Datasheet

MAX8627
Low V
BATT
, 20µA IQ, 1MHz Synchronous
Boost Converter with True Shutdown
2
Maxim Integrated
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
OUTS
= V
POUT
= 5V, V
ON
= V
BATT
= 3.6V, V
ILIM
= GND, T
A
= -40°C to +85°C, typical values are at T
A
= +25°C, unless otherwise
noted.)
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.
OUTS, BATT to GND ................................................-0.3V to +6V
LX Current (Note 1) ...............................................................3.5A
AGND, PG to GND ................................................-0.3V to +0.3V
POUT to OUTS ......................................................-0.3V to +0.3V
FB, ILIM, ON to
GND.....0.3V to the higher of (V
OUTS
+ 0.3V) and (V
BATT
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
14-Pin TDFN 3mm x 3mm
(derate 18.2mW/°C above +70°C).............................1454mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
GENERAL
Operating Input Voltage Range (Note 1) 0.9 5.5 V
Minimum Startup Voltage No load (Note 1) 1.2 1.5 V
Maximum Startup Current Limit 0.5 A
T
A
= +25°C 0.1 1
Shutdown, ON = GND
T
A
= +85°C 0.2
T
A
= 0°C to +85°C2030
No load, no switching
T
A
= -40°C (Note 2) 20 35
Supply Current
No load, switching 20
µA
OSCILLATOR
Switching Frequency 0.95 1.0 1.05 MHz
Startup Switching Frequency 2.0 MHz
Maximum Duty Cycle 82.5 87.0 %
Output Voltage Adjust Range 3.0 5.2 V
FB Regulation Voltage No load 1.005 1.015 1.025 V
FB Load Regulation 0A to 1A output current load step -30 mV/A
FB Line Regulation V
BATT
= 2.7V to 3V, output current = 0.5A +20 mV
T
A
= +25°C -50 -10 +50
FB Input Leakage Current
V
FB
= 1.2V,
V
OUTS
= V
POUT
= V
BATT
= 5.5V
T
A
= +85°C -10
nA
Low level 0.25
ILIM Dual Mode™ Threshold
High level 0.45
V
Idle Mode Trip Level (Note 3) 50 mA
DC-DC SWITCHES
n-Channel On-Resistance 0.15 0.25 Ω
p-Channel On-Resistance 0.15 0.25 Ω
Damping Switch On-Resistance 17 30 Ω
V
ILIM
= 0V 3.2 3.5 3.7
n-Channel Current limit
V
ILIM
= 0.6V 1.0
A
Dual Mode is a trademark of Maxim Integrated Products, Inc.
Note 1: LX has internal clamp diodes to the IC internal power node V
PWR
(where V
PWR
is the higher of BATT or POUT) and PG.
Applications that forward bias these diodes should take care not to exceed the device’s power-dissipation limits.