MAX868EUB+ Maxim Integrated Products, MAX868EUB+ Datasheet

IC CHARGE PUMP INV 10-UMAX

MAX868EUB+

Manufacturer Part Number
MAX868EUB+
Description
IC CHARGE PUMP INV 10-UMAX
Manufacturer
Maxim Integrated Products
Type
Switched Capacitor (Charge Pump), Doubler, Invertingr
Datasheet

Specifications of MAX868EUB+

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
-3.6 ~ -11 V
Current - Output
30mA
Frequency - Switching
450kHz
Voltage - Input
1.8 ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
10-MSOP, Micro10™, 10-uMAX, 10-uSOP
Power - Output
444mW
Function
Inverting
Output Voltage
- 3.6 V to - 11 V
Output Current
30 mA
Supply Current
0.05 mA
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX868 inverting charge pump provides a low-cost
and compact means of generating a regulated negative
voltage up to -2 x V
between 1.8V and 5.5V. It uses a pulse-frequency-
modulation (PFM) control scheme to generate the regulat-
ed negative output voltage. PFM operation is obtained
by gating the internal 450kHz oscillator on and off as
needed to maintain output voltage regulation. This
unique on-demand switching scheme gives the MAX868
excellent light-load efficiency without degrading its full-
load operation (up to 30mA), permitting smaller capaci-
tors to take advantage of the oscillator’s high switching
frequency.
The MAX868 requires no inductors; only four capacitors
are required to build a complete DC-DC converter.
Output voltage regulation is achieved by adding just two
resistors. The MAX868 comes in a 10-pin µMAX pack-
age, which is only 1.11mm high and occupies just half
the board area of a standard 8-pin SO.
________________________Applications
19-1290; Rev 1; 2/98
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
TOP VIEW
Small LCD Panels
Cell Phones
Cordless Phones
Camcorders
Handy-Terminals, PDAs
Medical Instruments
Battery-Operated Equipment
PGND
GND
OUT
C1+
C1-
________________________________________________________________ Maxim Integrated Products
1
2
3
4
5
IN
General Description
from a positive input voltage
MAX868
MAX
Configuration
10
9
8
7
6
FB
SHDN
C2+
IN
C2-
Regulated, Adjustable -2x
Inverting Charge Pump
* Dice are tested at T
____________________________Features
MAX868C/D
MAX868EUB
V
Regulated Negative Output Voltage
(up to -2 x V
Ultra-Small, 10-Pin µMAX Package
On-Demand Switching at up to 450kHz
30µA Quiescent Supply Current
Requires Only Four Small External Capacitors
1.8V to 5.5V Input Voltage Range
0.1µA Logic-Controlled Shutdown
Up to 30mA Output Current
IN
= 1.8V TO 5.5V
PART
0.1 F
0.1 F
1 F
IN
Typical Operating Circuit
SHDN
C2+
C2-
C1+
C1-
)
A
= +25°C.
TEMP. RANGE
-40°C to +85°C
0°C to +70°C
MAX868
Ordering Information
PGND
IN
GND
OUT
FB
Dice*
10 µMAX
PIN-PACKAGE
V
OUT
= 0V TO -2 x V
2.2 F
IN
1

Related parts for MAX868EUB+

MAX868EUB+ Summary of contents

Page 1

... MAX868 C1- 3 PGND 4 C1+ 5 MAX ________________________________________________________________ Maxim Integrated Products For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468. Regulated, Adjustable -2x Inverting Charge Pump ____________________________Features Regulated Negative Output Voltage ( Ultra-Small, 10-Pin µMAX Package On-Demand Switching 450kHz 30µ ...

Page 2

Regulated, Adjustable -2x Inverting Charge Pump ABSOLUTE MAXIMUM RATINGS IN to GND .................................................................-0.3V to +6V OUT to GND ...........................................................+0.3V to -12V IN to OUT.................................................................-0.3V to -17V C1+ to GND ........................................(V IN C1- to GND.............................................................+0.3V to -12V C2+ to GND ....................................................(V ...

Page 3

ELECTRICAL CHARACTERISTICS (V = +3.3V 0.22µ 1µ PARAMETER SYMBOL Supply-Voltage Range V IN Supply Current I IN Shutdown Current I IN,SHDN Oscillator Frequency f OSC Open-Loop Output R OUT Resistance FB ...

Page 4

Regulated, Adjustable -2x Inverting Charge Pump ____________________________Typical Operating Characteristics (continued) (Circuit of Figure +25°C, unless otherwise noted.) A EFFICIENCY vs. LOAD CURRENT ( -7.5V 60 OUT -5V ...

Page 5

PIN NAME 1 GND Analog Ground 2 OUT Charge-Pump Output 3 C1- Negative Terminal of Flying Capacitor C1 4 PGND Power Ground 5 C1+ Positive Terminal of Flying Capacitor C1 6 C2- Negative Terminal of Flying Capacitor ...

Page 6

Regulated, Adjustable -2x Inverting Charge Pump (a) C2+ IN C2- C1+ C1- (b) C1+ C2+ IN GND C2- C1- Figure charge phase, the left-hand switches are closed and the right-hand switches are open, charging the fly- ing ...

Page 7

C V REF OPTIONAL CONNECTION MAX868 IN OUT V IN Figure 4. Setting the Output Voltage Using Two External Resistors Capacitor Selection Choosing the Flying Capacitors Proper choice of the flying capacitors is dependent pri- marily upon ...

Page 8

Regulated, Adjustable -2x Inverting Charge Pump __________Applications Information Low-Output-Voltage Operation Since the difference between the voltage of the series- connected flying capacitors and the output voltage must be dissipated within the device, the MAX868’s efficiency is very similar to that ...

Page 9

COMPONENT PLACEMENT GUIDE 0.5" Figure 7a. Suggested Layout for Circuit of Figure 5 _______________________________________________________________________________________ Regulated, Adjustable -2x Inverting Charge Pump PC BOARD LAYOUT 0.5" Figure 7b. Suggested Layout for Circuit of Figure 5 9 ...

Page 10

Regulated, Adjustable -2x Inverting Charge Pump COMPONENT PLACEMENT GUIDE 0.5" Figure 8a. Suggested Layout for External Reference Applications 10 ______________________________________________________________________________________ PC BOARD LAYOUT 0.5" Figure 8b. Suggested Layout for External Reference Applications ...

Page 11

Regulated, Adjustable -2x Inverting Charge Pump Package Information 11 ...

Page 12

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are 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 © 1998 Maxim Integrated Products NOTES Printed USA is a registered trademark of Maxim Integrated Products ...

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