Anpec APW7037B 8-pin synchronous buck pwmcontroller Datasheet

APW7037A/B
8-PIN Synchronous Buck PWM Controller
Features
General Description
•
•
•
The APW7037 series are designed to provide a low cost
synchronous Buck regulator for on-board DC to DC con-
•
•
•
Operating with Single 5V or 12V Input
Drives N-Channel MOSFETs
Simple Single-Loop Control Design
verter applications. The APW7037 series together with
dual N-channel MOSFETs such as APM7313, provide a
- Voltage-Mode PWM Control
- Full 0% to 100% Duty Ratio
low cost solution for such applications. Each device features an internal 200/400kHz oscillator, Power-On-Reset
- Fast Transient Response
(POR) for both VCC and VC supplies, an external programmable soft-start function as well as output under-
±2% Output Voltage Accuracy Over Temperature
voltage detection that latches off the device when an output short is detected.
Under-Voltage Protection for Output
200/400kHz Constant Frequency Operation
- 200kHz for APW7037B
- 400kHz for APW7037A
•
•
Small size, 8-PIN Package (SOIC or TSSOP)
Pin Configuration
Lead Free and Green Devices Available
(RoHS Compliant)
Applications
•
•
•
•
Graphics Cards
FB
1
8
SS
VCC
2
7
COMP
LDRV
3
6
VC
GND
4
5
HDRV
DDR Memory Power Supply
DDR Memory Termination Voltage
Low-Voltage Distributed Power Supplies
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.7 - Jun. , 2008
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APW7037A/B
Ordering and Marking Information
Package Code
K : SOP-8
O : TSSOP-8
Operating Junction Temperature Range
C : 0 to 70oC
Handling Code
TR : Tape & Reel
Assembly Material
L : Lead Free Device
G : Halogen and Lead Free Device
APW7037A/B
Assembly Material
Handling Code
Temperature Range
Package Code
APW7037A/B
XXXXX
APW7037A/B K :
APW7037A/B O :
XXXXX - Date Code
APW7037A/B
XXXXX
XXXXX - Date Code
Note : ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination finish;
which are fully compliant with RoHS. ANPEC lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J-STD020C for MSL classification at lead-free peak reflow temperature. ANPEC defines “Green” to mean lead-free (RoHS compliant) and
halogen free (Br or Cl does not exceed 900ppm by weight in homogeneous material and total of Br and Cl does not exceed
1500ppm by weight).
Absolute Maximum Ratings
Symbol
Parameter
Rating
Unit
VCC
VCC to GND
-0.2~30
V
VC
VC to GND
-0.2~30
V
TJ
Operating Junction Temperature
0~125
°C
-65~150
°C
260
°C
TSTG
Storage Temperature
TSDR
Maximum Lead Soldering Temperature, 10 Seconds
Thermal Characteristics
Symbol
θJA
Parameter
Typical Value
Unit
160
124
°C/W
Thermal Resistance in Free Air
Copyright  ANPEC Electronics Corp.
Rev. A.7 - Jun., 2008
SOP-8
TSSOP-8
2
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APW7037A/B
Electrical Characteristics
Unless otherwise specified, these specifications apply over VCC=5V, VC=12V and TA =0 to 70°C. Typical values refer to TA =25°C.
APW7037/A/B
Parameter
Symbol
Unit
Test Conditions
Min.
Typ.
Max.
