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MAX669EUB-

Description
Real Time Clock Integrated RTC/TCXO/Crystal
Categorysemiconductor    Power management   
File Size2MB,18 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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MAX669EUB- Overview

Real Time Clock Integrated RTC/TCXO/Crystal

MAX669EUB- Parametric

Parameter NameAttribute value
Product CategorySwitching Controllers
ManufacturerMaxim
RoHSDetails
TopologyBoost, Flyback
Number of Outputs1 Output
Switching Frequency500 kHz
Duty Cycle - Max94 %
Output Voltage3 V to 28 V
Output Current6 A
Minimum Operating Temperature- 40 C
Maximum Operating Temperature+ 85 C
Mounting StyleSMD/SMT
Package / CaseUMAX-10
PackagingTube
Operating Supply Current0.22 mA
Operating Supply Voltage1.8 V to 28 V
Factory Pack Quantity50
TypeCurrent Mode PWM Controllers
MAX668/MAX669
General Description
1.8V to 28V Input, PWM Step-Up
Controllers in μMAX
Benefits and Features
1.8V Minimum Start-Up Voltage (MAX669)
Wide Input Voltage Range (1.8V to 28V)
● Tiny 10-Pin μMAX Package
Current-Mode PWM and Idle Mode™ Operation
Efficiency over 90%
● Adjustable 100kHz to 500kHz Oscillator or
SYNC Input
● 220μA Quiescent Current
Logic-Level Shutdown
Soft-Start
The MAX668/MAX669 constant-frequency, pulse-width-
modulating (PWM), current-mode DC-DC controllers are
designed for a wide range of DC-DC conversion applications
including step-up, SEPIC, flyback, and isolated-output
configurations. Power levels of 20W or more can be
controlled with conversion efficiencies of over 90%. The
1.8V to 28V input voltage range supports a wide range of
battery and AC-powered inputs. An advanced BiCMOS
design features low operating current (220μA), adjustable
operating frequency (100kHz to 500kHz), soft-start, and
a SYNC input allowing the MAX668/MAX669 oscillator to
be locked to an external clock.
DC-DC conversion efficiency is optimized with a low
100mV current-sense voltage as well as with Maxim’s
proprietary Idle Mode™ control scheme. The controller
operates in PWM mode at medium and heavy loads for
lowest noise and optimum efficiency, then pulses only as
needed (with reduced inductor current) to reduce operating
current and maximize efficiency under light loads. A logic-
level shutdown input is also included, reducing supply
current to 3.5μA.
The MAX669, optimized for low input voltages with a
guaranteed start-up voltage of 1.8V, requires bootstrapped
operation (IC powered from boosted output). It supports
output voltages up to 28V. The MAX668 operates with
inputs as low as 3V and can be connected in either a boot-
strapped or non-bootstrapped (IC powered from input sup-
ply or other source) configuration. When not bootstrapped,
it has no restriction on output voltage. Both ICs are avail-
able in an extremely compact 10-pin μMAX package.
Applications
Cellular Telephones
Telecom Hardware
LANs and Network Systems
POS Systems
Ordering Information
PART
MAX668EUB
MAX669EUB
MAX669EUB/V+T
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
10 µMAX
10 µMAX
10 µMAX
Idle Mode is a trademark of Maxim Integrated Products.
+ Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
/V Denotes an automotive qualified part.
Note:
Devices are also available in a lead(Pb)-free/RoHS-
compliant package. Specify lead-free by adding “+” to the part
number when ordering.
Typical Operating Circuit
V
IN
= 1.8V to 28V
Pin Configuration
TOP VIEW
SYNC/
SHDN
FREQ
V
CC
V
OUT
= 28V
EXT
CS+
LDO 1
FREQ
GND
REF
FB
2
3
4
5
10 SYNC/SHDN
MAX669
LDO
PGND
FB
GND
MAX668
MAX669
9
8
7
6
V
CC
EXT
PGND
CS+
REF
µMAX
19-4778; Rev 3; 6/16

MAX669EUB- Related Products

MAX669EUB- MAX669EUB-V-T
Description Real Time Clock Integrated RTC/TCXO/Crystal Switching Controllers 1.8V to 28V Step-Up
Product Category Switching Controllers Switching Controllers
Manufacturer Maxim Maxim
RoHS Details Details
Number of Outputs 1 Output 1 Output
Duty Cycle - Max 94 % 94 %
Output Voltage 3 V to 28 V 3 V to 28 V
Minimum Operating Temperature - 40 C - 40 C
Maximum Operating Temperature + 85 C + 85 C
Mounting Style SMD/SMT SMD/SMT
Package / Case UMAX-10 UMAX-10
Packaging Tube Reel
Operating Supply Current 0.22 mA 0.22 mA
Operating Supply Voltage 1.8 V to 28 V 1.8 V to 28 V
Factory Pack Quantity 50 2500
Type Current Mode PWM Controllers Current Mode PWM Controllers
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