current Battery Undervoltage Current Threshold DHI On-Resistance High DHI On-Resistance Low DLO On-Resistance High DLO On-Resistance Low Maxim Integrated = 12V 3V, V CSIP CSIN REFIN = 1µF, LDO = DLOV, C LDO SYMBOL ...
Page 10
... CCS CURRENT 2A/div CCI V BATT 2V/div 1ms/div ICTL = LDO CHARGING CURRENT = 16.8V BATT LOAD STEP = LIMIT = 5A SOURCE MAX UNITS 0.250 µA/mV 2.0 µA/mV 2.0 µA/mV 600 LDO REFIN MAX1908 toc03 Maxim Integrated ...
Page 11
... CELLS 300 250 200 150 CHARGE 100 VCTL = ICTL = LDO (V) IN BATT Maxim Integrated Typical Operating Characteristics (continued) = +25°C, unless otherwise noted.) LDO LOAD REGULATION 0 -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 -0.7 -0 5.4V LDO -0.9 -1 LDO CURRENT (mA) REF VOLTAGE ERROR vs ...
Page 12
... Typical Operating Characteristics (continued) = +25°C, unless otherwise noted.) 1.5 2.0 ( ICHG ERROR vs. CHARGE CURRENT 5.0 4.5 4 3.3V REFIN 3.5 3 16V BATT 2 12V BATT 2 BATT 1.5 1.0 0 0.5 1.0 1.5 2.0 2.5 3.0 I (A) BATT IINP ERROR vs. INPUT CURRENT ERROR DUE TO SWITCHING NOISE 20 0 -20 SYSTEM LOAD = 0 -40 -60 -80 0 0.5 1.0 1.5 2.0 INPUT CURRENT (A) Maxim Integrated ...
Page 13
... Input Current-Sense Positive Input. Connect a current-sense resistor from CSSP to CSSN. Input-Current Monitor Output. IINP is a scaled-down replica of the input current. IINP monitors the total 28 IINP system current. The transconductance of (CSSP - CSSN) to IINP is 3µA/mV. Maxim Integrated FUNCTION / REFIN /100 while the MAX8765/MAX8765A does not. When ICTL is equal to ...
Page 14
... VCTL = × + × CELLS ⎜ ⎜ ⎝ ⎝ V REFIN MAX1908 MAX8724 Yes No Yes Yes REFIN must REFIN must be ready be ready CELL COUNT GND 2 Open 3 4 REFIN Maxim Integrated ⎞ ⎞ ⎟ ⎟ ⎠ ⎠ MAX8765/ MAX8765A No No Independent of REFIN ...
Page 15
... OUTPUT ADC INPUT ADC INPUT C14 R9 0.1µF 20kΩ HOST AVDD/REF R19, R20, R21 10kΩ SCL SDA ADC INPUT GND Figure 1. µC-Controlled Typical Application Circuit Maxim Integrated RS1 0.01Ω D1 0.1µF 0.1µF D2 CSSP R7 DCIN C5 19.6kΩ 1µF 1% LDO VCTL ICTL 12 ...
Page 16
... REFIN (4 CELLS SELECT) LDO C13 R13 1µF 33Ω D3 BST C15 C16 0.1µF 1µF N1a DHI LX N1b DLO L1 10µH CSIP RS2 0.015Ω CSIN BATT GND C4 22µF PGND GND TO EXTERNAL LOAD C1 2 × 10µF BATT + BATTERY THM BATT- Maxim Integrated ...
Page 17
... SHIFTER CSIN 75mV x ICTL REFIN CCI BATT R1 REFIN CELL SELECT CELLS LOGIC CCV 400mV x VCTL REFIN Figure 3. Functional Diagram Maxim Integrated MAX1908 LOGIC MAX8724 BLOCK MAX8765 MAX8765A SRDY GMS CSI GMI MAX1908 ONLY 3.1V/CELL BAT_UV LVC GMV 4V Functional Diagram RDY 5.4V 4.096V ...
Page 18
... INPUT LOAD × ⎝ determines the reference voltage of the GMS V 0 075 . CLS = × I INPUT REF Conditioning Charge AC Adapter Detection /2 with 20mV hysteresis. ACOK is an open-drain can be set by a ⎞ BATT ⎟ η ⎠ determine CLS Maxim Integrated ...
