Anpec APW7037KC-TU 8-pin synchronous buck pwm controller Datasheet

APW7037/A/B
8-PIN Synchronous Buck PWM Controller
Features
General Description
•
•
•
Operating with Single 5V or 12V Input
The APW7037 series are designed to provide a low
Drives N-Channel MOSFETs
cost synchronous Buck regulator for on-board DC to
Simple Single-Loop Control Design
DC converter applications. The APW7037 series to-
− Voltage-Mode PWM Control
− Full 0% to 100% Duty Ratio
− Fast Transient Response
gether with dual N-channel MOSFETs such as
APM7313, provide a low cost solution for such
applications. Each device features an internal 200/
• ±2% Output Voltage Accuracy Over Temperature
• Under-Voltage Protection for Output
• 200/400kHz Constant Frequency Operation
400kHz oscillator, Power-On-Reset (POR) for both VCC
and VC supplies, an external programmable soft-start
function as well as output under-voltage detection that
latches off the device when an output short is detected.
-200kHz for APW7037 & APW7037B
-400kHz for APW7037A
•
•
Small size, 8-PIN Package (SOIC or TSSOP)
Pin Description
Lead Free Available (RoHS Compliant)
Applications
•
•
•
•
Graphics Cards
DDR Memory Power Supply
FB
1
8
SS
VCC
2
7
COMP
LDRV
3
6
VC
GND
4
5
HDRV
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.6 - Apr , 2005
1
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APW7037/A/B
Ordering and Marking Information
Package Code
K : SO-8
R : TSSOP-8
Operating Junction Temp. Range
C : 0 to 70°C
Handling Code
TU : Tube
TR : Tape & Reel
Lead Free Code
L : Lead Free Device Blank : Original Device
APW 7037/A/B
Lead Free Code
Handling Code
Temp. Range
Package Code
APW 7037/A/B K :
APW 7037/A/B
XXXXX
XXXXX - Date Code
APW 7037/A/B
XXXXX
APW 7037/A/B R :
XXXXX - Date Code
Notes: ANPEC lead-free products contain molding compounds/die attach materials and 100% matte in plate termination finish; which are fully compliant with RoHS and compatible with both SnPb and lead-free soldiering operations.
ANPEC lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J STD-020C for MSL classification at lead-free peak reflow temperature.
Block Diagram
SS
V CC
20uA
4.5V
Regulator
3.3V
Max .
64uA
POR
Pow er
On Res et
VC
HDRV
Under-V oltage
V F BU V
25k
PW M
FB
25k
Gate
Control
V CC
Error
A mp.
V R EF
LDRV
OSC
FOSC
CO M P
G ND
Absolute Maximum Ratings
Description
Rating
-0.2~30
-0.2~30
0~125
-65~150
300
±2
VCC to GND
VC to GND
Operating Junction Temperature
Storage Temperature
Soldering Temperature (10 Seconds)
Minimum ESD Rating
Copyright  ANPEC Electronics Corp.
Rev. A.6 - Apr, 2005
2
Unit
V
V
°C
°C
°C
kV
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APW7037/A/B
Thermal Characteristics
Symbol
θJA
Parameter
Thermal Resistance in Free Air
8-pin SOIC
8-pin TSSOP
Value
Unit
160
124
°C/W
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°.
APW7037/A/B
Symbol
Parameter
Test Conditions
Unit
Min.
Typ.
Max.
FOSC=200KHz, CL=1500pF
2
3
5
mA
VC Dynamic Supply Current
FOSC=200KHz, CL=1500pF
2
5.5
8
mA
ICCQ
VCC Static Supply Current
SS=GND
0.5
1.5
3
mA
ICQ
VC Static Supply Current
SS=GND
0.2
0.4
1
mA
4.0
4.2
4.4
V
SUPPLY CURRENT
ICC
IC
VCC Dynamic Supply
Current
POWER-ON RESET
Rising VCC Threshold
VCC POR Hysteresis
0.25
Rising VC Threshold
3.1
VC POR Hysteresis
3.3
V
3.5
0.2
V
V
OSCILLATOR
FOSC
∆VOSC
Free Running Frequency
APW7037
180
200
220
APW7037A
360
400
440
APW7037B
180
200
220
Ramp Amplitude
KHz
1.10
V
ERROR AMPLIFIER
IFB1
FB Pin Input Bias Current
SS=3V, VFB=1V
1
nA
IFB2
FB Pin Input Bias Current
SS=0V, VFB=1V
-64
µA
GM
Transconductance
450
600
750
µmho
REFERENCE VOLTAGE
APW7037 1.225 1.250 1.275
VFB
FB Pin Regulation Voltage
APW7037A 0. 784 0. 800 0. 816
V
APW7037B 0.784 0.800 0.816
LREG
VFB Line Regulation
Copyright  ANPEC Electronics Corp.
