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PDF RAA207700GBM Data sheet ( Hoja de datos )

Número de pieza RAA207700GBM
Descripción (RAA207700GBM - RAA207702GBM) Synchronous Buck Regulator
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No Preview Available ! RAA207700GBM Hoja de datos, Descripción, Manual

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
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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/

1 page




RAA207700GBM pdf
RAA207700GBM/7701GBM/7702GBM
Absolute Maximum Ratings
Item
Symbol
Ratings
Input voltage
VIN –0.3 to +20
Switch node voltage
SW
20(DC), 23(<10 ns)
BOOT voltage
VBOOT
25(DC), 28(<10 ns)
Controller voltage
VCIN
–0.3 to +6
Input pin voltage (FB, LS_IN)
ON/OFF voltage
SET voltage
PGOOD voltage
PGOOD sink current
Operating junction temperature
VINPUT
VON/OFF
VSET
VPGOOD
IPGOOD
Tj-opr
–0.3 to VCIN +0.3
–0.3 to VIN
–0.3 to VIN
–0.3 to VIN
+2
–40 to +125
Storage temperature
Tstg
–55 to +150
Notes: 1. Rated voltages are relative to voltages on the SGND and PGND pins.
2. BOOT – VCIN < 20 V
3. VCIN + 0.3 V < 6 V
4. For rated current, (+) indicates inflow to the chip.
Preliminary
(Ta = 25°C)
Unit Notes
V1
V1
V 1, 2
V1
V 1, 3
V1
V1
V1
mA 4
°C
°C
Recommended Operating Condition
Item
Input voltage
Controller voltage
Continuous output current
Symbol
VIN
VCIN
IOUT
Ratings
3 to 16
4.5 to 5.5
0 to 15
0 to 10
0 to 5
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Unit Remarks
V
V
A 15 A: RAA207700GBM
10 A: RAA207701GBM
5 A: RAA207702GBM
R07DS0891EJ0001 Rev.0.01
Nov 29, 2012
Page 5 of 17
Datasheet pdf - http://www.DataSheet4U.co.kr/

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RAA207700GBM arduino
RAA207700GBM/7701GBM/7702GBM
Preliminary
Stability Criteria, Output Voltage Setting for High ESR Output Capacitor
Small output ripple voltage makes control loop unstable in constant on time architecture. Ripple voltage needs to be
larger than 15 mV on FB pin. When using high ESR (>50 m) capacitor such as Electrolytic capacitor, Polymer
aluminum capacitor for output capacitor, ripple voltage on FB pin will be more than 15 mV.
VIN
SW
FB
Lout
R1
Vout
ESR
R2 Cout
Stability criteria
From loop stability analysis, constant on time control system must satisfy below equation.
Stability criteria: ESR • Cout > ton / 2
Here, ton is constant on time. If the system cannot satisfy above equation, subharmonic oscillation will occur.
Vout setting
FB comparator compares FB voltage and internal accurate reference voltage (0.8 V). Feedback loop controls FB voltage
to match the reference voltage. Therefore, output voltage is set by following equation.
Vout: 0.8 V • (R1+R2) / R2
Here, R1 and R2 is output voltage divider resister (refer to above figure). However, ripple voltage on FB pin affects FB
voltage, so Vout slightly shifts from setting value. If the system needs high accuracy, adjust Vout by changing R1, R2
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value.
R07DS0891EJ0001 Rev.0.01
Nov 29, 2012
Page 11 of 17
Datasheet pdf - http://www.DataSheet4U.co.kr/

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