SP6649 Datasheet, PDF (1/9 Pages) Sipex Corporation – Ultra-low Quiescent Current, High Efficiency Boost DC-DC Regulator

®
SP6649
Ultra-low Quiescent Current,
High Efficiency Boost DC-DC Regulator
FEATURES
■ Ultra-low 12µA Quiescent Current
■ 700mA Output Current at 2.6V_IN, 3.3V_OUT
■ 94% Efficiency Possible
■ Wide Input Voltage Range: 0.85V to 4.5V
■ 3.3V Fixed Output and adjustable 2.5V to
5.0V Output Range
■ Internal Synchronous Rectifier for High
Efficiency
■ 0.3 Charging Switch, 0.3 Synchro-
nous Rectifier
■ Anti-Ringing Inductor Switch
■ Programmable Inductor Peak Current
■ Logic Shutdown Control
■ Under Voltage Lock-Out, 0.62V
■ Programmable Low Battery Detect
■ Small 10 pin MSOP Package
V_BATT ¹
LBI ²
LBON 3
R_LIM 4
SHDN 5
Top View
10 pin MSOP
Tja=113°C/W
10 V_OUT
9 LX
8 P_GND
7 GND
6 FB
APPLICATIONS
■ Digital Still Cameras
■ MP3 Players
■ PDA's
■ Pagers
■ Handheld Portable Devices
■ Medical Monitors
DESCRIPTION
The SP6649 is an ultra-low quiescent current, high efficiency step-up DC-DC converter ideal for
single and dual cell alkaline, or Li-Ion battery applications such as digital still cameras, PDA’s,
MP3 players, and other portable devices. The SP6649 combines the high delivery associated
with PWM control, and the low quiescent current and excellent light-load efficiency of PFM control.
The SP6649 features 12µA quiescent current, synchronous rectification, a 0.3 charging switch,
anti-ringing inductor switch, programmable low battery detect, under-voltage lockout and
programmable inductor peak current. The device can be controlled by a 1nA active LOW
shutdown pin.
VBATT
C1
+
47uF
LBI
LBON
SHDN
RLIM
1.87K
L1 10uH
1 _VBATT
VOUT ¹⁰
2 _LBI SP6649 _LX 9
3 _LBON
PGND ⁸
4
RLIM
7
GND
5
SHDN
6
FB
3.3Vout
C4
1uF
R1
205K
C3
47pF
+ C2
47uF
R2
124K
C1 = C2 = Kemet T49C476K010AS, L1 = Sumida CDRH5D28-100
R1 = 374K for 5V_OUT
Figure 1. Typical Application Circuit
TBD
Figure 2. Maximum Load Current in Operation
Rev:001 Date:11/20/03
SP6649 Ultra-low Quiescent Current, High Efficiency Boost DC-DC Regulator
1
© Copyright 2002 Sipex Corporation