MAX850ESA+-MAX850ISA+-MAX853CSA-MAX853ESA+ Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX853ESA ,Low-Noise / Regulated / Negative Charge-Pump Power Supplies for GaAsFET Bias
MAX853ESA ,Low-Noise / Regulated / Negative Charge-Pump Power Supplies for GaAsFET Bias
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MAX850ESA+-MAX850ISA+-MAX853CSA-MAX853ESA+
Low-Noise, Regulated, Negative Charge Pump Power Supplies for GaAsFET Bias
_______________General Description
The MAX850–MAX853 low-noise, inverting, charge-
pump power supplies are ideal for biasing GaAsFETs in
cellular telephone transmitter amplifiers.
The MAX850–MAX852 offer both preset (-4.1V) and
adjustable (-0.5V to -9.0V) output voltages. The
MAX853 uses an external positive control voltage to set
the negative output voltage. Input voltage range for all
four devices is 4.5V to 10V. Output current is 5mA.
An internal linear regulator reduces the output voltage
ripple to 2mVp-p. With a well-filtered control voltage
(VCTRL), the MAX853 achieves typical output ripple of
less than 1mVp-p. Supply current is 3mA max, and
shutdown current is less than 1μA max over temperature
(5μA max for MAX851).
________________________Applications
Cellular Phones
Negative Regulated Power Supplies
Personal Communicators, PDAs
Wireless Data Loggers
Continuously Adjustable GaAsFET Bias
LCD-Bias Contrast Control
____________________________FeaturesFixed -4.1V or Adjustable -0.5V to -9V Output at 5mA4.5V to 10V Input Voltage Range2mVp-p Output Voltage Ripple (MAX850–MAX852)
1mVp-p Output Voltage Ripple (MAX853)100kHz Charge-Pump Switching Frequency
(MAX850/MAX851/MAX853)External Synchronizing Clock Input (MAX852)Logic-Level Shutdown Mode: 1μA Max Over
Temperature (MAX850/MAX852/MAX853)Low Cost, 8-Pin SO Package
Low-Noise, Regulated, Negative
Charge-Pump Power Supplies for GaAsFET Bias
________________________________________________________________Maxim Integrated Products1
GND
OUT
FB**
(MAX850–852)
SHDN*
(MAX850/853)
NEGOUT
C1-
C1+
MAX850
MAX851
MAX852
MAX853
TOP VIEW
* SHDN (MAX851)
OSC (MAX852)
** CONT (MAX853)
__________________Pin Configuration
MAX850
MAX851
MAX852
OUT
SHDN*
SHDN
OSC
NEGOUT
C1-
C1+
GND
VIN = 4.5V to 10.0V
(4 CELLS)
VOUT = -4.1V
(VGG of GaAsFET)
* MAX850: SHDN
MAX851: SHDN
MAX852: OSC
__________Typical Operating Circuit
19-0238; Rev 2; 4/96
PART
MAX850ISA
MAX850ESA-40°C to +850°C
-25°C to +85°C
TEMP. RANGEPIN-PACKAGE
8 SO
8 SO
______________Ordering Information
* Dice are specified at TA= +25°C only.
