Rainbow-electronics MAX1802 Bedienungsanleitung PDF herunterladen (Seite 3)

MAX1802

Digital Camera Step-Down

Power Supply

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ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V

VDDM

= 6V, V

VDDC

= 3V, PGNDM = PGND = GND, DCON1 = REF, V

ONM

= 3V, V

ONC

= V

ON1

= V

DCON2

DCON3

= 0, T

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

= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

REFERENCE

Reference Output Voltage V

REF

= 20µA 1.235 1.248 1.260 V

REF Load Regulation 10µA <

REF

< 200µA 5 9 mV

REF Line Rejection 2.7V < V

OUT

< 5.5V 1 5 mV

REF Undervoltage Lockout

Threshold

REF rising, 20mV hysteresis 0.9 1 1.1 V

OSCILLATOR

OSC Discharge Trip Level OSC rising 1.225 1.250 1.275 V

OSC Input Bias Current V

OSC

= 1.1V 0.2 100 nA

OSC Discharge Resistance V

OSC

= 1.5V 30 100 Ω

OSC Discharge Pulse Width 100 ns

LOGIC INPUTS (ONM, ONC, ON1)

Input Low Level V

0.4 V

ONM 1.8

Input High Level V

ONC, ON1 1.6

Input Leakage Current

ONM: V

= 0 or 11V;

ONC, ON1: V

= 0 or 5V

0.01 1 µA

MAIN DC-DC CONVERTER

Main Output Voltage Adjust

Range

OUT

2.7 5.5 V

Main Idle Mode™ Threshold

OSC

= 0.625V, measured between VDDM

and LXM

8 20 32 mV

Main Current-Sense Amplifier

Voltage Gain

VCSM

Measured between VDDM and LXM 8.4 9.3 10.2 V/V

Main N Channel Turn-Off

Threshold

Measured between LXM and PGNDM -26 -17 -8 mV

Main Slope Compensation

Gain

VSWM

0.16 0.20 0.24 V/V

MAIN ERROR AMPLIFIER

FBM Regulation Voltage Unity gain configuration, FBM = COMPM 1.233 1.248 1.263 V

FBM to COMPM

Transconductance

Unity gain configuration, FBM = COMPM,

-5µA < I

LOAD

< 5µA

70 100 160 µS

FBM Input Leakage Current V

FBM

= 1.35V 5 100 nA

COMPM Minimum Output

Voltage

FBM

= 1.35V, COMPM open 0.3 V

COMPM Maximum Output

Voltage

COMPM

(

MAX

)

FBM

= 1.15V, COMPM open 2.00 2.14 2.27 V

Idle Mode is a trademark of Maxim Integrated Products.

1 2 3 4 5 6 7 8 ... 27 28

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