Rainbow-electronics MAX8730 Manual do Utilizador descarregar pdf (Página 8)

MAX8730

Low-Cost Battery Charger

8 _______________________________________________________________________________________

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX

UNITS

REFERENCES

REF Output Voltage Ref 0 < I

REF

< 500µA

4.16

4.24

REF Undervoltage Lockout

Threshold

REF falling 3.9 V

SWREF Output Voltage 8.0V < V

SRC

< 28V, no load

3.224

3.376

SWREF Load Regulation 0.1mA < I

SWREF

< 20mA 50 mV

TRIP POINTS

ACIN Threshold ACIN rising

2.037

2.163

SWITCHING REGULATOR

DHI Off-Time V

BATT

= 16.0V 300 400 ns

DHI Off-Time K Factor V

BATT

= 16.0V 4.8 6.4

V x µs

Cycle-by-Cycle Current-Limit

Sense Voltage

160 240 mV

DHIV Output Volatge With respect to SRC

-4.3

-5.5

DHIV Sink Current 10 mA

DHI Resistance Low I

DHI

= -10mA 4 Ω

DHI Resistance High I

DHI

= 10mA 2 Ω

ERROR AMPLIFIERS

V C TL = 3.6V , V

BAT T

= 16.8V , M OD E = LD O

0.0625

0.250

GMV Loop Transconductance

V C TL = 3.6V , V

BAT T

= 12.6V , M OD E = FLOAT 0.0833

0.333

mA/V

GMI Loop Transconductance ICTL = 3.6V, V

CSSP

- V

CSIN

= 75mV 0.5 2

mA/V

GMS Loop Transconductance V

CLS

= 2.048V, V

CSSP

- V

CSSN

= 75mV 0.5 2

mA/V

CCI/CCS/CCV Clamp Voltage

1.1V < V

CCV

< 3.0V, 1.1V < V

CCI

< 3.0V,

1.1V < V

CCS

< 3.0V

150 600 mV

LOGIC LEVELS

M OD E , RE FON Inp ut Low V ol tag e 0.5 V

MODE Input Middle Voltage 1.9 3.3 V

M OD E , RE FON Inp ut H i g h V ol tag e

3.4 V

INPON

rising

2.2

INPON Threshold

INPON

falling 0.8

ADAPTER DETECTION

ACOK Voltage Range 0 28 V

ACOK Sink Current V

ACOK

= 0.4V, ACIN = 1.5V 1 mA

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

= -40°C to +85°C, unless otherwise noted.)

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 28 29

Low-Cost Battery Charger 1

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Rainbow-electronics MAX8730 Manual do Utilizador Página 8

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