& the latest literature: http://,
MAX851C/D0°C to +70°CDice*
MAX851ISA-25°C to +85°C8 SO
MAX851ESA-40°C to +85°C8 SO
MAX852C/D
MAX852ISA
MAX852ESA-40°C to +85°C
-25°C to +85°C
0°C to +70°CDice*
8 SO
ise*
8 SO
MAX853C/D0°C to +70°CDice*
MAX853ISA-25°C to +85°C8 SO
MAX853ESA-40°C to +85°C8 SO
MAX850C/D0°C to +70°CDice*
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
Low-Noise, Regulated, Negative
Charge-Pump Power Supplies for GaAsFET Bias_____________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(+5V ≤VIN≤+10V, GND = 0V, VOUT= -4.1V, RL= ∞, TA= TMINto TMAX, unless otherwise noted. A 100kHz, 50% duty cycle square
wave between GND and VINis 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, VINto GND..................................-0.3V to 10.5V
VNEGOUTto GND...................................................-10.5V to 0.3V
VIN to VNEGOUT.........................................................-0.3V to 21V
VOUTto GND (Note 1)........................................VNEGOUTto0.3V
SHDNor 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
Pin 4
Pin 4
MAX850–MAX852, VFB = 0V,= ∞or 820Ω, Figure 2a
Pin 4
MAX850/MAX851/MAX853, TA= +25°C
MAX853
MAX850–MAX852
MAX853, VCTRL = 4.1V,= ∞or 820Ω, Figure 2c
MAX850/MAX853, VIN= 10V, SHDN= 0V
MAX850–MAX852, VFB = 0V,= ∞or 820Ω, Figure 2a
MAX850–MAX852, no load, Figure 2b
MAX853, VCTRL = 4.1V,= ∞or 820Ω, Figure 2c
MAX852, OSC low
MAX851, SHDN = 2V
CONDITIONS10CINInput Capacitance±1IINInput Current0.5VILInput Low Voltage2.0VIHInput High Voltage
kHz80100120fOSCOscillator Frequency (Note 3)
mVp-p1VOUTRipple2
mV/mA8
VOUTLoad Regulation8
ISHUTShutdown Supply Current25
-4.3-4.1 -3.9510VINSupply Voltage Range (Note 2)
0.00212.03.0IQSupply Current-1.32-1.28-1.24VFBsetSet Voltage-0.5 to -(VIN- 1)Output Voltage Range
VOUTOutput Voltage
UNITSMINTYPMAXSYMBOLPARAMETER
Low-Noise, Regulated, Negative
Charge-Pump Power Supplies for GaAsFET Bias
_______________________________________________________________________________________3
OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX850-TOC1
OUTPUT CURRENT (mA)
T V
(V
OUTPUT VOLTAGE vs.
INPUT VOLTAGE OVER TEMPERATURE
MAX850-TOC2
INPUT VOLTAGE (V)
(V
TA = +25°C
TA = -40°C
TA = +85°C
IOUT = 2.5mA
5.06.07.08.09.0 10.0
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
MAX850-TOC3
INPUT VOLTAGE (V)
T C
(m
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX850-TOC4
INPUT VOLTAGE (V)
(m
SUPPLY CURRENT
vs. TEMPERATURE
MAX850-TOC5
TEMPERATURE (°C)
(m6080
VIN = 10.0V
START-UP TIME vs.
INPUT VOLTAGE
MAX850-TOC6
INPUT VOLTAGE (V)
TIM
(m
IOUT = 5mA
EFFICIENCY vs. LOAD CURRENT
MAX850-TOC7
LOAD CURRENT (mA)
(%VIN = 6.0V
VIN = 5.0V
VIN = 10.0V
__________________________________________Typical Operating Characteristics
(Circuit of Figure 2a, VIN= 6V, TA = +25°C, unless otherwise noted.)
Low-Noise, Regulated, Negative
Charge-Pump Power Supplies for GaAsFET Bias______________________________________________________________________________________
VIN = 6.0V, VOUT = -4.1V, IOUT = 5mA, AC COUPLED
MAX850–MAX852
OUTPUT NOISE AND RIPPLE
VOUT
500mV/div
10ms/div
_____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 2a, VIN= 6V, TA = +25°C, unless otherwise noted.)
VIN = 6.0V, VOUT = -4.1V, IOUT = 5mA, AC COUPLED
MAX853
OUTPUT NOISE AND RIPPLE
VOUT
500mV/div
10ms/div
MAX850–MAX852
NOISE SPECTRUM
E (d
FREQUENCY (kHz)
MAX853
NOISE SPECTRUM
E (d
FREQUENCY (kHz)
