Rainbow-electronics MAX1800 Manual do Utilizador descarregar pdf (Página 3)

MAX1800

Digital Camera Step-Up

Power Supply

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V

OUT

= V

POUT

= 3.3V, PGND = GND, V

ONM

= 3.3V, V

ON1

= V

ON2

= V

ON3

= V

ONA

= 0, T

= -40°C to +85°C,

unless otherwise noted. Typical values are at T

= +25°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

LOGIC INPUTS (ONM, ON1, ON2, ON3, ONA)

1.1V < V

OUT

< 1.8V (ONM only) 0.2

Input Low Level V

1.8V < V

OUT

< 5.5V 0.4

1.1V < V

OUT

< 1.8V (ONM only)

OUT

0.2

Input High Level V

1.8V < V

OUT

< 5.5V 1.6

Input Leakage Current V

= 0 or V

= V

OUT

= 5.5V 0.01 1 µA

MAIN DC/DC CONVERTER

Main Output Voltage Adjust

Range

OUT

2.7 5.5 V

Main Undervoltage Lockout

Threshold (Note 3)

Rising edge 2.2 2.35 2.6 V

Main Output Maximum Duty

Cycle

Measured at LX output, V

FBM

= 1V 80 85 88 %

Idle-Mode™ Threshold V

OSC

= 0.625V 0.3 A

ERROR AMPLIFIER

FBM Regulation Voltage Unity gain configuration, FBM = COMPM 1.23 1.250 1.27 V

FBM to COMPM

Transconductance

Unity gain configuration, FBM = COMPM,

-5µA < I

LOAD

< +5µA

60 100 140 µS

FBM to COMPM Maximum

Voltage Gain

2000 V/V

FBM Input Leakage Current V

FBM

= 1.35V 0.01 100 nA

COMPM Minimum Output

Voltage

FBM

= 1.35V, COMPM open 0.1 V

COMPM Maximum Output

Voltage

FBM

= 1.15V, COMPM open 2.00 2.15 2.30 V

POWER SWITCHES

POUT Leakage Current V

= 0, V

POUT

= 5.5V 0.1 20 µA

LX Leakage Current V

= V

OUT

= 5.5V 0.1 20 µA

N-channel 100 180

Switch On- Resistance R

P-channel 200 350

mΩ

N-Channel Current Limit 2 A

P-Channel Turn-Off Current 40 120 190 mA

POWER READY

RDYM Trip Level V

FBM

rising edge, 1% typical hysteresis 1.09 1.125 1.16 V

RDYM Output High Leakage V

RDYM

= 5.5V 0.01 1 µA

RDYM Output Voltage Low I

SINK

= 1mA 0.4 V

Idle Mode is a trademark of Maxim Integrated Products.

1 2 3 4 5 6 7 8 ... 23 24

Digital Camera Step-Up 1
Power Supply 1

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