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参数资料
| 型号： | SP6648LEDEB |
| 厂商： | Exar Corporation |
| 文件页数： | 4/16页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR SP6648LED |
| 标准包装： | 1 |
| 系列： | * |
FUNCTIONAL DIAGRAM
V BATT
QKILL
charge end
LX
INTERNAL
V BATT
V O
V BATT
Min
T OFF
IUC
undercurrent
comparator
SHDN
SDI
0.61V
-
+
c
T OFF
UVLO
R
Q
switch
buffer
QKILL
PMOS
V O
INTERNAL
SUPPLY
V OUT
CHARGE
NMOS
V BATT
Max
Ton
n
SDI
Ref
Block
IBIAS
0.61V
1.25V
+
REF
FB
+
-
c
VOLOW
S
Qn
LX
current
reference
+
-
c
LOAD
-
c
overcurrent
comparator
FB
SWITCH GROUND
P GND
R LIM
Ipkset
current
control
current
reference
INTERNAL
GROUND
GND
LBI
0.61V
-
+
c
SP6648
LBON
THEORY OF OPERATION
Detailed Description
The SP6648 is a step-up DC-DC converter that
can start up with input voltages as low as 0.85V
(typically) and operates with an input voltage
down to 0.61V. Ultra low quiescent current of
12 μ A provides excellent efficiency, up to 94%.
In addition to the main switch, a 0.3 Ω internal
MOSFET the SP6648 has an internal synchro-
nous rectifier, increasing efficiency and reduc-
ing the space requirements of an external diode.
An internal inductive-damping switch signifi-
cantly reduces inductive ringing for low-noise,
high efficiency operation. If the supply voltage
drops below 0.61V the SP6648 goes into under
voltage lock-out mode, thus opening both inter-
nal switches. An externally programmable low
battery detector with open drain output provides
the ability to flag a battery-low condition. The
inductor peak current is externally program-
mable to allow for a range of inductor values.
Control Scheme
A minimum off-time, current limited pulse fre-
quency modulation (PFM) control scheme com-
bines the high output power and efficiency of a
pulse width modulation (PWM) device with the
ultra low quiescent current of the traditional
PFM. At low to moderate output loads, the PFM
control provides higher efficiency than tradi-
tional PWM converters are capable of deliver-
ing. At these loads, the switching frequency is
determined by a minimum off-time (t OFF , MIN )
and a maximum on-time (t ON , MAX ) where:
t OFF ≥ K OFF / (V OUT - V BATT ) and
t ON ≤ K ON / V BATT with
K OFF = 1.0V μ s and
K ON = 4.0V μ s.
Date: 6/7/06 Rev B
SP6648 Ultra-low Quiescent Current, High Efficiency Boost Regulator
4
? 2006 Sipex Corporation
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相关代理商/技术参数 |
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|---|---|
| SP6648UEB | 功能描述:电源管理IC开发工具 Ultra Low Quies Cur Hi-Eff Boost Reg RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| SP6649 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Ultra-low Quiescent Current, High Efficiency Boost DC-DC Regulator |
| SP6649EU | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Ultra-low Quiescent Current, High Efficiency Boost DC-DC Regulator |
| SP6649EU/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Ultra-low Quiescent Current, High Efficiency Boost DC-DC Regulator |
| SP664P7FC9086 | 制造商:Thomas & Betts 功能描述:Flush Service Floor Boxes |
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