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RAA207702GBM Schematic ( PDF Datasheet ) - Renesas

Teilenummer RAA207702GBM
Beschreibung (RAA207700GBM - RAA207702GBM) Synchronous Buck Regulator
Hersteller Renesas
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Gesamt 18 Seiten
RAA207702GBM Datasheet, Funktion
Preliminary Datasheet
RAA207700GBM/7701GBM/7702GBM
Synchronous Buck Regulator with
Internal Power MOSFETs
R07DS0891EJ0001
Rev.0.01
Nov 29, 2012
Description
The RAA207700GBM is monolithic synchronous buck regulator with power MOSFETs in extremely small package.
The RAA207700GBM delivers high output current by small Rds(on) Power MOSFETs. Constant on time control
architecture provides fast transient response, and minimize external components. The RAA207700GBM operates skip
mode at light load, it provides high efficiency in all load condition. Three current ability products can be selected.
Features
Wide input voltage range: 3 V to 16 V
Constant-On-Time control
Built-in power MOSFETs suitable for PC, Server application
Very low stand-by current: 0.1 A (typ.)
Very low quiescent current :320 A (typ. at no load)
Switching frequency: Adjustable up to 2 MHz
High average output current, up to 15 A (7700GBM), 10 A (7701GBM), 5 A (7702GBM)
Controllable driver: Remote on/off
Power Good function
Over current protection/Over voltage protection/Thermal shutdown function
Built-in bootstrapping diode
Soft Start period adjustable
Enhanced light load mode function for higher efficiency
High drivability built-in line switch driver for low-loss line switch driving
Extremely small chip size package with solder bump
www.DataSheet.net/
Pb-Free/Halogen-Free
Application Circuit
VCIN
VIN
Line SW
control signal
VCIN
ON/OFF
SET
BOOT
VIN
SS RAA207700GBM
RAA207701GBM SW
RAA207702GBM
PGOOD
LS_IN
LS_OUT SGND
FB
PGND
VOUT_1
Discrete Line SW
VOUT_2
R07DS0891EJ0001 Rev.0.01
Nov 29, 2012
Page 1 of 17
Datasheet pdf - http://www.DataSheet4U.co.kr/






RAA207702GBM Datasheet, Funktion
RAA207700GBM/7701GBM/7702GBM
Preliminary
Electrical Characteristics
(Ta = 25°C, VCIN = 5 V, VIN = 12 V, SW = 0 V, unless otherwise specified)
Item
Symbol
Min
Typ
Max Unit
Test Conditions
Supply
VCIN start threshold
VH
— 4.3 4.5 V
VCIN shutdown threshold in
CCM
VL
3.6 3.8
—V
VCIN shutdown threshold in
ELL mode
VCIN operating current
(RAA207700GBM)
VLCCM
ICIN
— 3.0 3.6 V In ELL mode
(DCM, fSW < 100 kHz)
— 40 — mA fSW = 1 MHz,
Ton = 200 ns
VCIN operating current
(RAA207701GBM)
ICIN
— 35 — mA
VCIN operating current
(RAA207702GBM)
ICIN
— 20 — mA
VCIN quiescent current
Iq
— 320 400 A Output = no load, ELL mode
Remote
on/off
Line_SW
input
Line_SW
output
FB
Power
good
indicator
Soft start
Over
voltage
protection
Over
current
protection
Over
temperature
protection
VCIN disable current
VIN disable current
Disable level
Enable level
Pull-down resistance
Line SW off level
Line SW on level
Pull-down resistance
Line SW on output voltage
Line SW off output voltage
Line SW on source current
Line SW off sink current
Line SW on propagation delay
Line SW off propagation delay
Line SW drive current of VIN
Comparator threshold voltage
FB input current
Rising threshold on FB
Power good hysteresis
Power good resistance
Soft start bias current
OVP trip voltage on FB
ICIN-DISBL
IIN-DISBL
VDISBL
VENBL
RDISBL
VLSIN_OFF
VLSIN_ON
RLS_IN
VLSW_ON
VLSW_OFF
ILSW_SOURCE
ILSW_SINK
TPLSWON
TPLSWOFF
IIN-LS
VFB_COMP
IFB_IN
VPG_rise
dVPG
RPG
ISS
VOVP
2.0
0.7
2.0
0.7
VIN–0.5
www.DataSheet.net/
792
–0.1
0.67
0.25
1.8
0.95
OCP trip current
(RAA207700GBM)
OCP trip current
(RAA207701GBM)
OCP trip current
(RAA207702GBM)
TSD trip temperature
Temperature hysteresis
IOCP
IOCP
IOCP
TTSD
Thys
16.0
12.0
6.4
130
0.1
0.1
1
1
VIN
25
25
300
300
8
800
0
0.72
50
0.5
2.5
1.00
20.0
15.0
8.0
150
30
5
5
0.6
1.3
0.6
1.3
0.1
20
808
+0.1
0.77
1
3.2
1.05
A ON/OFF = 0 V, LS_IN = 0 V
A ON/OFF = 0 V, LS_IN = 0 V
V 3.3 / 5.0 V interface
V 3.3 / 5.0 V interface
MON/OFF = 1 V
V 3.3 / 5.0 V interface
V 3.3 / 5.0 V interface
MLS_IN = 1 V
V LS_IN = 5 V
V LS_IN = 0 V
mA VIN = 12 V, LS_IN = 5 V
mA VIN = 12 V, LS_IN = 0 V
ns LSIN to LSOUT rising
ns LSIN to LSOUT falling
A LS_IN = 5 V
mV
A FB = 1 V
V
mV
kFB = 0 V
A
V
24.0
18.0
9.6
A Fixed internally *1
A Fixed internally *1
A Fixed internally *1
°C *1
°C *1
Note: *1 Not directly tested. Assured by related characteristics test.
R07DS0891EJ0001 Rev.0.01
Nov 29, 2012
Page 6 of 17
Datasheet pdf - http://www.DataSheet4U.co.kr/

6 Page









RAA207702GBM pdf, datenblatt
RAA207700GBM/7701GBM/7702GBM
Preliminary
Operating with Small ESR Output Capacitor
When using low-ESR output capacitor like MLCC, voltage ripple on output voltage node is very small. So voltage
ripple needs to be enhanced by additional components. Recommended ripple enhance method is like below figure.
VIN
SW
FB
Lout
Rf Cf
Cr
Vout
R1
Cout
R2
Ripple injection on FB pin
Rf and Cf make ripple voltage using inductor DCR ripple. Cr is used for AC ripple injection to FB pin. Ripple voltage
between Rf and Cf is described by following equation.
Vripple: (VIN – VOUT) • ton / (Rf • Cf)
Make sure above ripple voltage is larger than 15 mV.
Stability criteria
From loop stability analysis of above circuit configuration, the system must satisfy below equation.
Stability criteria: Lout • Cout / (Rf • Cf ) > ton / 2
If the system cannot satisfy above equation, subharmonic oscillation will occur.
Vout setting
www.DataSheet.net/
Output voltage setting is basically same concept as high ESR capacitor use case. Ripple voltage from injection circuit
affects FB voltage, so it need to be adjust R1, R2 for high accuracy system.
R07DS0891EJ0001 Rev.0.01
Nov 29, 2012
Page 12 of 17
Datasheet pdf - http://www.DataSheet4U.co.kr/

12 Page





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