Page 19
... V V hysteresis to provide smooth shutdown when REFIN driven by a thermistor. Maxim Integrated The MAX1908/MAX8724/MAX8765/MAX8765A employ a buck regulator with a bootstrapped nMOS high-side switch and a low-side nMOS synchronous rectifier. The MAX1908/MAX8724/MAX8765/MAX8765A control input current (CCS control loop), charge current (CCI control loop), or charge voltage (CCV control loop), depending on the operating condition ...
Page 20
... OFF GENERATOR LVC GMS GMI GMV SETV SETI CLS CELLS DC-DC Functional Diagram CSSP CSS RS1 X20 CSSN BST N1a DHI DHI LX DLO N1b DLO CSIP CSI X20 CSIN BATT C OUT BATTERY CELL SELECT LOGIC AC ADAPTER LDO D3 C BST L1 RS2 Maxim Integrated ...
Page 21
... RIPPLE ( − CSSN BATT Maxim Integrated The MAX1908/MAX8724/MAX8765/MAX8765A enter dis- continuous-conduction mode when the output of the LVC control point falls below 0.15V. For RS2 = 0.015Ω, this corresponds to 0.5A: . The off-time is set for RS2 = 0.015Ω. In discontinuous mode, a new cycle is not started until − ...
Page 22
... 3kHz CO_CV ESR π × × × OUT ESR _ π × ESR OUT = BATT CHG. OUT × OGMV ) × × OUT L OUT = 80 kHz = Ω 412 . MHz Maxim Integrated ...
Page 23
... FREQUENCY (Hz) Figure 6. CCV Loop Gain/Phase vs. Frequency Maxim Integrated Compensation of the CCI loop depends on the parame- ters and components shown in Figure 7. C loop compensation capacitor the current-sense amplifier. RS2 is the charge cur kHz rent-sense resistor, RS2 = 15mΩ. R lent output impedance of the GMI amplifier ≥ ...
Page 24
... π × OGMI CI CCS Loop Definitions is the internal gain of CSS OGMS CCI LOOP PHASE vs. FREQUENCY 0 -15 -30 -45 -60 -75 -90 0 100 1k 10k 100k FREQUENCY (Hz 1/5th the kHz kHz 0 0016 . Hz is the CCS CS is the equivalent 1M Maxim Integrated ...
Page 25
... 2π C CCS LOOP GAIN vs. FREQUENCY 100 -20 -40 -60 0 FREQUENCY (Hz) Figure 10. CCS Loop Gain/Phase vs. Frequency Maxim Integrated : × OGMS × + × OGMS CS × Figure 9. CCS Loop Diagram The CCS loop dominant compensation pole: OGMS × ...
Page 26
... V V BATT DCIN = 0.3 × I RIPPLE CHG Input Capacitor 2 = − CHG = input capacitor ripple current. = battery-charging current the input-to-output voltage ratio is CHG < ESR )/V DCIN usually result in a Maxim Integrated ...
Page 27
... BST capacitor (C15). During the dead time (50ns, typ) between N1a and N1b, the current is carried by the body diode of Maxim Integrated the MOSFET. Choose N1b with either an internal Schottky diode or body diode capable of carrying the maximum charging current during the dead time ...
Page 28
... RS1 1 Vishay Dale WSL2010 0.010 1.0% IRC LRC-LR2010-01-R010-F 0.015Ω ±1%, 0.5W 2010 sense resistor RS2 1 Vishay Dale WSL2010 0.015 1.0% IRC LRC-LR2010-01-R015-F MAX1908ETI+, MAX8724ETI MAX8765ETI+, MAX8765AETI+ Maxim Integrated ...
Page 29
... Low-Cost Multichemistry Battery Chargers Chip Information TRANSISTOR COUNT: 3772 PROCESS: BiCMOS Maxim Integrated Package Information For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package draw- ings may show a different suffix character, but the drawing per- tains to the package regardless of RoHS status ...
Page 30
... Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. 30 © 2009 Maxim Integrated DESCRIPTION Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 The Maxim logo and Maxim Integrated are trademarks of Maxim Integrated Products, Inc. Revision History PAGES CHANGED — 1–30 ...