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参数资料
| 型号： | SP6648EB |
| 厂商： | Exar Corporation |
| 文件页数： | 4/16页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR SP6648 |
| 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 |
参数描述 |
|---|---|
| SP6648ER | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Ultra-low Quiescent Current, High Efficiency Boost Regulator |
| SP6648ER/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Ultra-low Quiescent Current, High Efficiency Boost Regulator |
| SP6648ER-L | 功能描述:DC/DC 开关控制器 Efficiency Boost Regulator RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| SP6648ER-L/TR | 功能描述:DC/DC 开关控制器 Ultra-low Quiescent High Efficiency RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| SP6648EU | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
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