MAX8627 Datasheet, PDF (1/14 Pages) Maxim Integrated Products – Low VBATT, 20uA IQ, 1MHz Synchronous Boost Converter with True Shutdown

19-3995; Rev 0; 3/06
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Low V_BATT, 20µA IQ, 1MHz Synchronous
Boost Converter with True Shutdown
General Description
The MAX8627 step-up converter is a high-efficiency,
low-quiescent current, synchronous boost converter
with True Shutdown™ and inrush current limiting. The
MAX8627 generates 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 MAX8627 is 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
True Shutdown is a trademark of Maxim Integrated Products, Inc.
Typical Operating Circuit
INPUT BATTERY
2.5V TO 4.2V _{C1 C2}
L1
ON
OFF
R4
4, 5
BATT
3
ON
8, 9
LX
6,7
POUT
12
MAX8627
AGND
OUTS
14
13 _ILIM
2
FB
C3 C4
OUTPUT
3V TO 5V
UP TO 1A
R1
R3
R2
1
GND
10, 11
PGND
Features
♦ 1MHz PWM Switching Frequency
♦ True Shutdown Output
♦ Up to 95% Efficiency
♦ 1.0A Guaranteed Output Current
♦ Soft-Start Eliminates Inrush Current
♦ 20µA (typ) Quiescent Current
♦ 0.1µA Logic-Controlled Shutdown
♦ Internal Synchronous Rectifier
♦ Internal Compensation
♦ Adjustable Current Limit
♦ Low-Noise Antiringing Feature
♦ Tiny 14-Pin, 3mm x 3mm, TDFN Package
Ordering Information
PART
PIN-
PACKAGE
PKG
CODE
TOP
MARK
MAX8627ETD+ ^{14 TDFN-EP*}
3mm x 3mm
T1433-2
AAQ
Note: The device operates in the -40°C to +85°C extended oper-
ating temperature range.
*EP = Exposed pad.
+Denotes lead-free package.
Pin Configuration
TOP VIEW
14 13 12 11 10 9 8
MAX8627ETD+
+
1234567
TDFN 3mm x 3mm
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.