Rainbow-electronics MAX1870A Instrukcja Użytkownika Pobierz pdf (Strona 4)

MAX1870A

Step-Up/Step-Down

Li+ Battery Charger

4 _______________________________________________________________________________________

PARAMETER CONDITIONS

MIN

TYP

MAX

UNITS

REFERENCE

REF Output Voltage I

REF

= 0µA

4.076 4.096 4.116

V

REF Load Regulation 0 < I

REF

< 500µA 5 10 mV

REF Undervoltage-Lockout Trip

Point

V

REF

falling

3.1

3.9 V

REFIN Input Range 2.5 3.6 V

REFIN UVLO Rising

1.9

2.2 V

REFIN UVLO Hysteresis 50 mV

V

DCIN

= 18V 50 100

REFIN Input Bias Current

DCIN = 0, V

REFIN

= 3.6V -1 +1

µA

SWITCHING REGULATOR

C ycl e- b y- C ycl e S tep - U p M axi m um

C ur r ent- Li m i t S ense V ol tag e

V

DCIN

= 12V, V

BATT

= 16.8V

135

150

165 mV

C ycl e- b y- C ycl e S tep - D ow n

M axi m um C ur r ent- Li m i t S ense

V ol tag e

V

DCIN

= 19V, V

BATT

= 16.8V 135

150

165 mV

Step-Down On-Time V

DCIN

= 18V, V

BATT

= 16.8V 2.2

2.4

2.6 µs

Minimum Step-Down Off-Time V

DCIN

= 18V, V

BATT

= 16.8V

0.15 0.4 0.50

µs

Step-Up Off-Time V

DCIN

= 12V, V

BATT

= 16.8V 1.6

1.8

2.0 µs

Minimum Step-Up On-Time V

DCIN

= 12V, V

BATT

= 16.8V

0.15 0.3 0.40

µs

MOSFET DRIVERS

VHP - VHN Output Voltage 8V < V

VHP

< 28V, no load 4.5 5 5.5 V

VHN Load Regulation 0 < I

VHN

< 10mA 70 150 mV

DHI On-Resistance High I

SOURCE

= 10mA 2 5 Ω

DHI On-Resistance Low I

SINK

= 10mA 1 3 Ω

DCIN = 0

0.1

1 µA

VHP Input Bias Current

V

DCIN

= 18V

1.3

2 mA

ICTL = 0

0.1

2

BLKP Input Bias Current

V

ICTL

= V

REFIN

= 3.3V

100

400

µA

DLOV Supply Current DBST low 5 10 µA

DBST On-Resistance High I

SOURCE

= 10mA 2 5 Ω

DBST On-Resistance Low I

SINK

= 10mA 1 3 Ω

ERROR AMPLIFIERS

GMV Amplifier Loop

Transconductance

V C TL = RE FIN , V

BAT T

= 16.8V 0.05

0.1 0.20 µA/mV

GMI Amplifier Loop

Transconductance

ICTL = REFIN, V

CSIP

- V

CSIN

= 72mV 1.8

2.4

3.0

µA/mV

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 2, V

DCIN

= V

CSSP

= V

CSSN

= V

CSSS

= V

VHP

= 18V, V

BATT

= V

CSIP

= V

CSIN

= V

BLKP

= 12V, V

REFIN

= 3.0V, V

ICTL

=

0.75 x V

REFIN

, VCTL = LDO, CELLS = FLOAT, GND = PGND = 0, V

DLOV

= 5.4V, T

A

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

values are at T

A

= +25°C.)

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