Rainbow-electronics MAX8730 Bedienungsanleitung PDF herunterladen (Seite 4)

MAX8730

Low-Cost Battery Charger

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1. V

SRC

= V

ASNS

= V

CSSP

= V

CSSN

= 18V, V

BATT

= V

CSIP

= V

CSIN

= 12V, V

VCTL

= V

ICTL

= 1.8V, MODE = float,

ACIN = 0, CLS = REF, REFON = LDO, INPON = LDO, RELTH = 2V. T

= 0°C to +85°C, unless otherwise noted. Typical values are at

= +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Normal mode 4 6 mA

INPON =

REFON

= low

10 20

INPON = low,

REFON

= high

300

600

INPON = high,

REFON

= low

300

600

SRC Quiescent Current

(INPON/REFON = Don’t Care)

SRC

= V

BATT =

12V, ASNS =

GND

(Note 2)

INPON =

REFON

= high

350

600

µA

BATT

= 16.8V, V

SRC

= 19V, ICTL = 0 8 16

BATT Input Current

BATT

= 2V to 19V, V

SRC

> V

BATT

+ 0.3V

300

600

µA

CSIP

+ I

CSIN

+ I

BATT

, ASNS = GND 2 5

REFON

= 5.4V

300

600

Battery-Leakage Current

CSIP

+ I

CSIN

+ I

BATT

CSSP

+ I

CSSN

+ I

SRC

ASNS = REFON = GND

INPON = GND

2 5

µA

LDO Output Voltage 8.0V < V

SRC

< 28V, no load 5.2

5.35

5.5 V

LDO Load Regulation 0 < I

LDO

< 10mA 20 50 mV

LDO Undervoltage Lockout

Threshold

SRC

= 8.0V 4 V

REFERENCES

REF Output Voltage Ref

4.18 4.20 4.22

REF Undervoltage Lockout

Threshold

REF falling 3.1 3.9 V

SWREF Output Voltage 8.0V < V

SRC

< 28V, no load

3.234

3.3

3.366

SWREF Load Regulation 0.1mA < I

SWREF

< 20mA

20 50 mV

TRIP POINTS

ACIN Threshold ACIN rising

2.037

2.1

2.163

ACIN Threshold Hysteresis 60 mV

ACIN Input Bias Current V

ACIN

= 2.048V -1 +1 µA

SWITCHING REGULATOR

DHI Off-Time V

BATT

= 16.0V

300 350

400 ns

DHI Off-Time K Factor V

BATT

= 16.0V 4.8 5.6 6.4

V x µs

Sense Voltage for Minimum

Discontinuous Mode Ripple

Current

CSIP

- V

CSIN

7 mV

Cycle-by-Cycle Current-Limit

Sense Voltage

160 200

240 mV

Charge Disable Threshold V

SRC

- V

BATT

, SRC falling 40 60 80 mV

DHIV Output Voltage With respect to SRC

-4.3 -4.8

-5.5 V

DHIV Sink Current 10 mA

1 2 3 4 5 6 7 8 9 ... 28 29

Low-Cost Battery Charger 1

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