FOSC=200kHz, CL=1500pF
2
3
5
mA
VC Dynamic Supply Current
FOSC=200kHz, CL=1500pF
2
5.5
8
mA
VCC Static Supply Current
SS=GND
0.5
1.5
3
mA
VC Static Supply Current
SS=GND
0.2
0.4
1
mA
SUPPLY CURRENT
ICC
IC
ICCQ
ICQ
VCC Dynamic Supply
Current
POWER-ON-RESET
Rising VCC Threshold
4.0
4.2
4.4
V
VCC POR Hysteresis
-
0.25
-
V
Rising VC Threshold
3.1
3.3
3.5
V
VC POR Hysteresis
-
0.2
-
V
APW7037A
360
400
440
APW7037B
180
200
220
-
1.10
-
V
-
1
-
nA
OSCILLATOR
FOSC
Free Running Frequency
∆VOSC
Ramp Amplitude
kHz
ERROR AMPLIFIER
IFB1
FB Pin Input Bias Current
SS=3V, VFB=1V
IFB2
FB Pin Input Bias Current
SS=0V, VFB=1V
GM
Transconductance
-
-64
-
µA
450
600
750
µmho
APW7037A
0. 784
0. 800
0. 816
APW7037B
0.784
0.800
0.816
-
0.2
REFERENCE VOLTAGE
VFB
LREG
FB Pin Regulation Voltage
VFB Line Regulation
VCC = 5~12V
0.35
V
%
GATE DRIVERS
HDRV Rising Time
CL = 1500pF
-
20
50
nS
HDRV Falling Time
CL = 1500pF
-
15
50
nS
LDRV Rising Time
CL = 1500pF
-
25
50
nS
LDRV Falling Time
CL = 1500pF
-
25
50
50
150
250
nS
nS
APW7037A
0.3
0.4
0.5
V
APW7037B
0.3
0.4
0.5
-
0.5
-
V
10
20
30
µA
Dead Band Time
PROTECTION
VFBUV
FB Under-Voltage Threshold
VFB Falling
VSD
Shutdown Threshold Voltage
Pull the voltage of SS pin
ISS
Soft-Start Current
SS=0
Copyright  ANPEC Electronics Corp.
Rev. A.7 - Jun., 2008
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APW7037A/B
Function Pin Description
FB (Pin 1)
SS (Pin 8)
Connect this pin to the output (VOUT) of the PWM converter via an external resistor divider to provide a voltage
Connect a capacitor from this pin to ground.This capacitor,
along with an internal 20µA current source, sets the soft-
feedback path for the converter. The output voltage set by
the resistor divider is determined using the following for-
start interval of the PWM converter and prevents the outputs from overshoot as well as limits the input current.
mula :
Pull this pin below 0.5V can shutdown the converter.
VOUT = VREF x ( 1+
R OUT
)
R GND
where ROUT is the resistor connected from VOUT to FB
, and RGND is the resistor connected from FB to ground.
The voltage at this pin is also monitored for Under-Voltage protection.
VCC (Pin 2)
Connect this pin to input voltage from 5V to 20V. This pin
provides the bias for the control circuitry and the low-side
power MOSFET driver (LDRV). The voltage at this pin is
monitored for Power-On-Reset (POR) purpose.
LDRV (Pin 3)
Connect this pin to the gate of the low-side power
MOSFET. This pin provides the gate drive for the MOSFET.
GND (Pin 4)
Signal and power ground for the IC. All voltage levels are
measured with respect to this pin.
HDRV (Pin 5)
Connect this pin to the gate of the high-side power
MOSFET. This pin provides the gate drive for the
MOSFET.
VC (Pin 6)
This pin provides bias voltage to the high-side MOSFET
driver. A bootstrap circuit may be used to pump a boot
voltage for enforcing the driving capability of the gate driver
and improving the performance of the MOSFET.
COMP (Pin 7)
This pin is the output of the error amplifier. Add an external resistor-capacitor network to provide a loop compensation for the PWM converter.
Copyright  ANPEC Electronics Corp.
Rev. A.7 - Jun., 2008
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APW7037A/B
Block Diagram
SS
VCC
20uA
4.5V
Regulator
3.3V
Max .
64uA
POR
Pow er
On Reset
VC
HDRV
Under-Voltage
V FBUV
25k
PWM
FB
Gate
Control
V CC
Error
Amp.
25k
LDRV
V REF
OSC
FOSC
GND
COMP
Typical Application Circuit
1. Dual supply voltage(5V and 12V) application
R4
3
+12V
2
6
C1
1uF
VCC
Q2
APM2300
A
Shutdown
8
C2
1uF
C5
1uF
VC
SS
HDRV
Q1A
APM7313
5
U1
APW7037A/B
C7
0.1uF
COMP
GND
Copyright  ANPEC Electronics Corp.
Rev. A.7 - Jun., 2008
C6,C9
2 x 150uF
R1
249
1
R2
1.24k
4
C8
2200pF
FB
L4
3.3uH
Q1B
APM7313
LDRV
R3
24k
C3
47uF
VIN
+5V
VOUT
1.5V/5 A
3
7
C4
100uF
L3
1uH
5
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APW7037A/B
Typical Application Circuit (Cont.)
