MAX768EEE Maxim Integrated Products, MAX768EEE Datasheet

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MAX768EEE

Manufacturer Part Number
MAX768EEE
Description
Charge Pumps Regulated Charge Pump
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX768EEE

Function
Inverting, Step Up
Output Voltage
+/- 5 V, +/- 1.25 V to +/- 11 V
Output Current
5 mA
Maximum Operating Temperature
+ 85 C
Package / Case
QSOP-16
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Case
ssop
Dc
98+

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MAX768EEE
Manufacturer:
MAXIM/美信
Quantity:
20 000
Part Number:
MAX768EEE-TG074
Manufacturer:
MAXIM
Quantity:
2 000
The MAX768 low-noise, dual-output, regulated charge
pump provides a negative output for biasing GaAsFET
power amplifiers, and a positive output for powering
voltage-controlled oscillators (VCOs) in wireless hand-
sets. The outputs can also be used to power LCDs.
Output ripple is less than 2mVp-p. The MAX768 is
intended for use in low-voltage systems where a simple
charge-pump inverter is inadequate, or where the VCO
needs more range to improve its signal-to-noise ratio.
The input range is 2.5V to 5.5V, enabling direct power
from 1Li+ and 3-cell NiMH/NiCd batteries.
The MAX768 includes a voltage-doubler charge pump,
followed by an inverting charge pump. This combina-
tion produces unregulated outputs that are ±2x the
input. Two internal low-dropout linear regulators provide
the low-noise, regulated positive and negative outputs.
Output current is guaranteed to be at least 5mA per
output. The linear regulators use CMOS devices, so the
quiescent current remains independent of output load-
ing (even in dropout), and the dropout voltage
approaches zero with no load current.
The MAX768 has two preset switching frequencies
(25kHz or 100kHz), or can be synchronized by an exter-
nal clock from 20kHz to 240kHz. This flexibility permits
users to optimize their designs based on noise, capaci-
tor size, and quiescent-supply-current criteria.
The device features Dual Mode™ operation: the output
voltage is preset to +5V and -5V, or can be adjusted by
adding external resistor dividers. Other features include
independent shutdowns and a logic output that signals
when the negative voltage has risen to within 10% of its
regulation setpoint (to protect the power amplifier
GaAsFET). The MAX768 is available in a space-saving,
16-pin QSOP, which is the same size as a standard
8-pin SO.
________________________Applications
19-1174; Rev 0; 12/96
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
Low-Noise, Dual-Output, Regulated Charge Pump
_______________General Description
GaAsFET Power Amp Bias
Voltage-Controlled Oscillator (VCO) Supply
Tuner Diode Power Supply
Positive and Negative LCD Supply
Cellular Phone
PCS and Cordless Phone
Wireless Handsets
Wireless Handheld Computers
Wireless PCMCIA Cards
Modems
________________________________________________________________ Maxim Integrated Products
for GaAsFET, LCD, and VCO Supplies
____________________________Features
* Dice are specified at T
Pin Configuration appears at end of data sheet.
Dual Mode is a trademark of Maxim Integrated Products.
__________Typical Operating Circuit
______________Ordering Information
MAX768C/D
MAX768EEE
Dual Positive/Negative Regulated Outputs:
±5V
Output-Ready Indicator to Protect GaAsFET PAs
2.5V to 5.5V Input Voltage Range
Low-Noise Output Ripple: < 2mVp-p
Synchronizable Switching Frequency
Uses Only Small, Low-Cost Capacitors
0.1µA Independent Shutdown Controls
Adjustable Output Voltages
Small 16-Pin QSOP Package
C2
C1
PART
OUT
from 3V
SYNC
C1+
C1-
C2+
C2-
PSHDN
NSHDN
SETN
(3.0V TO 5.5V)
MAX768
-40°C to +85°C
IN
TEMP. RANGE
A
GND
0°C to +70°C
V
IN
= +25°C, DC parameters only.
IN
SETP
NOUT
POUT
C7
RDY
V+
V-
C3
C4
16 QSOP
PIN-PACKAGE
Dice*
C5
C6
POSITIVE
OUTPUT
+5V
NEGATIVE
OUTPUT
-5V
OUTPUT-
READY
SIGNAL
1

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MAX768EEE Summary of contents

Page 1

... Small 16-Pin QSOP Package ______________Ordering Information PART TEMP. RANGE PIN-PACKAGE MAX768C/D 0°C to +70°C Dice* MAX768EEE -40°C to +85°C 16 QSOP * Dice are specified +25°C, DC parameters only. A Pin Configuration appears at end of data sheet. Dual Mode is a trademark of Maxim Integrated Products. __________Typical Operating Circuit ...

