MAX719CSE ,PALMTOP COMPUTER AND FLASH MEMORY POWER SUPPLY REGULATORSGeneral Description
The MAX717-MAX721 CMOS power-supply ICs create
dual, regulated DC outputs f ..
MAX720CSE ,PALMTOP COMPUTER AND FLASH MEMORY POWER SUPPLY REGULATORSApplications
Palmtop Computers
Flash-Memory/PCMCIA Power Supplies
Portable Data-Collection Equip ..
MAX720CSE ,PALMTOP COMPUTER AND FLASH MEMORY POWER SUPPLY REGULATORSGeneral Description
The MAX717-MAX721 CMOS power-supply ICs create
dual, regulated DC outputs f ..
MAX720CSE ,PALMTOP COMPUTER AND FLASH MEMORY POWER SUPPLY REGULATORSFeatures
. Low 0.9V to 5.5V Battery Operating Range
. Unregulated 7V to 20V DC Input Range
. ..
MAX7219 ,Serially Interfaced, 8-Digit, LED Display DriversApplicationsMAX7219EWG -40°C to +85°C 24 Wide SOBar-Graph Displays Panel MetersMAX7219ERG -40°C to ..
MAX7219CNG ,Serially Interfaced / 8-Digit LED Display DriversGeneral Description ________
MB47358 ,DUAL OPERATIONAL AMPLIFIERFUJITSU SEMICONDUCTORDS04-11104-3EDATA SHEETLINEAR ICDUAL OPERATIONAL AMPLIFIERMB47358DUAL OPERATIO ..
MB47393 ,DUAL COMPARATORFUJITSU SEMICONDUCTORDS04-12103-4EDATA SHEETASSPDUAL COMPARATORMB47393n DESCRIPTIONThe Fujitsu MB47 ..
MB47393P ,Dual comparatorFUJITSU SEMICONDUCTORDS04-12103-4EDATA SHEETASSPDUAL COMPARATORMB47393n DESCRIPTIONThe Fujitsu MB47 ..
MB47393P ,Dual comparatorFUJITSU SEMICONDUCTORDS04-12103-4EDATA SHEETASSPDUAL COMPARATORMB47393n DESCRIPTIONThe Fujitsu MB47 ..
MB47393PF ,Dual comparatorFUJITSU SEMICONDUCTORDS04-12103-4EDATA SHEETASSPDUAL COMPARATORMB47393n DESCRIPTIONThe Fujitsu MB47 ..
MB4752A ,SUBSCRIBER LINE INTERFACE IC" mm;
gr T$544-A874
'j?itl,'l,lllill,ililill MB4752A April 1987
'llllllllllllllllllllllllill ..
MAX717CSE-MAX717ESE-MAX718CSE-MAX718ESE-MAX719CSE-MAX720CSE-MAX721CSE-MAX721ESE
PALMTOP COMPUTER AND FLASH MEMORY POWER SUPPLY REGULATORS
19-0049; Rev tt 10/92
2AlAlAl2ClLAlAl
Palmtop Computer and
Flash Memory Power-Supply Regulators
General Description
The MAX717-MAX721 CMOS power-supply Cs create
dual, regulated DC outputs for small, battery-operated
microprocessor systems. Each device generates a main
output (3V or 5V, selectable) and an auxiliary output for flash
memory or PCMCIA (5V or 12V, selectable). Each device
accepts up to three input voltages. Power can come from
a main battery (two or three alkaline or NiCad cells), a
lithium backup battery, or an unregulated DC source such
as an AC-DC wall adapter.
The MAX717-MAX721 provide three improvements over
prior-art devices. Physical size is reduced -the high switch-
ing frequencies (up toO.5MHz) made possible by MOSFET
power transistors allow for tiny (<5mm diameter) surface-
mount magnetics. Efficiency is improved to 87% (10%
better than with low-voltage regulators made in bipolar
technology). And supply current is reduced to' 60PA by
CMOS construction and a unique constant-off-tima pulse-
frequency modulation (PFM) control scheme,
The MAX717-MAX721 differ only in shutdown and status
functions and in the choice of a 3.0V or 3.3V main output
(see Device Options).
For LCD-bias applications requiring an adjustable nega-
tive voltage, refer to the MAX722/MAX723 data sheet.
Applications
Palmtop Computers
Flash-Memory/PCMCIA Power Supplies
Portable Data-Collection Equipment
Medical Instrumentation
Portable Data Communicators
Pin Configurations
TOPVIEW
BKUF [I . E V+
120N E E m
3mm) E "leg" E GND
12/5 MAX718 LIN
E W779 E]
VREF E E 012
AGND [E E CSI
ma E E] F812
F83 cr El W
( ) AREFORMAX717.
MAX7m/MAX721 on last page
Features
. Low 0.9V to 5.5V Battery Operating Range
t Unregulated 7V to 20V DC Input Range
t Dual R ulatod Outputs
Main Input: 3.3V/5V
Auxlllary Output: 5V/12V
. 87% Emelentry at 200mA
. Efficiency PRAM Koep-Allve: 80% at 1mA
t 8W/ln3 Power Density
" 60PA Quiescent Current
t 20 Shutdown Mode with VREF Allve
MAX720/MAX721 only)
. 500m: Maxlmum Swltchlng Frequency
t $1.596 VREF Tolerance Over Temp
t Detect Output Power Failure:
. Detect Ptesenoe of AC Power
. 16-Pln Narrow SO Packages
Ordering Information
PART TEMP. RANGE AN-PACKAGE
MAX717CSE O'C to +70'C 16 Narrow SO
MAX717C/D JC to +700 Dice'
Ordering lntonilallon contlnuod on last page.