2. Single supply voltage(5V) application
R4
3
D1
1N4148
D3
1N4148
C1
1uF
C5
100uF
C6
1uF
VC
L3
1uH
C4
47uF
VIN
+5V
C3
0.1uF
Q2
APM2300
A
8
SS
HDRV
LDRV
COMP
R3
24k
GND
VOUT
1.5V/5 A
R1
249
1
R2
1.24k
4
C9
2200pF
FB
C7,C10
2
x150uF
Q1B
APM7312
3
7
L4
3.3uH
Q1A
APM7312
5
U1
APW7037A/B
C8
0.1uF
Shutdown
C2
1uF
6
2
VCC
D2
1N4148
3. LCD Monitor Application Circuit
R8 0
R4
3
Extra Circuit for VIN>15V Application
C11
1uF
D2
1N4148
6
2
VCC
R5
18k
R7 1k
C12
0.1uF
U2
APL431
R6
10k
D1
1N4148
C1
1uF
Q2
2N3904
C2
1uF
C6
1uF
VC
L3
C5
1uH
470uF
C4
47uF
VIN
9V~22V
C3
0.1uF
8
SS
HDRV
C8
0.1uF
Q1A
APM7313
5
U1
APW7037A/B
R9
12
Q1B
APM7313
3
7
LDRV
COMP
R10
12
R3
24k
GND
Copyright  ANPEC Electronics Corp.
Rev. A.7 - Jun., 2008
C7,C10
2 x470uF
VOUT
5V / 0.2~5 A
R1
3k
1
R2
1k
4
C9
2200pF
FB
L4
50uH
6
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APW7037A/B
Package Information
SOP-8
D
E
E1
SEE VIEW A
h X 45
°
c
A
0.25
b
GAUGE PLANE
SEATING PLANE
A1
A2
e
L
VIEW A
S
Y
M
B
O
L
SOP-8
MILLIMETERS
MIN.
INCHES
MAX.
A
MIN.
MAX.
1.75
0.069
0.004
0.25
0.010
A1
0.10
A2
1.25
b
0.31
0.51
0.012
0.020
c
0.17
0.25
0.007
0.010
D
4.80
5.00
0.189
0.197
E
5.80
6.20
0.228
0.244
E1
3.80
4.00
0.150
0.157
e
0.049
1.27 BSC
0.050 BSC
h
0.25
0.50
0.010
0.020
L
0.40
1.27
0.016
0.050
0
0°
8°
0°
8°
Note: 1. Follow JEDEC MS-012 AA.
2. Dimension “D” does not include mold flash, protrusions or gate burrs.
Mold flash, protrusion or gate burrs shall not exceed 6 mil per side.
3. Dimension “E” does not include inter-lead flash or protrusions.
Inter-lead flash and protrusions shall not exceed 10 mil per side.
Copyright  ANPEC Electronics Corp.
Rev. A.7 - Jun., 2008
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APW7037A/B
Package Information
TSSOP-8
D
E
E1
SEE VIEW A
C
A
0.25
b
A2
e
GAUGE PLANE
A1
SEATING PLANE
S
Y
M
B
O
L
VIEW A
L
TSSOP-8
INCHES
MILLIMETERS
MIN.
MIN.
MAX.
A
MAX.
0.047
1.20
A1
0.05
0.15
0.002
0.006
A2
0.80
1.05
0.031
0.041
b
0.19
0.30
0.007
0.012
c
0.09
0.20
0.004
0.008
D
2.90
3.10
0.114
0.122
E
6.20
6.60
0.244
0.260
E1
4.30
4.50
0.169
0.177
0.65 BSC
e
L
0.45
0
0
°
0.026 BSC
0.75
8°
0.018
0.030
0°
8°
Note : 1. Follow JEDEC MO-153 AA
2. Dimension "D" does not include mold flash, protrusions
or gate burrs. Mold flash, protrusion or gate burrs shall not
exceed 6 mil per side.
3. Dimension "E1" does not include inter-lead flash or protrusions.
Inter-lead flash and protrusions shall not exceed 10 mil per side.
Copyright  ANPEC Electronics Corp.
Rev. A.7 - Jun., 2008
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APW7037A/B
Carrier Tape & Reel Dimensions
P0
P2
P1
A
B0
W
F
E1
OD0
K0
A0
A
OD1 B
B
T
SECTION A-A
SECTION B-B
H
A
d
T1
A
Application
H
330.0±2.00 50 MIN.
T1
C
d
D
12.4+2.00 13.0+0.50 1.5 MIN.
-0.00
-0.20
P0
P1
P2
D0
D1
4.0±0.10
8.0±0.10
2.0±0.05
1.5+0.10
-0.00
1.5 MIN.
A
H
T1
C
d
SOP-8
Application
330.0±2.00 50 MIN.