Rev. A.6 - Apr, 2005
VCC = 5~12V
3
0.2
0.35
%
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APW7037/A/B
Electrical Characteristics (Cont.)
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
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
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
APW7037
0.4
0.6
0.8
APW7037A
0.3
0. 4
0. 5
APW7037B
0.3
0.4
0.5
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
0.5
10
20
V
V
30
µA
Functional Pin Description
FB (Pin 1)
Connect this pin to the output (VOUT) of the PWM converter via an external resistor divider to provide a voltage feedback path for the converter. The output voltage set by the resistor divider is determined using the
following formula :
R OUT
VOUT = VREF x ( 1+
)
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.
R GND
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.
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 UnderVoltage 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.
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.
SS (Pin 8)
Connect a capacitor from this pin to ground.This
capacitor, along with an internal 20uA current source,
sets the soft-start interval of the PWM converter and
prevents the outputs from overshoot as well as limits
the input current. Pull this pin below 0.5V can shutdown the converter.
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
Copyright  ANPEC Electronics Corp.
Rev. A.6 - Apr, 2005
4
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APW7037/A/B
Typical Applications
1. Dual supply voltage(5V and 12V) application
R4
3
V CC
Q2
A P M 2300A
8
C2
1uF
6
2
C1
1uF
+ 12V
C5
1uF
VC
SS
HDRV
U1
A P W 7037
C7
0.1uF
C3
47uF
V OU T
1.5V /5 A
Shutdown
Q 1B
A P M 7313
3
LDRV
7
V IN
+ 5V
L4
3.3uH
Q 1A
A P M 7313
5
C4
100uF
L3
1uH
C6,C9
2 x 150uF
CO M P
R3
24k
FB
G ND
R2
1.24k
4
C8
2200pF
R1
249
1
2. Single supply voltage(5V) application
R4
3
D1
1N4148
D3
1N4148
C1
1uF
6
2
V CC
C2
1uF
C6
1uF
VC
C5
100uF
L3
1uH
V IN
+ 5V
C4
47uF
C3
0.1uF
Q2
A P M 2300A
8
SS
H DR V
Shutdown
D2
1N4148
Q1A
A P M 7312
5
U1
A P W 7037
C8
0.1uF
V OU T
1.5V /5 A
Q1B
A P M 7312
3
7
L4
3.3uH
LD RV
C7,C10
2 x 150uF
CO M P
R3
24k
G ND
Copyright  ANPEC Electronics Corp.
Rev. A.6 - Apr, 2005
1
R2
1.24k
4
C9
2200pF
FB
R1
249
5
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APW7037/A/B
Typical Applications (Cont.)
3. LCD Monitor Application Circuit
R8 0
R4
3
E x tra Circ uit for V IN> 15V A pplic ation
C11
1uF
D2
1N4148
6
2
V CC
R5
18k
R7 1k
C12
0.1uF
U2
A P L431
R6
10k
D1
1N4148
C1
1uF
Q2
2N3904
C2
1uF
C6
1uF
VC
C5
470uF
L3
1uH
C4
47uF
V IN
9V ~ 22V
C3
0.1uF
8
SS
HDRV
C8
0.1uF
Q 1A
A P M 7313
5
U1
A P W 7037
R9
12
LDRV
CO M P
R10
12
R3
24k
G ND
Copyright  ANPEC Electronics Corp.
Rev. A.6 - Apr, 2005
C7,C10
2 x 470uF
R1
3k
1
R2
1k
4
C9
2200pF
FB
V OU T
5V / 0.2~ 5 A
Q 1B
A P M 7313
3
7
L4
50uH
6
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APW7037/A/B
Package Information
E
e1
0.015X45
SOP-8 pin ( Reference JEDEC Registration MS-012)
H
e2
D
A1
1
L
0.004max.
Dim
A
Mi ll im et er s
Inche s
A
Min.
1. 35
Max .
1. 75
Min.
0. 053
Max .
0. 069
A1
D
E
0. 10
4. 80
3. 80
0. 25
5. 00
4. 00
0. 004
0. 189
0. 150
0. 010
0. 197
0. 157
H
L
e1
e2
5. 80
0. 40
0. 33
6. 20
1. 27
0. 51
0. 228
0. 016
0. 013
0. 244
0. 050
0. 020
φ 1
Copyright  ANPEC Electronics Corp.
Rev. A.6 - Apr, 2005
1. 27B S C
0. 50B S C
8°
8°
7
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APW7037/A/B
Package Information
TSSOP-8
e
8 7
2x E/2
E1
( 2)
E
GAUGE
PLANE
S
1
2
e/2
0.25
D
L
A2
A
b
Dim
A
A1
A2
b
D
e
E
E1
L
L1
R
R1
S
φ1
φ2
φ3
1
(L1)
( 3)
A1
Millimeters
Min.