. Contact factory for dice specifications.
Typical Operating tttrxttgn
Atll/i-
MAIN I 22”"
OUTPUT .. F33 D12
1: .. m 1
T 0512
LITquM I MAX717
= an F312
7 / t_, comm
INPUTS
LIN (4)
'sq----
OUTPUTS
UngIEgoUULRAgED VREF V+ tmo (2)
(WALLADAPTEH) t J”:
Maxim Integrated Products
11939 AEIILLZL '1 fl-lWW
MAX 711 7- 7211/1597 Kit
Palmtop Computer and
[Flash Memory Power-supply Regulators
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V+ to GND) ................... +7V, -0.3V
Switch Voltage (LX3 to GND) ................... +7V, -0.31/
Linear-Regulator Voltage (LIN to GND) .......... +20V, -0.3V
Feedback Voltage (F812 to GND) .............. +13V, -0.3V
Auxiliary PirLVoltgges
t1i_ON,ati,18/5,SHDN,LXB,BKUP, VREF,
PFO, DCIN, CS12, D1210 GND) ....... -0. 3V to (V+ + o, 3V)
Ground Voltage Difference (AGND to GND) ........... 103
Reference Current (IVREF) ........................ 2. 5mA
Stresses be
Continuous Power Dissipation
up to +70''C ................................. 696mW
derate above +70°C ....P_._l..l.l- 8.70mWI' C
Operating Temperature Ranges:
MAX7__ E ..__rr_r.__._.r__...r_..__. O'C to +70''C
MAX7_ _ESE .......................... -40'C to +85''C
Junction Temperature .____rr....___w..wF.qF_._. +150''C
Storage Temperature Range .............. -65'C to +160°C
Lead Temperature (soldering, 10 sec) ............ .' . +300'C
d those listed under 'Absoluie Maximum Ratings' may cause permanent damage to the device. These are stress [stings only, and functional
operation a the device at these or any other conditions beyond those indicated in the operational seclions of the specifications is not implied Exposure to
absolute maximum rating conditions for amended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, VBATT1 = VBATT2 = 2.5V. TA = TMIN to nod,' unless otherwise noted.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
2V < VBATT1 < 3V, 3,5 3V MAX717/718/720 3.17 3.30 3.43
Main Output Voltage - OmA < ILOAo < 200mA, =
Main SMPS Mode DC SOURCE = BKUP = ov _ MAX719/MAX721 2,88 3.00 &12 V
(Note 1) 3/5 = ov 4.80 5.00 5.20
Main Out tVolta 7V < DC SOURCE < 18V, 35 = 3V MAX717/718/720 3.17 3.30 3.43
. pu iiig OmA < ILOAD < 500mA. MAX719/MAX721 2.88 3.00 3.12 V
Linear-Regulator ode BKUP = 0V -
3/5 = 0V 4.80 5.00 5.20
Main Output Voltage - Ke/k-dl-ii' 3=v3V, MAX717IMAX718 3.17 3.30 3.43 V
Backup Mode OmA < ILOAD < i/rip MAX719 2.88 3.00 3.12
... 2V < VBATT2 < 4V 12/5 = ov 4.80 5.00 5.20
A la Out tVoltaae ' - V
UXlll ry u pu g VBATTI = 2.5V, 'LOAD = 0mA 12/5 = 3V 11.54 12.00 12.48
Minimum Start-Up Supply -
Voltage (VBATT1) (LOAD - OmA 1.4 1.8 v
Minimum Start-Up Supply
Voltage (DCIN) 7.3 7.6 V
Current-Sense Limit - _
Threshold Measured at C812. 3/5 - 3V 170 200 230 mV
Drive Output Current Measured at D12, 3/5 = 3V i150 mA
Linear-Re ulatorOutput - - -
Sink 0mm“ LIN - 6v. 3/5 _ 3v, measured at LIN 20 so mA
Quiescent Supply Current 120N = ov, 3/5 = 3V, BKUP = 0V or 3V, F83 forced to 3.47V 60
from 3VOUT (Note 2) (MAX717/718/720). F63 forced to 3.15V (MAX719/MAX721) “A
Battery Quiescent Current _ - - -
(VBATT1 + VBATT2) 12ON - OV, 315 - 3V, BKUP - 0V or av 60 pA
Shutdown Battery Current MAX720/MAX721, SHDN = ov 20 40 pA
Battery Quiescent Current - - - _
Linear-RegulaiorMode DC source - TV, 3/5 - OV, measured at VBATTI -10 10 pA
Backup-Battery Quiescent - _ - _
Current - Backup Mod e flfgtggv= OV, BKUP - 3V, 3/5 - 3V, measured at VBATT3, 70 "A
Backup-Battery Current - DC source = 0V, BKUP = OV, 3/5 = OV, measured at VBATTS. -l 1 mA
Main Mode forced to 3V
2 MAXIM