P0
TSSOP-8
P1
P2
4.00±0.10 8.00±0.10 2.00±0.05
D1
1.5+0.10
-0.00
1.5 MIN.
A0
B0
F
5.5±0.05
K0
0.6+0.00
-0.40 6.40±0.20 5.20±0.20 2.10±0.20
D
D0
E1
20.2 MIN. 12.0±0.30 1.75±0.10
T
12.4+2.00 13.0+0.50
-0.00
-0.20 1.5 MIN.
W
W
E1
20.2 MIN. 12.0±0.30 1.75±0.10
T
A0
B0
F
5.5±0.10
K0
0.6+0.00
-0.40 6.90±0.20 3.40±0.20 1.60±0.20
(mm)
Devices Per Unit
Package Type
Unit
Quantity
SOP-8
Tape & Reel
2500
TSSOP-8
Tape & Reel
2500
Copyright  ANPEC Electronics Corp.
Rev. A.7 - Jun., 2008
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APW7037A/B
Reflow Condition
(IR/Convection or VPR Reflow)
tp
TP
Critical Zone
TL to TP
Temperature
Ramp-up
TL
tL
Tsmax
Tsmin
Ramp-down
ts
Preheat
25
t 25°C to Peak
Time
Reliability Test Program
Test item
SOLDERABILITY
HOLT
PCT
TST
ESD
Latch-Up
Method
MIL-STD-883D-2003
MIL-STD-883D-1005.7
JESD-22-B, A102
MIL-STD-883D-1011.9
MIL-STD-883D-3015.7
JESD 78
Description
245°C, 5 sec
1000 Hrs Bias @125°C
168 Hrs, 100%RH, 121°C
-65°C~150°C, 200 Cycles
VHBM > 2KV, VMM > 200V
10ms, 1tr > 100mA
Classification Reflow Profiles
Profile Feature
Average ramp-up rate
(TL to TP)
Preheat
- Temperature Min (Tsmin)
- Temperature Max (Tsmax)
- Time (min to max) (ts)
Time maintained above:
- Temperature (TL)
- Time (tL)
Peak/Classification Temperature (Tp)
Time within 5°C of actual
Peak Temperature (tp)
Ramp-down Rate
Sn-Pb Eutectic Assembly
Pb-Free Assembly
3°C/second max.
3°C/second max.
100°C
150°C
60-120 seconds
150°C
200°C
60-180 seconds
183°C
60-150 seconds
217°C
60-150 seconds
See table 1
See table 2
10-30 seconds
20-40 seconds
6°C/second max.
6°C/second max.
6 minutes max.
8 minutes max.
Time 25°C to Peak Temperature
Note: All temperatures refer to topside of the package. Measured on the body surface.
Copyright  ANPEC Electronics Corp.
Rev. A.7 - Jun., 2008
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APW7037A/B
Classification Reflow Profiles (Cont.)
Table 1. SnPb Eutectic Process – Package Peak Reflow Temperatures
3
Package Thickness
Volume mm
<350
<2.5 mm
240 +0/-5°C
≥2.5 mm
225 +0/-5°C
3
Volume mm
≥350
225 +0/-5°C
225 +0/-5°C
Table 2. Pb-free Process – Package Classification Reflow Temperatures
3
3
3
Package Thickness
Volume mm
Volume mm
Volume mm
<350
350-2000
>2000
<1.6 mm
260 +0°C*
260 +0°C*
260 +0°C*
1.6 mm – 2.5 mm
260 +0°C*
250 +0°C*
245 +0°C*
≥2.5 mm
250 +0°C*
245 +0°C*
245 +0°C*
*Tolerance: The device manufacturer/supplier shall assure process compatibility up to and including the
stated classification temperature (this means Peak reflow temperature +0°C. For example 260°C+0°C)
at the rated MSL level.
Customer Service
Anpec Electronics Corp.
Head Office :
No.6, Dusing 1st Road, SBIP,
Hsin-Chu, Taiwan
Tel : 886-3-5642000
Fax : 886-3-5642050
Taipei Branch :
2F, No. 11, Lane 218, Sec 2 Jhongsing Rd.,
Sindian City, Taipei County 23146, Taiwan
Tel : 886-2-2910-3838
Fax : 886-2-2917-3838
Copyright  ANPEC Electronics Corp.
Rev. A.7 - Jun., 2008
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