Page 2

... Continuous Power Dissipation (T QSOP (derate 8.70mW/°C above +70°C) ......................696mW Operating Temperature Range MAX768EEE.......................................................-40°C to +85°C Maximum Junction Temperature .....................................+150°C Storage Temperature Range .............................-65°C to +165°C Lead Temperature (soldering, 10sec) .............................+300°C = -40°C to +85°C, unless otherwise noted. Typical values ...

Page 3

Low-Noise, Dual-Output, Regulated Charge Pump for GaAsFET, LCD, and VCO Supplies ELECTRICAL CHARACTERISTICS (continued) = +3V, SYNC = IN, SETN = SETP = GND, NSHDN = PSHDN = IN are +25°C. See Figure 2.) ...

Page 4

Low-Noise, Dual-Output, Regulated Charge Pump for GaAsFET, LCD, and VCO Supplies ____________________________Typical Operating Characteristics (continued) (SYNC = IN +25°C, unless otherwise noted.) A SUPPLY CURRENT vs. SYNC FREQUENCY 5. 3.3V ...

Page 5

Low-Noise, Dual-Output, Regulated Charge Pump for GaAsFET, LCD, and VCO Supplies _____________________________Typical Operating Characteristics (continued) (SYNC = IN +25°C, unless otherwise noted.) A POUT MAXIMUM OUTPUT CURRENT vs. SUPPLY VOLTAGE 140 ONLY POUT LOADED 120 100 80 60 ...

Page 6

Low-Noise, Dual-Output, Regulated Charge Pump for GaAsFET, LCD, and VCO Supplies ______________________________________________________________Pin Description PIN NAME 1 C1- Negative Terminal of the Doubler Charge-Pump Capacitor. See Table 2 for capacitor selection. 2 GND Ground 3 C2- Negative Terminal of the Inverter ...

Page 7

Low-Noise, Dual-Output, Regulated Charge Pump for GaAsFET, LCD, and VCO Supplies IN V+ C1+ C1- PSHDN SYNC NSHDN C2+ C2- V- Figure 1. Functional Diagram _______________Detailed Description The MAX768 requires only seven external capacitors to implement a regulated voltage doubler/inverter. ...

Page 8

Low-Noise, Dual-Output, Regulated Charge Pump for GaAsFET, LCD, and VCO Supplies Table 1. Shutdown-Control Logic PSHDN NSHDN Table 2. Charge-Pump Capacitor Selection (Figure 2) SYNC FREQUENCY INPUT (kHz) GND 25 IN 100 ...

Page 9

Low-Noise, Dual-Output, Regulated Charge Pump for GaAsFET, LCD, and VCO Supplies V POUT V POUT IN IN SYNC SETP C1 MAX768 C1- C2+ GND C2 C2- V- NSHDN SETN PSHDN NOUT V NOUT RDY Figure 3. MAX768 Adjustable ...

Page 10

Low-Noise, Dual-Output, Regulated Charge Pump for GaAsFET, LCD, and VCO Supplies __________________Pin Configuration TOP VIEW 1 16 C1- GND MAX768 NOUT 6 11 SETN 7 10 NSHDN 8 9 PSHDN ...

Page 11

Low-Noise, Dual-Output, Regulated Charge Pump for GaAsFET, LCD, and VCO Supplies ________________________________________________________Package Information ______________________________________________________________________________________ INCHES MILLIMETERS DIM MIN MAX MIN MAX A 0.061 0.068 1.55 1.73 A1 0.004 0.0098 0.127 0.25 ...

Page 12

... Maxim reserves the right to change the circuitry and specifications without notice at any time. implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 ...

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