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PDF APW7199 Data sheet ( Hoja de datos )
| Número de pieza | APW7199 | |
| Descripción | High-Performance Step-Down PWM Controller | |
| Fabricantes | Anpec Electronics Coropration | |
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APW7199
High-Performance Step-Down PWM Controller with PFM
Features
General Description
• Operates from An Input BatteryVoltage Range of The APW7199 is a single-phase, constant-on-time, and
+3V to +25V
• ±0.6% 0.5V Reference
synchronous P WM controller, which drives N-channel
MOSFETs. An internal 0.5V temperature-compensated
reference voltage with high accuracy is designed to meet
- Over Line, Load Regulation, and OperatinTgemp. the requirement of low output voltage applications. The
• Drive Dual Low Cost N-Channel MOSFETs
- Adaptive Shoot-Through Protection
APW7199 steps down high voltage to generate low-volt-
age chipset or RAM supplies in notebook computers.
The PWM controller operates fixed 300kHz pseudo-con-
• Power-On-Reset Monitoring on VCC Pin
stant frequency P WM with an adaptive constant-on-time
• PFM Mode for Increasing Light Load Efficiency control. The device provides excellent transient response
and accurate DC voltage output in either PFM or P WM
• Constant-On-Time Control Scheme
Mode. In Pulse Frequency Mode (PFM), the AWP7199 pro-
- Switching Frequency Compensation for PWM vides very high efficiency over light to heavy loads with
Operation
• 300kHz Constant Switching Frequency
loading-modulated switching frequencies. The device
works in ultrasonic mode with PFM at no load. The unique
ultrasonic mode maintains the switching frequency above
• Integrated MOSFET Drivers and Bootstrap Diode 20kHz, which eliminates noise in audio applications.
• Internal Soft-Start and Soft-Stop
• Power Good Monitoring
The APW7199 is equipped with accurate over-current,
output under-voltage, and output over-voltage protections.
A Power-On-Reset function monitors the voltage on VCC
• 70% Under-Voltage Protection
to prevent wrong operation during power-on. The
• 125% Over-Voltage Protection
- Using Low-Side MOSFET’s RDS(ON)
• Over-Temperature Protection
APW7199 has a 1.5ms digital soft-start to ramp up the
output voltage to reduce the start-up current. A soft-stop
function actively discharges the output capacitors with
controlled reverse inductor current.
• TDFN-10 3mmx3mm Package
The APW7199 is available in TDFN3x3-10 package.
• Lead Free and Green Devices Available
(RoHS Compliant)
Applications
• Notebook
• Low Cost PC
Simplified Application Circuit
5V VIN
BOOT
EN/EXTREF
VCC
UGATE
PHASE
Q1
LOUT
VOUT
• Wide Input DC/DC Regulators
LGATE/OCSET
Q2 COUT
POK
ROCSET
APW7199
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and
advise customers to obtain the latest version of relevant information to verify before placing orders.
Copyright © ANPEC Electronics Corp.
Rev. A.3 - Aug., 2010
1
www.anpec.com.tw
http://www.Datasheet4U.com
1 page  
APW7199
Electrical Characteristics (Cont.)
Refer to the typical application circuits. These specifications apply over VCC = 5V, and TA = -40 ~ 85°C, unless otherwise
specified. Typical values are at TA = 25°C.
Symbol
Parameter
Test Conditions
Min.
APW7199
Typ.
Max.
Unit
PROTECTIONS (CONT.)
VUV
Under-Voltage Protection
Threshold
65 70 75 %
Under-Voltage Protection
Debounce Interval
- 2 - µs
VOVR
Over-Voltage Protection Rising
Threshold
120 125 133 %
Over-Voltage Protection Falling
Threshold
100 105 110 %
Over-Voltage Protection
Debounce Interval
- 2 - µs
TOTR
Over-Temperature Protection
Rising Threshold (Note 4)
- 150 - oC
Over-Temperature Protection
Hysteresis (Note 4)
- 20 - oC
Note4: Guaranteed by design.
Copyright © ANPEC Electronics Corp.
Rev. A.3 - Aug., 2010
5
www.anpec.com.tw
5 Page 
APW7199
Pin Description
PIN
NO. NAME
FUNCTION
This pin provides ground referenced bias voltage to the high-side MOSFET driver. A bootstrap
1
BOOT
circuit with a diode connected to 5V is used to create a voltage suitable to drive a logic-level
N-channel MOSFET.
2
UGATE
Connect this pin to the high-side N-channel MOSFET’s gate. This pin provides gate drive for the
high-side MOSFET.
3
PHASE
The pin provides return path for the high-side MOSFET driver’s pull-low current. Connect this pin
to the high-side MOSFET’s source.
The GND terminal provides return path for the IC’s bias current and the low-side MOSFET
4
GND
driver’s pull-low current. Connect the pin to the system ground via very low impedance layout on
PCBs.
5
LGATE/OCSET
Low-side Gate Driver Output and Over-Current Setting Input. This pin is the gate driver for
low-side MOSFET.
Connect this pin to a 5V supply voltage. This pin provides bias supply for the control circuitry and
6
VCC
the low-side MOSFET driver. The voltage at this pin is monitored for the Power-On-Reset (POR)
purpose. Decoupling capacitor (4.7µF) be connected to GND for noise decoupling.
Output Voltage Feedback pin. This pin is connected to the resistive divider that set the desired
7 FB output voltage. The POK, UVP, and OVP circuits detect this signal to report output voltage
status.
8
VOUT
The VOUT pin makes a direct measurement of the converter output voltage. The VOUT pin
should be connected to the top feedback resistor at the converter output.
9
POK
POK is an open drain output used to indicate the status of the output voltage. Connect the POK
pin to +5V through a pull-high resistor.
10 EN/EXTREF Enable/Shutdown Pin or External Reference Selection of The PWM Controller.
Copyright © ANPEC Electronics Corp.
Rev. A.3 - Aug., 2010
11
www.anpec.com.tw
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet APW7199.PDF ] | |
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