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SP7662 の電気的特性と機能

SP7662のメーカーはSipex Corporationです、この部品の機能は「Buck Regulator」です。


製品の詳細 ( Datasheet PDF )

部品番号 SP7662
部品説明 Buck Regulator
メーカ Sipex Corporation
ロゴ Sipex Corporation ロゴ 




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SP7662 Datasheet, SP7662 PDF,ピン配置, 機能
www.DataSheet4U.com
Wide Input Voltage Range
12A, 300kHz, Buck Regulator
SP7662
PowerBlox TM
FEATURES
4.75V to 22V Input Voltage Range using Single Supply
3V to 22V Input Voltage Range using Dual Supply
±1% 0.8V Reference
12A Output Capability
Current Limiting using Inductor DCR
Built in Low RDS(ON) Power Switches
300 kHz Fixed Frequency Operation
Over Temperature Protection
Short Circuit Protection with Auto-Restart
Wide BW Amp Allows Type II or III Compensation
Programmable Soft Start
Fast Transient Response
High Efficiency: Greater than 95% Possible
Nonsynchronous Start-Up into a Pre-Charged Output
Available in RoHS Compliant, Lead Free Packaging:
Small 7mm x 4mm DFN
U.S. Patent #6,922,041
SP7662
DFN PACKAGE
7mm x 4mm (Option 2)
LX 26
LX 25
LX 24
LX 23
VCC 2 2
UVIN 21
GND 20
GND 19
VIN 18
BST 17
LX 16
LX 15
LX 14
BOTTOM VIEW
Heatsink Pad 1
Connect to Lx
Pin 27
Heatsink Pad 2
Connect to GND
Pin 28
Heatsink Pad 3
Connect to VIN
Pin 29
1 PGND
2 PGND
3 PGND
4 PGND
5 GND
6 VFB
7 COMP
8 SS
9 GND
10 ISN
11 ISP
12 SWN
13 VINP
DESCRIPTION
The SP7662 is a synchronous step-down switching regulator optimized for high efficiency. The part is designed
for use with a single 4.75V to 22V single supply or 3V to 22V input if an external Vcc is provided. The SP7662 pro-
vides a fully integrated buck regulator solution using a fixed 300 kHz frequency, PWM voltage mode architecture.
Protection features include UVLO, thermal shutdown, output current limit and short circuit protection. The SP7662
is available in the space saving DFN package.
TYPICAL APPLICATION CIRCUIT
VIN
12V
C3 C2
22uF 22uF
C1
22uF
GND
CZ2 RZ2
10nF 4020
CP1 100pF
CF1
100pF
CSS 47nF
R8 NP
C9 6.8nF
ISN
ISP
LX
1 PGND
LX 26
2 PGND
LX 25
3 PGND
U1
LX 24
4 PGND SP7662 LX 23
5 GND
VCC 22
6 VFB
UVIN 21
7 COMP
GND 20
8 SS
GND 19
9 GND
VIN 18
10 ISN
BST 17
11 ISP
LX 16
12 SWN
LX 15
13 VINP
LX 14
L1, SC5018-2R7M
2.7uH, 4.1m
R3
5.11K
R4
5.11K
C4 .1uF
R9 NP
ISP ISN
CVCC
4.7uF
NC
RBST
5.1
22nF
CBST
SD101AWS
DBST
Rs1 Cs1 LX
1 2.2nF
Rs2 Cs2
1 2.2nF
VOUT
3.30V, 0-12A
RZ3
453
CZ3
2.2nF
C5 C6
100uF 100uF
R1
10k
GND
R2
3160
Nov13-06 Rev AE
SP7662 Wide Input Voltage Range 12A, 300kHz Buck Regulator

