MAX8627ETD+-MAX8627ETD+T Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX8627ETD+-MAX8627ETD+T
Low VBATT, 20µA IQ, 1MHz Synchronous Boost Converter with True Shutdown
MAX8627
Low VBATT, 20µA IQ, 1MHz Synchronous
Boost Converter with True Shutdown
EVALUATION KIT AVAILABLE
General Description
The MAX8627step-up converter is a high-efficiency,
low-quiescent current, synchronous boost converter
with True Shutdown™ and inrush current limiting. The
MAX8627generates any boosted output voltage from
3V to 5V from either a 2-cell NiMH/NiCd or a single-cell
Li+/Li polymer battery.
Quiescent current is only 20µA (typ), and at light loads
the converter pulses only as needed for best efficiency.
At higher loads, PWM mode maintains fixed 1MHz
operation for lowest noise and ripple.
The MAX8627 includes an internal soft-start to limit
inrush current to a maximum of 500mA. Additional fea-
tures include True Shutdown, internal compensation,
and adjustable current limit. The MAX8627is available
in a tiny 3mm x 3mm TDFN package and is ideal for
use in handheld devices such as DSCs, PDAs, and
smartphones.
Applications
DSC Motors and Backup Power
Microprocessor/DSP Core Power
Cellphones, PDAs, MP3 Players
Portable Handheld Devices
Features1MHz PWM Switching FrequencyTrue Shutdown OutputUp to 95% Efficiency1.0A Guaranteed Output CurrentSoft-Start Eliminates Inrush Current20µA (typ) Quiescent Current0.1µA Logic-Controlled ShutdownInternal Synchronous RectifierInternal CompensationAdjustable Current LimitLow-Noise Antiringing FeatureTiny 14-Pin, 3mm x 3mm, TDFN Package
MAX8627ETD+
TOP VIEW51110
ILIMPGPG
BATTBATT
OUTS
GND
AGND
POUT
POUT
Pin Configuration
Ordering Information
Note:The device operates in the -40°C to +85°C extended oper-
ating temperature range.
*EP= Exposed pad.
+Denotes lead-free package.
PARTPIN-
PACKAGE
PKG
CODE
TOP
MARK
MAX8627ETD+14 TDFN-EP*
3mm x 3mmT1433-2AAQ
True Shutdown is a trademark of Maxim Integrated Products, Inc.
MAX8627
BATT
ILIM
GND
POUT
OUTS
INPUT BATTERY
2.5V TO 4.2V
OUTPUT
3V TO 5V
UP TO 1AONR3
OFF
4, 5
AGND122
PGND10, 11
6,7
8, 9
Typical Operating Circuit
Visit www.maximintegrated.com/products/patentsfor
product patent marking information.
MAX8627
Low VBATT, 20µA IQ, 1MHz Synchronous
Boost Converter with True Shutdown
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VOUTS= VPOUT= 5V, VON= VBATT= 3.6V, VILIM= GND, TA= -40°C to +85°C, typical values are at TA = +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 (VOUTS+ 0.3V) and (VBATT+ 0.3V)
Continuous Power Dissipation (TA= +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
PARAMETERCONDITIONSMINTYPMAXUNITS
GENERAL
Operating Input Voltage Range(Note 1)0.95.5V
Minimum Startup VoltageNo load (Note 1)1.21.5V
Maximum Startup Current Limit0.5A
TA = +25°C0.11Shutdown, ON = GNDTA = +85°C0.2
TA = 0°C to +85°C2030No load, no switchingTA = -40°C (Note 2)2035
Supply Current
No load, switching20
OSCILLATOR
Switching Frequency0.951.01.05MHz
Startup Switching Frequency2.0MHz
Maximum Duty Cycle82.587.0%
Output Voltage Adjust Range3.05.2V
FB Regulation VoltageNo load1.0051.0151.025V
FB Load Regulation0A to 1A output current load step-30mV/A
FB Line RegulationVBATT = 2.7V to 3V, output current = 0.5A+20mV
TA = +25°C-50-10+50FB Input Leakage CurrentVFB = 1.2V,
VOUTS = VPOUT = VBATT = 5.5VTA = +85°C-10nA
Low level0.25ILIM Dual Mode™ ThresholdHigh level0.45V
Idle Mode Trip Level(Note 3)50mA
DC-DC SWITCHES
n-Channel On-Resistance0.150.25Ω
p-Channel On-Resistance0.150.25Ω
Damping Switch On-Resistance1730Ω
VILIM = 0V3.23.53.7n-Channel Current limitVILIM = 0.6V1.0A
Note 1:LX has internal clamp diodes to the IC internal power node VPWR(where VPWRis 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.
