MAX850 datasheet(2/8 Pages) MAXIM

2 / 8 page

Low-Noise, Regulated, Negative

Charge-Pump Power Supplies for GaAsFET Bias

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(+5V

≤ VIN ≤ +10V, GND = 0V, VOUT = -4.1V, RL = ∞, TA = TMIN to TMAX, unless otherwise noted. A 100kHz, 50% duty cycle square

wave between GND and VIN is applied to OSC on the MAX852.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

Note 1: The output may be shorted to NEGOUT or GND if the package power dissipation is not exceeded. Typical short-circuit

current to GND is 50mA.

Note 2: The supply voltage can drop to 4.5V, but the output may no longer sink 5mA at -4.1V.

Note 3: The MAX852 will operate with a 50kHz to 250kHz square wave of 40% to 60% duty cycle. For best performance, use an

80kHz to 120kHz square wave with 50% duty cycle.

Supply Voltage, VIN to GND ..................................-0.3V to 10.5V

VNEGOUT to GND ...................................................-10.5V to 0.3V

VIN to VNEGOUT .........................................................-0.3V to 21V

VOUT to GND (Note 1) ........................................VNEGOUT to 0.3V

SHDN or OSC (pin 4) Voltage to GND.........-0.3V to (VIN + 0.3V)

Continuous Power Dissipation (TA = +70°C)

SO (derate 5.88mW/°C above +70°C) ........................471mW

Operating Temperature Ranges

MAX85_ISA ......................................................-25°C to +85°C

MAX85_ESA.....................................................-40°C to +85°C

Storage Temperature Range .............................-65°C to +160°C

Lead Temperature (soldering, 10sec) .............................+300°C

Pin 4

MAX850–MAX852, VFB = 0V,

RL = ∞ or 820Ω, Figure 2a

Pin 4

MAX850/MAX851/MAX853, TA = +25°C

MAX853

MAX850–MAX852

MAX853, VCTRL = 4.1V,

RL = ∞ or 820Ω, Figure 2c

MAX850/MAX853, VIN = 10V, SHDN = 0V

MAX850–MAX852, VFB = 0V,

RL = ∞ or 820Ω, Figure 2a

MAX850–MAX852, no load, Figure 2b

MAX853, VCTRL = 4.1V,

RL = ∞ or 820Ω, Figure 2c

MAX852, OSC low

MAX851, SHDN = 2V

CONDITIONS

CIN

Input Capacitance

µA

±1

IIN

Input Current

0.5

VIL

Input Low Voltage

2.0

VIH

Input High Voltage

kHz

100

120

fOSC

Oscillator Frequency (Note 3)

mVp-p

VOUT Ripple

mV/mA

VOUT Load Regulation

µA

ISHUT

Shutdown Supply Current

-4.3

-4.1

-3.9

510

VIN

Supply Voltage Range (Note 2)

0.002

2.0

3.0

Supply Current

-1.32

-1.28

-1.24

VFBset

Set Voltage

-0.5 to -(VIN - 1)

Output Voltage Range

-4.2

-4.0

VOUT

Output Voltage

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

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