© 2006 Sipex Corporation

1 Page





SP7662 pdf, ピン配列
ELECTRICAL SPECIFICATIONS
Specifications are for TAMB = TJ = 25°C, and those denoted by apply over the full operating range, -40°C< Tj< 125°C. Unless
otherwise specified: 4.5V < Vcc < 5.5V, 3V < Vin < 22V, BST = LX + 5V, UVIN = 3V, CVCC = 1µF, CCOMP = 0.1µF, Css = 50nF.
PARAMETER
MIN TYP MAX UNITS CONDITIONS
CONTROL LOOP: PWM COMPARATOR, RAMP & LOOP DELAY PATH
Ramp Amplitude
RAMP Offset
Ramp offset Temperature
Coefficient
0.80 1.00
1.7 2.0
-2
1.20
2.3
V
V
mV/°C
GH Minimum Pulse Width
50 180 ns
Maximum Controllable
Duty Ratio
92 97
%
Maximum Duty Ratio
100
% Valid for 20 cycles
Internal Oscillator Ratio 255 300 345 kHZ
TIMERS: SOFTSTART
SS Charge Current:
SS Discharge Current:
-16 -10 -4.0 µA
1.0 2.0 3.0 mA
Fault Present,
SS=0.2V
PROTECTION: SHORT CIRCUIT, OVERCURRENT & THERMAL
Short Circuit Threshold
Voltage
0.20
Hiccup Timeout
170
Overcurrent Threshold
Voltage
54
ISP, ISN Common Mode
Range
0
Thermal Shutdown
Temperature
135
Thermal Recovery
Temperature
Thermal Hysteresis
0.25
220
60
145
135
10
0.30
270
66
3.6
155
V
ms
Vfb=0.5V
mV Measured ISP - ISN
V
°C Guaranteed by design
°C
°C
OUTPUT: POWER STAGE
High Side Switch RDSON
16.8 20.5 mΩ
VGS=4.5V; Idrain=5A;
TAMB=25°C
Synchronous Low Side
Switch RDSON
6.8 8.5 mΩ
VGS=4.5V; Idrain=5A;
TAMB=25°C
Maximum Output
Current
12
A
Nov13-06 Rev AE
SP7662 Wide Input Voltage Range 12A, 300kHz Buck Regulator

© 2006 Sipex Corporation


3Pages


SP7662 電子部品, 半導体
General Overview
The SP7662 is a fixed frequency, volt-
age mode, synchronous PWM regulator
optimized for high efficiency. The part has
been specifically designed for single supply
operation from a 5V to 22V input.
The heart of the SP7662 is a wide bandwidth
transconductance amplifier designed to ac-
commodate Type II and Type III compensa-
tion schemes. A precision 0.8V reference,
present on the positive terminal of the error
amplifier, permits the programming of the
output voltage down to 0.8V via the VFB
pin. The output of the error amplifier, COMP,
is compared to a 1.1V peak-to-peak ramp,
which is responsible for trailing edge PWM
control. This voltage ramp and PWM control
logic are governed by the internal oscillator
that accurately sets the PWM frequency to
300kHz.
The SP7662 contains two unique control
features that are very powerful in distributed
applications. First, nonsynchronous driver
control is enabled during startup, to prohibit
the low side switch from pulling down the
output until the high side switch has at-
tempted to turn on. Second, a 100% duty
cycle timeout ensures that the low side switch
is periodically enhanced during extended
periods at 100% duty cycle. This guaran-
tees the synchronized refreshing of the
BST capacitor during very large duty ratios.
The SP7662 also contains a number of valu-
able protection features. Programmable VIN
UVLO allows the user to set the exact value
at which the conversion voltage can safely
begin down-conversion, and an internal VCC
UVLO which ensures that the controller itself
has enough voltage to properly operate.
Other protection features include thermal
shutdown and short-circuit detection. In the
event that either a thermal, short-circuit, or
UVLO fault is detected, the SP7662 is forced
into an idle state where the output drivers
are held off for a finite period before a restart
is attempted.
THEORY OF OPERATION
Soft Start
“Soft Start” is achieved when a power con-
verter ramps up the output voltage while
controlling the magnitude of the input sup-
ply source current. In a modern step down
converter, ramping up the positive terminal
of the error amplifier controls soft start. As a
result, excess source current can be defined
as the current required to charge the output
capacitor.
IVIN = Cout • (Vout / Tsoft-start)
The SP7662 provides the user with the op-
tion to program the soft start rate by tying
a capacitor from the SS pin to GND. The
selection of this capacitor is based on the
10µA pull up current present at the SS pin
and the 0.8V reference voltage. Therefore,
the excess source can be redefined as:
IVIN = Cout [Vout •10µA / (Css • 0.8V)]
Under Voltage Lock Out (UVLO)
The SP7662 has two separate UVLO com-
parators to monitor the bias (Vcc) and Input
(Vin) voltages independently. The Vcc UVLO
is internally set to 4.25V. The Vin UVLO is
programmable through UVIN pin. When
UVIN pin is greater than 2.5V the SP7662
is permitted to start up pending the removal
of all other faults. A pair of internal resistors
is connected to UVIN as shown in the figure
below.
SP7662
VIN
R4 140KΩ
UVIN
+
2.5V ON
2.2V OFF
-
R5
50KΩ
GND
Internal and external bias of UVIN
Nov13-06 Rev AE
SP7662 Wide Input Voltage Range 12A, 300kHz Buck Regulator

© 2006 Sipex Corporation

6 Page



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