MAX8627
Low VBATT, 20µA IQ, 1MHz Synchronous
Boost Converter with True Shutdown
ELECTRICAL CHARACTERISTICS (continued)
(VOUTS= VPOUT= 5V, VON= VBATT= 3.6V, VILIM= GND, TA= -40°C to +85°C, typical values are at TA = +25°C, unless otherwise
noted.)
PARAMETERCONDITIONSMINTYPMAXUNITS
p-Channel Turn-Off Current10mA
TA = +25°C0.11POUT Leakage CurrentVLX = 0V, VPOUT = VBATT = 5.5VTA = +85°C0.2µA
TA = +25°C0.11LX Leakage CurrentVLX = 0V and VPOUT = 5.5V or VLX =
5.5V and VOUTS = VPOUT = 0VTA = +85°C0.2µA
Soft-Start IntervalOutput current = 0.5A5.25ms
Overload Protection Fault Delay65ms
LOGIC INPUTS
1.5V < VPOUT = VOUTS = VBATT ≤ 1.8V0.2ON Input Low Level1.8V < VPOUT = VOUTS = VBATT ≤ 5.5V0.5V
1.5V < VPOUT = VOUTS = VBATT ≤ 1.8VVPOUT -
0.2ON Input High Level
1.8V < VPOUT = VOUTS + VBATT ≤ 5.5V1.6
TA = +25°C0.011ON, Input Leakage CurrentVOUTS = VPOUT = VBATT = 5.5V,
ON = 0V or ON = 5.5VTA = +85°C0.02µA
Thermal Shutdown+160°C
Note 1:The MAX8627 is powered from OUTS. Once started, the IC operates down to 0.9V.
Note 2:Specifications to -40°C are guaranteed by design and not production tested.
Note 3:The idle-mode current threshold is the transition point between fixed-frequency PWM operation and idle-mode operation.
The specification is given in terms of output load current for an inductor value of 1µH. For a step-up converter, the idle-
mode transition varies with the input-to-output voltage ratio.
MAX8627
Low VBATT, 20µA IQ, 1MHz Synchronous Boost Converter with True Shutdown
EFFICIENCY vs. LOAD CURRENT
WITH 3.3V OUTPUT
MAX8627 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
VBATT = 3.0V
VBATT = 1.5V
VBATT = 1.8V
VBATT = 2.4V
EFFICIENCY vs. LOAD CURRENT
WITH 5V OUTPUT
MAX8627 toc02
LOAD CURRENT (mA)
EFFICIENCY (%)
VBATT = 4.2V
VBATT = 1.8V
VBATT = 2.4V
VBATT = 3.0V
VBATT = 3.6V
MAXIMUM LOAD CURRENT
vs. INPUT VOLTAGE
MAX8627 toc03
INPUT VOLTAGE (V)
MAXIMUM LOAD CURRENT (A)
VPOUT = 3.3V
VPOUT = 5V
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX8627 toc04
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
VBATT = 4.2V
VBATT = 1.8V
VBATT = 2.4V
VBATT = 3.0V
VBATT = 3.6V
NO-LOAD INPUT CURRENT
vs. INPUT VOLTAGE WITH 3.3V OUTPUT
MAX8627 toc05
INPUT VOLTAGE (V)
INPUT CURRENT (
TA = +25°C
TA = +85°C
TA = 40°C
R1 = 1.15MΩ, R2 = 499kΩ
OUTPUT ONLY LOADED WITH THE FB
RESISTOR-DIVIDER NETWORK.
NO-LOAD INPUT CURRENT
vs. INPUT VOLTAGE WITH 5V OUTPUT
MAX8627 toc06
INPUT VOLTAGE (V)
INPUT CURRENT (32
TA = +25°C
TA = +85°C
TA = 40°C
R1 = 2MΩ, R2 = 499kΩ
OUTPUT ONLY LOADED WITH THE FB
RESISTOR-DIVIDER NETWORK.
SHUTDOWN CURRENT
vs. INPUT VOLTAGE
MAX8627 toc07
INPUT VOLTAGE (V)
SHUTDOWN CURRENT (nA)
TA = +25°C
TA = +85°C
TA = 40°C
STARTUP VOLTAGE vs. LOAD CURRENT
WITH 5V OUTPUT
MAX8627 toc08
LOAD CURRENT (mA)
STARTUP VOLTAGE (V)
TA = +25°C
TA = +85°C
TA = 40°C
SOFT-START TIME vs. LOAD CURRENT
MAX8627 toc09
LOAD CURRENT (A)
SOFT-START TIME (ms)
Typical Operating Characteristics
(Circuit of Figure 1, VOUTS= VPOUT= 5V, VON= VBATT= 3.6V, TA= +25°C, unless otherwise noted.)