NOTE: dBµV = 20 log VOUT
1µV
Low-Noise, Regulated, Negative
Charge-Pump Power Supplies for GaAsFET Bias
_______________________________________________________________________________________5
_____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 2a, VIN= 6V, TA = +25°C, unless otherwise noted.)
CIRCUIT OF FIGURE 2a, VIN = 6.0V, VOUT = -4.1V, IOUT = 5mA
MAX850/MAX851/MAX853
START-UP FROM SHUTDOWN
VOUT
2V/div
VSHDN
5V/div
200ms/div
CIRCUIT OF FIGURE 2a, VIN = 6.0V, VOUT = -4.1V, IOUT = 5mA
SHUTDOWN OCCURS WHEN 100kHz EXTERNAL CLOCK IS GATED OFF
MAX852
START-UP FROM SHUTDOWN
VOUT
2V/div
VOSC
5V/div
200ms/div
VOUT = -4.08V, IOUT = 5mA, AC COUPLED
LINE-TRANSIENT RESPONSE
VOUT
20mV/div
VIN
6.0V
5.5V
2ms/div
VOUT = -4.0V, AC COUPLED
LOAD-TRANSIENT RESPONSE
IOUT
0.01mA
5mA
VOUT
50mV/div
1ms/div
Low-Noise, Regulated, Negative
Charge-Pump Power Supplies for GaAsFET Bias______________________________________________________________________________________
______________________________________________________________Pin Description
MAX850
MAX851
MAX852
-1.28V
REF
CHARGEPUMP
C1+
C1-
NEGOUT
SHDN (MAX850)
SHDN (MAX851)
OSC (MAX852)
OUT
CONNECT TO
GND TO SET
VOUT = -4.1V
GND
MAX853
CHARGEPUMP
C1+
C1-
NEGOUT
SHDN
OUT
CONTROLVOLTAGE
CONT
GND
_______________Detailed Description
The MAX850–MAX853 are low-noise, inverting, regulat-
ed charge-pump power supplies designed for biasing
GaAsFET devices, such as power-amplifier modules in
cellular handsets.
The applied input voltage (VIN) is first inverted to a
negative voltage at NEGOUT by a capacitive charge
pump. This voltage is then regulated by an internal lin-
ear regulator, and appears at OUT (Figure 1). The mini-
mum (most negative) output voltage (VOUT) achievable
is the inverted positive voltage, plus the 1.0V required
by the post-regulator. The ripple noise induced by the
charge-pump inverter is reduced by the linear regulator
to 2mVp-p at VOUTfor the MAX850–MAX852. In addi-
tion, the excellent AC rejection of the linear regulator
attenuates noise on the incoming supply. Up to 5mA is
available at OUT.
Figure 1a. MAX850–MAX852 Block DiagramFigure 1b. MAX853 Block Diagram
MAX850
MAX851
MAX853
PIN
MAX852
NAME
C1+
FUNCTION
Positive terminal for C13
NEGOUT
SHDNC1-
Negative Output Voltage (unregulated), VNEGOUT= VIN+ 0.2V
Active-low TTL logic level Shutdown Input
Negative terminal for C1–
OSCSHDN
External Clock Input
Active-high TTL logic level Shutdown Input5–5FB
Dual-Mode Feedback Input. When FB is grounded, the output is preset to
-4.1V. To select other output voltages, connect FB to an external resistor
divider. See Figure 2b.5––CONTControl Voltage Input. To set VOUT, connect a resistor divider between
OUT and a positive control voltage between 0V and 10V. See Figure 2c.7
GNDOUT
Ground
Positive Power-Supply Input (4.5V to 10V)
Output Voltage

Partno	Mfg	Dc	Qty	Available	Descript
MAX850ISA+ \|MAX850ISA	MAXIM	N/a	18	avai	Low-Noise, Regulated, Negative Charge Pump Power Supplies for GaAsFET Bias
MAX850ESA+ \|MAX850ESA	MAXIM	N/a	630	avai	Low-Noise, Regulated, Negative Charge Pump Power Supplies for GaAsFET Bias
MAX853CSA	MAXIM	N/a	2500	avai	Low-Noise, Regulated, Negative Charge Pump Power Supplies for GaAsFET Bias
MAX853ESA+ \|MAX853ESA	MAXIM	N/a	152	avai	Low-Noise, Regulated, Negative Charge Pump Power Supplies for GaAsFET Bias