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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1706 Datasheet

1- to 3-Cell / High-Current / Low-Noise / Step-Up DC-DC Converters with Linear Regulator

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19-1198; Rev 0; 4/97
EVALUAATVIOANILKAIBTLMEANUAL 1- to 3-Cell, High-Current, Low-Noise,
Step-Up DC-DC Converters with Linear Regulator
_______________General Description
The MAX1705/MAX1706 are high-efficiency, low-noise,
step-up DC-DC converters with an auxiliary linear-
regulator output. These devices are intended for use in
battery-powered wireless applications. They use a syn-
chronous rectifier pulse-width-modulation (PWM) boost
topology to generate 2.5V to 5.5V outputs from battery
inputs, such as 1 to 3 NiCd/NiMH cells or 1 Li-Ion cell.
The MAX1705 has an internal 1A N-channel MOSFET
switch. The MAX1706 has a 0.5A switch. Both devices
also have a built-in low-dropout linear regulator that
delivers up to 200mA.
With an internal synchronous rectifier, the MAX1705/
MAX1706 deliver 5% better efficiency than similar non-
synchronous converters. They also feature a pulse-
frequency-modulation (PFM) standby mode to improve
efficiency at light loads, and a 1µA shutdown mode. An
efficiency-enhancing track mode reduces the step-up
DC-DC converter output to 300mV above the linear-reg-
ulator output.
Both devices come in a 16-pin QSOP package, which
occupies the same space as an 8-pin SO. Other features
include two shutdown-control inputs for push-on/push-off
control, and an uncommitted comparator for use as a volt-
age monitor.
________________________Applications
Digital Cordless Phones
Personal Communicators
Palmtop Computers
Hand-Held Instruments
PCS Phones
Wireless Handsets
Two-Way Pagers
__________________Pin Configuration
TOP VIEW
LBP 1
LBN 2
REF 3
TRACK 4
GND 5
OUT 6
FB 7
FBLDO 8
MAX1705
MAX1706
QSOP
16 POUT
15 ONA
14 ONB
13 LX
12 PGND
11 CLK/SEL
10 LBO
9 LDO
____________________________Features
o Up to 96% Efficiency
o 1.1VIN Guaranteed Start-Up
o Up to 850mA Output (MAX1705)
o Step-Up Output (2.5V to 5.5V adjustable)
o Linear Regulator (1.25V to 5.0V adjustable)
o PWM/PFM Synchronous-Rectified Topology
o 300kHz PWM Mode or Synchronizable
o 1µA Shutdown Mode
o Voltage Monitor
o Pushbutton On/Off Control
______________Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
MAX1705C/D
0°C to +70°C
Dice*
MAX1705EEE
-40°C to +85°C
16 QSOP
MAX1706C/D
0°C to +70°C
Dice*
MAX1706EEE
-40°C to +85°C
16 QSOP
*Dice are tested at TA = +25°C, DC parameters only.
__________Typical Operating Circuit
INPUT 0.7V TO 5.5V
LOW-BATTERY
DETECTION
ON/OFF CONTROL
HIGH
EFFICIENCY
LOW
NOISE
LX
LBP
POUT
OUT
MAX1705 FB
LBO MAX1706
ONA
ONB
CLK/SEL
TRACK
LBN
LDO
FBLDO
REF GND PGND
STEP-UP OUTPUT
LINEAR
REGULATOR
OUTPUT
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1706 Datasheet

1- to 3-Cell / High-Current / Low-Noise / Step-Up DC-DC Converters with Linear Regulator

No Preview Available !

1- to 3-Cell, High-Current, Low-Noise,
Step-Up DC-DC Converters with Linear Regulator
ABSOLUTE MAXIMUM RATINGS
ONA, ONB, FBLDO, OUT, POUT to GND...................-0.3V to 6V
PGND to GND.....................................................................±0.3V
POUT to OUT ......................................................................±0.3V
LX to PGND ............................................-0.3V to (VPOUT + 0.3V)
CLK/SEL, REF, FB, TRACK, LDO,
LBN, LBP, LBO to GND.......................-0.3V to (VOUT + 0.3V)
LDO Short Circuit .......................................................Continuous
Continuous Power Dissipation (TA = +70°C)
QSOP (derate 8.70mW/°C above +70°C) ...................696mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
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.
ELECTRICAL CHARACTERISTICS
(VOUT = VPOUT = VLBP = 3.6V, CLK/SEL = FB = LBN = LBO = ONA = ONB = TRACK = GND, REF = open (bypassed with 0.22µF),
LX = open, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
DC-DC CONVERTER
Minimum Start-Up Voltage
Minimum Operating Battery
Voltage
SYMBOL
CONDITIONS
TA = +25°C, ILOAD < 1mA, Figure 2
(Note 1)
MIN TYP MAX UNITS
0.9 1.1
0.7
V
V
FB Regulation Voltage
FB Input Current
OUT Adjust Range
Load Regulation
CLK/SEL = OUT
VFB = 1.5V
MAX1705, 0A ILX 0.5A;
MAX1706, 0A ILX 0.25A;
CLK/SEL = OUT
1.219
2.5
1.233
0.01
1.247
50
5.5
0.65 1.25
V
nA
V
%
OUT Voltage in Track Mode
TRACK = VLDO > 2.3V
VLDO
+ 0.2
VLDO
+ 0.3
VLDO
+ 0.4
V
Frequency in Start-Up Mode
Start-Up to Normal Mode
Transition Voltage
Supply Current in Shutdown
fLX
IOUT
VPOUT = VOUT = 1.5V
(Note 2)
ONA = GND, ONB = OUT, measure IOUT
40 150 300 kHz
2.00 2.15 2.30
V
1 20 µA
Supply Current in
Low-Power Mode
IOUT
CLK/SEL = GND, VFB = VFBLDO = 1.5V,
no load
100 190 µA
Supply Current in
Low-Noise Mode
REFERENCE
Reference Output Voltage
Reference Load Regulation
Reference Supply Regulation
IOUT
VFB = VFBLDO = 1.5V, no load
CLK/SEL = OUT
FB = GND (LX switching)
180 360 µA
2.1 mA
IREF = 0µA
-1µA < IREF < 50µA
2.5V < VOUT < 5.5V
1.238
1.250
4
0.2
1.262
15
5
V
mV
mV
2 _______________________________________________________________________________________


Part Number MAX1706
Description 1- to 3-Cell / High-Current / Low-Noise / Step-Up DC-DC Converters with Linear Regulator
Maker Maxim
Total Page 20 Pages
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