MAX8627
Low VBATT, 20µA IQ, 1MHz Synchronous
Boost Converter with True Shutdown
SOFT-START TIME vs. INPUT VOLTAGE
MAX8627 toc10
INPUT VOLTAGE (V)
SOFT-START TIME (ms)
PEAK INDUCTOR CURRENT vs. VILIM
MAX8627 toc11
VILIM (V)
PEAK INDUCTOR CURRENT (A)
HEAVY LOAD SWITCHING WAVEFORMS
MAX8627 toc12
1µs/div
VLX
ILI
VPOUT100mV/div
(AC-COUPLED)
2V/div
1A/div
LIGHT-LOAD SWITCHING WAVEFORMS
MAX8627 toc13
40µs/div
VLX
ILI
VPOUT
100mV/div
(AC-COUPLED)
2V/div
1A/div
LOAD TRANSIENT RESPONSE
MAX8627 toc14
20µs/div
ILOAD
VPOUT100mV/div
(AC-COUPLED)
500mA/div
LINE TRANSIENT RESPONSE
MAX8627 toc15
100µs/div
VPOUT
VBATT
2V/div
100mV/div
(AC-COUPLED)
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VOUTS= VPOUT= 5V, VON= VBATT= 3.6V, TA= +25°C, unless otherwise noted.)
MAX8627
Low VBATT, 20µA IQ, 1MHz Synchronous
Boost Converter with True Shutdown
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VOUTS= VPOUT= 5V, VON= VBATT= 3.6V, TA= +25°C, unless otherwise noted.)
STARTUP WAVEFORMS WITH NO LOAD
MAX8627 toc16
400µs/div
VPOUT
ILX
VON2V/div
500mV/div
2V/div
STARTUP WAVEFORMS WITH 100mA LOAD
MAX8627 toc17
400µs/div
VPOUT
ILX
VON2V/div
500mV/div
2V/div
BODE PLOT WITH 2 x 22µF CERAMIC
OUTPUT CAPACITORS, 500mA LOAD
MAX8627 toc19
FREQUENCY (Hz)
GAIN (dB)
PHASE (DEG)10k100k1M
GAIN
PHASE7dB GAIN
MARGIN
48-DEG PHASE MARGIN
94kHz
SWITCHING FREQUENCY vs. TEMPERATURE
MAX8627 toc18
TEMPERATURE (°C)
SWITCHING FREQUENCY (kHz)6010-15
BODE PLOT WITH 2 x 47µF TANTALUM OUTPUT
CAPACITORS (130mΩ ESR), 500mA LOAD
MAX8627 toc20
GAIN (dB)
PHASE (DEG)10k100k1M
GAIN
PHASE13dB GAIN MARGIN
125 - DEG PHASE MARGIN
27kHz
Pin Description
PINNAMEFUNCTIONGNDAnalog Ground. Connect to PG and AGND.
2FBVoltage Feedback Input. Connect FB to the center of an external feedback network between OUTS
and GND (see the Setting the Output Voltage section). FB regulates to 1.015V (typ).
3ONActive-High Enable Input. Connect ON to BATT or logic high for normal operation. Connect ON to
GND or logic low for True Shutdown mode.
4, 5BATTSupply Voltage Input. Connect to the battery or a supply from 1.5V to 5.5V. Connect two 22µF
ceramic capacitors from BATT to PG.
6, 7POUTPower Output. Connect two 22µF ceramic capacitors from POUT to PG (see the Capacitor Selection
section).
8, 9LXInductor Connection. LX is high impedance in shutdown.
10, 11PGPower Ground. Connect to GND and AGND.AGNDAnalog Ground. Connect to GND and PG.ILIM
n-Channel Current-Limit Control. For the maximum current limit of 3.5A, connect ILIM to GND. For
lower current-limit settings, connect ILIM to a resistor-divider from POUT to GND (see the Setting the
Current Limit section).OUTSIC Power Input. Supplied from the output. Connect OUTS to POUT.
—EPExposed Pad. Connect EP to GND. This does not remove the requirement for a proper ground
connection to GND.
MAX8627
Low VBATT, 20µA IQ, 1MHz Synchronous
Boost Converter with True Shutdown

Partno	Mfg	Dc	Qty	Available	Descript
MAX8627ETD+ \|MAX8627ETD	MAXIM	N/a	150	avai	Low VBATT, 20µA IQ, 1MHz Synchronous Boost Converter with True Shutdown
MAX8627ETD+T	MAXIM	N/a	1402	avai	Low VBATT, 20µA IQ, 1MHz Synchronous Boost Converter with True Shutdown