参数资料
| 型号： | SP6648EU-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 4/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC 0.4A 10MSOP |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 3.3V，2 V ~ 5.5 V |
| 输入电压： | 0.7 V ~ 4.5 V |
| PWM 型： | 电压模式 |
| 电流 - 输出： | 400mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-MSOP |
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
相关PDF资料 |
PDF描述 |
|---|---|
| SP6650EU-L | IC REG BUCK SYNC 3.3V/ADJ 10MSOP |
| SP6651AEU-L | IC REG BUCK SYNC ADJ 0.8A 10MSOP |
| SP6652EU-L | IC REG BUCK SYNC ADJ 1A 10MSOP |
| SP6654EU-L | IC REG BUCK SYNC ADJ 0.8A 10MSOP |
| SP6655ER-L/TR | IC REG BUCK SYNC ADJ 0.4A 10DFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6648LED | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP6648LEDEB | 功能描述:DC/DC 开关控制器 Ultra Low Quies Cur Hi-Eff Boost Reg 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 |
| 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 |
发布紧急采购，3分钟左右您将得到回复。