Inches
Max.
1.2
0.15
1.05
0.30
3.1
0.00
0.80
0.19
2.9
Min.
0.000
0.031
0.007
0.114
0.65 BSC
6.40 BSC
4.30
0.45
0.026 BSC
0.252 BSC
4.50
0.75
0.169
0.018
8°
0.004
0.004
0.008
0°
1.0 REF
0.09
0.09
0.2
0°
Copyright  ANPEC Electronics Corp.
Rev. A.6 - Apr, 2005
Max.
0.047
0.006
0.041
0.012
0.122
0.177
0.030
0.039REF
12° REF
12° REF
8°
12° REF
12° REF
8
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APW7037/A/B
Physical Specifications
Terminal Material
Lead Solderability
Solder-Plated Copper (Solder Material : 90/10 or 63/37 SnPb), 100%Sn
Meets EIA Specification RSI86-91, ANSI/J-STD-002 Category 3.
Reflow Condition
(IR/Convection or VPR Reflow)
tp
TP
C ritical Z one
T L to T P
T e m p e ra tu re
R am p-up
TL
tL
T sm ax
T sm in
R am p-down
ts
Preheat
25
t 25 °C to Peak
T im e
Classificatin Reflow Profiles
Profile Feature
Sn-Pb Eutectic Assembly
Large Body
Small Body
Average ramp-up rate
3°C/second max.
(TL to TP)
Preheat
- Temperature Min (Tsmin)
100°C
- Temperature Mix (Tsmax)
150°C
- Time (min to max)(ts)
60-120 seconds
Tsmax to TL
- Ramp-up Rate
Tsmax to TL
- Temperature(TL)
183°C
- Time (tL)
60-150 seconds
Peak Temperature(Tp)
225 +0/-5°C
240 +0/-5°C
Time within 5°C of actual Peak
10-30 seconds
10-30 seconds
Temperature(tp)
Ramp-down Rate
6°C/second max.
6 minutes max.
Time 25°C to Peak Temperature
Pb-Free Assembly
Large Body
Small Body
3°C/second max.
150°C
200°C
60-180 seconds
3°C/second max
217°C
60-150 seconds
245 +0/-5°C
250 +0/-5°C
10-30 seconds
20-40 seconds
6°C/second max.
8 minutes max.
Note: All temperatures refer to topside of the package. Measured on the body surface.
Copyright  ANPEC Electronics Corp.
Rev. A.6 - Apr, 2005
9
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APW7037/A/B
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 , Itr > 100mA
Carrier Tape & Reel Dimensions
t
D
P
Po
E
P1
Bo
F
W
Ko
Ao
D1
T2
J
C
A
B
T1
Application
SOP-8
A
B
330±1
62 ± 1.5
F
D
C
12.75
+0.15
D1
J
T1
T2
2 + 0.5
12.4 +0.2
2± 0.2
Po
P1
5.5 ± 0.1 1.55 ±+0.1 1.55+0.25 4.0 ± 0.1
Application
TSSOP-8
A
B
330 ± 1
F
P
E
8± 0.1
1.75± 0.1
Ao
W
12 + 0.3
- 0.1
Bo
Ko
t
2.0 ± 0.1
6.4 ± 0.1
5.2± 0.1
2.1± 0.1
0.3±0.013
J
T1
T2
W
P
E
62 +1.5
C
12.75+
0.15
2 + 0.5
12.4 ± 0.2
2 ± 0.2
12± 0. 3
8± 0.1
1.75±0.1
D
D1
Po
P1
Ao
Bo
Ko
t
1.5 + 0.1
4.0 ± 0.1
2.0 ± 0.1
7.0 ± 0.1
3.6 ± 0.3
5.5 ± 0. 1 1.5 + 0.1
1.6 ± 0.1 0.3±0.013
(mm)
Copyright  ANPEC Electronics Corp.
Rev. A.6 - Apr, 2005
10
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APW7037/A/B
Cover Tape Dimensions
Application
SOP- 8
TSSOP- 8
Carrier Width
12
12
Cover Tape Width
9.3
9.3
Devices Per Reel
2500
2500
Customer Service
Anpec Electronics Corp.
Head Office :
5F, No. 2 Li-Hsin Road, SBIP,
Hsin-Chu, Taiwan, R.O.C.
Tel : 886-3-5642000
Fax : 886-3-5642050
Taipei Branch :
7F, No. 137, Lane 235, Pac Chiao Rd.,
Hsin Tien City, Taipei Hsien, Taiwan, R. O. C.
Tel : 886-2-89191368
Fax : 886-2-89191369
Copyright  ANPEC Electronics Corp.
Rev. A.6 - Apr, 2005
11
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